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Archived Title 24, Part 6 CASE Reports

Statewide Codes and Standards Team
The Statewide Utility Codes and Standards Program actively supports code-setting bodies in developing and revising codes and standards through Codes and Standards Enhancement (CASE) initiatives. The Program’s intent is to achieve significant energy savings through the development of reasonable, responsible, and cost-effective code changes.

2005 Title 24, Part 6 Code Change

Nonresidential

Measure Name Measure Description
Time Dependent Valuation (TDV)- Economics Methodology The TDV economics proposal is a methodology for deriving hourly valuations for electricity, natural gas, and propane. Each set of values represents one class of buildings (residential, non residential), one of the three fuels, and one of the sixteen California climates.
 Code Change Proposal for Cooling Towers This proposal contains three provisions to enhance the performance of chilled water plants, and their treatment under Title 24. The first measure is a limitation on the use of air-cooled chillers in chilled water plants. The second measure addresses the design of cooling towers to accommodate variations in flow as chillers are staged on or off in multiple chiller plants. The third measure addresses the application of cooling towers with centrifugal fans.
Code Change Proposal for Updates to Title 24 Treatment of Skylights Six proposed changes to Title 24 are recommended to improve how the building efficiency standards are applied to skylights: (1) Modifying the description of the daylit zone under skylights; (2) Correcting errors in the definitions of effective aperture and well efficiency; (3) Adding requirements for Automatic Daylighting Control Devices so that they are easy to adjust initially and over time; (4) Adding a mandatory requirement that light fixtures in the daylit area be controlled by photosensors or timeclocks; (5) Revising the Power Adjustment Factors to give more credit to automatic stepped daylighting controls under skylights; (6) Updating the prescriptive requirements for large (greater than 25,000 square feet) low-rise nonresidential buildings to require skylights for floor areas directly under roofs.
 Code Change Proposal Bi-Level Lighting Control Credits  This code and standards enhancement initiative will encourage the use of occupancy sensors, timers and specialized switching strategies in conjunction with bi-level lighting controls in intermittently occupied areas. The three space types identified as eligible for Power Adjustment Factor’s are corridors, library and warehouse ‘stack’ areas, and small office spaces.
Code Change Proposal for High Performance Relocatable Classrooms This proposed measure will make modifications to current Relocatable Classroom (RC) Standards requirements for ceiling insulation, cool roofing and lighting, and develops a set of prescriptive envelope component measures that would apply to all relocatable classrooms built, sold, and leased in California, regardless of the climate zone where the RC would be located. In addition, RC’s will continue to be subject to the mandatory lighting controls, HVAC controls and other mandatory requirements applicable to all nonresidential buildings.
Code Change Proposal for Nonresidential Duct Sealing and Insulation This Code Change Proposal updates the treatment of duct systems in light commercial buildings. Duct insulation R-values are increased from R-4.2 to R-8 for ducts located in an unconditional space or outdoors.
Inclusion of Cool Roofs in Nonresidential Title 24 Prescriptive Requirements This proposal would modify the treatment of cool roofs (primarily roofs with high solar reflectance and high thermal emittance) in California’s Title-24 standards for non-residential (NR) buildings. Cool roofs will be considered a prescriptive requirement for NR buildings with low-sloped roofs (i.e., roofs with a ratio of rise to run not exceeding 2:12).


Residential

Measure Name Measure Description
Time Dependent Valuation (TDV)- Economics Methodology The TDV economics proposal is a methodology for deriving hourly valuations for electricity, natural gas, and propane. Each set of values represents one class of buildings (residential, non residential), one of the three fuels, and one of the sixteen California climates.
Window Efficiency Requirements Upon Window Replacement The proposed language removes the exemption for replacement fenestration products and clarifies that they are covered as alterations. Under modified language for alterations, replacement fenestration products would then have to meet labeling and prescriptive package requirements.
 Code Change Proposal for Multifamily Water Heating  The first standard is to establish a custom water heating budget methodology to represent central water heating systems for multifamily buildings. The second standard is to propose new modeling assumptions that better represent hot water distribution system losses and the impact of controls, insulation and other specific improvements to the systems.
Code Change Proposal for Residential Hardwired Lighting This code and standards enhancement initiative will reduce residential new construction lighting energy use by encouraging the use of high efficacy lighting, occupancy sensors and photosensors in high-use areas of the home and exterior. This initiative also addresses low compliance rates, enforcement confusion, and unpopularity of the current residential lighting requirements with designers and builders. This initiative will apply to residential single-family and multifamily low-rise and high-rise new construction.
Duct Sealing Requirements upon HVAC or Duct-System Replacement This Code Change Proposal encompasses two changes : 1) a requirement that duct systems be sealed and tested at the time that an air-conditioner, heat-pump, or furnace is installed in certain existing light commercial buildings, and 2) a requirement that new or replacement duct systems in that same class of buildings meet the same insulation levels as ducts in similarly designed new buildings (i.e. R-8), as well as be sealed and tested. The proposed requirements are triggered either by installation of a furnace, a packaged indoor/outdoor unit, or replacement or installation of an air handler, cooling or heating coil, or furnace heat exchanger, or by installation of a new or replacement duct system in an existing structure.
Code Change Proposal for Hourly Water Heating Calculations This proposed code change will modify the calculation procedure for estimating water heating energy so that it produces results on an hourly basis, which is consistent with TDV. The change requires that a custom budget approach be used to develop the water heating budget.
 Code Change Proposal Bi-Level Lighting Control Credits  This code and standards enhancement initiative will encourage the use of occupancy sensors, timers and specialized switching strategies in conjunction with bi-level lighting controls in intermittently occupied areas. The three space types identified as eligible for Power Adjustment Factor’s are corridors, library and warehouse ‘stack’ areas, and small office spaces.
Gas Cooling Compliance Options for Residential and Non-Residential Buildings The proposed change modifies standards and ACM Approval Manual language to explicitly include gas cooling as a compliance option. The change affects all building types covered by the residential and non-residential sections of the California Building Energy Efficiency Standards, and would most likely be applicable to commercial and single family residential occupancies.
Duct Sealing Requirements upon HVAC or Duct-System Replacement: Light Commercial Buildings This Code Change Proposal encompasses two changes: (1) a requirement that duct systems be sealed and tested at the time that an air-conditioner, heat-pump, or furnace is replaced or installed in an existing building; (2) a requirement that new or replacement duct systems in existing buildings have an insulation level of R-8 as well as be sealed and tested.

2008 Title 24, Part 6 Code Change

Nonresidential

Draft Report Demand Responsive Control of Air Conditioning via Programmable Communicating Thermostats (PCTs) This proposal requires that all temperature control of all new spaces and all spaces served by a retrofit HVAC system would include the capability to receive a curtailment signal from the local utility or Independent System Operator (ISO) and be able to set-up the cooling setpoint while receiving the curtailment signal. These code language changes would place the communicating nature of temperature controls on the same footing as the requirement for thermostats to be programmable.
Hardwired Standby Loads: Lighting Controls This proposal addresses the standby energy loads from hardwired lighting controls- specifically sensors that regulate usage of non-residential and high-rise residential lighting fixtures and systems. The lighting controls and sensors evaluated in this CASE study are used for smaller, defined commercial spaces such as hallways, rest rooms, conference rooms, storage rooms, copy rooms, open office areas, and private offices, as well as outdoor building perimeter lighting.
July 13th, 2006 Workshop Report DDC to the Zone Level 1: VAV Zone Minimums  This report addresses one of five separate measures that extend the control requirements of the standard. This specific report covers the Variable Air Volume (VAV) Zone Minimums. This initiative does not seek to require installation of DDC to the zone level, rather it extends the current philosophy of the prescriptive requirements.
July 13th, 2006 Workshop Report DDC to the Zone Level Measure 4: Demand Control Ventilation (DCV)  This report addresses one of five separate measures that extend the control requirements of the standard. This specific report covers the revisions to demand control ventilation (DCV). This initiative does not seek to require installation of DDC to the zone level, rather it extends the current philosophy of the prescriptive requirements.
Measure Information Template: Residential Evaporative Cooling  This proposal contains changes in how evaporative coolers are modeled under the Title 24 Residential Building Standards. Updated ACM rules and eligibility criteria are needed to provide a viable framework for evaluating evaporative coolers within Title 24.
Measure Information Template- Residential Swimming Pools This report describes the economic, technical, cost-effectiveness and feasibility issues associated with a Title 24 energy code requirement that would mandate various design and operational aspects of new California swimming pools. The proposed measures will establish the minimum acceptable pool design for increased energy efficiency while maintaining safety standards.
Building Envelope Tradeoff Method  The building envelope tradeoff method contained in Section 143(b) contains a building envelope tradeoff procedure
whereby fenestration performance, insulation levels and cool roof properties may be traded off to achieve compliance with the standards. This proposal would also introduce a new coefficient for visual light transmittance in order to better model the different solar heat gain performance between single and multiple layered glazing.
Draft Report Insulation Requirements  The proposed change is a modification to the prescriptive insulation requirements for nonresidential buildings,
which are contained in Tables 143-A, 143-B, and 143-C. The standards for relocatable school buildings in Table
143-C are for buildings that can be relocated to any climate zone, and so the insulation requirements correspond to
those of the most severe climate zones in Table 143-A.
Draft Report Outdoor Lighting  The major change for this CASE proposal is the revision of Table 147-A “Lighting Power Allowances for General
Site Illumination” and Table 147-B “Lighting Power Allowances for Specific Applications”. In both cases, LPD’s
(lighting power densities) will be reduced where appropriate.
Draft Report Refrigerated Warehouses  The proposed changes to Title 24 affect the building shell insulation levels, evaporator fan controls, condenser sizing and control strategies, compressor plant controls and interior lighting levels for refrigerated warehouses. The equipment-related changes deal only with the storage part of the facility; standards for pre-coolers or other clearly process related equipment were not addressed.
Draft Report Requirements for Signs  This CASE proposal addresses the energy savings opportunities available in outdoor signs. The key elements of the proposal are as follows: turn off lights in signs when no one is around; the amount of light needed to see an unfiltered sign during the day is substantially greater than that needed at night; using high efficiency power supplies for neon and cold cathode sources in accordance with temperature limitations of the technology; using electronic high efficiency power supplies for LED signs; dimming loads or turning off a fraction of the load for a few hours per year.
Inclusion of Solar Reflectance and Thermal Emittance Prescriptive Requirements for Steep-Sloped Nonresidential Roofs in Title 24  This report proposes adding prescriptive requirements for the solar reflectance and thermal emittance of roofs to California’s Title-24 standards for nonresidential buildings with steep-sloped roofs. The proposed measure advocates minimum requirements for the solar reflectance and thermal emittance of roofs to reduce cooling energy usage and peak electrical power demand in air-conditioned buildings regulated by Title 24.
Draft Report TDV (Time Dependent Valuation) Lighting Controls Schedules  This code and standards enhancement initiative will encourage the use of the existing capabilities of the California Energy Commission approved energy simulation tools for modeling lighting controls in line with the TDV regimen.
Draft Report: Demand Responsive Building Plan  This report describes the economic, technical, cost-effectiveness and feasibility issues associated with a requirement for prioritizing the demand response (DR) of building loads for nonresidential buildings in the Title 24 standards. This proposal involves two levels of requirements, one for all commercial buildings greater than 5,000 square feet and an additional requirement for very large commercial buildings, those greater than 100,000 square feet.
Draft Report: Demand Responsive Controls for Indoor Lighting  The proposal recommends a mandatory requirement for demand responsive controls in spaces greater than 100,000 square feet such as office buildings, malls, and theaters. The controls would receive two types of signals from the local utility: an economic response signal which indicates the cost of electricity on a regular basis and an emergency curtailment signal which indicates that the reserve capacity in the region is extremely low.
Draft Report: Updates to Skylighting Requirements  The upgrades to the skylighting requirements are minimum space size that triggers requirements for skylighting, daylit area under skylights, photocontrols required in the skylight area under skylights, lighting control credits allowed only when total daylit area in an enclosed space is less than 2,500 square feet, lighting control credits updated, exempt multi-level requirement for daylighting controls when LPD is lower than 0.5 W/square feet, single level controls for skylight retrofits, requirement for a deadband adjustment, clarify area controls and multi-level switching requirements, update the skylight U-factor and SHGC requirements to match default skylight properties.
July 13th, 2006 Workshop Report DDC to the Zone Level 2: Demand Shed Controls  This report addresses one of five separate measures that extend the control requirements of the standard. This specific report covers the global demand shed controls. This initiative does not seek to require installation of DDC to the zone level, rather it extends the current philosophy of the prescriptive requirements.
July 13th, 2006 Workshop Report DDC to the Zone Level 3: Hydronic Pressure Reset  This report addresses one of five separate measures that extend the control requirements of the standard. This specific report covers the reset of hydronic pressure by zone demand. This initiative does not seek to require installation of DDC to the zone level, rather it extends the current philosophy of the prescriptive requirements.
July 13th, 2006 Workshop Report DDC to the Zone Level Measure 5: Supply Air Temperature Reset  This report addresses one of five separate measures that extend the control requirements of the standard. This specific report covers measure 5, supply air temperature reset controls. This initiative does not seek to require installation of DDC to the zone level, rather it extends the current philosophy of the prescriptive requirements.

Residential

Draft Report Demand Responsive Control of Air Conditioning via Programmable Communicating Thermostats (PCTs) This proposal requires that all temperature control of all new spaces and all spaces served by a retrofit HVAC system would include the capability to receive a curtailment signal from the local utility or Independent System Operator (ISO) and be able to set-up the cooling setpoint while receiving the curtailment signal. These code language changes would place the communicating nature of temperature controls on the same footing as the requirement for thermostats to be programmable.
Hardwired Standby Loads: Lighting Controls This proposal addresses the standby energy loads from hardwired lighting controls- specifically sensors that regulate usage of non-residential and high-rise residential lighting fixtures and systems. The lighting controls and sensors evaluated in this CASE study are used for smaller, defined commercial spaces such as hallways, rest rooms, conference rooms, storage rooms, copy rooms, open office areas, and private offices, as well as outdoor building perimeter lighting.
Measure Information Template: Residential Evaporative Cooling This proposal contains changes in how evaporative coolers are modeled under the Title 24 Residential Building Standards. Updated ACM rules and eligibility criteria are needed to provide a viable framework for evaluating evaporative coolers within Title 24.
Measure Information Template- Residential Swimming Pools  This report describes the economic, technical, cost-effectiveness and feasibility issues associated with a Title 24 energy code requirement that would mandate various design and operational aspects of new California swimming pools. The proposed measures will establish the minimum acceptable pool design for increased energy efficiency while maintaining safety standards.
 CASE Study for Residential Windows  The intent of this CASE study is to evaluate possible changes to the prescriptive U- factor and Solar Heat Gain Coefficient (SHGC) for residential fenestration products, to consider various measures and their energy and economic impacts, and to propose appropriate values for incorporation into the 2008 Energy Standards.

2013 Title 24, Part 6 Code Change

Nonresidential

Measure Name Measure Description
Acceptance Requirements #1: Effectiveness and Compliance (Based on PIER Study) This proposed code change would revise the standards, instructions and compliance forms for ten of the existing acceptance tests for the Energy Efficiency Standards for Nonresidential Buildings (Part 6, Title 24): NA7.5.1 Outdoor Air, NA7.5.2 Constant Volume Single Zone Unitary Air Conditioner and Heat Pump Systems, NA7.5.3 Air Distribution Systems, NA7.5.4 Air Economizer Controls, NA7.5.6 Supply Fan Variable Flow Controls, NA7.5.8 Supply Water Temperature Reset Controls, NA7.5.9 Hydronic System Variable Flow Controls, NA7.6.1 Automatic Daylighting Control, NA7.6.3 Manual Daylighting Control, and NA7.6.4 Automatic Time Switch Control.
Acceptance Requirements #2: Based on Retro-commissioning Failure Modes This measure proposes new or revised acceptance tests or acceptance testing procedures for the Energy Efficiency Standards for Nonresidential Buildings (Part 6, Title 24).
Automated Lighting Controls and Switching Requirements in Warehouses and Libraries The proposed measure is to require the installation of occupancy sensors in warehouse aisle ways and open spaces, and library stack aisles throughout California. The occupancy sensors are to be configured to switch off at least one-half of the installed lighting wattage, and to be in accordance with Section 119 the occupancy sensor time delay should be no longer than 30 minutes.
Commercial Boilers This paper presents three proposals that affect certain sizes of new boilers that serve commercial buildings. The first measure, combustion air positive shut off, would apply to new, natural draft (atmospheric) boilers. The second measure is variable frequency drive (VFD) on the combustion air fan. The third measure is parallel position control.
Compressed Air Systems The proposed code change would require all new industrial plants’ compressed air systems to include at least one trim compressor that performs efficiently in part load conditions and primary storage, both sized appropriately to meet the minimum trim needs of any other compressors in the system.
Control of Egress Lighting This CASE report proposes two possible levels of shut-off during unoccupied periods: Level One, in which the emergency lighting remains on while the building is unoccupied, using no more than 0.05 W/sf and providing 1fc average illumination along the exist path. Level Two, in which the emergency lighting is also shut off, to save additional energy during unoccupied periods.
Cooling Tower Water Savings This measure would apply to evaporative cooling towers 150 tons and larger, installed in new construction and replacement projects for commercial/ industrial/ institutional buildings covered under Title 24. Building types/ sectors most likely to be affected include those that have a cooling tower used for rejecting heat from an HVAC system (e.g., office building) or used for rejecting heat from process loads (e.g., manufacturing, food processing, etc.).
Draft Measure Information Template – Design-Phase Commissioning The proposed measure, applicable to all non-residential buildings, adds to the code requirements a Design Review process that is completed in two parts: an initial Design Review Kickoff and completion of a construction document Design Review checklist.
Evaporative Cooling System Compliance Credit This measure provides compliance credits for high-efficiency hybrid evaporative cooling system types in the performance method for compliance with code. The change would add or modify a new measure to the list of existing compliance options for meeting the Standards using the performance approach.
Fan Control and Integrated Economizers This measure extends the current Single Zone VAV requirement (144(l)) from 10 tons down to 6 tons for DX equipment (starting 1/1/2015) and down to ¼ HP for chilled water equipment. It also clarifies the definition of an integrated economizer: Systems that require an economizer must be able to modulate cooling capacity (e.g. compressor output) down to 20% or less of total capacity.
Final Measure Information Template – Laboratory Exhaust VAV and Reheat This measure would apply to laboratory supply and exhaust air systems in California.
Guest Room Occupancy Controls The proposed measure would require installation of occupancy controls for HVAC equipment, and all lighting fixtures in hotel/motel guest rooms, including plug-in lighting. Examples of occupancy controls include captive card key controls and
sensor-based controls.
Hydronic Low Temperature Radiant Cooling Systems This measure provides an optional HVAC system type in the Nonresidential Alternative Calculation Method (ACM) for hydronic floor-based radiant cooling systems. The change would modify the calculation procedures or assumptions used in making performance calculations when using radiant cooling systems in the proposed building.
Indoor Lighting – Retail Proposed changes to Title 24 for improvements to the lighting component of building efficiency standards as applied to nonresidential buildings, and retail spaces in particular, using the Tailored Method of compliance are: reduce the allowed LPD for Floor Display, Wall Display and Ornamental Lighting under the Tailored Compliance based on increased use of Ceramic Metal Halide (CMH); significantly reduce the space types allowed under the Tailored Method of compliance.
Kitchen Ventilation This measure describes four energy saving measures associated with commercial kitchen ventilation. The four propose measures shall address: 1. Direct Replacement of Exhaust Air Limitations, 2. Type I Exhaust Hood Airflow Limitations, 3. Makeup and Transfer Air Requirements, 4. Commercial Kitchen System Efficiency Options.
Light Commercial Unitary HVAC This document describes a number of proposed changes to Title 24 that affect controls and economizers. A proposal is to advance parts of the Fault Detection and Diagnostics (FDD) as a prescriptive baseline to detect the following faults: air temperature sensor failure/fault, not economizing when it should, economizing when it should not, damper not modulating, and excess outdoor air.
Lighting Alterations and Modifications in Place Non-residential spaces in which 10% or more of the luminaires or ballasts are replaced would be required to comply with the same requirements as new construction, in terms of lighting power densities and lighting controls. There is a proposed exception such that lighting controls do not have to be installed in spaces that have asbestos in the ceiling.
Lighting in Multifamily and Hotel Corridors The proposed measure is to require the installation of occupancy sensors in corridors and stairwells in lodging and multifamily buildings throughout California. The occupancy sensors are to be configured to switch off at least one-half of the installed lighting wattage, and to be in accordance with Section 119 the occupancy sensor time delay should be no more than 30 minutes.
Measure Information Template- Indoor Lighting Controls The intention of this code change proposal is to reduce the lighting energy used in offices (open, private and overall). The approach that we have taken is to reduce lighting power densities to the extent possible, and to facilitate the achievement of these reduced LPDs, in part, through a Power Adjustment Factor (PAF) for occupancy controls in open offices.
Nonresidential & High-Rise Residential Fenestration Requirements The proposed update would change the required NFRC2 performance ratings for nonresidential and high-rise residential buildings.
Nonresidential Cool Roofs This proposal would raise the prescriptive reflectance requirement for nonresidential low-sloped cool roofs from Raged = 0.55 to Raged = 0.67. Climate zones 1 and 16 would now have a reflectance standard, also at Raged = 0.67 in climate zones 2-15. For high-rise residential, hotel, and motel occupancies, the reflectance standard would be set at Raged = 0.67 as well; those occupancies would continue to not have a reflectance standard in climate zones 1 and 16.
Nonresidential Daylighting Four code changes are being proposed as part of this report that increase stringency of daylight code requirements, resulting in greater energy savings, and simplify the daylighting code implementation process, removing key barriers to code compliance for greater and more widespread use. The proposed code changes apply to all nonresidential, high-rise residential and hotel/motel occupancies.
Nonresidential Demand Responsive Lighting Controls This report investigates the feasibility and cost-effectiveness of requiring automated demand responsive controls on commercial indoor lighting loads. This demand responsive control would enable users to control their electricity costs during highest cost periods by automatically reducing their lighting electricity consumption upon receipt of a demand response signal.
Nonresidential Solar-ready Buildings The nonresidential solar-ready buildings measure would require new low-rise nonresidential buildings to be designed such that it will be technically feasible to install, at a future date, a photovoltaic (PV) or solar water heating (SWH) system of the size specified in the code. The solar-ready requirements would apply for major retrofits if the retrofit would increase the total roof area by more than 20 percent.
Outdoor Lighting and Controls The revisions in this measure detail two distinct points of effort. The changing IESNA design guidelines for some exterior lighting situations provides an opportunity to reduce the LPD’s associated with these conditions. The second revision involves the application of motion sensors in exterior lighting situations where the lighting equipment is mounted below 24’.
Outside Air This measure eliminates the option to field calibrate CO2 sensors used in demand control ventilation systems. Instead, certificate of factory calibration would be required for all CO2 sensors.
Parking Garage Lighting and Controls This measure will require the employment of sensors (with some limitation) in all parking garage spaces. Further, daylighting controls are required for defined daylight zones.
Plug Load Circuit Controls This proposal investigates the feasibility and cost-effectiveness of requiring automatic shut-off controls of electric circuits that serve plug loads, including task lightings, in office buildings. These controls enable connected task lights and plug loads to be automatically switched off when they are not in use.
Process Boilers This paper presents four proposals that affect certain sizes of new boilers that serve process loads: combustion air positive shut off, combustion fan variable frequency drive (VFD), parallel position control, and oxygen trim control.
Reduce Reheat This measure would require that in the heating portion of the dual maximum sequence for a VAV box, the zone supply air temperature goes up to the maximum setpoint before the zone airflow rate is increased. This intent of this change, therefore, is to prescriptively prohibit the simultaneous flow/temperature sequence.
Refrigerated Warehouse The proposed changes to Title 24 apply to Section 126 – Mandatory Requirements for Refrigerated Warehouses. The proposed changes are as follows: Freezer Roof Insulation, Freezer Floor Insulation, Evaporator Fan Control for Single Compressor Systems, Screw Compressor Part-Load Performance, Allow Air-Cooled Ammonia Condensers, Condenser Specific Efficiency, Infiltration Barriers, and Acceptance Tests.
Requirements for Controllable Lighting This proposed measure modifies the minimum requirements in Section 131 for multi-level lighting controls in non-residential buildings. The measure requires additional control steps beyond the existing requirements, specified according to light source. The measure also reduces the maximum lighting power density that is exempt from multi-level control.
Supermarket Refrigeration Title 24 Part 6 Measures: Floating head pressure – require controls to float refrigeration system saturated condensing temperature (SCT) to 70°F during low-ambient temperature conditions, with ambient-following control logic and variable speed condenser fans. Title 24 Part 11 (Reach) Code Measures CO2 secondary (indirect) or cascade cooling – require that refrigerated display cases and walk-in coolers and freezers utilize carbon dioxide (CO2) as the heat-transfer fluid or as the low-side refrigerant in a cascaded system to reduce HFC refrigerant charge.
Upgradeable Setback Thermostats This measure proposes changing the requirements for setback thermostats in Section 112(c) to require Upgradeable Setback Thermostats (USTs). This measure examines the feasibility of requiring all setback thermostats installed in new construction in the residential and nonresidential sectors to be capable of adding, or enabling, a communication device that would enable demand response.
Water and Space Heating ACM Improvement This CASE addresses several issues related to space heating and DHW systems: improved central DHW ACM algorithms that can assess energy savings from recirculation loop controls and plumbing design optimization; potential improvement of ACM algorithms for hydronic heating systems; standard design assumptions of air distribution ducts in multi-family buildings, minimum efficiency requirements for wall furnaces and space heating boilers, improvement of mandatory pipe insulation requirements and expansion of mandatory pipe insulation requirements to unconditioned buildings.

Residential

Measure Name Measure Description
 Advanced Envelope Assemblies 1- Sept 2011 This measure includes compliance options for three building envelope assembly types: Advanced Wood Framing (AWF), Insulating Concrete Forms (ICFs), and Structural Insulated Panels (SIPs). This measure is applicable to single family new residential construction.
Advanced Envelope Assemblies 2- Sept 2011 This measure includes compliance options for three building envelope assembly types: Advanced Wood Framing (AWF), Insulating Concrete Forms (ICFs), and Structural Insulated Panels (SIPs). This measure is applicable to single family new residential construction.
Garage Exhaust The proposed measure would require modulating ventilation airflow in large enclosed parking garages based on pollutant concentrations. By modulating airflow based on need rather than running constant volume, the system will save energy and maintain a safe environment.
Guest Room Occupancy Controls The proposed measure would require installation of occupancy controls for HVAC equipment, and all lighting fixtures in hotel/motel guest rooms, including plug-in lighting. Examples of occupancy controls include captive card key controls and
sensor-based controls.
High-efficiency Water Heater Ready This CASE study proposes that new construction homes shall be equipped with the following water heater supporting components to help reduce future water heater upgrade costs and to encourage installation of HE water heaters.
Increased Wall Insulation- Sept 2011 The proposed measure will apply new prescriptive wall insulation requirements to all new low-rise residential buildings in all climate zones. (Sept. 2011).
Increased Wall Insulation- Oct 2011 The proposed measure will apply new prescriptive wall insulation requirements to all new low-rise residential buildings in all climate zones. (Oct. 2011).
Multifamily Central DHW and Solar Water Heating This proposal adds the prescriptive requirement on DHW system with recirculation loops serving multiple dwellings to have (at least) two separate recirculation loops, each serving a portion of the building.
Multi-Head Showers and Lower-Flow Shower Heads The proposed measure would require shower heads installed in new construction in California to have a maximum rated flow rate at 80psi of less than or equal to 2.0 gallons per minute (gpm), and would make multi-head showers non-compliant with code unless the total flow rate from all heads at any given time were less than or equal to 2.0gpm. The proposed measure would also require showers to have only one shower head, unless that shower is large enough to require two heads (spacing between heads must be at least four feet).
Night Ventilation Cooling Compliance Option This compliance option proposal presents savings estimates and a methodology for obtaining Title 24 compliance credits for whole house fans (WHFs) and central fan integrated night ventilation cooling systems. Both system types can effectively shift cooling energy use from on-peak hours to off-peak hours.
Nonresidential & High-Rise Residential Fenestration Requirements The proposed update would change the required NFRC2 performance ratings for nonresidential and high-rise residential buildings.
Residential Ducts- Duct Sealing, Cooling Coil Airflow, Fan Watt Draw, and Measured Static Pressure Newly constructed residential buildings with ducted heating and cooling systems in all climate zones would have mandatory minimum cooling coil airflow and fan watt draw requirements with two options available for compliance. Option 1: the return duct(s) and return grill(s) must be sized according to the Return System Sizing Table. Option 2: the cooling coil air flow and fan watt draw must meet minimum measured values with HERS verification.
Residential Lighting The proposed changes apply to interior lighting of single-family residences, and the residential units of multifamily buildings. The proposed changes modify the mandatory requirements of the “Base Code” (Title 24 Part 6) and create new prescriptive requirements in the “Reach Code” (Title 24 Part 11).
Residential Plug-load Controls This measure provides an extra circuit that would enable residents to control the loss of energy due to appliance standby modes during periods of time throughout the day when no appliances on that circuit are being used. This report investigates the feasibility and cost-effectiveness of requiring installation of an additional electrical circuit in all residential new construction dedicated to controlling the main household electric power (mains) to a number of wall receptacles (outlets) throughout the residence.
Residential Refrigerant Charge Testing and Related Issues This CASE topic proposes changes to the methods of verifying correct charge and proper air conditioner system operation for residential split systems for space cooling. These changes allow additional procedures to conduct testing under low outside air temperatures, they modify criteria for testing with the subcooling method, they eliminate the temperature split qualification method, and they propose a new charge method for systems with microchannel condenser coils.
Residential Roof Envelope Measures This measure would increase the stringency of building envelope requirements by requiring additional insulation at the roof deck, a higher solar reflectance cool roof, and for some climate zones a raised heel truss to allow the full depth of insulation to be installed out to the top plate. A second related measure is to prescriptively require ducts in conditioned space as an alternative to the above. A third related measure is a provision for unvented attics as a compliance option.
Residential Window Efficiency This CASE report proposes revisions to the fenestration requirements in the residential Prescriptive Packages C, D, and E. Code language revisions detailed in Sections 5.1, 5.2, 5.3, and 5.4.
Residential Zoned Ducted HVAC Systems A mandatory requirement in the Low Rise Residential Standards for new single family homes and existing homes undergoing HVAC alterations or replacement to ensure the efficient functioning of air conditioners, furnaces, and heat pumps that employ ducted zoned systems.
Single Family Water Heating Distribution System Improvements This proposal utilizes new field information and more advanced evaluation tools to generate new prescriptive and mandatory requirements affecting single family water heating. ACM modifications are proposed to bring projected annual DHW energy usage closer in line to RASS data, and to update the distribution system multipliers for alternative distribution systems.
Solar Ready Homes and Solar Oriented Development The Solar Ready Homes measure would require single family homes to designate a“solar zone” on the roof reserved for future photovoltaic (PV) and solar water heating (SWH) systems. The solar zone would have a minimum area and orientation requirement, be kept free from vents and other protrusions and be unshaded.
Solar Water Heating – Residential and Specialty Commercial This proposed measure increases the prescriptive required minimum fraction of water heat to be provided by solar water heating systems for individual dwelling units (i.e. single-family housing) with electric resistance (storage and instantaneous) water heaters using Package C. The solar fraction required will be equal across climate zones, at 0.7.
Upgradeable Setback Thermostats This measure proposes changing the requirements for setback thermostats in Section 112(c) to require Upgradeable Setback Thermostats (USTs). This measure examines the feasibility of requiring all setback thermostats installed in new construction in the residential and nonresidential sectors to be capable of adding, or enabling, a communication device that would enable demand response.
Water and Space Heating ACM Improvement This CASE addresses several issues related to space heating and DHW systems: improved central DHW ACM algorithms that can assess energy savings from recirculation loop controls and plumbing design optimization; potential improvement of ACM algorithms for hydronic heating systems; standard design assumptions of air distribution ducts in multi-family buildings, minimum efficiency requirements for wall furnaces and space heating boilers, improvement of mandatory pipe insulation requirements and expansion of mandatory pipe insulation requirements to unconditioned buildings.

 

2016 Title 24, Part 6 Code Change

Nonresidential

Measure Name Measure Description
HVAC Equipment Efficiencey Based on ASHRAE 90.1-2013 The purpose of this measure is to update mandatory efficiency requirements for space conditioning equipment that appear in Tables 110.2-A thru K so the minimum equipment efficiency values are as stringent as the minimum efficiency requirements in ASHRAE 90.12013. This proposal would also add minimum efficiency requirements for the following equipment that is not previously covered by Title 24: propeller or axial fan evaporative condensers and centrifugal fan evaporative condensers.
Proposals Based on ASHRAE 90.1-2013 The proposed Elevator Ventilation and Cab Lighting measure would update Title 24 so the California standards are at least as stringent as the standards in ASHRAE 90.1-2013 Section 10.4.3. The Escalator and Moving Walkway Speed Control measure would require escalators and moving walkways to automatically slow down to the minimum permitted speed. The Operable Window/Door Switch measure is to prevent unnecessary use of energy for heating or cooling of additional un-tempered air if an operable window or door is left open outside of times when it is beneficial to leave it open.
Nonresidential Opaque Envelope The proposed measure would revise the prescriptive opaque envelope requirements for all nonresidential and high-rise residential buildings. These requirements would also provide the baseline requirements for the standard design building in the performance method.
Nonresidential Economizer Modifications  The 2013 Title 24 prescriptively requires that economizers be installed on air-cooled unitary direct-expansion units with cooling capacity equal to or greater than 54,000 Btu/h. A mandatory control requirement for these economizers is a Fault Detection and Diagnostic (FDD) system that meets a list of requirements in section 120.2(i).
Thermally Driven Cooling This code change proposal would add a new compliance option for applicants that wish to comply with Title 24 through the performance approach. The change affects new construction or major retrofits in nonresidential buildings or high-rise residential buildings that use thermally driven cooling in which the cooling effect is driven by heat rather than mechanical compressors.
Nonresidential Lighting: Indoor LPDs The Nonresidential Indoor LPDs measure is intended to revise the lighting power allowances assigned in Tables 140.6-B, 140.6-C, 140.6-D, and 140.6-G to adjust the values to be comparable in energy efficiency to the levels presented in ASHRAE 90.1-2013 if they prove to be cost effective.
Nonresidential Outdoor Lighting Power Allowance The Nonresidential Outdoor LPA measure intends to replace pulse start Metal Halide (PSMH) light sources with LED as the basis for the calculation of Lighting Power Allowances (LPA) for all exterior applications where it is technically feasible to do so.
Outdoor Lighting Controls (Including Bi-level controls) The Outdoor Lighting Controls measure is intended to modify current code language to make existing controls requirements more streamlined by removing the current exceptions from the controls requirements in Section 130.2(c), for Outdoor Sales Lots and Outdoor Sales Canopies.
Nonresidential Lighting Controls Clarification1
Minimum Skylight Area1

 

Residential

Measure Name Measure Description
 Residential Instantaneous Water Heaters This report complies with Title 24 Standards, an applicant must implement all mandatory requirements in the Standards. In addition to implementing the mandatory measures, the applicant must choose to either (1) implement a discrete set of additional measures, as defined in the prescriptive requirements (i.e. prescriptive approach), or (2) confirm that the building’s energy performance meets the required energy budget, as modeled using CEC-approved modeling software (i.e. performance approach).
 Residential Instantaneous Water Heaters Addendum This is an addendum to the Title 24 Residential Instantaneous Water Heaters (IWH) CASE Report. The addendum contains additional information on the proposed standards for residential water heating in new construction and additions, as requested by CEC staff in October and November 2014.
 Residential Ducts in Conditioned Space / High Performance Attics This measure consists of two alternatives: to improve building thermal envelope and reduced HVAC distribution losses in residential buildings. DCS will require that ducts and equipment be located within the thermal and air boundary of the building. High Performance Attics (HPA) is a package of measures that minimizes the temperature difference between the attic and the conditioned air in ducts.
 Residential High Performance Walls This measure is intended to increase the performance of the residential envelope, reducing the amount of heat transfer through walls and thus reduce HVAC loads.
 Residential HVAC Verification and Diagnostics This report provides detailed information about the code change proposal including: Section 2.2 Summary of Changes to Code Documents provides a sectionby-section description of the proposed changes to the standards, appendices, alternative compliance manual and other documents that will be modified by the proposed code change. Detailed proposed changes to the text of the building efficiency standards and the reference appendices are given in Section 6 Proposed Language of this report.
 Residential Lighting This proposal would update Section 150.0(k) to require the use of high efficacy lighting in all residential new construction applications and eliminate exceptions which allow low efficacy lighting in combination with controls. The mandatory controls continue to require vacancy sensors in utility rooms, laundry rooms, and garages, as required by the current Standards and add a requirement that at least one bathroom luminaire be controlled by a vacancy sensor.
 Plug Loads and Lighting Modeling This CASE Report proposes updated rulesets to use in the Title 24 residential compliance software to estimate annual energy use of plug loads and lighting in residential buildings. Plug loads are defined as appliances or electronic devices that are generally plugged into a receptacle, such as white goods, consumer electronics, and other miscellaneous electric loads (MELs); lighting includes all portable and hardwired interior, exterior, and garage lighting.

 

California Statewide Utility Codes and Standards Program

This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.