Mechanical

Related Measures

• Analysis of Duct Insulation Requirements for Ducts in Conditioned and Indirectly Conditioned Spaces

  This report describes a study of issues associated with running uninsulated ductwork through conditioned spaces in houses.

• Evaluation of Test Procedures for Whole House Fan Airflow Measurement

  The Statewide CASE team conducted a field study of five WHF installations and developed a report to evaluate a New Attic Pressure Matching Procedure and reevaluate the Existing Blower Door Pressure Matching Procedure.

• Multifamily Chapter Restructuring

  The Statewide CASE Team proposes additional chapters for Title 24, Part 6, specific to multifamily buildings.

• Nonresidential Drain Water Heat Recovery

  This measure would prescriptively require drain water heat recovery (DWHR) in nonresidential buildings types that are found to be cost-effective, as well as add DWHR as a compliance option for all nonresidential buildings. This CASE topic builds on a DWHR measure for low-rise residential in Title 24 2019 as a compliance credit and an alternative prescriptive path for gas storage water heaters, heat pump water heaters, and solar water-heating systems.

• Single Family Variable Capacity HVAC Compliance Software Revisions

  This CASE Report will de-rate the performance of variable speed HVAC systems unless ducts are located inside conditioned or partially conditioned space (such as a high-performance attic). Variable capacity split system air conditioners and heat pumps (as distinguished from mini-split heat pumps) typically have significantly higher SEER and EER ratings than single speed equipment.

• Multifamily Indoor Air Quality

  This CASE Report will investigate the options to reduce energy use and improve indoor air quality (IAQ) in multifamily dwelling units. It will also evaluate the cost-effectiveness and feasibility of a mandatory compartmentalization air leakage requirement and develop a path for a multifamily building to conduct an infiltration test verified by HERS blower door testing on a sample of multifamily units per building or per floor.

• Multifamily Domestic Hot Water

  This CASE Report for multifamily domestic water heating will include three submeasures: central heat pump water heating, hot water distribution, and solar thermal water heating.

• Multifamily All Electric Package

  This CASE Report will develop a prescriptive pathway and compliance option for all-electric multifamily buildings that use electric appliances for all regulated and non-regulated end uses. This topic builds on the 2019 prescriptive requirements for low-rise residential buildings that allow heat pump water heating (individual water heaters) and space heating.

• Nonresidential HVAC Controls

  This CASE Report will further expand on economizer requirements as one submeasure and will include two additional HVAC submeasures related to HVAC controls. In total, this CASE Report will include three submeasures as described below.

• Nonresidential High Efficiency Boilers and Service Water Heating

  This CASE Report will include two submeasures: high efficiency boiler systems and high efficiency service water heating equipment systems. Specifically, these submeasures will update the boiler efficiency and service water heating system requirements to harmonize with the requirements proposed for Addendum BC to ASHRAE Standard 90.1-2016 and section 7.5.3 of ASHRAE Standard 90.1-2016 respectively.

• Single Family Enhanced Air-to-Water Heat Pump Compliance Options

  This CASE Report will evaluate the existing residential Alternative Calculation Method modeling approach for air-to-water heat pumps and to utilize recently available field data to better characterize performance and accommodate emerging strategies for these products.

• Nonresidential Computer Room Efficiency

  The data center efficiency CASE Report will improve energy performance of data centers by pursuing the package of code change proposals listed below.

• Nonresidential Air Distribution

  This CASE Report will reduce the energy consumption of space conditioning fan systems in nonresidential buildings by both reducing static pressure in air ducts and adding a new metric that allows for more efficient fan selections. This includes three submeasures: high performance ducts/updates to fan power limits, improved fan efficiency metric, and expand duct leakage testing.