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. Air-to-water heat pumps are currently not a mainstream HVAC technology in the California residential market due to a variety of market factors and a historical reliance on widely available natural gas for space and water heating. All-electric space conditioning is an emerging area of interest as the state is moving towards an increasingly decarbonized future and many energy efficiency advocates are promoting all-electric solutions for the residential market. This CASE Report will include the following four submeasures.
AWHP and Three Function Heat Pump
These two submeasures combined will improved performance characterization for air-to-water heat pumps and three function heat pumps (which provide water heating as well as space conditioning).
Hydronic Radiant Delivery
This submeasure will include radiant ceiling panels as a viable hydronic distribution system.
This submeasure will incorporate off-peak chilled water storage as a load-shifting measure.
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