Page 28 - Designing for Zero Carbon-Volume 2_Case Studies of All-Electric Multifamily Residential Buildings

CASE STUDY NO. 1
IVY SENIOR APARTMENTS
(Below) Plumbing diagram for the Central Heat Pump Water Heating System used at the Ivy Senior Apartments.
cycle, and one or more indoor units in the occupied space, which consists of coils through which refrigerant circulates to a fan coil.
This ductless system works well in these apartments, where space is at a premium and ceiling height is not diminished by the need to create soffits for duct space. The apartments have rela- tively high ceilings without adding cost by increasing the floor-to-floor height. Higher ceilings also allow taller windows, resulting in good daylight penetration into the units.
The heat pump has the capacity to produce up to 12,000 Btu/hr at the fan coil in each of the 52 studio apartments. For the on-site manager’s two-bedroom apartment, two additional fan coils of 9,000 Btu/hr capacity each are located in the additional bedroom spaces.
The remaining spaces in the building, namely the reception area/mailroom, multipurpose room, administrative office, health service rooms and the laundry room, use ducted-air heat pump sys- tems. These are better suited to the more complex floor plans with a variety of uses.
Electric heat pumps are now prescriptively required by the 2022 California Title-24 energy code for either space heating or hot water in multifamily housing in lieu of gas furnaces or gas water heaters. Projects may still install the gas option, but would have to demonstrate compliance through the performance approach by improving the energy efficiency of other building features in order to comply.
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Designing for Zero Carbon: Volume 2