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DEFINITIONS AWHP: Air-to-water heat pump, also known as a reverse-cycle chiller, which exchanges energy with outdoor air to condition water for heating and cooling. In some buildings, a source of warm air other than outdoor air may be available for use as a heating energy source, but in most multifamily scenarios, the air source will be ambient outdoor air BA Climate Zone: Building America Climate Zone definitions used in RECS – see Appendix B for zone divisions ccASHP: cold-climate air source heat pump, typically a split heat pump for residential or single apartment use, that can hold its rated capacity down to an ambient air temperature of five degrees Fahrenheit DHW: Domestic hot water EPA: Environmental Protection Agency GHG: Those gases, such as water vapor, carbon dioxide, nitrous oxide, methane, hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulfur hexafluoride, that are transparent to solar (short-wave) radiation but opaque to long-wave (infrared) radiation, thus preventing long-wave radiant energy from leaving Earth's atmosphere. The net effect is a trapping of absorbed radiation and a tendency to warm the planet's surface10 GSHP: Ground-source heat pump - a water source heat pump which exchanges heat with the ground using water piping GWP: Global Warming Potential, an index used to compare the relative radiative forcing of different gases without directly calculating the changes in atmospheric concentrations. GWPs are calculated as the ratio of the radiative forcing that would result from the emission of one kilogram of a greenhouse gas to that from the emission of one kilogram of carbon dioxide over a fixed period of time, such as 100 years11 HPWH: Heat pump water heater, a term generally referring to integrated tank water heaters used in single family homes; technically these are a form of air-to-water heat pumps MBH: Thousand BTU per hour, BTU being a British Thermal Unit, or 1/3,412 kWh Mini-split: a small capacity split heat pump that can serve up to four zones (typically) with a single small outdoor unit located nearby on an outside wall or roof. These systems are commonly used to add cooling to a home as a middle ground between window air conditioner units and a whole-house central cooling system PTAC: Packaged terminal air conditioner, sometimes paired with a heating coil from a central steam or hot water plant, or direct gas-fired or electric resistance heat PTHP: Packaged terminal heat pump RECS: Residential Energy Consumption Survey, a study completed by the Energy Information Agency to classify housing types across the United States TBTU: Trillion BTU VRF: Variable refrigerant flow, a name used in industry to define central heat pump plants with refrigerant distribution systems serving multiple spaces WSHP: Water source heat pump, meaning a water to air heat pump in this context Steven Winter Associates,Inc. 5PDF Image | HEAT PUMP RETROFIT STRATEGIES FOR MULTIFAMILY BUILDINGS
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