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Figure 7-21 cold domestic water DHW ASSE1017 anti-scald valve outside air outside air no-lead spring check stainless steel circulator desuperheater indoor unit valve space heating load split system air-to-water heat pump condensate drain rev. electric water heater outdoor unit refrigerant line set DHW electric water heater (in heating mode) no-lead spring check cold domestic water ASSE1017 anti-scald valve preheat tank DOMESTIC WATER HEATING OPTIONS There are several possible ways to use an air-to-water heat pump for domestic water heating. They include: • Using a desuperheater • Using an indirect water heater with large internal coil • Using a reverse indirect water heat • Using an “on-demand” external heat exchanger with flow switch DESUPERHEATER OPTION Some split system air-to-water heat pumps can be ordered with desuperheater heat exchangers. These were discussed in section 4. The desuperheater absorbs heat from the hot refrigerant vapor leaving the heat pump’s condenser and transfers it into a stream of domestic water. This heat transfer takes place whenever the heat pump’s compressor is operating, in heating or cooling mode. Some heat pumps turn off their internal desuperheater circulator when the leaving domestic water temperature reaches 130oF. Figure 7-21 shows a typical piping arrangement for this approach to domestic water heating. When the space heating system operates at low water temperature, or when the domestic hot water delivery temperature is high, the “two-tank” configuration is preferred. It allows the refrigeration system to operate at lower temperatures, which improves the heat pump’s COP. INDIRECT TANK OPTION Another option is to connect an indirect water heater as a priority zone. Since the water heater has several gallons of thermal mass, the buffer tank is bypassed in this mode of operation. One possible configuration is shown in Figure 7-22. 64 compressor condenser evaporator TXV outside insidePDF Image | Heat Pump Systems 2020
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