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Figure 7-24 outside air tankless electric water heater outside air PRV CW stainless steel inner tank zone returns DHW isolation / flushing valves ASSE 1017 anti-scald valve rev. valve outdoor unit variable-speed pressure-regulated circulator zone valves indoor unit split system air-to-water heat pump (in heating mode) tank-in-tank buffer for domestic water preheating condenser heating mode refrigerant line set inside compressor TXV evaporator outside piping from the heat pump to the tank. This valve opens when the heat pump operates and closes at all other times. The valve has two purposes. First, it prevents water returning from the space heating zones from passing through the heat pump when it is off. If otherwise allowed, this flow would needlessly dissipate heat into the mechanical room and lower the temperature of the water supplied to the space heating zones. The motorized ball valve also prevents reverse thermosiphoning from the tank through the heat pump when the latter is off. This second function eliminates the need to install a check valve to prevent reverse thermosiphoning. Another option is to use a “tank-in-tank” buffer, as shown in Figure 7-24. The buffer tank has an internal stainless steel tank which holds domestic water. The inner tank is surrounded by heated water supplied from the heat pump and used for the space heating distribution system. Cold domestic water flows into the inner tank whenever hot water is drawn at a fixture. The temperature of the heated domestic water leaving the inner tank depends on the temperature of the water in the outer tank, as well as the rate at which domestic hot water is drawn. An electric tankless water heater is shown as a supplemental heater to boost the domestic water to the required delivery temperature. An ASSE 1017-rated mixing valve is used to ensure that the temperature of the water delivered to the plumbing distribution system doesn’t exceed 120oF. These approaches to domestic water heating could be used in a system that supplies chilled water for cooling. However, if the cooling distribution system is zoned, and the heat pump uses a fixed-speed compressor, a separate chilled water buffer tank would be required. If a variable- speed heat pump is used, and the cooling distribution system is not highly zoned, the chilled water buffer tank could likely be eliminated. 67PDF Image | Heat Pump Systems 2020
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