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Figure 8-5 zone 1 air handler (cooling only) zone 2 air handler (cooling only) zone 1 floor heating (P2) QuickSetter balancing valves AB AB (P1) QuickSetter balancing valves brazed plate stainless steel heat exchanger isolation / flushing valves check valve dip tube closely spaced tees diverter valve zone 2 floor heating entire system filled with antifreeze solution (S1) temperature ASSE 1017 anti-scald valve All piping and components conveying chilled water must be insulated and vapor sealed VARIABLE SPEED monobloc air-to-water heat pump DW flow switch (P3) sensor electric water heater temperature, the lower the target temperature calculated by this controller. The maximum water temperature during heating mode is 110oF. The minimum temperature is 80oF. The reset controller operates on a 10oF differential centered on the target temperature. These temperatures allow the heat pump to operate at a relatively high COP. During cooling mode, the heat pump and its associated circulator are turned on and off based on a temperature setpoint controller that monitors another sensor at the mid- point of the tank. The heat pump is turned on when the tank temperature is 60oF or higher. The heat pump is turned off when the tank temperature drops to 45oF. The heat pump operates independently of calls for cooling from the room thermostats. Spring check valves are used to prevent reverse thermosiphoning from the tank, and to limit chilled water migration into the heating portions of the distribution system. A magnetic dirt separator is used to protect the heat pump and high-efficiency circulator for dirt and iron oxides. SYSTEM #5 The system shown in Figure 8-5 provides two independently controlled zones of floor heating, as well as two associated zones of chilled water cooling. It also provides domestic hot water. This system is supplied by a variable-speed monobloc air- to-water heat pump. It’s variable speed capability allows the cooling portion of the system to operate without a buffer tank. In cooling mode, the speed of the heat pump’s compressor automatically adjusts as necessary to maintain a chilled water temperature between 45° and 60oF when either (or both) of the chilled water air handlers is operating. Note: Zoned cooling distribution systems should not be used with a fixed-speed heat pump unless a buffer tank is provided. A motorized diverter valve is used to route the heat pump’s output to the balance of the system associated with each mode of operation. It is possible for this system to deliver limited amounts of simultaneous heating and cooling. The buffer tank could deliver some amount of heating to the floor circuits as well as preheat domestic water while the heat pump is operating in cooling mode. One possible control scenario would be to set up controls to prioritize cooling operation during the cooling season and heating mode operation during the heating season. The heat pump would switch to the lower priority load only after temporarily satisfying the higher priority load. 78 (P4) OUTSIDE INSIDEPDF Image | Heat Pump Systems 2020
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