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Figure 4-16a the outdoor condenser unit and the hydronic distribution system. It contains a refrigerant-to-water heat exchanger, a motorized mixing valve, a circulator and a suction line accumulator (for the refrigerant circuit). Figure 4-15 shows how the internal components of this “hub” interface with the surrounding equipment. As shown in Figure 4-15, the refrigeration system is on. Hot refrigerant gas is circulating from the outdoor unit through the refrigerant-to-water heat exchanger, which is functioning as the condenser. Heated water is flowing into the buffer tank.. Heated water is also being extracted from one of the upper connections on the buffer tank and routed through the 3-way mixing valve to the radiant panel distribution system. This water flows through an electric boiler which may or may not be operating as a supplemental heat source depending on the required supply water temperature to the radiant panel circuits. This system can also provide chilled water for cooling. The coldest chilled water is passed to the air handler, where it provides some sensible cooling and dehumidification. Slightly warmer chilled water is provided to the radiant panel circuits for added sensible cooling. The motorized mixing valve in the “hub” maintains the temperature of the chilled water flowing to the radiant panel circuits above the dewpoint temperature of the space being cooling. This prevents surface condensation on the radiant panel. This approach has also been used to construct multiple stage air- to-water heat pump systems to provide space heating, cooling and domestic water heating for multi-family housing buildings. Figure 4-16 shows one example where three 2-stage air-to-water heat pump “hubs” connect to three buffer tanks. Each of these hubs connects to two independently controlled outdoor condenser units. INTEGRATED SYSTEMS In addition to monobloc, split systems, interior heat pumps and “hub” configurations, some manufacturers supply integrated air- to-water heat pumps. These “appliance” products contain all the hardware necessary to provide heated water for space heating, chilled water for space cooling, and heat for domestic hot water. They also contain electric resistance heating elements that can provide supplemental heating when necessary. Figure 4-17 shows an example of the components used in one of these systems. Figure 4-16b Figure 4-17 Courtesy of Groupe Atlantic Courtesy of ThermAtlantic 37PDF Image | Heat Pump Systems 2020
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