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heat pump heat pump INTERIOR AIR-TO-WATER HEAT PUMPS There are also air-to-water heat pumps that are designed to be located inside buildings. They use short lengths of ducting to bring outside air to their air-handling section, as well as to discharge that air back outside. Having the heat pump inside has the following advantages: • There is no outdoor equipment beyond air intake and discharge grills on the side of the building • A desuperheater can be incorporated for domestic water heating • The system can be operated without antifreeze • Degradation of equipment due to weather exposure is eliminated • There is less potential for debris to collect on heat transfer coil surfaces Disadvantages of interior air-to-water heat pumps include: • Require more interior space • Brings compressor sound inside the building • Requires careful coordination with building design to ensure that adequately sized ducting can be accommodated and terminated above snow level. Figure 4-12 shows an example of an interior air-to-water heat pump. The large diameter insulated flexible ducting brings outdoor air to the unit and exhausts it back outside. It’s important to locate the air intake and discharge openings to prevent cross flow of discharge air into the Figure 4-12 Figure 4-13 intake opening. Manufacturers of interior air-to-water heat pumps typically specify minimum separation distances and provide options such as exterior hoods specifically designed to eliminate crossflow. Some possible options are shown in Figure 4-13. Interior air-to-water heat pumps are currently offered in Europe, but as of this writing, are not available in North America. OTHER AIR-TO-WATER HEAT PUMP SYSTEM CONFIGURATIONS Another approach to heating and cooling based on an air-to-water heat pump involves use of a “hub” module that connects to and controls several peripheral devices, such as the outdoor condenser, buffer tank and distribution system. Figure 4-14 shows an example of such a product. The white box mounted to the mechanical room wall is the “hub” of this air-to-water heat pump system. It connects to the buffer tank, 35 Courtesy of HotJet.cz heat pump heat pumpPDF Image | Heat Pump Systems 2020
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