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subsequently insulated and fitted with new windows and doors or air sealed, the existing radiators may only have to provide a fraction of the heat output for which they were originally sized. This may allow the radiators to operate at a much lower water temperature, such as those available from an air-to-water heat pump. The heat output of cast iron radiators can be estimated for relatively low average water temperatures. The process requires that the surface area of the radiator be determined based on the radiator’s type and dimensions. idronics #25 provides detailed information for evaluating the suitability of using existing cast iron radiators in low- temperature distribution systems. REDUCING WATER TEMPERATURE IN EXISTING SYSTEMS There are many “legacy” hydronic heating systems designed to operate at water temperatures much higher than are possible when an air-to-water heat pump serves as the primary heat source. The required water temperature in those systems can be reduced through two methods: 1. Reducing the building’s design heating load. 2. Adding heat emitters to the distribution system. It is also possible to use a combination of these methods. idronics #25 provides analytical methods for assessing the impact of both methods for reducing water temperature. It also shows several techniques for adding heat emitters to existing distribution systems. 52PDF Image | Heat Pump Systems 2020
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