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Technological innovations in heat pump systems 283 Figure 25. GAX water to water absorption heat pump (doc. Robur). water or the ground itself. Moreover the possible double heating and cooling effect could be exploited. Instead of the outside battery a heat exchanger is provided between the evaporating refrigerant and a hydronic circuit where refrigerated water for contemporary cooling and heating or cold water from one of the previously listed cold sources can circulate. 6. Heat pump systems progress Probably the most important technological innovations in heat pumps concern the systems. Firstly low temperature heating systems are often realised, usually radiant systems that can lower to something more than 30oC the heating fluid temperature. The lowering of the temperature has improved the COP well before other technologi- cal innovations. Secondly, cold sources different from outside air were selected. Four main possibilities should be mentioned: • heat recovery on mechanical ventilation systems; • waterloopsystems; • surface or ground water systems; • ground source heat pumps. A short description of these possibilities follows. As far as the heat recovery on the exhaust air is concerned, it can be operated with heat exchangers that can recover only a fraction of the available enthalpy, International Journal of Low Carbon Technologies 2/3 Downloaded from https://academic.oup.com/ijlct/article/2/3/262/758006 by guest on 21 June 2022PDF Image | Technological innovations in heat pump systems
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