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284 R. M. Lazzarin water to air heat pumps to the source renewable thermal source circulating pumps from the source Water loop plant with decentralised heat pumps operating both in heating and cooling mode. The ring is thermally balanced by an air cooling system and a thermal source that could be ground or surface or ground water. especially if the heat exchanger is only for sensible heat. Cold source is at an excellent temperature level and it is perfectly phased with the fresh air heating demand. A contemporary heating and cooling demand in the same building gives excel- lent possibilities of energy savings: this happens more often than one can imagine, particularly in well insulated commercial buildings. A water loop supplies to many reversible heat pumps installed in the different zones of the building moderate temperature water which is a good heat pump cold source but also a heat sink for the air conditioner (Fig. 26). Of course heating and cooling requirements are not always balanced: a water loop sometimes dissipates the excess heat (obviously in summer) and is sometimes lacking thermal energy: this must be supplied if pos- sible by a free and renewable source such as the ground. Systems operating on surface or ground water are an excellent possibility both as regards constancy of Figure 26. wet and dry cooler Downloaded from https://academic.oup.com/ijlct/article/2/3/262/758006 by guest on 21 June 2022 International Journal of Low Carbon Technologies 2/3PDF Image | Technological innovations in heat pump systems
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