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Technological innovations in heat pump systems 287 Figure 30. Simplified scheme of the energy system. Solar collectors satisfy almost completely summer hot water demand, storing the excess heat in a central aquifer storage set at a depth of 115 m, connected to the plant by two wells. In winter the stored heat is used both for preheating sanitary hot water and as the heat pump cold source. Each apartment block (about 40 apartments) is heated by two absorption heat pumps with an overall heating capacity of 76 kW. The water taken from the aquifer is the heat pump cold source. The storage can supply up to 45 m3/h at a starting temperature of 45oC at the beginning of the heating season. A short term storage is also provided with a volume of 9.5 m3 in each block. During sunny winter days, solar heat can be stored at a rather high temperature, which makes the heat usable for space heating and pre-heating of domestic hot water. A scheme of the energy system is represented in Fig. 30 with the two wells for con- nection with the aquifer on the right; for a single block solar section and short term storage are also represented. A 70% energy saving is anticipated. This project is expected to be the first in a series of similar projects in existing housing districts in Holland [12]. References [1] G. C. Groff, ‘Heat pumps – who uses them and why?’, 8th IEA Heat Pump Conference, Las Vegas, 2005. [2] H. Halozan, ‘Heat pumps and the environment’, 8th IEA Heat Pump Conference, Las Vegas, 2005. [3] P. Hubacher, ‘Field Analysis of Heat Pump Installations – the FAWA Project’, IEA Heat Pump Centre Newsletter, 22(2) (2004), 15–18. [4] I. Kilikis, ‘Advantages of combining heat pumps with radiant panel heating and cooling systems’, IEA Heat Pump Centre Newsletter, 11(4) (1993), 28–31. 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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