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268 R. M. Lazzarin SNG A/W 100% HP SNG A/W 0% HP SNG B/W 100% HP SNG B/W 0% HP SNG [-] SPF year n/year 1 [-] Figure 8. SPF for air (A/W) and water (B/W) heat pumps according to the provision or not of domestic water heating service. 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 Figure 7. 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Relative variation of nSPF 2 all heat pumps 23456789 year Relative SPF variation starting from the first working year. duration of the fault (time from notice to rectification) was only six hours (!). Depending on the type of fault, out of service times ranged from about two hours to more than three days. SPF survey during the years did not show appreciable variations (Fig. 7) with very stable performance. Domestic water heating is very important to improve SPF of the plants with regard to the only ambient heating for both kinds of heat pump systems (Fig. 8). A final interesting datum regarding ground source heat pumps is where the average circulating fluid temperature was 5oC, a much higher temperature than 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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