Pregled bibliografske jedinice broj: 175283
Thermal Performance of a Direct Expansion Solar Assisted Heat Pump
Thermal Performance of a Direct Expansion Solar Assisted Heat Pump // Proceedings of the 2004 International Refrigeration and air Conditioning Conference at Purdue / Groll, Eckard A. (ur.).
West Lafayette (IN): Purdue University, 2004. str. R081, 1-8 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
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Naslov
Thermal Performance of a Direct Expansion Solar Assisted Heat Pump
Autori
Soldo, Vladimir ; Ćurko, Tonko ; Balen, Igor
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings of the 2004 International Refrigeration and air Conditioning Conference at Purdue
/ Groll, Eckard A. - West Lafayette (IN) : Purdue University, 2004, R081, 1-8
Skup
Tenth International Refrigeration and Air Conditioning Conference at Purdue
Mjesto i datum
West Lafayette (IN), Sjedinjene Američke Države, 10.07.2004. - 15.07.2004
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
solar assisted heat pump; direct expansion; COP
Sažetak
Solar assisted heat pump systems are nowadays rarely presented on the growing solar market compared to the conventional solar hot water systems. Due to the high evaporation temperatures that are achieved when using solar irradiation as a dominant heat source for evaporation (instead of surrounding air, sea water, ground heat, etc.), solar heat pumps can yield remarkably higher (2 to 3 times) values of COP. In order to prevent a great deterioration of the COP due to inconsistent weather conditions and irradiation, every such system should be carefully optimized in terms of solar collector area, capacity of compressor, evaporating and condensing temperatures. Analytical and experimental studies were carried out on a solar assisted heat pump consisting of two flat-plate solar collectors acting as an evaporator for the refrigerant R-134a, a variable-frequency reciprocating type compressor, a compact plate heat exchanger (condenser) and an electronic expansion valve. The average values of COP ranged from 4 to 9 and solar collector efficiencies from 60 % to 85 % were recorded during the period characterized by relatively high mean solar irradiation. The results of the system thermal performance simulation were obtained for metrological and heat load conditions during the whole year. The results of simulation were compared to the measured values for the system COP and the power used by the compressor. The developed simulation model enables both, the optimization of the system components and of operating parameters.
Izvorni jezik
Engleski
Znanstvena područja
Strojarstvo
POVEZANOST RADA
