Naslov
Experimental and Analytical Results of the Solar-assisted Heat Pump Performance

Autori
Soldo, Vladimir ; Ćurko, Tonko ; Grozdek, Marino

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Hlajenje in klimatizacija / Šarlah, Alen - Ljubljana : Slovensko društvo hladilne in klimatizacijske tehnike, 2004, 159-170

Skup
VII SDHK Conference: Refrigeration and Air Conditioning

Mjesto i datum
Laško, Slovenija, 05.11.2004. - 06.11.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
solar-assisted heat pump; collector efficiency; COP

Sažetak
The paper presents an analysis of a heat pump of a type which is neither fully investigated nor widely applied. A solar-assisted heat pump with direct evaporation of the refrigerant in a solar collector uses solar energy and the ambient air as a heat source on the evaporator. Due to the high collector efficiency in the performance of solar-assisted pumps (eta_coll = 0.6 - 0.9) compared with the collector efficiency of conventional solar systems (eta_coll = 0.4 - 0.6), and due to the fact that they can operate even in cloudy weather conditions, solar-assisted heat pumps attract growing attention on the part of researchers and users. 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 obtained results show a great impact of solar irradiation, ambient temperature and compressor speed on the properties of the system. The COP of the heat pump is in the range from 4 to 7, depending on the system parameters settings.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA