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Two-phase heat transfer during refrigerant evaporation in a solar collector tube (CROSBI ID 519657)

Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija

Soldo, Vladimir ; Grozdek, Marino ; Ćurko, Tonko Two-phase heat transfer during refrigerant evaporation in a solar collector tube // 61st ATI National Congress &#8211 ; International Session &#8220 ; Solar Heating and Cooling&#8221 ; (Conference Proceedings) / University of Perugia (ur.). Perugia: Morlakija, 2006. str. 207-212-x

Podaci o odgovornosti

Soldo, Vladimir ; Grozdek, Marino ; Ćurko, Tonko

engleski

Two-phase heat transfer during refrigerant evaporation in a solar collector tube

The paper presents the calculation of heat transfer in a tube of the solar collector (evaporator) where the refrigerant R134a evaporates. The test system used consists of a compressor, a freon-water compact plate condenser, an electronic expansion valve and two parallel unglazed solar collectors. The solar-assisted heat pump with direct expansion of the refrigerant in the solar collector uses the solar irradiation and the ambient temperature as a heat source on the evaporator. The heat transfer in the two-phase flow of the refrigerant in a horizontal tube is expressed by the expressions taken over from the VDI Wärmeatlas. The effect of the mass velocity G (kg/(m2 s)), the heat flux based on the inner surface of the tube q (W/m2) and the vapour quality x on the heat transfer coefficient in the heat pump solar collector is recorded. Results of calculation have shown that the nucleate boiling is dominant in the first part of the evaporator-collector, while in the second part of the evaporator, with the increase in vapour quality, the convective evaporation prevails.

Heat transfer; evaporation; solar collector

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Podaci o prilogu

207-212-x.

2006.

objavljeno

Podaci o matičnoj publikaciji

61st ATI National Congress &#8211 ; International Session &#8220 ; Solar Heating and Cooling&#8221 ; (Conference Proceedings)

University of Perugia

Perugia: Morlakija

Podaci o skupu

61st ATI National Congress &#8211 ; International Session &#8220 ; Solar Heating and Cooling&#8221 ;

predavanje

14.09.2006-14.09.2006

Perugia, Italija

Povezanost rada

Strojarstvo