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A new appliance of LPG as a current factor in the heat pump and refrigerating systems

Białko B., Królicki Z.

Archives of Thermodynamics

2008

Vol. 29, no. 4

3-12

Abstract Liquefied petroleum gas (LPG) is a fuel which is widely applied in transport engineering. It consists of saturated hydrocarbons, especially propane, butane and other substances (less than 1 %). These two main components are used in refrigerators, air-conditioners and heat pumps as well and are known as HC 290 (propane) and HC 600a (isobutane). In recent years when ecological aspects of refrigerants application are very important for designers and manufactures LPG can be considered as substitute for R134a. Experimental results of the refrigerators using LPG show that the lowest electrical energy consumption, higher volumetric cooling capacity and lower freezer temperature can be achieved compared to R134a. But the composition of this zeotropic mixture depends on a season. During the winter the mixture consists more propane whereas during the summer butane is a dominant component of the mixture. These conditions change the characteristic parameters of the cycle. The paper presents theoretical analysis and experimental results of a pressure ratio, power consumption and COP changes depending of LPG composition and discuss with the thesis that LPG can be an appropriate long-term candidate to replace R134a in the existing and new heat pumps and refrigerators.