Abstract
The refrigerant mass flow rate of a refrigerator compressor can only be measured by a mass flow meter and heat balance method. This paper focuses on the expansion and compression phase in which the compressor cylinder is closed, and proposes a measurement method of instantaneous mass flow of the refrigerator compressor. The comparison of the experimental pressure variation in the p–V diagram and the theoretical adiabatic process implied that the expansion and compression process of the refrigerator compressor approximated the adiabatic process. Based on the approximations and the experimental p–V diagram, a calculation method for refrigerant mass in the cylinder during the expansion and compression phase is proposed. Subsequently, the mass flow of the refrigerator compressor can be obtained. Furthermore, compared with experimental data and based on the method proposed in this paper, the error of the mass flow rate obtained is less than 3.13%. Based on this calculation method and the experimental p–V diagram, the influence of suction pressure on compressor performance is investigated.
Highlights
The refrigerator compressor determines the mass flow rate of the refrigerator system, which has a significant impact on the refrigeration capacity of the refrigerator [1,2]
Due to the high rotation speed, the refrigerant leakage and the heat exchange between the cylinder wall and the refrigerant can be ignored in the refrigerator compressor [12]
M com and m the refrigerant in the cylinder includes the fresh refrigerant suctioning from the suction line and the refrigerant remaining in the clearance volume
Summary
The refrigerator compressor determines the mass flow rate of the refrigerator system, which has a significant impact on the refrigeration capacity of the refrigerator [1,2]. The flow rate of refrigerant is an important performance parameter that reflects the transport capacity of the compressor [3,4]. The refrigerant flow rate of the compressor is usually measured by a mass flow meter in the refrigeration system or calculated by a mathematical model with many empirical coefficients. To predict the refrigerant mass flow rate in a domestic refrigerator, Fatouha et al [5]. Björk et al [6,7,8] proposed a simple technique to measure refrigerant mass flow rate by quick-closing valves and a tank.
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