A novel exergy based charge optimisation for a mobile air conditioning system

作者：Prabakaran R; Lal D Mohan

来源：Journal of Thermal Analysis and Calorimetry, 2018, 132(2): 1241-1252.

DOI：10.1007/s10973-018-6998-0

• Mobile air conditioning
• Optimum refrigerant charge
• Exergetic efficiency
• COP
• R134a
• Exergy destruction

In this paper, a novel exergy based charge optimisation technique is proposed instead of coefficient of performance (COP) based method for a mobile air conditioning system. The exergy destructions in each of the components in the system as a function of compressor speed and refrigerant charge level were estimated based on experimental data. It was found that the COP of the system decreases as the compressor speed increases, while the total exergy destruction in the system increases. The exergetic analysis of performance data showed that the percentage loss in the compressor, evaporator, condenser and thermostatic expansion valve lies in the range of 59.88-69.9%, 17.53-25%, 7.80-16.36% and 3.05-15.73%, respectively. Based on COP, the optimum charge varied with respect to compressor speed. The exergy based optimisation is found to be more reliable and consistently yielding a single optimum charge of 620 g irrespective of the compressor speed. The maximum exergetic efficiencies at 620 g were 43.32% and 38.15% for 900 rpm and 1800 rpm respectively.

• 出版日期2018-5