Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 1241–1252 | Cite as

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

An experimental study
  • R. Prabakaran
  • D. Mohan Lal


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.


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

List of symbols


Air conditioning


Coefficient of performance


Dry bulb temperature (°C)


Degree of subcooling


Degree of superheating


Exergy destruction rate (kW)


Exergy destruction ratio






Enthalpy (kJ kg−1)




Heating, ventilation and air conditioning


Internal heat exchanger


Integrated receiver dryer condenser


Mass flow rate (kg s−1)


Mobile air conditioning


Pressure (bar)


Pressure ratio


Heat transfer (kW)


Relative humidity (%)


Regulated power supply


Entropy (kJ kg−1 K−1)


Temperature (°C)


Thermostatic expansion valve


Vapour compression refrigeration system


Variable frequency drive


Work consumption (kW)


Efficiency (%)









Electrical power






Expansion device




Dead state




Reference state



The authors acknowledge the Centre for Research, Anna University, for providing Anna Centenary Research Fellowship (ACRF) (Ref No.CFR/ACRF/2015/4, Dated 21.01.2015) towards this doctoral level research.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Refrigeration and Air Conditioning Division, Department of Mechanical EngineeringAnna UniversityChennaiIndia

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