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
Article

Abstract

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.

Keywords

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

List of symbols

A/C

Air conditioning

COP

Coefficient of performance

DBT

Dry bulb temperature (°C)

DSC

Degree of subcooling

DSH

Degree of superheating

ED

Exergy destruction rate (kW)

EDR

Exergy destruction ratio

F

Fans

H

Heaters

h

Enthalpy (kJ kg−1)

HC

Hydrocarbon

HVAC

Heating, ventilation and air conditioning

IHX

Internal heat exchanger

IRDC

Integrated receiver dryer condenser

\(\dot{m}\)

Mass flow rate (kg s−1)

MAC

Mobile air conditioning

P

Pressure (bar)

PR

Pressure ratio

Q

Heat transfer (kW)

RH

Relative humidity (%)

RPS

Regulated power supply

\(\dot{S}\)

Entropy (kJ kg−1 K−1)

T

Temperature (°C)

TXV

Thermostatic expansion valve

VCRS

Vapour compression refrigeration system

VFD

Variable frequency drive

W

Work consumption (kW)

η

Efficiency (%)

Subscripts

comp

Compressor

cond

Condenser

d

Discharge

ele

Electrical power

evap

Evaporator

ex

Exergy

exp

Expansion device

gen

Generation

o

Dead state

r

Refrigerant

ref

Reference state

Notes

Acknowledgements

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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