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Retrofitting an air-conditioning device to utilize R1234yf and R1234ze(E) refrigerants as alternatives to R22

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Journal of the Brazilian Society of Mechanical Sciences and Engineering Aims and scope Submit manuscript

Abstract

The thermodynamic behaviour of R1234yf and R1234ze(E) refrigerants in air conditioners having moderate and high evaporation temperatures applications was experimentally investigated in this study. In this context, the compressor oil of a split-type air conditioner was only changed and the experiments were performed under four different ambient temperatures. The evaporation temperatures of R1234yf were noted as similar to that of R22. It was found that cooling capacities of R1234yf and R1234ze(E) were lower in comparison with R22. On the other hand, the largest power consumption amount was developed for R22 among the tested refrigerants. It was determined compared to R22 that refrigerant charging amounts of R1234ze(E) and R1234yf were lower by about 16 and 12%, respectively. Basically, although the cooling capacity and power consumption of R1234yf amounts were higher than that of R1234ze(E), COP value of the latter was seen to be greater. According to the results, it is suitable that the air-conditioning systems may be alternatively charged with R1234ze(E) as a substitute for R22 as far as COP is considered.

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Abbreviations

COP:

Coefficient of performance

GWP:

Global warming potential

h :

Enthalpy, kJ/kg

h′:

Enthalpy in a process for constant entropy, kJ/kg

\(\dot{m}\) :

Mass flow rate of refrigerant, kg/s

\(\dot{n}\) :

Rotational speed for the compressor, rpm

P :

Pressure, kPa

Q e :

Cooling capacity, W

T :

Temperature, °C

υ :

Specific volume, m3/kg

V disp :

Displacement of the compressor per revolution, m3/rev

W el :

Power consumption of compressor, W

η s :

Isentropic efficiency

η v :

Volumetric efficiency

a:

Ambient

c:

Condenser

d:

Discharge

e:

Evaporator

H:

High

L:

Low

comp:

Compressor

in:

Inlet state

out:

Exit state

suc:

Suction

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Acknowledgements

The authors are indebted to Dicle University Scientific Research Projects Coordination Unit for the financial support through research Project no. MÜHENDİSLİK 15-004.

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Correspondence to Atilla G. Devecioğlu.

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Technical Editor: Jose A. R. Parise.

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Oruç, V., Devecioğlu, A.G. Retrofitting an air-conditioning device to utilize R1234yf and R1234ze(E) refrigerants as alternatives to R22. J Braz. Soc. Mech. Sci. Eng. 40, 226 (2018). https://doi.org/10.1007/s40430-018-1154-0

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