Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/135
Title: Thermodynamic analysis of subcooling and superheating effects of alternative refrigerants for vapour compression refrigeration cycles
Authors: Sencan, Arzu 
Selbas, Resat 
Kzlkan, Önder 
Kalogirou, Soteris A. 
Sencan, Arzu 
Selbas, Resat 
Kzlkan, ?nder 
Kalogirou, Soteris A. 
Keywords: First law analysis
Exergy analysis
Subcooling
Heat exchangers
Refrigeration
Issue Date: 2005
Publisher: John Wiley & Sons, Ltd.
Source: International Journal of Energy Research, 2005, Volume 30 Issue 5, p 323 - 347
Abstract: This paper presents a computer-based first law and exergy analysis applied to vapour compression refrigeration systems for determining subcooling and superheating effects of environmentally safe new refrigerants. Three refrigerants are considered: R134a, R407c and R410a. It is found that subcooling and superheating temperatures directly influence the system performance as both condenser and evaporator temperatures are affected. The thermodynamic properties of the refrigerants are formulated using artificial neural network (ANN) methodology. Six ANNs were trained to predict various properties of the three refrigerants. The training and validation of the ANNs were performed with good accuracy. The correlation coefficient obtained when unknown data were used to the networks were found to be equal or very near to 1 which is very satisfactory. Additionally, the present methodology proved to be much better than the linear multiple regression analysis. From the analysis of the results it is found that condenser and evaporator temperatures have strong effects on coefficient of performance (COP) and system irreversibility. Also both subcooling and superheating affect the system performance. This effect is similar for R134a and R407c, and different for R410a.
URI: http://ktisis.cut.ac.cy/handle/10488/135
ISSN: 1099-114X
DOI: 10.1002/er.1151
Rights: © 2009 John Wiley & Sons, Ltd.
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