Optimum Composition of Alternative Refrigerant Mixture for Direct Expansion Solar-Assisted Heat Pump Using ANN and GA
In this paper, methodology for finding optimum composition of binary mixture (R290/R1270) for Solar-Assisted Heat Pump (Direct Expansion) is framed. Experiments are conducted on DX-SAHP by using R22 under the metrological condition of Calicut, India. Prop
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Abstract In this paper, methodology for finding optimum composition of binary mixture (R290/R1270) for Solar-Assisted Heat Pump (Direct Expansion) is framed. Experiments are conducted on DX-SAHP by using R22 under the metrological condition of Calicut, India. Properties of binary mixture such as vapour pressure, liquid density for mass percentage of R1270 ranging from 0 to 50% is taken from REFPROP 11® software. Artificial Neural Network (ANN) is integrated with Genetic algorithm (GA) in MATLAB 7.7.0® to obtain optimum composition of binary mixture, where maximized EPR (Energy Performance Ratio) and minimized cost of refrigerant are two objective functions. The result shows that, the optimum compositions of binary mixture are 70% of R290 with 30% of R1270. Unique feature of this study is that, ANN integrated with GA technique can be used to find best optimum composition of alternative refrigerant mixture by mass percentage for any given system, provided experimental data of that system should be available for R22 or any other refrigerant. Keywords Direct expansion solar-assisted heap pump refrigerant Optimize mixture composition
ANN GA Alternative
1 Introduction Heat pumps are one of the energy-efficient devices in the thermal applications. Integrating solar energy with heat pump technology is one of the best alternative technologies to improve the performance of the system performance. The solar-assisted heat pump system (Direct Expansion) performance is greatly influenced by the operating parameters such as ambient temperature, solar intensity and type of collector used in the system (acting as evaporator) and followed by wind K. Vinoth Kumar (&) L. Paradeshi M. Srinivas S. Jayaraj Department of Mechanical Engineering, National Institute of Technology, Calicut 673601, India e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 L. Chandra and A. Dixit (eds.), Concentrated Solar Thermal Energy Technologies, Springer Proceedings in Energy, https://doi.org/10.1007/978-981-10-4576-9_18
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velocity. The selection of working fluid also plays important role in the system performance. Because of good thermodynamic and thermosphysical properties of the R22, it has been widely used in the different applications. But the environmental properties such as Global warming potential (GWP) and Ozone depletion potential (ODP) for R22 are higher compared to hydrocarbons. As ODP and GWP value for R22 is high, Montreal and Kyoto protocol [1–3] made an agreement so as to phase out the usage of R22. So, there is a need to look for alternative refrigerant for DXSAHP and also that should be easily available. Numbers of investigations are reported for the replacement for R22 in different thermal applications. In that Hydrocarbons (HC) are one of the promising alternatives for the R22. The hydrocarbons are suffering from the flammability issue, hence its usage was stopped for many years for the safety concern. But considering environmental issue, restriction of usage of hydrocarb
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