Sustainable Energy
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Sustainable Energy. 2019, 7(1), 6-14
DOI: 10.12691/rse-7-1-2
Open AccessArticle

The Utilization of Renewable Energy Source and Environment Friendly Refrigerants in Cooling Mode

Ali H. Tarrad1,

1Mechanical Engineering, Consultant Engineer/Thermal Engineering Specialist, France

Pub. Date: September 20, 2019

Cite this paper:
Ali H. Tarrad. The Utilization of Renewable Energy Source and Environment Friendly Refrigerants in Cooling Mode. Sustainable Energy. 2019; 7(1):6-14. doi: 10.12691/rse-7-1-2


This investigation focuses on the renewable geothermal energy source utilized as a reservoir for a water chiller unit in the cooling mode. Two hydrocarbon refrigerants, R290 and R600a were suggested to be implemented in a closed loop system to produce chilled water for air conditioning purposes. The traditional R-22 and its substitute R410A were also investigated in a direct expansion geothermal system. The analysis was carried out at the evaporation and condensation temperature ranges of (-25 to -5) °C and (15 to 35) °C respectively. The data showed that R-290 revealed similar coefficient of performance as that of R-22. R-410A exhibited a lower coefficient of performance than that of the R-22 refrigerant by (1-5) %. On the contrary, R-600a showed a higher coefficient of performance than that of the R-22 by about (3) % for the investigation range of operating conditions. R-410A refrigerant exhibited the highest load in comparison with R-22 among other circulated refrigerants by (1.5) %. R-600a showed a lower condenser load than that of the R-22 system by a negligible margin value. The hydrocarbon refrigerants and the azeotrop mixture were found to be proper candidates to replace R-22 in geothermal system.

geothermal energy source refrigerant alternatives hydrocarbon refrigerants water chillers

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[1]  Kim, D. H., Park, H. S. and Kim, M. S., “Characteristics of R134a/R410A Cascade Heat Pump and Optimization”, International Refrigeration and Air Conditioning Conference at Purdue, Paper no. 2425, pp1-7, (2012).
[2]  Kim, J., Lee, J. Choi, H, Lee S., Oh, S. and Park, W., Experimental study of R134a/R410A Cascade cycle for variable refrigerant flow heat pump systems, Journal of Mechanical Science and Technology, 29 (12), pp 5447-5458, 2015.
[3]  Tarrad, A. H., “Thermodynamic Performance Evaluation for Low Temperature Heat Source Cascade System Circulating Environment Friendly Refrigerants,” Int. J. Energy Environ. Sci., 2(2), pp. 36-47, March 2017.
[4]  Tarrad, A. H., “Thermodynamic Analysis for Hybrid Low Temperature Sustainable Energy Sources in Cascade Heat Pump Technology,” Asian J. Eng. Technol., 5(2), pp. 29-46, April 2017.
[5]  Tarrad, A. H., “Performance Optimization for a Proper Heat Pump Technology Functions at Low Temperature Heat Source,” Int. Res. J. Power Energy Eng., 2(1), pp. 19-34, June 2017.
[6]  Tarrad, A. H., “Thermodynamic Evaluation for Intermediate Temperature Optimization in Low Temperature Heat Source Cascade Heat Pump Technology”, Asian Journal of Engineering and Technology, Vol. 5 (5), pp. 126-139, October 2017.
[7]  Tarrad, A. H., “Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source,” Int. J. Econ. Energy Environ., 2(2), pp. 13-24, 2017.
[8]  Tarrad, A. H., “A Perspective Evaluation Methodology for Economic Feasibility of Low Temperature Sustainable Energy Source in Heating Mode Technology”, Transactions of the ASME, Journal of Energy Resources Technology, Vol. 140, pp. 020902-1 to 020902-10, February 2018.
[9]  “Energy Efficiency and Renewable Energy”, Guide to Geothermal Heat Pumps, U.S. Department of Energy, DOE/EE-0385, February 2011.
[10]  Yrjölä, J. and Laaksonen, E., Domestic hot water production with ground source heat pump in apartment buildings, Energies, 8 (8), pp 8447-8466, 2015.
[11]  Ali M H, Selamat S, Kariya K, Miyara A, “Experimental performance estimations of horizontal ground heat exchangers for GSHP system”, 16th International Refrigeration and Air Conditioning Conference, Purdue, Paper 1808, Purdue University, USA, 2016.
[12]  ASHRAE 34-2019, Designation and Safety Classification of Refrigerants, 2019.
[13]  “Underground Propane Piping - Yard Line”, Retrieved 25-08-2019.
[14]  BS 4434: 1995 Specification for safety and environmental aspects in the design, construction and installation of refrigerating appliances and systems, BSI, London 1997.
[15]  BS EN 378: 2000 Refrigerating systems and heat pumps – safety and environmental requirements, 2000.
[16]  "Gases - Explosive and Flammability Concentration Limits". Retrieved 09-09-2013.
[17]  "Applications: Tube, Pipe & Fittings: Direct-Exchange Geothermal Heating/Cooling Technology". Retrieved 11-17-2016.
[18]  Technical University of Denmark (DTU), “CoolPack Software: A Collection of Simulation Tools for Refrigeration”, Denmark. 2001.
[19]  “Ground Loop Heat Exchanger Design Software”, International Ground Source heat Pump Association (IGSHPA).
[20]  Gaia Geothermal. Ground Loop Design Software, GLD, 2009.