R-290 Vapor Compression Heat Pump for Recovering and Upgrading Waste Heat of Air-Conditioner by Using Spiral Coil Tank
International Journal of Sustainable and Green Energy
Volume 4, Issue 1-1, January 2015, Pages: 50-56
Received: Oct. 29, 2014;
Accepted: Oct. 31, 2014;
Published: Jan. 12, 2015
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Nattaporn Chaiyat, School of Renewable Energy, Maejo University, Chiang Mai, Thailand
Natthawud Dussadee, School of Renewable Energy, Maejo University, Chiang Mai, Thailand
In this study, a concept of using a vapor compression heat pump for recovering and upgrading waste heat of an air-conditioner has been presented. R-290 has been selected due to its high efficiency and the environmental impact. R-290 heat pump at heating capacity 3 kW has been constructed to recover waste heat from the discharge refrigerant leaving compressor of R-134a air-conditioner at cooling capacity 1 TR. From the study results, it could be seen that the modified unit gives better EERAC when the cooling water does not over 43 ºC. A set of simplified model has been developed to predict the system performance and the simulated results agree quite well with the measured data. Moreover, profile of hot water consumption in the department of children's hospital room, Maharaj Nakorn Chiang Mai Hospital is chosen to study. It was found that the hospital requires hot water is 0.815 m3/d at 50 ºC temperature, one unit of R-290 heat pump is enough to generate hot water with the economic results of saving cost and payback period around 765.46 USD/y and 1.97 y, respectively.
R-290 Vapor Compression Heat Pump for Recovering and Upgrading Waste Heat of Air-Conditioner by Using Spiral Coil Tank, International Journal of Sustainable and Green Energy. Special Issue: Renewable Energy Applications in the Agricultural Field and Natural Resource Technology.
Vol. 4, No. 1-1,
2015, pp. 50-56.
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