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.
N. Chaiyat, C. Chaichana, “Working fluid selection for geothermal heat pump”, Engineering Journal Chiang Mai University, 2006, 13: 27–32.
N. Chaiyat, T. Kiatsiriroat, “Recovering and upgrading waste heat of air-conditioner by combining R-123 vapor compression heat pump,” In: Proceeding of the 9th Conference on Energy Heat and Mass Transfer in Thermal Equipment, Prachuap Khiri Khan, Thailand, March 11–12, 2010.
F. S. Singharajwarapan, N. Chaiyat, “Vapor compression heat pump using low temperature geothermal water: A case study of northern Thailand”, In: Proceeding of the 10th Asian Geothermal Symposium, Tagaytay, Philippines, September 22–24, 2013.
V. R. Pendyala, S. Devotta, V. S. Patwardhan, “Heat pump assisted dryer Part 2: Experimental study”, International Journal of Energy Research, 1990, 14: 493–507.
S. K. Chou, M. N. A. Hawlader, J. C. Ho, N. E. Wijeysundera, and S. Rajasekar, “Heat pump in the drying food products”, The Science and Technology Information Network of the Philippines, 1994, 8: 1–4.
S. Clements S, S. Jia, P. Jolly, “Experimental verification of a heat pump assisted continuous dryer simulation model”, International Journal of Energy Research, 1993, 17: 19–28.
G. S. Young, S. Birchall, R. L. Mason, “Heat pump drying of food products prediction of performance and energy efficiency”, In: Proceeding of the 4th ASEAN Conference on Energy Technology, Bangkok, Thailand, October17–20, 1995.
A. Sadchang, “Design and construction of heat pump dryer prototype for small industry,” Master Engineering Dissertation, Chiang Mai University, Chiang Mai, Thailand, 2006.
M. Burapha, T. Kiatsiriroat, “Simplified model of solar water heating with heat pump assisted”, The journal of industrial technology, 2008, 2: 15–23.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc, “ASHRAE Handbook fundamentals,” Refrigerant, American, 2009.
Properties of R-32, [Accessed 1 June 2014].
Properties of R-410a, [Accessed 1 June 2014].
Exchange rate, [Accessed 1 June 2014].