Browse > Article
http://dx.doi.org/10.6110/KJACR.2013.25.4.173

Optimum Design of Middle-Sized CO2 Water Heater  

Park, Hanvit (Department of Mechanical Engineering, Hanbat National University)
Yun, Rin (Department of Mechanical Engineering, Hanbat National University)
Kim, Young Deug (Department of Mechanical and Automotive Engineering, Induk University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.25, no.4, 2013 , pp. 173-179 More about this Journal
Abstract
Middle-sized $CO_2$ water heater having compressor power of 7.45 kW was designed, and its performances were experimentally tested. Besides, optimum design of the $CO_2$ water heater was conducted by cycle simulation. When ambient temperature of $7^{\circ}C$ and hot water outlet temperature of $80^{\circ}C$ the $CO_2$ water heater showed the COP of 3.2. As hot water temperature increased the COP is getting decreased due to significant increase of compressor power consumption compared to increasing rate of heating capacity. When ambient temperature increased from $-3^{\circ}C$ to $12^{\circ}C$ the COP increased by 30%. The optimum components design of a gas cooler, an internal heat exchanger, and an evaporator were conducted, and the experimental correlation between amount of EEV opening and ambient temperature, and hot water temperature was suggested.
Keywords
$CO_2$ water heater; Gascooler; IHX; EEV; Evaporator; R744; COP;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Laipradit, P., Tiansuwan, J., Kiatsiriroat, T., and Aye, L., 2008, Theoretical performance analysis of heat pump water heater using carbone dioxide as refrigerant, Int. J. Energy Res, Vol. 32, pp. 356-366.   DOI   ScienceOn
2 Swamee, P. K., Aggarwal, N., and Aggarwal, V., 2008, Optimum design of double pipe heat exchanger, International Journal of Heat and Mass Transfer, Vol. 51, pp. 2260-2266.   DOI   ScienceOn
3 Cho, H. H., Lee, M. Y., and Kim, Y. C., 2009, Numerical evaluation on the performance of advanced $CO_2$ cycles in the cooling mode operation, Applied Thermal Engineering, Vol. 29, pp. 1485-1492.   DOI   ScienceOn
4 Beak, C. H., Lee, E. C., Kang, H., Kim, Y. C., Cho, H. H., and Cho, S. W., 2008, Experimental study on the heating performance of a $CO_2$ heat pump water heater, Proceeding of the SAREK 2008 Winter Annual Conference, pp. 310-315.
5 Choi, K. M., Jeon, M. J., Son, C. H., and Oh, H. K., 2009, Performance analysis of R744(carbon dioxide) transcritical refrigeration system using internal heat exchanger, Proceedings of the KSME 2009 Thermal Engineering Division Spring Annual Meeting, pp. 538-544.
6 Son, C. H., Lee, D. G., Oh, H. K., and Kim, Y. L., 2004, The heat transfer and pressure drop characteristics of $CO_2$ during supercritical region in a horizontal tube, Journal of Korean Society of Marine Engineers, Vol. 28, No. 3, pp. 500-508.   과학기술학회마을
7 Park, H. V. and Yun, R., 2012, Studies on performance of $CO_2$ water heater by numerical modeling, Korean Journal of Air-Conditioning and Refrigeration, Vol. 25, pp. 1-8.   과학기술학회마을   DOI   ScienceOn