Browse > Article

Effects of Refrigerant Charge Amount on the Cooling Performance of a Transcritical $CO_{2}$ Cycle  

Cho Honghyun (Graduate School of Mechanical Engineering, Korea University)
Ryu Changgi (Graduate School of Mechanical Engineering, Korea University)
Kim Yongchan (Department of Mechanical Engineering, Korea University)
Sim Yunhee (Department of Energy & Environment, Kyungmin College)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.5, 2005 , pp. 410-417 More about this Journal
Abstract
The cooling performance of a transcritical $CO_{2}$ cycle varies significantly with a variation of refrigerant charge amount. In this study, the performance of the $CO_{2}$ system was measured and analyzed by varying refrigerant charge amount at a standard test condition. Besides, the losses of the major components in the $CO_{2}$ system were estimated by evaluating entropy generation with refrigerant charge amount. The losses in the expansion device and the gascooler show the major portion of the total loss. For undercharging conditions, the expansion loss dominates the overall system performance, while the gascooler loss increases significantly with an increase of refrigerant charge amount.
Keywords
Carbon dioxide; Refrigerant charge amount; Entropy; COP; Loss;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Hwang, Y. and Radermacher, R, 1999, Experimental investigation of the $C0_2$ refrigeration cycle, ASHRAE Transactions, Vol. 105, Pt. 1, pp. 1219-1227
2 Halozan, H. and Rieberer, R, 2000, $C0_2$ as refrigerant-possible applications, 4th IIRGustav Lorentzen Conference, pp. 43-50
3 Kim, M., Pettersen, J. and Bullard, C., 2004, Fundamental process and system design issues in $C0_2$ vapor compression systems, Progress in Energy and Combustion Science, Vol. 30, pp.119-174   DOI   ScienceOn
4 Kim, S., 2002, Study on performance of heat pump for hot water heater and autocascade cycle using $C0_2$, Ph.D. Thesis, Seoul National University, Seoul, Korea
5 Park, T., Lee, M., Jung, J. and Jang, G., 2004, Comparison of performance variation between R22 and R410A refrigerant systems, Korea Journal of Air-conditioning and Refrigeration, Vol. 15, No.3, pp. 166-176
6 Cho, H., Ryu, C. and Kim, Y., 2004, Experimental study on the cooling performance of a $C0_2$ cycle with internal heat exchanger, Proceeding of the SAREK '04 Winter Annual Conference, pp. 571-576
7 Hwang, Y., Huff, H., Preissner, R and Radermacher, R, 2001, $C0_2$ transcritical cycles for high temperature application, Proceedings of 2001 ASME Int. Mechanical Engineering Congress in New York, IMECE2001/ AES23630
8 Ha, J, 1999, Experimental study on the characteristics of flow rate distribution and performance of a multi-heat pump system, MS. Thesis, Korea University, Seoul, Korea
9 Neksa, P., 2002, $C0_2$ heat pump systems, Int. Journal of Refrigeration, Vol. 25, pp.421-427   DOI   ScienceOn
10 Cho, H., Ryu, C. and Kim, Y., 2004, Experimental study on the performance of a $C0_2$ cycle in the cooling mode, Proceeding of the SAREK '04 Winter Annual Conference, pp. 554-559
11 Neksa, P., Rekstad, H., Zakeri, R and Schiefloe, P., 1998, $C0_2$ heat pump water heater: characteristics, system design and experimental results, Int. Journal of Refrigeration, Vol. 21, No.3, pp.172-179   DOI   ScienceOn
12 Hafner, A., 2000, Experimental study on heat pump operation of prototype $C0_2$ mobile air conditioning system, 4th IIR-Gustav Lorentzen Conference, pp. 177 -184
13 ASHRAE, 1983, Methods of testing for seasonal efficiency of unitary air-conditioner and heat pumps, ASRRAE Standard 116
14 Choi, J. and Kim, Y, 2004, Influence of the expansion device on the performance of a heat pump using R407C under a range of charging conditions, Int. Journal of Refrigeration, Vol. 27, pp.378-384   DOI   ScienceOn
15 Kim, D., Kim, Y. and Kim, M., 2004, Studies on the capacity control of a heat pump system using carbon dioxide as a working fluid, Proceeding of the SAREK '04 Winter Annual Conference, pp.517-522
16 Hrnjak, P., Richeter, M., Song, S., Kim, M. and Bullard, C., 2000, Transcritical $C0_2$ heat pump for residential application, 4th IIRGustav Lorentzen Conference, pp. 9-16