Browse > Article

Modelling of a High Efficiency Refrigeration System with Heat Storage for Reverse Cycle Hot Gas Defrost  

Ardiyansyah, Ardiyansyah (Graduate School, Chonnam National University)
Choi, Kwang-Il (Graduate School, Chonnam National University)
Oh, Jong-Taek (Dept. of Refrigeration and Air Conditioning Eng., Chonnam National University)
Oh, Hoo-Kyu (Dept. of Refrigeration and Air Conditioning Eng., Pukyong National University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.15, no.4, 2007 , pp. 175-181 More about this Journal
Abstract
A computer model of a high efficiency refrigeration system equipped with heat storage for reverse cycle-hot gas defrost (the stored heat is used during defrost cycle of the system) is presented. The model was developed based on both theoretical and empirical equations for the compressor, evaporator, condenser and the heat storage equipment. Simulations of the prototype system were carried out to investigate refrigeration system performance under various operating conditions during refrigeration cycles. The simulations of the evaporator during defrost cycles at 30 and $40^{\circ}C$ hot gas refrigerant temperature were also performed which resulted on shorter defrost time but only slight increase in defrost efficiency. These information on energy efficiency and the defrost time required are important in order to avoid excessive parasitic load and temperature rise of the refrigerated room.
Keywords
Heat Storage; Refrigeration system; Performance; Simulation; Reverse cycle; Hot gas Defrost;
Citations & Related Records
연도 인용수 순위
  • Reference
1 O'Neal, D.L., Peterson K.T., Anand N.K., Schliesing J.S., 1989. 'Refrigeration System Dynamics During the reverse Cycle Defrost', ASHRAE Trans. 95: 689-698
2 Browne, M.W., P.K. Bansal, 2002. 'Transient Simulation of Vapor-Compression Package Liquid Chillers' Int. J. Refrig. 25: 597-610   DOI   ScienceOn
3 Cole, R.A., 1989, Refrigeration Loads in a Freezer Due to Hot Gas Defrost and Their Associated Costs, ASHRAE Trans. 95(2): 1149-1154
4 Jolly, P.G., Tso, C.P., Wong, Y.W. and Ng, A.M., 2000, Simulation and Measurement on the Full Load Performance of Refrigeration System in a Shipping Container, Int. J. Refrig. 23: 112-126   DOI   ScienceOn
5 Boeis A.M., K.O. Homan, J.H. Davidson, Wei Liu, 2005. 'A Variable Effectiveness Model for Indirect Thermal Storage Devices' Proc. of ASME Summer Heat Trans. Conference' HT2005-72711 Research 25: 859-880
6 D.J. Swider, M.W. Browne, P.K. Bansal, V. Kecman, 2001. 'Modeling of Vapor- Compression Liquid Chillers with Neural Networks', App. Thermal Eng. 21: 311-329   DOI   ScienceOn
7 Wang, Chi-Chuan, Kuan-Yu Chi, Chun-Jung Chang, 2000, Heat Trasfer and Friction Characteristics of Plain fin-and-tube Heat Exchangers, part II: Correlation, Int. J. of Heat and Mass Trans. 43: 2693-2700   DOI   ScienceOn
8 Hoffenbecker, N., Klein, S.A., Reindl, D.T., 2005, Hot Gas Defrost Model Development and Validation, Int. J. Refrig. 28: 605-615   DOI   ScienceOn
9 Gungor, K.E., & Winterton, R.H.S., 1987, Simplified General Correlation for Saturated Flow Boiling and Comparisons of Correlations with Data, Chem. Eng. Research and Design 65: 148-156
10 Incropera, Frank. P. and David P. DeWitt 1990, Fundamental of Heat and Mass Transfer 3rd ed., Wiley and Son, Singapore
11 Koury, R.N.N., L. Machado and K.A.R. Ismail, 2001, 'Numerical Simulation of A Variable Speed Refrigeration System', Int. J. Refrig. 24: 192-200   DOI   ScienceOn
12 Krakow, K.I., S.Lin, L. Yan, 1992, A Model of Hot-Gas Defrosting of Evaporators, ASHRAE Trans. 98(1): 451-474