저온영역에서 운전조건 변화에 따른 2단압축 냉동시스템과 2원 냉동시스템의 성능 분석
Performance Analysis of Two-stage Compression Refrigeration System and Cascade Refrigeration System According to Changes in Operating Conditions in Low Temperature Range
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The operating parameters considered in this study include evaporating and condensing temperature, degree of subcooling and degree of superheating. in R744-R717 cascade refrigeration system and R744 two-stage compression refrigeration system with the range of low temperature -50℃∼-30℃. The coefficient of performance(COP) of R744-R717 cascade refrigeration system is about 16∼20% greater than that of R744 two-stage compression refrigeration system in the range of evaporation temperature of -50℃∼-30℃. R744 two-stage compression refrigeration system is unstable because its coefficient of performance changes significantly depending on the evaporating temperature and total compression work, and compression efficiency decreases. In this case, not efficient for long-term use. Whereas R744-R717 R744-R717 is a cascade refrigeration system using eco-friendly refrigerants. And this system is a high-efficiency refrigeration system that performs well even under various operating conditions. This is why it can be configured by selecting a refrigerant suitable for the high temperature side and the low temperature side.
Abstract
The operating parameters considered in this study include evaporating and condensing temperature, degree of subcooling and degree of superheating. in R744-R717 cascade refrigeration system and R744 two-stage compression refrigeration system with the range of low temperature -50℃∼-30℃. The coefficient of performance(COP) of R744-R717 cascade refrigeration system is about 16∼20% greater than that of R744 two-stage compression refrigeration system in the range of evaporation temperature of -50℃∼-30℃. R744 two-stage compression refrigeration system is unstable because its coefficient of performance changes significantly depending on the evaporating temperature and total compression work, and compression efficiency decreases. In this case, not efficient for long-term use. Whereas R744-R717 R744-R717 is a cascade refrigeration system using eco-friendly refrigerants. And this system is a high-efficiency refrigeration system that performs well even under various operating conditions. This is why it can be configured by selecting a refrigerant suitable for the high temperature side and the low temperature side.
참고문헌 (18)
- I. Wilson, "Carbon dioxide for use as a refrigeranf, In* Refrigeration Science and Technology", Proceedings, IIR-IRHACE Conference, Innovative Equipment and Systems for Comfort and Food Preservation, pp.305~311 (2006), The University of Auckland
- G. N. Roh, "Prediction on performance of Cascade Refrigeration System using alternative freon Refrigerants", Journal of Korean Society of Mechanical Technology, 13(1), pp.73~79 (2011)
- S. N. Park, "Experiment and simulation on the performance of an autocascade refrigeration system using carbon dioxide as a refrigeranf", pp.1999
- P. K. Bansal, "Cascade systems： past, present, and future", ASHRAE Trans, 113(1), pp.245~252 (2007)
- T. S. Lee, "Thermodynamic analysis of optimal condensing temperature of cascade condenser in CO2", NH3 cascade refrigeration systems, 2006, pp.29, 1100~1108
- S. Bhattacharyya, "Optimization of a CO2-C3H8 cascade system for refrigeration and heating", Int J. Refrigeration, 28, pp.1284~1292 (2005)
- J. A. Dopazo, "Theoretical analysis of a CO2-NH3 cascade refrigeration system for cooling applications at low temperatures", Applied Thermal Engineering, 29, pp.1577~1583 (2009)
- G. D. Nicola, "Performance of cascade cycles working with blends of CO2+ natural refrigerants", International Journal of Refrigeration, 34, pp.1436~1445 (2011)
- M. Aminyavari, "Energetic, economic and environ-mental(3E)analyses, and multiobjective optimization of a CO2-NH3 cascade refrigeration system", Applied Thermal Engineering, 65, pp.42~50 (2014)
- R. Yun, "Evaluation of the performance for the cascade system and the two-stage systems", Proceedings of the SAREK, Summer Annual Conference, pp.10-S-144~ (2010)
- M. Likitthammanit, "Experimental investigation of CO2", NH3 cascade and transcritical refrigeration systems in supermarkets, 2007
- Y. Hwang, "Options for two-stage transcritical carbon dioxide cycle", 5th IIR-Gustav Lorentzen on Natural Working Fluids Conference, pp.143~149 (2002)
- A. Messineo, "744-R717 Cascade Refrigeration System : Performance evaluation compared with a HFC two-stage system", Energy Procedia, 14, pp.56~65 (2012)
- H. Cho, "Experimental study on the cooling performance improvement of a two-stage compression CO2 cycle", Korean Journal ofAir-conditioning and Refrigeration, 18(10), pp.835~841 (2006)
- fChart Software Inc., "Engineering Equation two-stage system", Energy Procedia, 14, pp.56~65 (2012)
- H Huff, "Options for two-stage transcritical CO2 cycle", 5th IIR-Gustav Lorentzen on Natural Working Fluids Conference, pp.143~149 (2002)
- Comparative Assessment of a Cascade Refrigeration Cycle with Different Refrigerant Pair, "A. Hiren", NIRMA University, 8~10, pp.AHMEDABAD-382 481 (2011)
- H. M. Getu, "Thermodynamic analysis of an R744-R717 cascade refrigeration system", International Journal of Refrigeration, 31, pp.45~54 (2008)