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Energy and exergy analysis and optimization studies of a CO2/NH3 cascade refrigeration system.

Number: pap. n. 45

Author(s) : YILMAZ B., ERDONMEZ N., ÖZYURT A., et al.

Summary

The harmful effects of synthetic refrigerants on ozone depletion result in replacing them with natural refrigerants such as carbon dioxide. Carbon dioxide (CO2) may be used in a single trans-critical cycle or it may be utilized as a refrigerant of the low temperature cycle of a cascade system. In such cascade systems, as a promising method, ammonia may be used in the high temperature cycle side. In this study, thermodynamic analysis of a cascade refrigeration system using CO2 (R744) and NH3 (R717) refrigerants in the low and high temperature cycles is presented. The energy and exergy analysis of the system with its components are performed to determine optimum operating conditions for condensing and evaporation temperature of the cascade condenser. The coefficient of performance is calculated using the developed numerical model in Engineering Equation Solver (EES) software. The linear regression method is applied to obtain optimum cascade condensing temperatures for different operating conditions.

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Pages: 8 p.

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Details

  • Original title: Energy and exergy analysis and optimization studies of a CO2/NH3 cascade refrigeration system.
  • Record ID : 30014680
  • Languages: English
  • Source: 6th Conference on Ammonia and CO2 Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 16-18, 2015.
  • Publication date: 2015/04/16

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