Thermodynamic analysis of an R744-R717 cascade refrigeration system

By H. Getu, P. Bansal. 2008

249 citations recorded by the source corpus.

Abstract A thermodynamic analysis of carbon dioxide–ammonia (R744–R717) cascade refrigeration system is presented in this paper to optimize the design and operating parameters of the system. The design and operating parameters considered in this study include (1) condensing, subcooling, evaporating and superheating temperatures in the ammonia (R717) high-temperature circuit, (2) temperature difference in the cascade heat exchanger, and (3) evaporating, superheating, condensing and subcooling in the carbon dioxide (R744) low-temperature circuit. A multilinear regression analysis was employed in terms of subcooling, superheating, evaporating, condensing, and cascade heat exchanger temperature difference in order to develop mathematical expressions for maximum COP, an optimum evaporating temperature of R717 and an optimum mass flow ratio of R717 to that of R744 in the cascade system.

Subfields: Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/91b555c3cacf527e46debda2cac1433da055c60e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Mechanical Engineering

1. José Fernández-Seara
2. J. Dopazo

Citations in the corpus

• Experimental evaluation of a cascade refrigeration system prototype with CO2 and NH3 for freezing process applications (2011, methodology): “…Lee et al. (2006) calculate the isentropic efficiencies of each compressor as a function of its pressure ratios using second order equations, Getu and Bansal (2008) assume an isentropic efficiency constant and equal to 0.78, and Dopazo et al. (2009) estimate the indicated efficiency of the…”