Exergy analysis of a two-stage refrigeration cycle using two natural substitutes of HCFC22

Ouadha, Ahmed; En-nacer, Mohammed; Adjlout, Lahouari; Imine, Omar

doi:10.1504/ijex.2005.006430

Cited by 28 publications

(22 citation statements)

References 11 publications

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“…The results indicate that R507A is a better substitute to R502 than R404A. The efficiency defect in condenser is highest and lowest in liquid vapour heat exchanger for the refrigerants considered [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a Two Stage Vapour Compression Refrigeration System Utilizing the Waste Heat of the Intercooler for Water Heating

Anjum¹,

Gupta²,

Ansari³

et al. 2017

J Fundam Renewable Energy Appl

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This article focuses on the various aspect of use of waste heat from intercooler of a multi-stage vapor compression refrigeration system using ammonia as a refrigerant. Energy and exergy analysis of the multi-stage refrigeration system having an intercooler is performed. The COP of such a system is found to be increased by 4 to 5%, and calculated to be approximately 3.24. Heat recovery through the intercooler proved to be beneficial as the COP of the system is improved along with heat recovery of 20 kJ/s. The analysis can represent a physical system where water can be heated through the heat extracted from the intercooler.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a Two Stage Vapour Compression Refrigeration System Utilizing the Waste Heat of the Intercooler for Water Heating

Anjum¹,

Gupta²,

Ansari³

et al. 2017

J Fundam Renewable Energy Appl

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“…The Exergy Analysis method, when applied to two-stage vapour compression cycles, was intended to find the value of the intermediate pressure that maximises the COP of the cycle (Ouadha et al, 2005), basically in booster-type configurations, thus results of the exergy analysis of a two-stage refrigeration system operating between a constant evaporating temperature of -30°C and condensation temperatures of 30°C, 40°C, 50°C and 60°C with two natural substitutes of HCFC22, namely propane (R290) and ammonia (R717), as working fluids were presented. The study was performed theoretically on a cycle with an open heat exchanger (flash intercooling).…”

Section: Introductionmentioning

confidence: 99%

Second-law analysis of two-stage vapour compression refrigeration plants

Torrella¹,

Llopis²,

Cabello³

et al. 2010

IJEX

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This paper describes a Second Law Analysis based on experimental data of a two-stage vapour compression facility driven by a compound compressor for medium and low-capacity refrigeration applications, which operates with the most usual inter-stage configurations (direct liquid injection and subcooler). The experimental analysis is performed for an evaporating temperature range between -36ºC and -20ºC and for a condensing temperature range between 30ºC and 47ºC using the refrigerant R-404A. The final results are compared with energy analysis from previous works. Additionally, a new criterion of equivalence between the simple vapour compression cycle and the two-stage compression cycle is given.

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“…Several methods *Correspondence to: Akhilesh Arora, Department of Mechanical Engineering, Delhi College of Engineering, Delhi 110042, India. y E-mail: prof_akhilesh_arora@yahoo.co.in of selecting the inter-stage pressure exist in the literature [2]. Threlkeld [3] demonstrated that for two-stage refrigeration cycles, the optimum interstage pressure is much different than the geometric mean pressure.…”

Section: Introductionmentioning

confidence: 99%

“…It was revealed that this method gives better results than geometric mean method for evaluation of inter-stage temperature. Ouadha et al [2] carried out the exergy analysis of a twostage refrigeration cycle using ammonia and propane. They found that the optimum inter-stage pressure for a two-stage refrigeration system is very close to the saturation pressure corresponding to the arithmetical mean of the refrigerant condensation and evaporation temperatures.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of a two-stage vapour compression refrigeration system

Arora

Kaushik

2009

Int. J. Energy Res.

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SUMMARYIn this paper exergy analysis of two-stage vapour compression refrigeration (VCR) system has been carried out with an objective to evaluate optimum inter-stage temperature (pressure) for refrigerants HCFC22, R410A and R717. A thermodynamic model based on the principles of mass, energy and exergy balances is developed for this purpose. The computed results illustrate the effects of evaporation and condensation temperatures, isentropic efficiencies of compressors, sub-cooling of refrigerant and superheating of suction vapour on optimum inter-stage saturation temperature (pressure). The optimum inter-stage saturation temperatures (pressures) for HCFC22 and R410A are proximate to arithmetic mean of evaporation and condensation temperatures (AMT) when assuming superheating of suction vapour and non-isentropic compression processes in low-pressure and high-pressure compressors. The optimum inter-stage saturation temperatures (pressures) for HCFC22 and R410A are near to geometric mean of evaporation and condensation temperatures (GMT) when it is assumed that cycle involves the effects of sub-cooling, superheating of suction vapour and non-isentropic compression of the suction vapour. The optimum inter-stage saturation temperature (pressure) for R717 is close to GMT irrespective of sub-cooling, superheating of suction vapour and non-isentropic compression in the cycle. The efficiency defects, computed corresponding to optimum inter-stage temperature in condenser is higher in comparison to the other components. Finally, it is deduced that R717 is a better alternative refrigerant to HCFC22 than R410A in two-stage VCR system.

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Exergy analysis of a two-stage refrigeration cycle using two natural substitutes of HCFC22

Cited by 28 publications

References 11 publications

Thermodynamic Analysis of a Two Stage Vapour Compression Refrigeration System Utilizing the Waste Heat of the Intercooler for Water Heating

Thermodynamic Analysis of a Two Stage Vapour Compression Refrigeration System Utilizing the Waste Heat of the Intercooler for Water Heating

Second-law analysis of two-stage vapour compression refrigeration plants

Energy and exergy analyses of a two-stage vapour compression refrigeration system

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