Optimization of totally irreversible refrigerators and heat pumps

El-Din, M.M. Salah

doi:10.1016/s0196-8904(98)00105-8

Cited by 30 publications

(2 citation statements)

References 11 publications

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“…El-Din [31] maximized the cooling load, for given COP, by analyzing the totally irreversible refrigerator for total heat transfer area constraint and found similar expression for an optimum balance between the sizes of the heat exchangers at the hot and cold ends of the machine. The following correlations were derived for heat transfer surface area ratio distribution for cold and hot ends:…”

Section: H Lmentioning

confidence: 90%

A review on thermodynamic optimization of irreversible refrigerator and verification with transcritical CO2 system

Sarkar¹

2014

International Journal of Thermodynamics

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The transcritical vapor compression refrigeration cycle consists of isothermal heat addition process and isobaric non-isothermal heat rejection process with highly variable heat capacity unlike to the subcritical cycle. Hence, it is quite interesting whether the analysis and optimization results of irreversible Carnot-like refrigerator are applicable for this case. The present study consists of two parts: the detailed review on theoretical analysis and analytical optimizations of irreversible Carnot-like refrigerator with both infinite and finite capacity heat reservoirs, and verification of analytical results with the results obtained from a more elaborate numerical simulation of transcritical CO 2 refrigeration system. Considered objective parameters are cooling load or COP and overall heat transfer surface area, and optimizing parameters are cold and hot side working fluid temperatures, ratio of residence times for heat addition and heat rejection, and heat transfer surface area ratio. Reasonably fair agreement has been obtained between analytical and numerical model predictions.

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Section: H Lmentioning

confidence: 90%

A review on thermodynamic optimization of irreversible refrigerator and verification with transcritical CO2 system

Sarkar¹

2014

International Journal of Thermodynamics

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“…Chen et al (7) presented a steady-state flow model, which incorporates the internal irreversiblities caused by pipe friction and turbulence. Salah El-Din (8) used the ratio between the entropy differences of a working fluid at the hot and cold sides to represent the internal irreversibility, and derived a design rule of refrigerators. Recently, Hsieh and Chiou (9) used a heat by-pass model to represent the losses due to internal irreversibilities for a heat engine.…”

Section: Introductionmentioning

confidence: 99%

Internal Irreversibility Analysis and Optimization of a Refrigeration Plant

Chang

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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The present study develops a theoretical investigation on the optimal design of a refrigeration plant with considerations on both the external and internal irreversibilities. With the total heat transfer area constraint or the total thermal conductance constraint, the analytical solutions of optimal area-ratio and the corresponding maximum COP are obtained under a fixed cooling rate. The results show that the internal irreversibility can penalize the plant's COP, and the internal irreversibility has more significant effects on a freezing system than on an air-conditioning system. When there is no internal irreversibility, a special case of the analytical solution is exactly the same as that obtained from the previous study.

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Local stability analysis of a non-endoreversible refrigerator

Huang

Sun

2008

Applied Thermal Engineering

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Optimization of totally irreversible refrigerators and heat pumps

Cited by 30 publications

References 11 publications

A review on thermodynamic optimization of irreversible refrigerator and verification with transcritical CO2 system

A review on thermodynamic optimization of irreversible refrigerator and verification with transcritical CO2 system

Internal Irreversibility Analysis and Optimization of a Refrigeration Plant

Local stability analysis of a non-endoreversible refrigerator

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