Comparative analysis between constant pressure and constant temperature absorption processes for an intermittent solar refrigerator

M. A.I. El-Shaarawi; S. A.M. Said; M. U. Siddiqui

doi:10.1016/j.ijrefrig.2013.12.019

Comparative analysis between constant pressure and constant temperature absorption processes for an intermittent solar refrigerator

M. A.I. El-Shaarawi, S. A.M. Said^*, M. U. Siddiqui

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

This paper presents a detailed comparative analysis between constant pressure and constant temperature aqua-ammonia absorption processes for an intermittent solar refrigerator. The results of the analysis indicate that constant pressure processes results in as high as 20% increase in coefficient of performance compared to constant temperature processes. Also, the results indicate that there is a critical temperature below which both the constant pressure and constant temperature processes exhibit the same performance. Furthermore, it has been observed that the optimum generator temperature for constant pressure processes is approximately 12% higher than constant temperature processes. Finally, the effect of maintaining a constant temperature or constant pressure absorption processes on the heat duties of both, the absorber and the evaporator, is addressed in the paper.

Original language	English
Pages (from-to)	103-112
Number of pages	10
Journal	International Journal of Refrigeration
Volume	41
DOIs	https://doi.org/10.1016/j.ijrefrig.2013.12.019
State	Published - May 2014

Bibliographical note

Funding Information:
The authors would like to acknowledge the support of Centre of Research and Excellence - Renewable Energy (CoRE-RE) at King Fahd University of Petroleum and Minerals (KFUPM) as well as KACST in supporting the present study under project # 08-ENE56-04.

Keywords

Aqua-ammonia
Constant pressure absorption
Constant temperature absorption
Intermittent systems
Solar refrigerator

ASJC Scopus subject areas

Building and Construction
Mechanical Engineering

Access to Document

10.1016/j.ijrefrig.2013.12.019

Cite this

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title = "Comparative analysis between constant pressure and constant temperature absorption processes for an intermittent solar refrigerator",

abstract = "This paper presents a detailed comparative analysis between constant pressure and constant temperature aqua-ammonia absorption processes for an intermittent solar refrigerator. The results of the analysis indicate that constant pressure processes results in as high as 20% increase in coefficient of performance compared to constant temperature processes. Also, the results indicate that there is a critical temperature below which both the constant pressure and constant temperature processes exhibit the same performance. Furthermore, it has been observed that the optimum generator temperature for constant pressure processes is approximately 12% higher than constant temperature processes. Finally, the effect of maintaining a constant temperature or constant pressure absorption processes on the heat duties of both, the absorber and the evaporator, is addressed in the paper.",

keywords = "Aqua-ammonia, Constant pressure absorption, Constant temperature absorption, Intermittent systems, Solar refrigerator",

author = "El-Shaarawi, {M. A.I.} and Said, {S. A.M.} and Siddiqui, {M. U.}",

note = "Funding Information: The authors would like to acknowledge the support of Centre of Research and Excellence - Renewable Energy (CoRE-RE) at King Fahd University of Petroleum and Minerals (KFUPM) as well as KACST in supporting the present study under project # 08-ENE56-04.",

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AU - El-Shaarawi, M. A.I.

AU - Said, S. A.M.

AU - Siddiqui, M. U.

N1 - Funding Information: The authors would like to acknowledge the support of Centre of Research and Excellence - Renewable Energy (CoRE-RE) at King Fahd University of Petroleum and Minerals (KFUPM) as well as KACST in supporting the present study under project # 08-ENE56-04.

PY - 2014/5

Y1 - 2014/5

N2 - This paper presents a detailed comparative analysis between constant pressure and constant temperature aqua-ammonia absorption processes for an intermittent solar refrigerator. The results of the analysis indicate that constant pressure processes results in as high as 20% increase in coefficient of performance compared to constant temperature processes. Also, the results indicate that there is a critical temperature below which both the constant pressure and constant temperature processes exhibit the same performance. Furthermore, it has been observed that the optimum generator temperature for constant pressure processes is approximately 12% higher than constant temperature processes. Finally, the effect of maintaining a constant temperature or constant pressure absorption processes on the heat duties of both, the absorber and the evaporator, is addressed in the paper.

AB - This paper presents a detailed comparative analysis between constant pressure and constant temperature aqua-ammonia absorption processes for an intermittent solar refrigerator. The results of the analysis indicate that constant pressure processes results in as high as 20% increase in coefficient of performance compared to constant temperature processes. Also, the results indicate that there is a critical temperature below which both the constant pressure and constant temperature processes exhibit the same performance. Furthermore, it has been observed that the optimum generator temperature for constant pressure processes is approximately 12% higher than constant temperature processes. Finally, the effect of maintaining a constant temperature or constant pressure absorption processes on the heat duties of both, the absorber and the evaporator, is addressed in the paper.

KW - Aqua-ammonia

KW - Constant pressure absorption

KW - Constant temperature absorption

KW - Intermittent systems

KW - Solar refrigerator

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DO - 10.1016/j.ijrefrig.2013.12.019

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JF - International Journal of Refrigeration

ER -

Comparative analysis between constant pressure and constant temperature absorption processes for an intermittent solar refrigerator

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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