Second-law-based thermodynamic analysis of hot-gas, by-pass, capacity-control schemes for refrigeration and air-conditioning systems

M. Yaqub; Syed M. Zubair; Shamsul Hoda Khan

doi:10.1016/0360-5442(94)00091-G

Second-law-based thermodynamic analysis of hot-gas, by-pass, capacity-control schemes for refrigeration and air-conditioning systems

M. Yaqub, Syed M. Zubair^*, Shamsul Hoda Khan

^*Corresponding author for this work

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

22 Scopus citations

Abstract

The automatic hot-gas by-pass technique is applied to reduce the capacity of refrigeration and air-conditioning systems when operating at part load. In this scheme, hot gas from the compressor is extracted and injected into the suction side of the compresor through a hot-gas by-pass valve. Thus, the refrigerant gas by-passes the evaporator and reduces the system capacity. In this paper, three hot-gas, by-pass schemes for HFC-134a are discussed ad analyzed on the basis of the first and second laws of thermodynamics. A comparative study is performed of the schemes in terms of the system coefficient of performance (COP) and irreversible component losses. Second-law-based thermodynamic analysis indicates that the total irreversible losses of the by-pass valve increase substantially as the capacity decreases.

Original language	English
Pages (from-to)	483-493
Number of pages	11
Journal	Energy
Volume	20
Issue number	6
DOIs	https://doi.org/10.1016/0360-5442(94)00091-G
State	Published - Jun 1995

Bibliographical note

Funding Information:
Acknowledgement--The authors acknowledge support provided by King Fahd University of Petroleum and Minerals for this research project.

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Pollution
Mechanical Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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Cite this

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title = "Second-law-based thermodynamic analysis of hot-gas, by-pass, capacity-control schemes for refrigeration and air-conditioning systems",

abstract = "The automatic hot-gas by-pass technique is applied to reduce the capacity of refrigeration and air-conditioning systems when operating at part load. In this scheme, hot gas from the compressor is extracted and injected into the suction side of the compresor through a hot-gas by-pass valve. Thus, the refrigerant gas by-passes the evaporator and reduces the system capacity. In this paper, three hot-gas, by-pass schemes for HFC-134a are discussed ad analyzed on the basis of the first and second laws of thermodynamics. A comparative study is performed of the schemes in terms of the system coefficient of performance (COP) and irreversible component losses. Second-law-based thermodynamic analysis indicates that the total irreversible losses of the by-pass valve increase substantially as the capacity decreases.",

author = "M. Yaqub and Zubair, \{Syed M.\} and Khan, \{Shamsul Hoda\}",

note = "Funding Information: Acknowledgement--The authors acknowledge support provided by King Fahd University of Petroleum and Minerals for this research project.",

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AU - Yaqub, M.

AU - Zubair, Syed M.

AU - Khan, Shamsul Hoda

N1 - Funding Information: Acknowledgement--The authors acknowledge support provided by King Fahd University of Petroleum and Minerals for this research project.

PY - 1995/6

Y1 - 1995/6

N2 - The automatic hot-gas by-pass technique is applied to reduce the capacity of refrigeration and air-conditioning systems when operating at part load. In this scheme, hot gas from the compressor is extracted and injected into the suction side of the compresor through a hot-gas by-pass valve. Thus, the refrigerant gas by-passes the evaporator and reduces the system capacity. In this paper, three hot-gas, by-pass schemes for HFC-134a are discussed ad analyzed on the basis of the first and second laws of thermodynamics. A comparative study is performed of the schemes in terms of the system coefficient of performance (COP) and irreversible component losses. Second-law-based thermodynamic analysis indicates that the total irreversible losses of the by-pass valve increase substantially as the capacity decreases.

AB - The automatic hot-gas by-pass technique is applied to reduce the capacity of refrigeration and air-conditioning systems when operating at part load. In this scheme, hot gas from the compressor is extracted and injected into the suction side of the compresor through a hot-gas by-pass valve. Thus, the refrigerant gas by-passes the evaporator and reduces the system capacity. In this paper, three hot-gas, by-pass schemes for HFC-134a are discussed ad analyzed on the basis of the first and second laws of thermodynamics. A comparative study is performed of the schemes in terms of the system coefficient of performance (COP) and irreversible component losses. Second-law-based thermodynamic analysis indicates that the total irreversible losses of the by-pass valve increase substantially as the capacity decreases.

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U2 - 10.1016/0360-5442(94)00091-G

DO - 10.1016/0360-5442(94)00091-G

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JF - Energy

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ER -

Second-law-based thermodynamic analysis of hot-gas, by-pass, capacity-control schemes for refrigeration and air-conditioning systems

Abstract

Bibliographical note

ASJC Scopus subject areas

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