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Title: Countercurrent heat exchangers with both fluids subjected to external heating

Abstract

A mathematical model was developed to study the performance of a counterflow heat exchanger in which both fluid streams are exposed to external heating. It was found that under the external heat transfer condition, the effectiveness of the heat exchanger was drastically reduced. The hot fluid temperature effectiveness increased as the external thermal conductance ratios, R{sub h} and R{sub c}, decreased. For effective operation and to avoid temperature cross, there exist a maximum possible NTU for a given R{sub h} and R{sub c}.

Authors:
;
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (US)
OSTI Identifier:
20001220
Alternate Identifier(s):
OSTI ID: 20001220
Resource Type:
Journal Article
Journal Name:
Heat Transfer Engineering
Additional Journal Information:
Journal Volume: 20; Journal Issue: 3; Other Information: PBD: Jul-Sep 1999; Journal ID: ISSN 0145-7632
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; HEAT EXCHANGERS; PERFORMANCE; COUNTERFLOW SYSTEMS; MATHEMATICAL MODELS

Citation Formats

Ameel, T.A., and Hewavitharana, L. Countercurrent heat exchangers with both fluids subjected to external heating. United States: N. p., 1999. Web. doi:10.1080/014576399271402.
Ameel, T.A., & Hewavitharana, L. Countercurrent heat exchangers with both fluids subjected to external heating. United States. doi:10.1080/014576399271402.
Ameel, T.A., and Hewavitharana, L. Wed . "Countercurrent heat exchangers with both fluids subjected to external heating". United States. doi:10.1080/014576399271402.
@article{osti_20001220,
title = {Countercurrent heat exchangers with both fluids subjected to external heating},
author = {Ameel, T.A. and Hewavitharana, L.},
abstractNote = {A mathematical model was developed to study the performance of a counterflow heat exchanger in which both fluid streams are exposed to external heating. It was found that under the external heat transfer condition, the effectiveness of the heat exchanger was drastically reduced. The hot fluid temperature effectiveness increased as the external thermal conductance ratios, R{sub h} and R{sub c}, decreased. For effective operation and to avoid temperature cross, there exist a maximum possible NTU for a given R{sub h} and R{sub c}.},
doi = {10.1080/014576399271402},
journal = {Heat Transfer Engineering},
issn = {0145-7632},
number = 3,
volume = 20,
place = {United States},
year = {1999},
month = {9}
}