Experimental Study on Heat Transfer of Supercritical C[O.sub.2] in a Tri-Partite Brazed Plate Gas Cooler

A transcritical carbon dioxide (C[O.sub.2]) heat pump test facility is developed to study the heat transfer performance of supercritical C[O.sub.2] cooled in a tri-partite braced plate gas cooler. The gas cooler is partitioned to separately serve the functions of domestic water preheating, space hea...

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Bibliographic Details
Published in:ASHRAE transactions 2022-07, Vol.128 (2), p.597
Main Authors: Zendehboudi, Alireza, Ye, Zuliang, Hafner, Armin
Format: Article
Language:English
Subjects:
Carbon dioxide
Design and construction
Heat pumps
Materials
Online Access:Get full text
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Summary:A transcritical carbon dioxide (C[O.sub.2]) heat pump test facility is developed to study the heat transfer performance of supercritical C[O.sub.2] cooled in a tri-partite braced plate gas cooler. The gas cooler is partitioned to separately serve the functions of domestic water preheating, space heating, and domestic water reheating. The effects of C[O.sub.2] inlet pressure, C[O.sub.2] and water mass flow rates, and water inlet temperature are investigated. As shown by the experimental results, the heat transfer coefficient increases with the increase of C[O.sub.2] mass flow rate, and the operating pressure has a considerable impact on the heat transfer coefficients in the near-critical region. The maximum of heat transfer appears near the pseudo-critical point and the peak of the heat transfer coefficient shifts to the high-temperature state when the operating pressure increases. Furthermore, no significant and clear influence of the water inlet temperature is demonstrated when C[O.sub.2] is in a high-temperature state.
ISSN:0001-2505