Yu, Z. and Hajabdollahi Ouderji, Z. (2023) A unified approach for the thermodynamic comparison of heat pump cycles. Communications Engineering, 2, 62. (doi: 10.1038/s44172-023-00112-0)
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Abstract
The flexible heat pump cycle introduces a heat storage device into the Evans-Perkins cycle to recover, store, and reuse part of the sensible heat carried by the hot liquid refrigerant from the condenser, achieving a higher coefficient of performance than the latter. In this paper, we develop a unified approach, namely cycle superposition to allow comparison of the flexible heat pump cycle with other performance-enhancing cycle layouts including two-stage cycles with intercooling, subcooling, flash gas removal, or their combinations. We show that under ideal conditions, the flexible heat pump cycle is thermodynamically similar to two-stage heat pump cycles with full subcooling or flash gas removal, but no intercooling. From the energy recovery perspective, the two-stage cycles recover and reuse some sensible heat carried by hot liquid refrigerant simultaneously using their high-stage compressor, whereas the flexible heat pump cycle decouples the recovery and reuse of such heat in time using a heat storage. However, the irreversible heat transfer via real heat exchangers during charging and discharging processes will reduce the benefits of the flexible heat pump cycle. The effectiveness of all these performance-enhancing methods strongly depends on the characteristics of refrigerants.
| Item Type: | Articles |
|---|---|
| Additional Information: | This work was mainly supported by EPSRC in the UK through the grant EP/V042033/1 and EP/T022701/1, but also benefited from other EPSRC grants EP/W027593/1, EP/V030515/1, EP/P028829/1, EP/N020472/1, EP/R003122/1, EP/W027593/1, and EP/N005228/1. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Hajabdollahi Ouderji, Dr Zahra and Yu, Professor Zhibin |
| Authors: | Yu, Z., and Hajabdollahi Ouderji, Z. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Communications Engineering |
| Publisher: | Nature Research |
| ISSN: | 2731-3395 |
| ISSN (Online): | 2731-339 |
| Copyright Holders: | Copyright © 2023 The Author |
| First Published: | First published in Communications Engineering 2:62 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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