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Design and analysis of a novel dual source vapor injection heat pump using exhaust and ambient air

Li, Jing; Fan, Yi; Zhao, Xudong; Bai, Xiaoman; Zhou, Jinzhi; Badiei, Ali; Myers, Steve; Ma, Xiaoli

Authors

Yi Fan

Xiaoman Bai

Jinzhi Zhou



Abstract

A novel dual source vapor injection heat pump (DSVIHP) using exhaust and ambient air is proposed. The air exhausted from the building first releases energy to the medium-pressure evaporator and is then mixed with the ambient air to heat the low-pressure evaporator. A vapor injection (VI) compressor of two inlets is connected with the low and medium pressure evaporators. It's first time that a VI compressor is employed to recover the ventilation heat. The system can minimize the ventilation heat loss and provide a unique defrosting approach by using the exhaust waste heat. Fundamentals of the proposed DSVIHP are illustrated. Mathematical models are built. Both energetic and exergetic analyses are carried out under variable conditions. The results indicate that the DSVIHP has superior thermodynamic performance. The superiority is more appreciable at a lower ambient temperature. It has a higher COP than the conventional vapor injection heat pump and air source heat pump by 11.3% and 23.2% respectively at an ambient temperature of -10 °C and condensation temperature of 45 °C. The waste heat recovery ratio from the exhaust air is more than 100%. The novel DSVIHP has great potential in the cold climate area application.

Citation

Li, J., Fan, Y., Zhao, X., Bai, X., Zhou, J., Badiei, A., …Ma, X. (2021). Design and analysis of a novel dual source vapor injection heat pump using exhaust and ambient air. Energy and Built Environment, https://doi.org/10.1016/j.enbenv.2020.11.004

Journal Article Type Article
Acceptance Date Nov 18, 2020
Online Publication Date Nov 26, 2020
Publication Date 2021
Deposit Date Feb 20, 2021
Publicly Available Date Apr 1, 2021
Journal Energy and Built Environment
Print ISSN 2666-1233
Publisher Elsevier
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1016/j.enbenv.2020.11.004
Keywords Dual source vapor injection heat pump; Exhaust air; Waste heat recovery; COP; Defrosting
Public URL https://hull-repository.worktribe.com/output/3667753
Publisher URL https://www.sciencedirect.com/science/article/pii/S2666123320301112?via%3Dihub

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Publisher Licence URL
https://creativecommons.org/licenses/by-nc-nd/4.0/

Copyright Statement
Copyright © 2020 Southwest Jiatong University. Publishing services by Elsevier B.V. on behalf of KeAi Communication Co. Ltd. This version is made available under the CC-BY-NC-N D 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/



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