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Numerical study on the heat and mass transfer characteristics of the open-type cross-flow heat-source tower at low ambient temperature
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Fluid and Climate Technology.ORCID iD: 0000-0001-7321-8594
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
2019 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 145, article id 118756Article in journal (Refereed) Published
Abstract [en]

The heat-source tower heat pump (HTHP) has the advantage in preventing frosting and efficiently absorbing heat from the air in winter. Due to the low air humidity in low temperature environment (less than 0 °C), the latent heat exchange between the antifreeze solution and air is a key factor affecting the performance of HTHP. In this paper, a mathematical prediction model is established to investigate the heat and mass transfer characteristics of the heat-source tower (HST) in low temperature environment. It is found that the air temperature can be lower than the corresponding solution temperature in certain areas of HST when the inlet air-solution temperature difference is very small. Under the condition of the average heat transfer temperature difference of 5 °C, there is no significant reduction in the heat transfer when the ambient temperature drops from 0 °C to −15 °C, and the latent heat ratio is 25% and 50% at the ambient temperature of −15 °C and 0 °C respectively. The relationships between the optimum liquid-to-gas ratio of HST and the operation parameters of air and solution are also studied. The results show that air temperature, solution temperature and solution mass concentration have influences on the optimal liquid-to-gas ratio, whereas air relative humidity has no effect. This paper concludes that the latent heat has a significant impact on the heat transfer. A great amount of heat can be transferred from the air to the solution in HST by adjusting and optimizing the operation parameters in low temperature environment.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 145, article id 118756
Keywords [en]
Heat and mass transfer, HST, Low ambient temperature, Mathematical calculating model, Optimum liquid-to-gas ratio, Antifreeze solutions, Atmospheric temperature, Heat transfer, Latent heat, Calculating model, Corresponding solutions, Liquid-to-gas ratio, Low ambient temperatures, Low temperature environment, Mathematical prediction models, Temperature differences, Mass transfer
National Category
Climate Research Other Civil Engineering
Research subject
Civil and Architectural Engineering, Fluid and Climate Theory
Identifiers
URN: urn:nbn:se:kth:diva-263466DOI: 10.1016/j.ijheatmasstransfer.2019.118756ISI: 000494883600041Scopus ID: 2-s2.0-85072578584OAI: oai:DiVA.org:kth-263466DiVA, id: diva2:1375448
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-17Bibliographically approved

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Wang, Cong

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