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http://hdl.handle.net/10397/61446
Title: | A new analytical solution for horizontal geothermal heat exchangers with vertical spiral coils | Authors: | Wang, D Lu, L Cui, P |
Issue Date: | Sep-2016 | Source: | International journal of heat and mass transfer, Sept. 2016, v. 100, p. 111-120 | Abstract: | Horizontal geothermal heat exchangers (HGHEs) with vertical spiral coils have been increasingly used in ground source heat pump (GSHP) systems. Research studies have been conducted using field tests and simulations trying to reveal the heat transfer mechanism of HGHEs with vertical spiral coils and to provide a good heat transfer performance. However, there is no analytical solution has been established for HGHEs with vertical spiral coils. Of particular interest is the temperature variation at the soil surface. The study presented in this paper proposes the development of a mathematical vertical ring-coil model used to describe the heat transfer process of HGHEs with vertical spiral coils. In this new model, the spiral heat exchanger is simplified as a series of ring coils that inject/extract heat in/from a semi-infinite medium. A single ring model in an infinite medium is first introduced. Using images and superposition, a multiple ring-coils analytical solution is then given. The significant influence on the heat transfer performance of HGHEs temperature variation of the ground surface is then considered. A periodically changed boundary condition is being taken into consideration in the modeling process. The validity of the model was examined by a field test and a 3-D simulation model. The analytical solutions may provide a desirable and better tool for the simulation/design HGHEs with vertical spiral coils. | Keywords: | Analytical solution Ground-coupled heat pump Heat transfer Spiral heat exchanger |
Publisher: | Pergamon Press | Journal: | International journal of heat and mass transfer | ISSN: | 0017-9310 | EISSN: | 1879-2189 | DOI: | 10.1016/j.ijheatmasstransfer.2016.04.001 | Rights: | © 2016 Elsevier Ltd. All rights reserved © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ The following publication Wang, D., Lu, L., & Cui, P. (2016). A new analytical solution for horizontal geothermal heat exchangers with vertical spiral coils. International Journal of Heat and Mass Transfer, 100, 111-120 is available at https://doi.org/10.1016/j.ijheatmasstransfer.2016.04.001. |
Appears in Collections: | Journal/Magazine Article |
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