Abstract
Pile heat exchanger has been developing rapidly in recent years and is an important research direction of ground source heat pump technology. This paper, from the aspects of principle structure, heat transfer model, numerical simulation, experimental study and engineering application and so on, sums up the domestic and overseas research status of pile heat exchangers in the construction industry and describes the laws and characteristics of heat transfer, underground soil temperature field and the factors impacting energy pile heat transfer. Pile heat exchanger has a variety of pipe laying methods, in which the spiral pipe-laying method can effectively increase the heat exchange area on the premise of security and reliability and has the best heat transfer efficiency. The paper also concludes the next step of research problems and development direction of pile heat exchanger technologies.
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