Improved research of simplified calculation method for heat transfer in the underground engineering envelope

It need fast and deficient calculation method for heat transfer in the underground engineering. Most foreign researchers give the simplified calculation formulas for heat transfer in the attached shallow underground engineering envelope. These formulas ignore the heat transfer of the enclosure to the surrounding rock and soil, and if applied to the deep additional underground engineering or the single-building shallow underground engineering, it will cause a certain amount of error. Improved research of simplified calculation method for heat transfer in the underground engineering envelope were based on shape factor and phase difference in this thesis, and the attached and the single-building underground engineering envelope for heat transfer were separated. And through comparative analysis of practical example and existing literature, it proves that the method can be applied to rapid calculation in engineering.