In this paper, the mathematical physical model of the heat and moisture transfer in the single-U-tube heat exchanger of a ground source heat pump(GSHP) on well group is established and validated using observed data from the practical rock-soil thermal response test for a resident district in Taiyuan, water in soil is three-dimensional seepage flow and the soil is layered according to the geological structure in the depth direction. The dynamic load of the district for one year is input into the model. The temperature fields of well group are simulated numerically in the two conditions which convalescence periods are omitted or not. It shows that it rather necessary to take the influence of convalescence periods into consideration while predicting the soil temperature field of a GSHP system running for a long term.
The mathematical physical model of the heat and moisture transfer in the single-U-tube heat exchanger of a ground source heat pump (GSHP) is validated using observed data from the practical rock-soil thermal response test on a resident district in Taiyuan, the soil is layered according to the geological structure of an actual drill in the depth direction in this model. Inputting the dynamic design cooling and heating load of the district into the Realizable turbulent model in Fluent, the temperature fields of a single well in the GSHP project running for 1 year in 2 conditions in which convalescence is considered and not, are simulated numerically. It shows that it rather necessary to take the influence of convalescence into consideration while predicting the soil temperature field of a GSHP system running for a long term, or may not correspond to the reality and make a wrong theory guide to the practical engineering.
In this paper, the mathematical physical model of the heat and moisture transfer, which is about a vertical single-U-tube heat exchanger of a ground source heat pump (GSHP), is used to simulate the soil temperature fields inside drilling around a vertical single-U-tube ground source heat exchanger. The soil temperature fields inside drilling in the GSHP project running for one year are computed numerically. It shows that soil structure, cooling and heating load, cooling and heating period, and convalescence period have been determined by practical engineering conditions, the distance in the plane between drillings have a huge influence on heat transfer effect, only when the distance is designed reasonably, can it be possible to make sure normal heat transfer efficiency.
Through the example about the electrothermal boiler and heat storage system modification of Yuci cultural center of Shanxi Province, the paper introduces the design scheme and the characteristic of electrothermal boiler system, and compares the system operation cost with the central heating cost. It points out the technical advantages and economic value of the electrothermal heating boiler. above all, it has a very high environmental protection value.
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