Abstract
Taking an office building in Jinan as an example, the simulation model of solar inter-seasonal soil heat storage was established by TRNSYS software, and the variation law of ground temperature in the heat storage period was analyzed. From the perspective of ground temperature change, the influence of the spacing, length, number of drilling wells and area of solar collector on the heat storage effect was analyzed. The results showed that the soil temperature increased rapidly at the beginning of heat storage, and then the temperature rise rate gradually slowed down. The ground heat exchanger spacing, length, number of drilling and collector area will have a great influence on the solar energy seasonal heat storage effect. Therefore, in practical engineering applications, for the solar inter-seasonal soil heat storage system, the parameters of buried pipes, collectors and other components are recommended to be reasonably determined by simulation to obtain the optimal heat storage effect.
Highlights
The energy of ground source heat pump system comes from underground energy
When the local buried pipe spacing was 4.5 m, by August 31 ( 5880 h ), the average temperature rise rate of underground soil was 0.097 °C / d, compared with 0.0048 °C / d from September 1 ( 5881 h ) to October 31 ( 7344 h ). This is because the soil temperature is at a low level in the early stage of heat storage, and the temperature difference between the outlet water temperature of solar collector and the soil is large, which is conducive to the heat transfer on the soil side
An office building in Jinan is taken as an example to establish a solar inter-seasonal soil heat storage simulation model by TRNSYS software
Summary
The energy of ground source heat pump system comes from underground energy. The system does not emit any waste gas, waste water and waste residue to the outside world. Solar energy interseasonal soil heat storage is the combination of solar energy and ground source heat pump, that is, the use of soil in spring, summer, autumn three seasons more abundant solar energy into heat stored in the underground soil, winter heating season will be taken out to provide heat for buildings. This reduces the environmental pollution caused by building heating, and uses clean energy to alleviate energy pressure[2]. Storage effect is analyzed from the perspective of ground temperature change, aiming to provide a theoretical basis for the design and operation management of solar crossseasonal heat storage
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