Influence of heat storage in non-heating season on operation of middle and deep buried tube heat exchanger
In order to alleviate the obvious decrease of heat extraction capacity and surrounding geotechnical temperature field caused by long-term operation of a buried pipe heat exchanger,the influence of heat storage in the non-heating season on the operation of middle and deep buried pipe heat exchanger was analyzed,and the influence of heat storage time,waste heat medium temperature,and circulating liquid mass flow rate on the operation of buried pipe at different depths was discussed.Through the establishment of a physical model and numerical model,the finite difference method is used to calculate the heat storage effect of the mid-deep buried tube heat exchanger in the non-heating season,and the heat extraction of the mid-deep buried tube heat exchanger under different heat storage conditions is compared and analyzed.The results show that with the increase of heat storage time,the temperature of waste heat medium and the mass flow rate of circulating liquid increase heat recovery.Under the same conditions,the heat extraction of a single-hole mid-deep buried pipe heat exchanger will increase in direct proportion with the increase of buried pipe depth.
middle and deep buried tubeheat exchangerheat storage in non-heating seasonheat extraction
万方数据
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