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            暖通空調雜志社>期刊目次>2021年>第7期

            不同多孔介質及地下水源熱泵運行方式對采能區熱貫通的影響

            Influence of different porous media and groundwater-source heat pump operation modes on thermal breakthrough in energy extraction area

            那威 夏秋陽
            北京建筑大學

            摘要:

             為研究不同多孔介質對地下水源熱泵采能區溫度場的影響,建立了地下含水層水熱耦合模型,對地下水源熱泵在5種多孔介質條件下運行時地下溫度場的變化進行了模擬分析,根據發生熱貫通的時間及回灌水的溫度擴散程度提出了合理井距和優化運行模式。結果表明:在地下水自然橫流自抽水井一側流向回灌井的條件下,細砂最易發生熱貫通,其次為中砂、中粗砂,粗砂和砂礫最不易發生熱貫通;回灌水熱影響半徑隨著滲透系數增大而減小的明顯程度由大到小為粗砂、中粗砂、砂礫、中砂、細砂,但砂礫熱影響半徑明顯小于其他多孔介質;由擬合曲線可得出不同多孔介質在不同滲透系數下的合理井距;以大溫差小流量模式運行有助于緩解或避免熱貫通,多孔介質為細砂時優化效果更為明顯。

            關鍵詞:多孔介質,地下水源熱泵,采能區,熱貫通,溫度場,熱影響半徑,井距,運行模式

            Abstract:

            In order to study the influence of different porous media on the temperature field in the energy extraction area of the groundwater-source heat pump, establishes an aquifer water-thermal coupling model to simulate and analyse the changes of the groundwater temperature field when the groundwater-source heat pump operates under five kinds of porous media conditions.Proposes the reasonable well spacing and the optimal operation mode based on the time of thermal breakthrough and the temperature diffusion degree of recharging water. The results indicate that under the condition of natural cross flow of groundwater flowing from the pumping well to the recharge well, fine sand is the most prone to thermal breakthrough, followed by medium sand and medium coarse sand, and coarse sand and gravel are the least likely to prone thermal breakthrough. The obvious extent that the heat influence radius of recharging water decreases with the increase of permeability coefficient is ranked as coarse sand, medium coarse sand, gravel, medium sand and fine sand, but the heat influence radius of gravel is significantly smaller than that of other porous media. The reasonable well spacing of different porous media with different permeability coefficients can be obtained from the fitting curve. The operation mode of large temperature difference and small flow rate contributes to alleviate or avoid thermal breakthrough, and the optimization effect is more obvious when the porous media is fine sand.

            Keywords:porousmedium,groundwater-sourceheatpump,energyextractionarea,thermalbreakthrough,temperaturefield,heatinfluenceradius,wellspacing,operationmode

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