共查询到19条相似文献,搜索用时 251 毫秒
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地下水地源热泵回灌分析 总被引:7,自引:0,他引:7
推导了地下水地源热泵地下水渗流理论降深解,分析了无堵塞和考虑堵塞时地下水地源热泵异井回灌和同井回灌状况。无堵塞各向异性均质含水层中地下水地源热泵的灌压随着水平渗透系数的减小而急剧增加,渗透系数大小是回灌难易程度的决定因素。抽灌同井抗堵塞能力优于完整井和非完整井。水井堵塞显著增加地下水地源热泵的灌压,回扬对于减小系统灌压大有益处,尤其是对于回灌困难的系统。无论有无堵塞,对于同一含水层如果采用传统的异井回灌地下水地源热泵,从回灌效果来说均应优先考虑采用完整井的地下水地源热泵。 相似文献
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开发地源热泵,利用地下水作为地源热泵的冷热源,需要进行专门的水文地质勘察,勘察重点要取得冷热源井的出水量、回灌量、地下水温度、水位、流速、流向和水质资料,选择理想的供水含水层,评估地下水可开采量,初步确定抽灌井比等,本文结合工程实例对地源热泵水文地质勘察需要解决的问题做初步的探讨,说明水文地质勘察在开发地源热泵中具有十分重要的意义。 相似文献
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我国目前地下水换热系统可分为:单井抽灌,即1口井内完成抽水和灌水,能量交换系统在同1口井内完成;对井抽灌,即1口井抽水,另1口井灌水,互相交替使用;另1种是,1口井抽水,多井回灌。而一般为了保证回灌效果,抽水井与回灌井比例不少于1∶2,有的可达1∶3或1∶4。目前国内地下水交换系统,大多数是成功的,也有少数是失败的,它的表现形式主要是回灌不回去,造成泡汤现象。有的工程1抽3灌、1抽4灌也灌不回去,这是因为在施工前,忽视了回灌水量的勘查,也就是回注量的勘查,以为出水量越多越好。其实不管单井抽灌、对井抽灌还是1井多灌也好,能不能把抽上来… 相似文献
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建立抽/灌井群地下水热运移实验系统,开展抽/灌过程含水层温度场与地下水渗流场演化规律研究,特别对有、无初始自然流的水平流、垂直交叉流和静态流的影响作用进行系统研究。结果表明,地下水初始自然流的方向和流速对含水层温度场的影响范围和程度起着关键作用,表现出自然流与抽/灌渗流交互的影响。当自然水平流与抽/灌渗流流向相反时,流速越大,抽水温度受到回灌水温度影响的推迟性越大,延迟热贯通时间和减轻热交互程度。相反,流向相同时,将加剧热贯通和热交互影响。对于垂直交叉流态,流速越大,地下水渗流场及其温度场影响范围偏移程度越大,通常减轻热贯通和热交互影响。 相似文献
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以保定市某地源热泵项目为研究对象,详细分析了钻孔设置竖直埋管换热器方式和地下水抽灌井方式的系统设计方案、资源条件、初投资及运行成本。结果表明地下水抽灌井方式取热方案的初投资是钻孔设置竖直埋管换热器方式的1/2以下,但其总运行费用要远高于钻孔设置竖直埋管换热器方式。 相似文献
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本文给出了单井循环地下换热系统的型式。单井循环地下换热系统的热源井现阶段共有三种:循环单并、抽灌同井和填砾抽灌同井。分析了单井循环地下换热系统的特点和它们之间的区别,综述了单井循环地下换热系统在国内外的应用现状。认为单井循环地下换热系统会有广阔的应用前景,但应用中应关注:回灌问题、热贯通问题和季节性储能问题。 相似文献
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热负荷对同井回灌地下水源热泵的影响 总被引:8,自引:1,他引:7
模拟研究了热负荷对同井回灌地下水源热泵抽水和回灌降深、抽水温度和热影响范围的影响。研究发现,随着抽水流量的增加,抽水和回灌降深绝对值增加,抽水温度降低;对于易于出现热贯通的含水层,在条件允许的情况下应采用小抽水温差和大抽水流量。 相似文献
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地下水回灌技术在热泵技术的应用中由于受其回灌过程中物理、化学及生物作用产生的入渗介质堵塞现象而严重地影响到热泵的工作效率.通过对赣榆县财税业务大楼的水文地质条件进行了测试及分析,确定该建筑中央空调系统采用水源热泵系统,并详细分析了该系统的地下水取水有效性及回灌方案的可行性,研究了双管制双井回灌模式的回灌效果,得出双管制... 相似文献
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The use of groundwater for cooling and heating purposes is of interest from both the economical and the ecological perspective. The groundwater heat pump (GWHP) system utilizes groundwater as alternative renewable and clean energy source for space heating and/or cooling, withdraws water from a production well, passes it through a heat exchanger and discharges the water into an injection well. By utilizing the relatively stable temperature of groundwater, GWHP system can achieve a higher coefficient of performance. Due to the utilization of groundwater stored in the aquifer, the assessment of the hydraulic capacity of the aquifer based on numerical groundwater models is always needed for the optimum design and the efficient performance of GWHP. In this paper, numerical methods of underground heat-water transfer, energy balance method and thermal storage method were presented to calculate the capacity of unit area of shallow groundwater aquifer. The model results indicate that the numerical method, which is based on performance efficiency of GWHP, represents the behaviour of groundwater pumping/recharging processes, and serves better than energy balance method and thermal storage method, in addition it has been proven itself that this method has the advantages of energy saving and environmental protection. The calculated capacity is positively related to aquifer thickness. It is found that it is easy for ground water recharge in alluvial and pluvial fan located at the piedmont, while the calculated capacity is relatively smaller compared with that of south-east plain where it is not easy for groundwater recharge. 相似文献
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To achieve high heat pump efficiency, groundwater heat pump (GWHP) system uses groundwater, which is relatively stable AT temperature compared with outdoor air, as a heat source. However, it is difficult to meet annual heating and cooling loads using only groundwater as a heat source. In order to optimize the operation method of GWHP systems, it is necessary to develop a system utilizing both groundwater and air sources according to the building load conditions. Furthermore, during intermediate seasons (such as spring and autumn) with reduced heating and cooling loads, GWHP system is less efficient than air source heat pump (ASHP) system according to temperature conditions. In order to more efficiently use GWHP systems, it is necessary to develop a system which utilizes both groundwater and air sources according to temperature conditions and building loads. This research has developed a GWHP system that employs a hybrid heat pump system with groundwater wells using dual groundwater and air heat sources. In this paper, the annual performance of the developed system has been calculated, and several case studies have been conducted on the effect of introduction location, refrigerant and pumping rate. Furthermore, the coefficient of system performance and the effects on underground environments have been evaluated by real-scale experiment using two wells. 相似文献
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地下浅层地能资源(地下水)的非开采利用,可以通过热泵装置实现供热和制冷的双重作用.地源热泵充分利用了地温逆变性(冬暖夏凉)和常年温变小以及蓄能的特点,实现了能量的再利用和良好的环保效能,使在北方冬季应用热泵供暖系统成为现实,并可实现供热制冷系统一体化.通过实际工程论述了该技术的可行性. 相似文献
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针对目前植物工厂主要采用的化石燃料供能方式释放出大量温室气体和有害气体危害环境的问题,设计太阳能光伏-地源热泵式供能植物工厂空调系统,利用地下水源热泵制冷供暖植物工厂,借助太阳能光伏技术供电地源热泵系统。植物工厂位于同济大学生态园内,属自然光利用联栋小屋脊玻璃温室,占地面积927 m2。通过确定植物工厂的冷热负荷选型制热量和制冷量分别为264 kW和240 kW的水源热泵,地下水抽水量为32.46 m3/h,确定太阳能光伏阵列总功率为54 667 wp。最后分析了太阳能光伏-地源热泵式供能植物工厂空调系统的经济效益和节能减排效益。 相似文献