發布日期:2018-04-11 作者:地源熱泵公司 點擊:


Ground source heat pump technology is to use the formation of shallow part through a dedicated PE pipeline transmission underground heat resources of technology, this is very environmental protection, which is loved by many people. What are the requirements for connecting the relevant equipment? Ground source heat pump buried pipe is according to the results of the survey at the scene to decide, first consider the scene usably surface area, the local soil type and drilling cost, determine heat exchanger using vertical shaft arrangement or horizontal arrangement. While horizontal arrangement is usually shallow buried pipe, can use artificial digging, initial investment generally will be cheaper, but its heat transfer performance than vertical buried tube much smaller, and are often limited by available land area, so in the practical engineering, usually using vertical buried tube arrangement. According to the method of buried pipe, there are basically three kinds of vertical buried pipe: U tube, casing type, single pipe type.


There is heat loss in the inside and outer tube flow heat exchange. The use of single pipe type is restricted by hydrogeological conditions. U-shaped tube application, most general under 50 mm diameter, the deeper the buried pipe, the better the performance of heat transfer, the data indicate that most of U type pipe buried depth has reached 180 m. loop has three kinds of typical u-shaped tube, one of the most common use is in each shaft arrangement of the u-shaped tube.


串聯或并聯地下熱交換器中流體流動的回路形式有串聯和并聯兩種,串聯系統管徑較大,管道費用較高,并且長度壓降特性限制了系統能力。并聯系統管徑較小,管道費用較低,且常常布置成同程式,當每個并聯環路之間流量平衡時,其換熱量相同,其壓降特性有利于提高系統能力。因此,實際工程一般都采用并聯同程式。結合上文,即常采用單 U型管并聯同程的熱交換器形式。

Series or parallel circuit of underground heat exchangers in the fluid flow form has two kinds of series and parallel, serial system larger diameter, higher cost of pipeline, and the length of the pressure drop characteristics of limiting the system capability. Paralleling system pipe diameter smaller, pipeline cost is low, and often decorated with the program, when the flow balance between each parallel loop, its heat transfer is the same, the pressure drop characteristics to improve system capacity. As a result, practical projects are generally adopted and combined. In combination with the above, the form of heat exchanger with single U tube and cohoming process.

選擇管材一般來講,一旦將換熱器埋入地下后,基本不可能進行維修或更換,這就要求保證埋入地下管材的化學性質穩定并且耐腐蝕。常規空調系統中使用的金屬管材在這方面存在嚴重不足,且需要埋入地下的管道的數量較多,應該優先考慮使用價格較低的管材。所以,土壤源熱泵系統中一般采用塑料管材。目前Z常用的是聚乙烯( PE)和聚丁烯(PB)管材,它們可以彎曲或熱熔形成更牢固的形狀,可以保證使用50年以上;而PVC管材由于不易彎曲,接頭處耐壓能力差,容易導致泄漏,因此,不推薦用于地下埋管系統。

Choice of tubing in general, once buried heat exchanger underground, basic impossible for repair or replacement, which requires the guarantee of buried pipe chemical stability and corrosion resistance. Conventional air conditioning system used in the metal pipe serious deficiencies in this respect, and the number of buried pipeline is more, should give priority to use lower prices of pipes. As a result, the soil source heat pump system usually adopts plastic tubing. The most commonly used ones are polyethylene (PE) and polybutylene (PB) pipes, which can be bent or heated to form a stronger shape and can be used for more than 50 years. The PVC pipe is not easy to bend, and the pressure capacity of the receiver is poor, so it is easy to leak, so it is not recommended for underground pipe system.


The proper embedding method can make the ground source heat pump achieve the best use effect.




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