【摘要】：地源熱泵是利用淺層地?zé)崮軐ㄖ镞M(jìn)行供暖制冷的高效節(jié)能環(huán)保型空調(diào),其中垂直土壤埋管系統(tǒng)由于節(jié)約用地、換熱性能好、不消耗地下水,在我國得到了最廣泛的應(yīng)用。地源熱泵的利用成為了應(yīng)對全球能源危機(jī)、氣候變暖、發(fā)展低碳經(jīng)濟(jì)的重要途徑。垂直土壤埋管地源熱泵機(jī)組設(shè)計(jì)的關(guān)鍵技術(shù)是地下土壤熱交換器,而地下土壤中的熱量是經(jīng)換熱孔中的回填材料傳遞給U形管及管內(nèi)液體的。高導(dǎo)熱性能的回填材料可以降低換熱孔內(nèi)的熱阻,減少地下?lián)Q熱孔深度和換熱管長度,從而減少地源熱泵的安裝成本,推廣使用地源熱泵。本文在兼顧地源熱泵回填材料傳熱特性、工程性能和造價、穩(wěn)定環(huán)保的基礎(chǔ)上,對膨潤土基和水泥基兩種回填材料進(jìn)行了配比測試和優(yōu)化集成,取得了以下成果:(1)膨潤土基回填材料導(dǎo)熱系數(shù)受骨料含量、干密度、含水率、孔隙率的影響規(guī)律。(2)水泥基回填材料的最優(yōu)水灰比為0.55,最佳砂灰比2.0;內(nèi)摻3%的天然石墨粉,導(dǎo)熱系數(shù)增大17.8%;內(nèi)摻8%的緩凝泵送型混凝土膨脹劑,可以顯著提高膨脹特性,并且產(chǎn)生11%的減水作用,導(dǎo)熱系數(shù)也有所增大。(3)膨潤土基和水泥基回填材料的導(dǎo)熱系數(shù)都隨溫度升高而增大,地溫梯度變化有助于提高回填材料的導(dǎo)熱能力。(4)添加聚丙烯類阻裂纖維,能顯著提高回填材料抗裂性,抑制干濕循環(huán)裂隙。(5)優(yōu)化集成后得出了兩種回填材料的適宜配比,具有良好的導(dǎo)熱能力和工程性能,能夠明顯降低換熱孔深度和換熱管長度,減少工程造價。
[Abstract]:Ground-source heat pump (GSHP) is an efficient energy-saving and environment-friendly air conditioning system which uses shallow geothermal energy to heat and refrigeration buildings. The vertical soil buried pipe system is widely used in our country because of saving land, good heat transfer performance and no consumption of groundwater. The utilization of ground source heat pump has become an important way to deal with the global energy crisis, climate warming and the development of low carbon economy. The key technology of the design of vertical buried pipe ground source heat pump unit is the underground soil heat exchanger, and the heat in the underground soil is transferred to the U-tube and the liquid in the pipe through the backfill material in the heat exchange hole. The backfill material with high thermal conductivity can reduce the heat resistance in the heat exchange hole, reduce the depth of the underground heat transfer hole and the length of the heat exchanger pipe, thus reduce the installation cost of the ground source heat pump and popularize the use of the ground source heat pump. On the basis of considering heat transfer characteristics, engineering performance and cost of backfill materials of ground-source heat pump, and stabilizing environmental protection, the ratio test and optimization integration of bentonite based backfill materials and cement based backfill materials are carried out in this paper. The results are as follows: (1) the thermal conductivity of bentonite based backfill is affected by aggregate content, dry density, moisture content and porosity. (2) the optimum water-cement ratio of cement-based backfill is 0.55 and the optimum sand / cement ratio is 2.0; When 3% of natural graphite powder is added, the thermal conductivity increases by 17.8%. Adding 8% retarding and pumping type concrete expansion agent can significantly improve the expansion characteristics and produce 11% water reducing effect. (3) the thermal conductivity of bentonite and cement based backfill materials increases with the increase of temperature, and the change of geothermal gradient is helpful to improve the thermal conductivity of backfill materials. It can obviously improve the crack resistance of backfill material and restrain dry-wet cycle crack. (5) the optimum ratio of two backfill materials is obtained after optimization and integration, which has good thermal conductivity and engineering performance. It can obviously reduce the depth of heat transfer hole and the length of heat transfer pipe, and reduce the engineering cost.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU83;P314

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