【摘要】：土壤源熱泵系統(tǒng)因?yàn)槠涓咝Аh(huán)保、節(jié)能等特性日益得到人們廣泛的重視，而應(yīng)用和推廣地源熱泵的關(guān)鍵技術(shù)之一是解決地埋管與土壤之間的傳熱問題，因此完善地下?lián)Q熱器的傳熱模型，使其能更真實(shí)的模擬地埋管換熱器傳熱過程具有重要的意義。 本文對(duì)雙U型管地下?lián)Q熱器進(jìn)行三維傳熱和流動(dòng)模擬計(jì)算，與現(xiàn)有的簡(jiǎn)化模型相比，在模擬中沒有任何幾何尺寸上的簡(jiǎn)化，真實(shí)模擬包括管內(nèi)液體與管內(nèi)壁間的對(duì)流傳熱，管壁與回填材料之間的導(dǎo)熱，回填材料與土壤導(dǎo)熱以及土壤的導(dǎo)熱在內(nèi)的復(fù)雜傳熱過程。本文的研究?jī)?nèi)容主要有： 1.建立三維流固耦合傳熱模型，模擬了放熱工況下雙U型管與土壤的傳熱，得到雙U型管水平和豎直方向上的溫度分布特點(diǎn)，并提取出了雙U型管的單位井深換熱量隨時(shí)間的變化規(guī)律。 2.結(jié)合熱響應(yīng)實(shí)驗(yàn)將埋管出口水溫及孔壁溫度的實(shí)測(cè)值與模擬結(jié)果對(duì)比，平均誤差分別為4.9%和3.7%，，驗(yàn)證了本文建立的地下?lián)Q熱器傳熱模型的正確性。 3.用驗(yàn)證后的模型與現(xiàn)有有限長線熱源模型進(jìn)行對(duì)比分析，根據(jù)模擬結(jié)果對(duì)線熱源模型進(jìn)行數(shù)值修正。 4.在修正后的線熱源模型基礎(chǔ)上建立土壤源熱泵換熱孔群的三維模型，模擬土壤源熱泵換熱孔群傳熱特性的研究。 本文對(duì)土壤源熱泵地下?lián)Q熱器的研究可以應(yīng)用于實(shí)際工程并作出指導(dǎo)。
[Abstract]:Ground-source heat pump system has been paid more and more attention because of its high efficiency, environmental protection, energy saving and so on. One of the key technologies in the application and popularization of ground-source heat pump is to solve the heat transfer problem between ground buried pipe and ground source heat pump. Therefore, it is of great significance to perfect the heat transfer model of underground heat exchanger and make it more realistic to simulate the heat transfer process of underground tube heat exchanger. In this paper, the three-dimensional heat transfer and flow simulation of the double-U-tube underground heat exchanger is carried out. Compared with the existing simplified model, there is no simplification in the geometry of the simulation. The real simulation includes the convection heat transfer between the liquid in the tube and the inner wall of the tube. Heat conduction between pipe wall and backfill material, heat conduction between backfill material and soil, and heat conduction in soil. The main contents of this paper are as follows: 1. A three-dimensional fluid-solid coupled heat transfer model was established to simulate the heat transfer between double U tube and soil under the condition of heat release, and the temperature distribution characteristics in horizontal and vertical direction of double U tube were obtained. The variation law of heat transfer per unit well depth with time of double U tube is also extracted. 2. The experimental results show that the average errors are 4.9% and 3.7%, respectively, which verify the correctness of the heat transfer model established in this paper. 3. The verified model is compared with the existing finite line heat source model, and the linear heat source model is modified numerically according to the simulation results. 4. Based on the modified linear heat source model, a three-dimensional model of the ground source heat pump (GSHP) was established to simulate the heat transfer characteristics of the ground-source heat pump (GSHP). In this paper, the ground heat exchanger of ground source heat pump can be applied to practical engineering.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU83

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