【摘要】：人類社會(huì)的發(fā)展與進(jìn)步離不開能源,能源開發(fā)利用技術(shù)的不斷進(jìn)步推動(dòng)了經(jīng)濟(jì)的發(fā)展和科學(xué)的進(jìn)步。目前,對(duì)新能源的開發(fā)與利用是當(dāng)今世界發(fā)展的主題之一。淺層地溫能作為一種積蓄在地下(0~200m)的優(yōu)質(zhì)清潔能源,因其具有分布廣泛、儲(chǔ)量巨大、埋藏較淺、可就近開發(fā)利用等優(yōu)點(diǎn)被世界各國(guó)青睞。土壤源熱泵作為一種節(jié)能、環(huán)保的熱泵技術(shù),其地埋管換熱器與周圍土壤間的熱交換能力一直是廣大科技工作者關(guān)注的重點(diǎn)。地埋管埋設(shè)于飽和帶與非飽和帶中,熱交換以非穩(wěn)態(tài)的方式進(jìn)行,過(guò)程十分復(fù)雜。在非飽和帶中,熱交換介質(zhì)涉及固、液、氣三相,傳熱方式主要為熱傳導(dǎo);在飽和帶中,熱交換在固、液兩相間進(jìn)行,傳熱方式包括熱傳導(dǎo)與熱對(duì)流。本文根據(jù)多孔介質(zhì)傳熱傳質(zhì)理論和地埋管換熱器周圍土壤的實(shí)際情況,搭建了砂箱試驗(yàn)臺(tái),對(duì)無(wú)滲流、不同滲流速度、不同冷/熱源溫度、不同環(huán)境溫度條件下飽和-非飽和區(qū)的熱遷移特性進(jìn)行了研究。在研究過(guò)程中,將灰色馬爾科夫模型應(yīng)用于對(duì)熱遷移趨勢(shì)性和隨機(jī)性規(guī)律的研究當(dāng)中。結(jié)果表明,飽和、非飽和區(qū)的熱遷移特性不盡相同。無(wú)滲流、不同滲流速度、不同冷/熱源溫度、不同環(huán)境溫度對(duì)飽和-非飽和區(qū)的熱遷移有著不同的影響。無(wú)滲流條件下,飽和區(qū)熱量由熱源向外傳遞,關(guān)于熱源對(duì)稱;非飽和區(qū)熱遷移特性與飽和區(qū)相似,無(wú)明顯差別。隨機(jī)溫度值在1℃之內(nèi)。飽和區(qū)中隨機(jī)狀態(tài)集中于中等級(jí)別,非飽和區(qū)隨機(jī)狀態(tài)分布均勻。有滲流條件下,熱遷移強(qiáng)于無(wú)滲流條件下熱遷移,飽和區(qū)強(qiáng)于非飽和區(qū),飽和區(qū)部分熱量向非飽和區(qū)遷移;隨著滲流速度的增加,熱遷移逐漸增強(qiáng),飽和區(qū)與非飽和區(qū)差別減小。受滲流作用的影響,U型管下游隨機(jī)溫度增大,部分區(qū)域隨機(jī)溫度大于1℃。飽和區(qū)中隨機(jī)狀態(tài)集中于中等級(jí)別,非飽和區(qū)隨機(jī)狀態(tài)分布均勻。冷、熱源溫度決定了飽和-非飽和區(qū)熱遷移的程度與方向,飽和區(qū)熱遷移強(qiáng)于非飽和區(qū)。同等條件下,熱遷移在加熱條件優(yōu)于制冷條件。環(huán)境溫度變化對(duì)飽和區(qū)與非飽和區(qū)影響不同。非飽和區(qū)中,環(huán)境溫度變化主要影響熱遷移的趨勢(shì)性;飽和區(qū)中,環(huán)境溫度的變化主要影響熱遷移的隨機(jī)性。
[Abstract]:The development and progress of human society can not be separated from energy, and the continuous progress of energy development and utilization technology has promoted the economic development and scientific progress. At present, the development and utilization of new energy is one of the themes of the development of the world. Shallow geothermal energy, as a kind of high-quality clean energy stored underground (0 ~ 200m), has been favored by countries all over the world for its advantages of wide distribution, huge reserves, shallow burial, and the ability to be developed and utilized nearby. Ground-source heat pump (GSHP) is an energy-saving and environment-friendly heat pump technology. The heat exchange capacity between ground heat exchanger and surrounding soil is always the focus of scientific and technological workers. The buried pipe is buried in the saturated zone and unsaturated zone, and the heat exchange takes place in an unsteady state, and the process is very complicated. In the unsaturated zone, the heat exchange medium involves solid, liquid and gas, and the heat transfer mode is mainly heat conduction; in the saturated zone, the heat exchange takes place between solid and liquid phases, and the heat transfer mode includes heat conduction and heat convection. Based on the theory of heat and mass transfer in porous media and the actual situation of soil around the ground buried tube heat exchanger, a sand box test bed is built. The thermal transport characteristics of saturated-unsaturated region at different ambient temperatures were investigated. In the process of research, grey Markov model is applied to study the trend and randomness of heat transfer. The results show that the heat transfer characteristics of saturated and unsaturated regions are different. No seepage, different seepage velocity, different cold / heat source temperature, different ambient temperature have different effects on the heat transfer in saturated-unsaturated region. Under the condition of no seepage, the heat in the saturated region is transferred from the heat source to the external heat source, and the heat transfer characteristics in the unsaturated region are similar to those in the saturated region, but there is no obvious difference. The random temperature is within 1 鈩，

本文編號(hào)：2379935