窮舉搜索法確定地下土壤熱物性參數(shù)及準確性分析
發(fā)布時間：2019-03-20 08:48
【摘要】：地源熱泵系統(tǒng)可以有效利用淺層地熱能,對環(huán)境影響小、壽命長、效能系數(shù)高,作為一項可再生能源技術(shù)近年來得到快速發(fā)展。獲取準確的地下土壤熱物性參數(shù)是合理設(shè)計地埋管長度、提高系統(tǒng)有效利用率、降低系統(tǒng)初投資的關(guān)鍵,對推廣地源熱泵技術(shù)具有重要意義。恒熱流測試法是目前獲取地下土壤熱物性參數(shù)的主要方法,但是,目前研究中針對恒熱流測試時間長短的問題尚沒有明確定論,測試過程中,通常人為設(shè)定測試時間而不是根據(jù)現(xiàn)場測試結(jié)果準確性決定測試時間,這可能會導(dǎo)致測試結(jié)果準確性不高。另外,測試分析過程中采用的優(yōu)化方法通常僅能得到較為準確的導(dǎo)熱系數(shù)值,而鉆孔內(nèi)熱阻和容積比熱計算結(jié)果可信度相對較差。針對上述問題,論文提出了利用窮舉搜索法確定熱物性參數(shù)的測試分析方法。論文比較了二參數(shù)估計法、三參數(shù)估計法以及線熱源模型、柱熱源模型、實心柱熱源模型在計算地下土壤熱物性參數(shù)方面的結(jié)果準確性,發(fā)現(xiàn)三參數(shù)估計法計算結(jié)果較二參數(shù)估計法準確,線熱源模型計算速度快、準確度較高,更適于工程應(yīng)用。對窮舉搜索法、遺傳算法、蟻群算法、復(fù)形調(diào)優(yōu)法的計算結(jié)果準確性進行了對比分析,并利用實驗和實際工程進行檢驗,表明窮舉搜索法較其他幾種方法得到的熱物性參數(shù)更具可信性。開發(fā)了地下土壤熱物性測試計算軟件,該軟件在現(xiàn)場進行地下土壤熱物性測試時,可實時計算分析熱物性參數(shù)結(jié)果,當?shù)玫椒�(wěn)定的測試結(jié)果后,自動發(fā)出測試停止信號,并輸出得到土壤熱物性參數(shù)最終測試結(jié)果,從而避免因人為決斷測試時間而可能導(dǎo)致測試結(jié)果準確性不高的情況。
[Abstract]:The ground-source heat pump (GSHP) system can utilize the shallow geothermal energy effectively, has little influence on the environment, long life and high efficiency coefficient. As a renewable energy technology, GSHP has been developed rapidly in recent years. Obtaining accurate thermal parameters of underground soil is the key to reasonably design the length of buried pipe, improve the effective utilization ratio of the system and reduce the initial investment of the system. It is of great significance to popularize the technology of ground source heat pump (GSHP). The method of constant heat flow measurement is the main method to obtain the thermal physical parameters of underground soil at present. However, there is no clear conclusion about the length of testing time of constant heat flow in the current research, in the process of testing, there is no clear conclusion about the length of test time. The test time is usually set artificially rather than determined by the accuracy of the field test results, which may lead to low accuracy of the test results. In addition, the optimization method used in the test and analysis is usually only able to obtain more accurate thermal conductivity values, but the reliability of the calculation results of thermal resistance and volume specific heat in borehole is relatively poor. In order to solve the above problems, this paper presents a test and analysis method to determine thermal physical parameters by exhaustive search method. The accuracy of the two-parameter estimation method, the three-parameter estimation method, the linear heat source model, the column heat source model and the solid column heat source model in calculating the thermal physical parameters of underground soil are compared in this paper. It is found that the calculation results of the three-parameter estimation method are more accurate than that of the two-parameter estimation method, and the calculation speed and accuracy of the linear heat source model are faster and more accurate. The accuracy of calculation results of exhaustive search method, genetic algorithm, ant colony algorithm and complex optimization method are compared and analyzed, and the results are tested by experiment and practical engineering. It is shown that the exhaustive search method is more reliable than the other methods in terms of thermophysical parameters. The software for testing and calculating the thermal properties of underground soil is developed. When testing the thermal properties of underground soil on the spot, the software can calculate and analyze the results of thermal properties parameters in real time. When the stable test results are obtained, the test stop signal will be sent out automatically. Finally, the final test results of soil thermal physical parameters are obtained, so as to avoid the situation that the accuracy of test results may not be high due to the artificial determination of test time.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU83
本文編號：2444049
[Abstract]:The ground-source heat pump (GSHP) system can utilize the shallow geothermal energy effectively, has little influence on the environment, long life and high efficiency coefficient. As a renewable energy technology, GSHP has been developed rapidly in recent years. Obtaining accurate thermal parameters of underground soil is the key to reasonably design the length of buried pipe, improve the effective utilization ratio of the system and reduce the initial investment of the system. It is of great significance to popularize the technology of ground source heat pump (GSHP). The method of constant heat flow measurement is the main method to obtain the thermal physical parameters of underground soil at present. However, there is no clear conclusion about the length of testing time of constant heat flow in the current research, in the process of testing, there is no clear conclusion about the length of test time. The test time is usually set artificially rather than determined by the accuracy of the field test results, which may lead to low accuracy of the test results. In addition, the optimization method used in the test and analysis is usually only able to obtain more accurate thermal conductivity values, but the reliability of the calculation results of thermal resistance and volume specific heat in borehole is relatively poor. In order to solve the above problems, this paper presents a test and analysis method to determine thermal physical parameters by exhaustive search method. The accuracy of the two-parameter estimation method, the three-parameter estimation method, the linear heat source model, the column heat source model and the solid column heat source model in calculating the thermal physical parameters of underground soil are compared in this paper. It is found that the calculation results of the three-parameter estimation method are more accurate than that of the two-parameter estimation method, and the calculation speed and accuracy of the linear heat source model are faster and more accurate. The accuracy of calculation results of exhaustive search method, genetic algorithm, ant colony algorithm and complex optimization method are compared and analyzed, and the results are tested by experiment and practical engineering. It is shown that the exhaustive search method is more reliable than the other methods in terms of thermophysical parameters. The software for testing and calculating the thermal properties of underground soil is developed. When testing the thermal properties of underground soil on the spot, the software can calculate and analyze the results of thermal properties parameters in real time. When the stable test results are obtained, the test stop signal will be sent out automatically. Finally, the final test results of soil thermal physical parameters are obtained, so as to avoid the situation that the accuracy of test results may not be high due to the artificial determination of test time.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU83
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1 吳迪;窮舉搜索法確定地下土壤熱物性參數(shù)及準確性分析[D];山東建筑大學(xué);2017年
，本文編號：2444049
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