竖直地埋管热相似试验台原理及试验验证
|
摘要
以考虑岩土竖向分层的竖直地埋管换热器传热模型为基础,通过热相似原理对该传热模型进行相似转换,得到了几何、时间、流速等相似倍数的关系。以某工程为例,基于相似准则,搭建了竖直单U地埋管相似模型试验台。通过该试验台地埋管运行24h(相当于原型运行64d)的测试数据,对已建的三维数值模型(相似模型和原型)计算结果进行验证。结果表明,地埋管出口温度平均相对误差为1%,进出口温差平均相对误差为8%,土壤温度相对误差为3%。该试验台实现了以较小成本和可控短期运行时间对复杂工况下地埋管长期换热规律的研究。
Based on a heat transfer model of vertical ground heat exchanger considering soil vertical stratification,similarly converts the heat transfer model by the thermal similarity principle,obtains the similarity ratios such as flow velocity,geometry and time.Based on a project and the similarity criteria,develops a vertical single U-shape pipe similarity model experiment system.Using the test data of experiment system in 24 hours running(equivalent to 64 days of prototype operation),verifies the calculated results of the three-dimensional numerical model(similar model and prototype model).The results show that the average relative error of the outlet temperature of the buried pipe is 1%,the average relative error of the temperature difference between the inlet and outlet is 8%,and the relative error of the soil temperature is 3%.The similar experiment system realizes the study of the long-term heat transfer characteristics of buried pipes under complex conditions with relative low costs and controlled short-term operating time.
Based on a heat transfer model of vertical ground heat exchanger considering soil vertical stratification,similarly converts the heat transfer model by the thermal similarity principle,obtains the similarity ratios such as flow velocity,geometry and time.Based on a project and the similarity criteria,develops a vertical single U-shape pipe similarity model experiment system.Using the test data of experiment system in 24 hours running(equivalent to 64 days of prototype operation),verifies the calculated results of the three-dimensional numerical model(similar model and prototype model).The results show that the average relative error of the outlet temperature of the buried pipe is 1%,the average relative error of the temperature difference between the inlet and outlet is 8%,and the relative error of the soil temperature is 3%.The similar experiment system realizes the study of the long-term heat transfer characteristics of buried pipes under complex conditions with relative low costs and controlled short-term operating time.
引文
[1] CASASSO A,SETHI R.Efficiency of closed loop geothermal heat pumps:a sensitivity analysis[J].Renewable Energy,2014,62(3):737 746
[2] ZHANG C,GUO Z,LIU Y,et al.A review on thermal response test of ground-coupled heat pump systems[J]. Renewable and Sustainable Energy Reviews,2014,40(S):851 867
[3]姚杨,李斌,范蕊,等.热渗共同作用下地下换热器的初步实验研究[C]∥2006全国暖通空调制冷学术年会文集,2006:219 222
[4]张琳琳.渗流作用下的竖直地埋管换热器传热性能理论及实验研究[D].西安:西安建筑科技大学,2016:39 61
[5]毕文明,岳丽燕,韩再生,等.地埋管换热性能综合微缩试验研究[J].水文地质工程,2014,41(1):144 148
[6]余延顺,张少凡,马娟,等.土壤耦合热泵系统模型试验台设计[J].南京理工大学学报(自然科学版),2010,34(5):613 617
[7]王松松.地源热泵地下传热强化与控制模式的研究[D].扬州:扬州大学,2011:45 62
[8]王铁.地埋管地源热泵系统地下热渗耦合传热特性的实验研究[D].大连:大连理工大学,2016:12 50
[9]刘东林.水热耦合作用下地埋管换热特性研究[D].北京:中国地质大学,2011:40 54
[10]BEIER R A, SMITH M D, SPITLER J D.Reference data sets for vertical borehole ground heat exchanger models and thermal response test analysis[J].Geothermics,2011,40(1):79 85
[11]BERNIER A.A small-scale experimental apparatus to study heat transfer in the vicinity of geothermal boreholes[J].HVAC&R Research,2014,20(7):819 827
[12]EROL S,FRANOIS B.Efficiency of various grouting materials for borehole heat exchangers[J].Applied Thermal Engineering,2014,70(1):788 799
[13]王丰.相似理论及其在传热学中的应用[M].北京:高等教育出版社,1990:105 163
[14]LI W,LI X,PENG Y,et al.Experimental and numerical investigations on heat transfer in stratified subsurfacematerials[J]. AppliedThermal Engineering,2018,135:228 237
[15]刘方,翁庙成,龙天渝.CFD基础及应用[M].重庆:重庆大学出版社,2015:33
[16]孔磊.螺旋型地埋管换热器换热性能的研究[D].扬州:扬州大学,2015:43 44
[17]马娟.土壤耦合热泵系统的长周期运行特性研究[D].南京:南京理工大学,2009:29 30
[18]王勇,谢烨,李文欣.武汉与重庆典型地质结构下的地埋管换热性能[J].土木建筑与环境工程,2017,39(4):17 25
[19]ASHRAE. ASHRAEhandbook—HVAC applications[M].Atlanta:ASHRAE Inc,2011:34
[20]LI W,LI X, WANG Y,et al. An integrated predictive model of the long-term performance of ground source heat pump(GSHP)systems[J].Energy and Buildings,2017,159:309 318
[2] ZHANG C,GUO Z,LIU Y,et al.A review on thermal response test of ground-coupled heat pump systems[J]. Renewable and Sustainable Energy Reviews,2014,40(S):851 867
[3]姚杨,李斌,范蕊,等.热渗共同作用下地下换热器的初步实验研究[C]∥2006全国暖通空调制冷学术年会文集,2006:219 222
[4]张琳琳.渗流作用下的竖直地埋管换热器传热性能理论及实验研究[D].西安:西安建筑科技大学,2016:39 61
[5]毕文明,岳丽燕,韩再生,等.地埋管换热性能综合微缩试验研究[J].水文地质工程,2014,41(1):144 148
[6]余延顺,张少凡,马娟,等.土壤耦合热泵系统模型试验台设计[J].南京理工大学学报(自然科学版),2010,34(5):613 617
[7]王松松.地源热泵地下传热强化与控制模式的研究[D].扬州:扬州大学,2011:45 62
[8]王铁.地埋管地源热泵系统地下热渗耦合传热特性的实验研究[D].大连:大连理工大学,2016:12 50
[9]刘东林.水热耦合作用下地埋管换热特性研究[D].北京:中国地质大学,2011:40 54
[10]BEIER R A, SMITH M D, SPITLER J D.Reference data sets for vertical borehole ground heat exchanger models and thermal response test analysis[J].Geothermics,2011,40(1):79 85
[11]BERNIER A.A small-scale experimental apparatus to study heat transfer in the vicinity of geothermal boreholes[J].HVAC&R Research,2014,20(7):819 827
[12]EROL S,FRANOIS B.Efficiency of various grouting materials for borehole heat exchangers[J].Applied Thermal Engineering,2014,70(1):788 799
[13]王丰.相似理论及其在传热学中的应用[M].北京:高等教育出版社,1990:105 163
[14]LI W,LI X,PENG Y,et al.Experimental and numerical investigations on heat transfer in stratified subsurfacematerials[J]. AppliedThermal Engineering,2018,135:228 237
[15]刘方,翁庙成,龙天渝.CFD基础及应用[M].重庆:重庆大学出版社,2015:33
[16]孔磊.螺旋型地埋管换热器换热性能的研究[D].扬州:扬州大学,2015:43 44
[17]马娟.土壤耦合热泵系统的长周期运行特性研究[D].南京:南京理工大学,2009:29 30
[18]王勇,谢烨,李文欣.武汉与重庆典型地质结构下的地埋管换热性能[J].土木建筑与环境工程,2017,39(4):17 25
[19]ASHRAE. ASHRAEhandbook—HVAC applications[M].Atlanta:ASHRAE Inc,2011:34
[20]LI W,LI X, WANG Y,et al. An integrated predictive model of the long-term performance of ground source heat pump(GSHP)systems[J].Energy and Buildings,2017,159:309 318