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Performance analysis of U-vertical direct-expansion ground-source heat pump 被引量:1
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作者 杨伟 周晋 张国强 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期209-211,共3页
The performance of a direct-expansion ground-source heat pump(DX GSHP)system is theoretically analyzed.Compared with the conventional ground-source heat pump(GSHP),the DX GSHP has a lower condensing temperature in... The performance of a direct-expansion ground-source heat pump(DX GSHP)system is theoretically analyzed.Compared with the conventional ground-source heat pump(GSHP),the DX GSHP has a lower condensing temperature in the cooling mode and a higher evaporating temperature in the heating mode,and the ground heat exchanger(GHE)in the DX GSHP has a low thermal resistance.Therefore,the coefficient of performance(COP)of the DX GSHP is higher than that of the GSHP.In addition,the system performance of the DX GSHP system is higher than that of the conventional GSHP system because there are no secondary solution loops and water circulating pumps in the DX GSHP system.The experimental energy performance of the DX GSHP system is also investigated based on the actual operational data.The tested DX GSHP system is installed in Xiangtan,China.The U-vertical GHE of the DX GSHP is buried in a water well.The length and the outside nominal diameter of the GHE are 42 m and 12.7 mm,respectively.The experimental results show that the maximum(COP)and the average COP of the DX GSHP system in the heating mode are 5.95 and 4.72,respectively. 展开更多
关键词 direct-expansion ground-source heat pump energy consumption analysis PERFORMANCE
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Thermal comfort assessment and energy consumption analysis of ground-source heat pump system combined with radiant heating/cooling 被引量:1
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作者 路诗奎 张小松 《Journal of Southeast University(English Edition)》 EI CAS 2012年第1期52-57,共6页
A new ground source heat pump system combined with radiant heating/cooling is proposed, and the principles and the advantages of the system are analyzed. A demonstration of the system is applied to a rebuilt building... A new ground source heat pump system combined with radiant heating/cooling is proposed, and the principles and the advantages of the system are analyzed. A demonstration of the system is applied to a rebuilt building: Xijindu exhibition hall, which is located in Zhenjiang city in China. Numerical studies on the thermal comfort and energy consumption of the system are carded out by using TRNSYS software. The results indicate that the system with the radiant floor method or the radiant ceiling method shows good thermal comfort without mechanical ventilation in winter. However, the system with either of the methods should add mechanical ventilation to ensure good comfort in summer. At the same level of thermal comfort, it can also be found that the annual energy consumption of the radiant ceiling system is less than that of the radiant floor system. 展开更多
关键词 ground-source heat pump radiant heating/cooling thermal comfort energy consumption
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Experimental Investigation on System with Combination of Ground-Source Heat Pump and Solar Collector 被引量:4
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作者 胡涛 朱家玲 张伟 《Transactions of Tianjin University》 EI CAS 2013年第3期157-167,共11页
This paper presents the heating performance and energy distribution of a system with the combination of ground-source heat pump and solar collector or a solar-assisted ground-source heat pump system (SAGSHPS) by calcu... This paper presents the heating performance and energy distribution of a system with the combination of ground-source heat pump and solar collector or a solar-assisted ground-source heat pump system (SAGSHPS) by calculation and experiment.The results show that the average absolute error is less than 0.6 ℃ and the relative error is less than 5% under the pulse load when the analytical solution to the 2-D solid cylindrical source model is used for the SAGSHPS.The coefficient of performance (COP) of the SAGSHPS is 2.95-4.70.The average fluid temperature in the borehole heat exchanger can increase by 3 ℃ with the assistance of solar collector,which will improve the COP of the heat pump by approximately 10% from the experimental data.The energy contributions to the total heating load of soil,electricity and solar are 56.30%,36.87% and 6.83%,respectively. 展开更多
关键词 ground-source heat pump solar energy heating performance BOREHOLE heat EXCHANGER
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Research on Performance of Ground-Source Heat Pump Double U Underground Pipe Heat Exchange 被引量:1
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作者 Youyin Jing Jing Hou Peng Yang 《Open Journal of Modelling and Simulation》 2013年第1期1-6,共6页
This paper uses FLUENT software building the three-dimensional unsteady state model of ground source heat pump single U and double U underground pipe to study on heat exchange of underground pipe system in the conditi... This paper uses FLUENT software building the three-dimensional unsteady state model of ground source heat pump single U and double U underground pipe to study on heat exchange of underground pipe system in the condition of unsteady state long-term continuous running, analyzes the change of soil temperature filed around underground pipe and performance of underground pipe heat exchange between single U and double U pipe system. The results show that double U pipe system is better than single U system, which can improve unit depth heat exchange efficiency, reduce the number of wells and reduce the initial investment. 展开更多
关键词 ground-source heat pump DOUBLE U UNDERGROUND PIPE heat Exchange Soil Temperature Field
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Heat flow balance and control strategies for a large GSHP
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作者 陈义波 陈九法 +2 位作者 Umberto Berardi 乔未来 陈军伟 《Journal of Southeast University(English Edition)》 EI CAS 2013年第1期92-98,共7页
The possibility of underground imbalance between heat emission and absorption has a negative impact on the performance of ground-source heat pump systems (GSHPs). Numerical and experimental researches were made in a... The possibility of underground imbalance between heat emission and absorption has a negative impact on the performance of ground-source heat pump systems (GSHPs). Numerical and experimental researches were made in a residential building, which is supplied with a GSHP system and a ceiling radiation system combined with a replacement fresh air system. EnergyPlus simulations were used to estimate heating and cooling loads, and to assess the heat generated from the water pump, the fan and the heat pump unit. Then, Fluent simulations were used to compare three different control strategies of handling the underground heat exchange. These simulations were strongly based on an experimentally verified model. It is obtained that a ratio between cooling and heating loads is 5.08 : 1 in a case study in Nanjing. Moreover, the control strategy based on the starting time is more efficient and reliable than the temperature and temperature difference strategies to control the underground heat exchange. 展开更多
关键词 ground-source heat pump system residential building heat balance control strategy
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Numerical simulation on heat transfer performance of vertical U-tube with different borehole fill materials 被引量:2
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作者 刘方 郭涛 +1 位作者 王勇 翁庙成 《Journal of Central South University of Technology》 EI 2006年第3期234-237,共4页
Heat exchange performance of vertical U-tube heat exchanger was studied with two different borehole fill materials and CFD software. Borehole surface temperature and water temperature distribution were simulated on th... Heat exchange performance of vertical U-tube heat exchanger was studied with two different borehole fill materials and CFD software. Borehole surface temperature and water temperature distribution were simulated on the condition of continuous operation for 8 h in winter with inlet water temperature being 10℃. The results show that there is no obvious difference on heat exchanger performance between the two different borehole fill materials. 展开更多
关键词 vertical U-tube heat exchanger ground-source heat pump numerical simulation
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Techno-economic analysis of single U-tube and double U-tube heat exchangers in Chongqing area 被引量:1
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作者 王勇 郭凯生 +3 位作者 田荣 韩传璞 赖道新 徐峰 《Journal of Central South University》 SCIE EI CAS 2009年第S1期244-248,共5页
On the basis of practical projects in Chongqing,the thermal performance of heat exchangers (single U-tube type and double U-tube type) of the ground-source heat pump (GSHP) system in the hot summer was obtained and an... On the basis of practical projects in Chongqing,the thermal performance of heat exchangers (single U-tube type and double U-tube type) of the ground-source heat pump (GSHP) system in the hot summer was obtained and analyzed. The data obtained from test could match with the result deduced from theoretical calculation. From the test results,the cooling capacity of double U-tube is 1.6 times that of single U-tube. Taking cost per depth per watt Clq as the evaluation standard,Clq of single U-tube is 4.69 RMB$/W,and Clq of double U-tube is 3.14 RMB$/W. The double U-tube heat exchangers usage should be prioritized. 展开更多
关键词 ground-source heat pump heat transfer performance SINGLE U-TUBE DOUBLE U-TUBE TECHNO-ECONOMIC analysis
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Efficiency of Vertical Geothermal Heat Exchangers in the Ground Source Heat Pump System 被引量:32
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作者 HeyiZeng NairenDiao 《Journal of Thermal Science》 SCIE EI CAS CSCD 2003年第1期77-81,共5页
Taking the fluid temperature distribution along the borehole depth into account, a new quasi-three-dimensional model for vertical ground heat exchangers has been established, which provides a better understanding of t... Taking the fluid temperature distribution along the borehole depth into account, a new quasi-three-dimensional model for vertical ground heat exchangers has been established, which provides a better understanding of the heat transfer processes in the geothermal heat exchangers. On this basis the efficiency of the borehole has been defined and its analytical expression derived. Comparison with the previous two-dimensional model shows that the quasi-three-dimensional model is more rational and more accurate to depict the practical feature of the conduction of geothermal heat exchanger, and the efficiency notion can be easily used to determine the inlet and outlet temperature of the circulating fluid inside the heat exchanger. 展开更多
关键词 ground-source heat pump conduction heat exchanger efficiency.
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上海地区地源热泵系统对地质环境热影响的模拟分析 被引量:7
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作者 魏静 《暖通空调》 北大核心 2015年第2期102-106,共5页
根据上海地区某实际工程的实测数据,将土层概化为7层,并建立了物理模型。对冷热负荷不平衡条件下地源热泵系统运行10a后的换热区土壤温度场特征进行了模拟分析。结果表明,10a后换热区平均土壤温度升高约2.44℃,土壤温度升幅随土层深度... 根据上海地区某实际工程的实测数据,将土层概化为7层,并建立了物理模型。对冷热负荷不平衡条件下地源热泵系统运行10a后的换热区土壤温度场特征进行了模拟分析。结果表明,10a后换热区平均土壤温度升高约2.44℃,土壤温度升幅随土层深度的增加逐渐减小;换热区热扩散半径随时间呈直线增加,10a后平均热扩散半径为20m左右,浅部土层热扩散半径较大。 展开更多
关键词 地源热泵 浅层地热能 地质环境 土壤温度场 热影响 热扩散半径 ground-source heat pump (GSHP)
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