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氯化镁溶液太阳池的动态研究 被引量:2
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作者 蒙沛南 郑宏飞 +7 位作者 周科 卢颖纶 李道宪 许少杰 洪军 吴道宏 何小荣 邓鼎勋 《太阳能学报》 EI CAS CSCD 北大核心 1993年第3期266-273,共8页
对广西大学圆形斜壁氯化镁溶液太阳池的动态运行过程进行了长期的观察和测试,并对不同系统的提热量和换热速率进行了分析和计算。
关键词 氯化镁 太阳池 动态研究 集热 蓄热 热量换热率
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Thermal Response Test for Kelix GHE System
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作者 Ron Xia Gino Di Rezze 《Journal of Energy and Power Engineering》 2013年第6期1066-1072,共7页
The performance of a BTES (borehole thermal energy storage) system is primarily governed by ground heat flux, soil thermal properties and groundwater conditions. However, the design of the heat exchanger used within... The performance of a BTES (borehole thermal energy storage) system is primarily governed by ground heat flux, soil thermal properties and groundwater conditions. However, the design of the heat exchanger used within the BTES system can also make a significant difference in the efficiency of the system. A thermal response test was carded out for a Kelix GHE (ground heat exchanger) system, the latest innovation in geothermal ground loop construction, on an Ecofarm in the town of Caledon East, Ontario, Canada. In addition, a verifying test was performed for a CEES (conventional earth energy system) located 6 m away from the Kelix GHE. The boreholes for these two different heat exchanger designs were drilled with the same diameter, to the same depth and were located in the same/identical geo-hydrological conditions. The response test provided the effective average of undisturbed ground temperature, geothermal properties including thermal conductivity, heat capacity and thermal resistance between the fluid and the borehole wall. The mathematical analysis method used for the response test is presented here. Results of the response test were verified, analyzed and are further discussed. 展开更多
关键词 Response test Kelix GHE CONDUCTIVITY thermal resistance heat pump ground source energy system.
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Constructal optimization for H-shaped multi-scale heat exchanger based on entransy theory 被引量:16
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作者 FENG HuiJun CHEN LinGen +1 位作者 XIE ZhiHui SUN FengRui 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第2期299-307,共9页
Analogizing with the definition of thermal efficiency of a heat exchanger,the entransy dissipation efficiency of a heat exchanger is defined as the ratio of dimensionless entransy dissipation rate to dimensionless pum... Analogizing with the definition of thermal efficiency of a heat exchanger,the entransy dissipation efficiency of a heat exchanger is defined as the ratio of dimensionless entransy dissipation rate to dimensionless pumping power of the heat exchanger.For the constraints of the total tube volume and total tube surface area of the heat exchanger,the constructal optimization of an H-shaped multi-scale heat exchanger is carried out by taking entransy dissipation efficiency maximization as optimization objective,and the optimal construct of the H-shaped multi-scale heat exchanger with maximum entransy dissipation efficiency is obtained.The results show that for the specified total tube volume of the heat exchanger,the optimal constructs of the first order T-shaped heat exchanger based on the maximizations of the thermal efficiency and entransy dissipation efficiency are obviously different with the lower mass flow rates of the cold and hot fluids.For the H-shaped multi-scale heat exchanger,the entransy dissipation efficiency decreases with the increase in mass flow rate when the heat exchanger order is fixed;for the specified dimensionless mass flow rate M(M<32.9),the entransy dissipation efficiency decreases with the increase in the heat exchanger order.The performance of the multi-scale heat exchanger is obviously improved compared with that of the single-scale heat exchanger.Moreover,the heat exchanger subjected to the total tube surface area constraint is also discussed in the paper.The optimization results obtained in this paper can provide a great compromise between the heat transfer and flow performances of the heat exchanger,provide some guidelines for the optimal designs of heat exchangers,and also enrich the connotation of entransy theory. 展开更多
关键词 constructal theory thermal efficiency entransy dissipation efficiency H-shaped multi-scale heat exchanger generalizedthermodynamic optimization
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