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本文在热管平板集热器传热分析的基础上,对铝-丙酮和铝-氨重力热管(无芯网或槽道的光管)在太阳能平板集热器的热流密度下的传热特性进行了实验研究,发现热管工质的最佳充装量约为25％左右。实验表明,在低热流密度条件下,热管蒸发段的换热系数较低,集热器系统的设计又不允许热管有过长的冷凝段,使热管对载热质的总传热系数略低于常规平板集热器流道中的对流换热系数。故热管集热器的效率因子将略低于同类型常规集热器。实验结果还指出,热管集热器的热容小,起动快,它的全日效率略高于常规集热器。重力热管集热器系统能防冻、防腐,其热性能优于双回路系统,有进一步研制的价值。
In this paper, based on the heat transfer analysis of the heat pipe flat-plate heat collector, the heat transfer characteristics of aluminum-acetone and aluminum-ammonia gravitational heat pipe (coreless or slotted light pipe) The experimental study found that the best charge of heat pipe refrigerant about 25%. Experiments show that the heat transfer coefficient of the heat pipe evaporation section is low under low heat flux density and the design of the heat collector system does not allow the heat pipe to have a long condensation section so that the total heat transfer coefficient of the heat pipe to the heat carrier is slightly lower Convection heat transfer coefficient in conventional flat collector flow path. Therefore, the heat pipe efficiency factor will be slightly lower than the same type of conventional collector. The experimental results also pointed out that the thermal tube collector heat capacity is small, fast start, its full-day efficiency slightly higher than the conventional collector. Gravity heat pipe collector system can antifreeze, anti-corrosion, its thermal performance is superior to double loop system, there is further development of value.