地热直接与间接供热系统的热特性比较  

THERMAL PERFORMANCE COMPARISON BETWEEN DIRECT AND INDIRECT GEOTHERMAL DISTRICT HEATING SYSTEMS

作　　者：戴传山[1] 梁军[1] 孙平乐[1] 

机构地区：[1]天津大学天津地热研究培训中心

出　　处：《太阳能学报》1998年第3期303-306,共4页Acta Energiae Solaris Sinica

摘　　要：对直接和间接地热供热系统的热力特性进行比较计算，提出两者相对热效率概念及其计算方法，同时分析一些主要参数对间接式供热系统相对热效率的影响，为地热供热系统的决策、设计、优化和控制提供理论依据。A thermal performance comparison between direct and indirect geothermal district heating systems has been made in the paper.The concept of relative thermal efficiency is proposed,which is the product of the minimum required flowrates ratio of the direct system to that of the indirect system for a same well and operating at the same conditions and the relative efficiency of the indirect system itself.An optimum operating comdition exists for indirect geothermal district heating systems which corresponds to the optimum relative efficiency η opt .The relative thermal efficiency is determined by both η opt and the shift status from the optimum condition.The effects of some parameters such as the over heat load factor,outdoor temperature and the number of plates of PHE on the relative thermal efficiency are discussed as well.

关 键 词：地热供热 间接式 板式换热器 相对热效率 供热 

分 类 号：TU833.3[建筑科学—供热、供燃气、通风及空调工程] TK529[动力工程及工程热物理—热能工程]