太阳能热水系统防过热策略研究  

Overheating Protection Strategy for Solar Water Heating System

作　　者：刘剑[1] LIU Jian(East China Architectural Design and Research Institute CO.,LTD,Shanghai 200011,China)

机构地区：[1]华东建筑设计研究院有限公司,上海200011

出　　处：《建筑节能（中英文）》2022年第1期102-106,共5页Building Energy Efficiency

基　　金：“十三五”国家重点研发计划资助项目:既有城市工业区能源及废弃物资源利用技术研究(2018YFC0704905)。

摘　　要：针对太阳能热水系统的各类防过热措施进行了梳理和优缺点分析,并结合各类措施的适用性,给出了紧凑式系统和分体式系统的适宜防过热措施。对于集中式太阳能热水系统,通过建立动态分析模型,量化地分析了不同系统形式、太阳能保证率及部分负荷使用率对系统过热性能的影响。分析结果及实施建议为:在相同的太阳能保证率和部分负荷使用率条件下,分散辅热的系统形式比集中辅热具备更好的防过热性能;相比较于高太阳能保证率,运营阶段的实际部分负荷使用率低于20%是造成系统过热的主要原因;对于低部分负荷工况运行时段较长的项目,建议通过季节性调节蓄热水箱的蓄水量、采用双水箱系统等措施增加系统的热缓冲能力,或优化集热器阵列的连接管路,使其具备部分集热器组件短接或旁通运行的模式。The advantages and disadvantages of various overheating protection measures for solar water heating system were summarized and analyzed,as well as the appropriate measures for the compact and split-type system based on the applicability of the measures.For the centralized solar water heating system,dynamic analysis models were established to quantitatively analyze the influence of different system types,solar fraction and partial load utilization rate on the overheating protection performance of the system.The analysis and suggestions indicate that:in the same condition of solar fraction and partial load utilization rate,the decentralized auxiliary heating system has better overheating protection performance than the centralized heating system;compared with the high solar fraction,that the actual partial load utilization rate in operation period is less than 20%is the main reason for overheating;for the project with long operation period under low partial low utilization rate,it is suggested to increase the thermal buffer capacity of the system by adjusting the storage capacity of the water tank seasonally or adopting the double water tank system or optimize the pipeline of the solar collector array to make it work on the mode of short circuit or bypass of some collectors.

关 键 词：太阳能热水系统 过热防护 辅助加热模式 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程] TK511.2[动力工程及工程热物理—热能工程]