散热器恒温阀控制有效性的模拟分析研究  

Simulation and Analysis on Control Effectiveness of TRVs in District Heating System

作　　者：徐宝萍[1] 郝玲[1] 付林[2] 狄洪发[2] 

机构地区：[1]中国建筑设计研究院,北京100044 [2]清华大学建筑学院建筑技术科学系,北京100084

出　　处：《建筑科学》2010年第2期80-83,102,共5页Building Science

摘　　要：本文以实际建筑及安装恒温阀的供热系统为研究对象，建立了热力水力综合仿真模型，进行了多工况模拟，分析了恒温阀对不同原因：流量分配不均、散热器面积过大和供水温度过高）引起的过热现象的改善程度，进而探讨了适合新型供热系统的运行调节方式。主要结论为：当恒温阀设置档位为2～3时，恒温阀改善过热的有效性与过热原因及过热程度有关；对流量偏大引起的过热损失的控制有效性小于0．6，对供水温度偏高及散热器面积偏大引起的过热损失的控制有效性约为0．8；过热损失越大，应用恒温阀后的节能潜力越大，但仍有约20％-40％的过热损失需要从改善不合理的运行调节和设计角度去解决。基于上述分析，本文提出水泵定压差变频运行、并以系统流量变化为反馈量分日调节供水温度的策略，从而适应系统负荷变化，并可将系统流量控制在较合理范围内。In this paper, taking an existing building and heating system with thermostatic radiator valves （TRVs） as the research object,an integrated model was developed for simulating the thermal and hydraulic behavior of the heating system under various operation conditions. According to the simulation results,TRVs effectiveness for reducing the overheating phenomena which were caused by uneven distribution of flow rate, oversize radiator area and overtop supply water temperature was studied, also the proper control strategies to create an energy-saving and comfortable environment were proposed. It was firstly concluded that when the set value of TRVs was kept at 2 - 3, TRVs effectiveness for reducing the overheating phenomena depended on the overheating reasons and overheating degree. Secondly,if the overheating loss was caused by the larger ilowrate,the control effectiveness was less than 0. 6,while if the overheating loss was caused by the overtop water temperature and oversize radiation area, the control effectiveness was around 0. 8. Thirdly, the more the overheating loss was, the more was the energy conservation potential when TRVs was adopted. However,about 20% to 40% overheating loss should be solved through ameliorating the improper operation adjustment and design. Based on the analysis, the following strategy was put forward：the pump was operated with frequency conversion and constant pressure different, and the supply water temperature was daily adjusted according to the flow performance of the system. Therefore, the adaptation of system load change and limitation of the system flow within an appropriate range could be achieved.

关 键 词：散热器恒温阀 控制有效性 过热 模拟 控制策略 

分 类 号：TU832.24[建筑科学—供热、供燃气、通风及空调工程]