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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, the actual construction and installation of thermostatic valve heating system for the study, the establishment of a comprehensive simulation model of thermodynamic and hydraulic, multi-mode simulation, analysis of the thermostatic valve for different reasons (uneven flow distribution, radiator area is too large and water supply Temperature overheating) caused by the overheating of the degree of improvement, and then explored suitable for the new heating system operating mode of adjustment. The main conclusions are as follows: when the thermostatic valve setting gear is 2 ~ 3, the effectiveness of the thermostatic valve to improve overheating is related to the cause of overheating and the degree of overheating; the effective control over the overheat loss caused by large flow is less than 0.6, The control effectiveness of the overheat loss due to the high heat sink area and the large heat sink area is about 0.8. The greater the overheating loss is, the greater the energy saving potential is. However, about 20% ~ 40% of the overheat loss still needs to be improved Reasonable operation regulation and design point of view to solve. Based on the above analysis, this paper proposes a variable frequency pump running at constant pressure, and the system flow changes for the feedback volume points to adjust the water supply temperature strategy to adapt to system load changes, and the system flow can be controlled within a reasonable range.