自然冷却节能潜力的修正度时数评价方法

A revised degree hours evaluation method for energy saving potential of free cooling systems

为了充分利用室外自然冷源降低建筑空调能耗,准确评价自然通风的潜力,指导更多自然冷却系统的选择利用,提出采用修正度时数方法对不同自然冷却方式的节能潜力进行评价。通过与度时数法的比较,说明了修正度时数法的概念和合理性,利用TRNSYS软件构建自然冷却系统模型分析和验证了修正度时数计算结果的合理性。结果表明:修正度时数能够兼顾换热温差以及换热能效,修正度时数与系统节能量之间存在直接关系,可对不同自然冷却方式的应用潜力进行对比评价,指导不同自然冷却方式的选择,助力制冷空调系统的低碳发展。

In order to make full use of outdoor free cooling sources to reduce building air conditioning energy consumption,accurately evaluate the potential of natural ventilation,and guide the selection and utilization of more free cooling systems,a revised degree hours method was proposed to evaluate the energy-saving potential of different free cooling methods.The conception and rationality of the method are indicated by comparing with the degree hours method.The free cooling system model was built by using TRNSYS software to analyze and verify the rationality of the calculated result of revised degree hours.The results show that the revised degree hours can take into account the heat exchange temperature difference and heat exchange efficiency,and there is a direct relationship between the revised degree hours and the system energy saving.It can compare and evaluate the application potential of different free cooling methods,guide the selection of different free cooling methods,and help the low-carbon development of refrigeration and air conditioning systems.