基于TRNSYS模拟的成都地区夏季空调排风全热回收适宜性动态分析

Dynamic analysis of exhaust air total-heat recovery of air conditioning system in summer condition of Chengdu using TRNSYS simulation

利用TRNSYS软件建立了平板式全热交换器的动态性能计算模型,利用动态焓效率计算方法,对成都地区夏季工况空调排风全热回收性能进行了模拟,计算了平板式全热交换器的逐时节能量,对全热回收在成都地区应用的适宜性进行了分析。结果显示:平板式全热交换器逐时焓效率波动较大,大部分时间逐时焓效率大于额定焓效率;采用动态焓效率计算方法得到的节能率为16.6%,采用额定焓效率计算方法得到的总节能量较动态焓效率法计算结果小11.9%;全热交换器只在每年6—8月运行时,投资回收期为7.2a。全热回收适宜在成都地区应用,为保证全热回收节能量计算的准确性,宜采用动态焓效率计算方法。

Establishes a calculation model of dynamic performance for flat-plate total-heat exchangers using TRNSYS software.Simulates the performance of exhaust air total-heat recovery of air conditioning system in summer condition of Chengdu using the dynamic enthalpy efficiency calculation method.Calculates the dynamic energy saving of the flat-plate total-heat exchanger,and analyses the suitability of total-heat recovery application.The results show that the enthalpy efficiency of the flat-plate total-heat exchanger fluctuates largely and is larger than the rated enthalpy efficiency in the most of time.Energy saving rate is 16.6% using the dynamic enthalpy efficiency method,and the total energy saving obtained by using rated enthalpy efficiency method is 11.9% lower than that using the dynamic enthalpy efficiency method.If the total-heat exchanger only works from June to August,the payback period of investment would be 7.2years.Concludes that total-heat recovery has good suitability in Chengdu,the dynamic enthalpy efficiency method should be used for calculation,in order to achieve high accuracy of total-heat recovery energy saving.