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

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 7.2 years. 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.