TRNSYS ANALYSIS OF ENERGY-SAVING PERFORMANCE IN EARTH-TO-AIR HEAT EXCHANGERS COUPLED WITH BUILDING FRESHAIR SYSTEMS

摘要

This paper performs the energy-saving performance simulation of earth-to-air heat exchangers (EAHEs) coupled with building fresh air systems based on the software TRNSYS, considering typical weather parameters in Northern China. The results show that compared with the conventional fresh air systems, the introduction of EAHEs as well as heat recovery heat exchangers (HRHEs) can greatly improve the energy-saving potential of the whole fresh air system. In the present case, the highest energy efficiency factor ranges from 0.86 to 0.92, and the lowest annual energy consumption for space heating and cooling is 47.2kWh/m~2, decreased by 31.4% compared with the conventional fresh air systems without EAHEs and HRHEs. The present results can provide a useful guide for the design and optimization of fresh air systems in energy efficient buildings under similar climate regions.