Research On Energy Saving Performance Of Energy Recovery System For Outdoor Air Handling Applied In Public Buildings

Public buildings are densely populated and have great requirement for outdoor air. With public buildings developing towards green and passive style, the proportion of outdoor air load in building load increases gradually, therefore the application of energy recovery system for outdoor air handling has great energy saving potential and is an important technology needed to be considered in the field of building energy conservation. However, energy recovery system for outdoor air handling is not always energy-efficient due to the added air resistance of the exchanger core. The factors influencing energy saving performance of energy recovery system for outdoor air handling are complicated, besides the performance parameters of energy recovery device itself, building use period, building load situation, outdoor temperature & humidity condition, control strategy and energy efficiency of air conditioning system are all important influencing factors, therefore energy saving performance of energy recovery system for outdoor air handling applied in public building is always a discussion focus in the building energy saving field.With the publication of Design Standard for Energy Efficiency of Public Buildings (GB 50189-2015), the performance of building envelope, the energy efficiency of air conditioning system and lighting system are all improved. How about the energy saving effect of energy recovery system for outdoor air handling applied in public building which meets the requirements of this standard is a matter of great concern in the building energy saving field, but no research about this issue has been done before.This paper selects an office building and a hotel building as the research objects, by using energy consumption simulation software TRNSYS, establishes typical building model and air conditioning system model which are satisfied with Design Standard for Energy Efficiency of Public Buildings (GB 50189-2015), studies the load difference of the building with and without energy recovery system, proposes an optimal control strategy, and calculates the air-conditioning energy consumption of the building with and without energy recovery system. Taking the air-conditioning energy consumption of the building without energy recovery system as the benchmark, it gives the air-conditioning energy saving rates of the building with energy recovery system, and gets the air-conditioning energy saving rate ranges of the office building and the hotel building with sensible heat recovery system and total heat recovery system in representative cities of cold zone (Beijing), hot summer & cold winter zone (Shanghai) and hot summer & warm winter zone (Guangzhou) in China. The study result shows that, under the premise of adopting the optimal control strategy, for different types of public buildings in different climatic zones, it can achieve the purpose of energy saving whether using sensible heat recovery system or total heat recovery system. After using energy recovery system, the building air-conditioning energy saving rates in cold zone are higher than it in hot summer & cold winter zone, the building air-conditioning energy saving rates in hot summer & cold winter zone are higher than it in hot summer & warm winter zone.