基于高分子透湿膜的全热回收器的试验研究

摘要

利用透湿膜设计制造了一台平行流道结构的全热换热器,并在焓差实验室对其进行性能测试.试验研究了室内侧的干球温度27℃,湿球温度19℃的条件下,迎面风速变化、新风温度变化、新风相对湿度变化时对全热换热器的显热效率、潜热效率、阻力的影响.实验研究表明,在较高的迎面风速的条件下,全热换热器仍然具有较高的显热效率和潜热效率.显热效率和潜热效率分别在70％～85％和60％ ～ 75％之间.温度和湿度变化对显热效率的影响很小,而对潜热效率的影响很大.随着新风的温度和相对湿度的增大,潜热效率也随着增大.在炎热潮湿的气候条件下,基于高分子透湿膜的全热回收器具有较高的显热效率和潜热效率,表明了这种换热器在南方地区具有较好的应用前景.%A parallel - structure total heat recovery is fabricated and designed with PVDF membrane. Experiments are conducted under variable operating conditions in the psychrometric calorimeter chamber. The effects of varying operating conditions like air velocity, temperature and air humidity on the sensible effectiveness, latent effectiveness and pressure drop are evaluated with indoor exhaust air dry bulb 27℃ , wet bulb 19 ℃. The membrane-based total heat recovery has a high sensible and latent effectiveness under high air velocity. The sensible and latent effectiveness are 70% ～85% and 60% ～75% , respectively. The fresh air temperature and relative humidity have little effect on sensible effectiveness. However, the fresh air temperature and relative humidity have a great effect on latent effectiveness. The latent effectiveness increases with an increase of the fresh air temperature and relative humidity. The membrane-based total heat recovery has a high sensible and latent effectiveness under hot and humid condition. The results show that the membrane-based total heat recovery has a promise in south China.