转轮式全热回收器的数学模型与变工况性能分析

Mathematical Model and Performance Analysis with Variable Condition of Enthalpy Recovery Wheel

建立了转轮式全热回收器的数学模型,与现有文献对比验证了该模型的正确性,并利用此模型研究了迎面风速、新排风比、新风温度(含湿量不变或相对湿度不变)、新风含湿量的变化对转轮热回收效率的影响.结果表明,随迎面风速的增大,转轮的显热效率、潜热效率与全热效率均降低;随排风量与新风量之比增大,或新风温度的升高(相对湿度不变时),转轮的显热效率、潜热效率与全热效率均增大;随新风温度的升高(含湿量不变时),转轮的显热效率增大,潜热效率与全热效率降低;随新风含湿量增大,转轮的显热效率不变,潜热效率与全热效率升高.

The mathematical model of enthalpy recovery wheel was built and verified by comparison with existing literatures, based on which, the effects of air velocity, proportion of fresh air and exhaust air, fresh air temperature （when humidity ratio is constant or relative humidity is constant）, fresh air humidity ratio on the heat recovery efficiency of enthalpy recovery wheel were investigated. The results show that the sensible heat efficiency, latent heat efficiency and total heat efficiency of enthalpy recovery wheel decrease with increasing of air velocity; when proportion of fresh air and exhaust air increases, or fresh air temperature increases （relative humidity is constant）, and the sensible heat efficiency, latent heat efficiency and total heat efficiency increase, too; with increasing of fresh air temperature （humidity ratio is constant ）, the sensible heat efficiency increases, while the latent heat efficiency and total heat efficiency decrease; when fresh air humidity ratio increases, the sensible heat efficiency remains constant, while the latent heat efficiency and total heat efficiency increase.