除湿转轮的数学模型及瞬态响应性能实验

建立了除湿转轮的传热传质模型，模型中考虑了基体材料蓄热对传热传质的影响；搭建了进行变风量运行工况下转轮瞬态响应性能研究的实验台．模拟并实验研究了变风量运行方式下除湿转轮的瞬态响应性能，对转轮数学模型的可靠性进行了验证，对除湿空调系统可节省的显热负荷进行计算．结果表明，处理风速阶跃减小时，处理空气出口相对湿度随时间逐渐减小，温度升高，再生空气温度和相对湿度分别呈小幅上升和减小的趋势，响应时间约1h；风速阶跃增加时，处理空气出口相对湿度随时间增大，温度降低，再生空气温度和相对湿度相应呈小幅下降和增大的趋势，响应时间约40min．计算表明，变风量运行方式可节省除湿空调系统显热负荷约20%，若通过调节再生风速和风温，可进一步节省显热负荷约13％．模拟的瞬态响应曲线与实验曲线较为一致，模拟误差在10％以内．

Numerical Simulation and Experimental Research on Transient Response of Rotary Desiccant Wheel

Mathematical model of rotary desiccant wheel was established considering effect of basis material thermal storage on heat and mass transfer. The transient response rules of rotary desiccant wheels were experimentally studied under step change of process air volume. Mathematical model was experimentally verified. Sensible heat load that can be saved was calculated. Results demonstrate that while process air volume step decreases, relative humidity ratio of process outlet decreases with time and temperature increases until reaching a new steady-state. Accordingly, regeneration outlet temperature and relative humidity ratio increases and decreases a little respectively,and response time is about 1 hour. While process air volume step increases, relative humidity ratio of process outlet increases with time and temperature decreases ,and accordingly regeneration outlet temperature and relative humidity ratio decreases and increases a little respectively,and response time is about 40 min. Calculation indicates that step change of process air volume makes sensible heat load drop 20%,and 13%, more can be reduced by changing regeneration air volume and temperature. The numerical curve exhibits very good agreement with experimental results ,and simulation error is less than 10%.