Three kinds of solid desiccant dehumidifier are compared

which are desiccant wheel dehumidifier

heat pump driven inner-cooling desiccant dehumidifier

and heat pump driven multi-stage desiccant dehumidifier.Mathematical models of desiccant wheel and multi-stage desiccant dehumidifiers are set up and validated by experimental results.The dehumidification performance of the three dehumidifiers shows that the inner cooling desiccant method gives the best heat and mass transfer process

while the desiccant wheel dehumidifier is the worst.Regeneration temperature of desiccant wheel is usually above 80℃

while that of inner cooling desiccant bed and multi-stage desiccant bed are both below 50℃.To obtain the same humidity ratio of the supplied air

air states of desiccant wheel is near isenthalpic line with high supplied air temperature

while the COP of inner cooling desiccant bed and multi-stage desiccant bed is above 4 with low supplied air temperature.