Analysis of thermal effects in packed bed liquid desiccant dehumidifiers
Abstract An analysis of the performance of a packed bed liquid desiccant dehumidifier is presented. The enthalpy and material balance equations written over a differential height of the bed incorporate the effect of the heat of dilution of the desiccant liquid, the liquid—air interface temperature and the fraction of the evolved heat that is accounted for in the air stream. Numerical results obtained are discussed in terms of the physical and operating parameters of the system.
Adiabatic gas absorption in packed columns with large thermal effects
The performance of packed bed adiabatic gas absorbers has been analyzed using the enthalpy and material balance equations incorporating a new parameter, f r , defined as the fraction of the heat of absorption that is accounted for in the gas stream. An experimental programme to evaluate f r was carried out and the data correlated. It was found that f r was dependent on the thermo-physical properties and the hydrodynamic conditions. It is postulated that the mechanism by which this heat transfer occurs is by turbulence at the interface and by entrainment
Optimization of Liquid Desiccant Systems for Solar/Geothermal Dehumidification and Cooling
Two efficient design configurations of a liquid desiccant cooling/dehumidification system that can be powered by low grade solar or geothermal energy and promise low parasitic power requirements for blowers and pumps are proposed and analyzed in this work. A mathematical model for each component in this system has been developed and synthesized for system simulation. The system performance is predicted and optimized through parametric studies using the computer code LIQSYS. It is shown that the exhaust recirculation mode (ERM) gives better performance at full capacity while the process recirculation mode (PRM) produces cooler and drier air.