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.
Design of packed, adiabatic absorbers: Physical absorption of acid gases in methanol
An algorithm was developed to calculate concentration and temperature profiles for an adiabatic, packed absorber. Calculations performed with this algorithm compared favorably with data obtained on a pilot scale absorber having a diameter of 0.127 m (5 in.) and packed with 6.25-mm (0.25 in.) ceramic Intalox saddles. The data were obtained for absorption of acid gases from a stream produced from cylinder gases and by coal gasification; refrigerated methyl alcohol was the solvent used in the absorber. The systems examined considered both single-component transfer and multicomponent absorption. The data obtained in this study are thought to be the only data available in the literature for multicomponent, adiabatic packed column absorption for which reasonable mass and energy balance closures were obtained. Several correlations for mass transfer coefficient-interfacial area estimation were tested against experimental data.
Performance and operational analysis of a liquid desiccant open-flow solar collector
An open-flow solar collector consisting of a 2500 square foot sloping roof, shingled with asphalt tiles, was constructed and instrumented. The operation of the roof as a solar energy collector with a concentrated solution of lithium chloride as the energy storage medium was monitored during the summer months of 1981. Data obtained from the operational tests were compared with the results of computer models of the collector. The operational data compare well with the results of the computer models and show that such collectors can operate at 30 to 40 percent evaporation efficiencies under high solar flux conditions with a roof installed cost of $2.00 per square foot.