A mathematical model was developed in this work to predict the performance of a liquid desiccant absorber integrating indirect evaporative cooling to achieve an almost isothermal operation. A control volume based numerical method was used to solve the governing equations. A sensitivity analysis considering a lithium chloride solution, process air at 32 degrees C and 0.022 kg/kg humidity and return air at 23 degrees C and 0.009 kg/kg humidity was performed. Negligible differences in thermal performance were found between parallel and counter fluid flow arrangements. The study predicted a strong dependence of thermal performance on the physical size of the absorber, the solution concentration and cooling and process air mass flow rates. A partial load performance analysis was used to determine the operation of the proposed absorber when it was subjected to a variable cooling and dehumidification load. Enthalpy and humidity effectivenesses were defined to report the partial-load performance of the absorber. Both the effectivenesses were found to vary significantly only with the number of mass transfer units between the process air and the desiccant solution. Finally, a simple model was also developed to predict the performance of the proposed absorber for annual energy consumption estimates. The simple model showed a good agreement with the detailed model.