Air conditioning by using vapor compression cycle is the most commonly used system although its operating energy cost is significantly high. Liquid desiccant dehumidifier with Indirect Evaporative Cooling (IEC) is another alternative suitable for hot and humid climatic conditions. The system works in two parts. In liquid desiccant dehumidifier section, moisture from humid air is removed and such air is passed through Indirect Evaporative Cooling system where air is cooled. An attempt was made to set up an experimental module with Scheffler solar concentrator to provide thermal energy for evaporation of liquid desiccant while a new type of polymer plate exchanger was used in evaporative cooling section instead of commonly used metal heat exchanger. The experimentation was carried using CaCl2 desiccant with varying flow rates between 2 and 4 l/min in dehumidifier section and reduction of relative humidity by 4 to 9% was achieved. As desiccant flow rate was increased, it resulted into higher carry over losses. Experimentally, it was found that for a flow rate of 3 l/min, the carry over losses are minimum. For this flow rate of desiccant, secondary-to-primary-air ratio of 0.8, water flow rate of 11 l/min, and air cooling by 4.7°C were achieved. Maximum wet bulb and dew point effectiveness were found to be 0.61 and 0.42, respectively, for secondary-to-primary-air ratio of 0.8. It could be concluded that a polymer plate heat exchanger-based system could be considered as efficient system than metal plate heat exchanger systems, because longer life, lighter weight, and low operating cost are the characteristics of polymers. © 2021 Taylor & Francis Group, LLC.