Abstract:
Conventional Vapor Compression system fails to provide comfort conditions in humid areas where it is important to control the latent load of the environment as it deals with the sensible load only. Moreover, the refrigerants used in the conventional system not only contribute in depleting the ozone layer in stratosphere but also directly contributing in the global warming when released in the atmosphere. Desiccant Based Evaporative Cooling system has the potential to be a very reasonable alternative to conventional system. It has the potential to deal with the sensible and latent load both but is also environmental friendly as it involved the use of only desiccant material and not any sort of refrigerant. Air can be conditioned in a cleaner and affordable method using a Desiccant Based Evaporative Cooling system. The objective of this work is to design and develop a solid desiccant based evaporative cooler to control both sensible and latent load in hot and humid environment. The system was developed and evaluated for the climate of Karachi, Pakistan and solved on TRNSYS® software. The results evaluated on the TRNSYS software have been compared with the literature review and with the results obtained from the simulator designed by NOVEL Aire. It is found that lower temperature of the conditioned space is achieved on recirculation mode of the cycle as compared to the ventilation mode. The system consists of solid Desiccant Based dehumidifier for the extraction of the moisture from the air, a heat recovery wheel to lower the temperature after desiccant wheel, a heater to heat the regeneration air and evaporative coolers.
