3th WCSET-2014 at Nepal

 

Mechanical Engineering / Sustainable Energy Session:

Title:            Energy Efficient Liquid Desiccant Cooling system
Authors:      Jagannath Korody, S. S. Sharma, Chandrashekhar Bhat, Achutha Kini, Raghavendra Prabhu P., Manish Agarwal
Abstract:     The refrigeration and air conditioning technology have been passing through a changing phase. The problems of ozone depletion and global warming have created a void in refrigeration and air conditioning industry which have led the refrigeration community to research for alternative refrigerants and alternative cooling technologies. Desiccant cooling systems combine dehumidification, heat recovery, evaporation and heating to create a cooling process which can offer energy savings compared to conventional air conditioning systems. It is one kind of innovative technologies which employs renewable energy to produce the desired air for comfortable working/living spaces. These systems have little dependency on fossil-fuel energy and are environment friendly. Desiccant cooling uses liquid or solid desiccant in order to dehumidify the processed air. By coupling with mechanical cooling, desiccant systems can avoid the need for reheat which is essential in conventional systems. Desiccant cooling has long been adopted for both industrial and agricultural purposes, and is now taking a more and more prominent role in the air-conditioning field. It is economical and haseffective humidity control at low and moderate temperatures since it makes full use of surface vapor press ure difference to realize moisture transfer between the process air and liquid desiccant. In the present paper, the heat and mass transfer in the various components of the desiccant system is analyzed and COP of the system is obtained by numerical simulation through theoretical model. The influence of air temperature, relative humidity, air flow rate, desiccant flow rate, desiccant concentration on the cooling capacity and COP of the system is studied. It is observed that when the cooling and heating is replaced by renewable energy, COP is greatly enhanced.

Keywords:   Desiccant, Dehumidifier, Regenerator, Heat exchanger
Pages:         365-370

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