EXPERIMENTAL STUDY OF HEAT & MASS TRANSFER IN LIQUID DESICCANT DEHUMIDIFIER - Softcover

Inhaltsangabe

The main requirements for comfortable and healthy indoor environment are adequate ventilation and good humidity control. Before the invention of air conditioning system to control indoor humidity, one would just open a window or door and is a moot exercise if it is humid or raining outdoors. Humidity control is important in many engineering applications, such as space air conditioning (AC), storage warehouses, process industries etc. Conventional air conditioners control humidity at the cost of lot of electricity. It is also responsible for ozone layer depletion and global warming. Cooling coil quenches air borne moisture by providing a cold dew point on the coil􀂶s surfaces for humidity condensation. Conventional cooling coil cannot effectively meet the latent loads on humid days. To control humidity dehumidification process is used. Dehumidification is the process of removing the moisture from air by application of desiccants. Desiccants are chemicals with great affinity for moisture and have ability to absorb inorganic, organic contaminants, kill germs and make the occupants feel healthier suffering from allergies. The basic objective of the present work is to understand the effect of inlet parameters on outlet parameters for liquid desiccant dehumidification. Dehumidifier control is better, as sensible and latent cooling occur separately. In dehumidifier, solution and process air interact with each other in counter flow manner. The independent inlet parameters studied are dry bulb air temperature, air humidity, air flow rate, solution inlet temperature, solution flow rate, solution concentration, where by the outlet dependent parameters are dry bulb air temperature, air humidity and solution concentration. As the ventilation air comes into contact with the desiccant, heat and mass transfer takes place. The humidity level of the air and the concentration of the desiccant get changed accordingly. The principal results are measured and calculated from experimental data. The calculated output prominent parameter is mass of moisture condensate. Experimental investigations are carried out for the dehumidification analysis of inlet process parameters. Once the steady state condition of the dehumidification process is reached, different inlet and outlet parameters of air and solution are recorded. Experiments were performed at five solutions mass flow rates 0.030 kg/s, 0.0456 kg/s, 0.0532 kg/s, 0.0608 kg/s, 0.0761 kg/s with solution concentration of 0.374 and 0.40.

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