Abstract
The aim of this research was to study and design a solid desiccant dehumidification system suitable for tropical climate to reduce the latent load of air-conditioning system and improve the thermal comfort. Different dehumidifiers such as desiccant column and desiccant wheel were investigated. The ANSYS and TRASYS software were used to predict the results of dehumidifiers and the desiccant cooling systems, respectively. The desiccant bed contained approximately 15 kg of silica-gel, with 3 mm average diameter. Results indicated that the pressure drop and the adsorption rate of desiccant column are usually higher than those of the desiccant wheel. The feasible and practical adsorption rate of desiccant wheel was 0.102 kgw/h at air flow rate 1.0 kg/min, regenerated air temperature of 55?C and at a wheel speed of 2.5 rpm. The humidity ratio of conditioning space and cooling load of split-type air conditioner was decreased to 0.002 kgw/kgda (14%) and 0.71 kWth (19.26%), respectively. Consequently, the thermal comfort was improved from 0.5 PMV (10.12% PPD) to 0.3 PMV (7.04% PPD).
Highlights
A principal purpose of Heating Ventilation and Air Conditioning (HVAC) is to provide thermal comfort conditions for humans
The thermal comfort was improved from 0.5 PMV (10.12% PPD) to 0.3 PMV (7.04% PPD)
Both mechanical refrigeration systems and desiccant material can remove the moisture from the supply air, whereas desiccant dehumidification is advantageous in dealing with latent load and improving indoor air quality because of adsorbing moisture directly
Summary
A principal purpose of Heating Ventilation and Air Conditioning (HVAC) is to provide thermal comfort conditions for humans. In areas of high humidity, moisture presents a major problem for the human comfort and the air-conditioning systems, and unitary dehumidifiers should be used. Both mechanical refrigeration systems and desiccant material can remove the moisture from the supply air, whereas desiccant dehumidification is advantageous in dealing with latent load and improving indoor air quality because of adsorbing moisture directly. The solid desiccant dehumidifiers usually employ stationary beds or rotary wheel beds for packing the desiccant media, namely desiccant column and desiccant wheel, respectively.
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