טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentBen-Ari Adi
SubjectInvestigation of Air Dehumidification Systems Based on
Solid Adsorbents
DepartmentDepartment of Mechanical Engineering
Supervisor Professor Emeritus Gershon Grossman


Abstract

Some applications of air conditioning systems require handling a large amount of fresh air.  In vapor compression systems, the air absolute humidity is reduced by lowering the air temperature below the dew point.  The latent heat handling consumes relatively high energy from the vapor compression system.  In order to solve this problem, desiccant systems are used.  The main task of the desiccant system is to handle the air latent heat, before being supplied to the conditioned space. The heart of the desiccant system is the desiccant wheel.  The desiccant particles are attached to the inert bed such that process air can pass among the desiccant particles.  In order to maintain steady state, the desiccant wheel rotates continuously and two air streams, separated by a fixed partition, pass through it. One of the streams is the process air being dehumidified and the other stream is the regeneration air.  In this work a three-stage investigation was conducted.  First, a fixed desiccant bed was examined.  At this stage, the influence of several factors on the conditions of the air at the outlet of the desiccant wheel was investigated.  In the second stage of investigation, a rotating wheel was considered and the influence of the same factors on the COP was examined.  In the third stage, a complete dehumidification system was examined.  At this stage, the influence of the regeneration heat, the desiccant ratio, the heat exchanger efficiency and the amount of water added to the regeneration channel evaporative cooler on the desiccant system COP was examined.