Performance Enhancement of Rotary Desiccant Wheel using Novel Homogenous Composite Desiccant Designs

Abstract

Rotary solid desiccant wheels are used as sensible and latent heat recovery wheels in the Desiccant-HVAC systems. The two major types of these wheels include enthalpy (total energy recovery) wheels which remove sensible heat and latent heat from process air and transfer them to regeneration air, and dehumidification wheels which transfer a significant amount of moisture (latent heat) at the same time minimizes heat transfer. In this work a set of novel design of hybrid rotary desiccant wheel constructed using a composite homogeneous mixture of solid desiccants (multiple types of silica gel and molecular sieves) are proposed. The transport phenomena taking place in the proposed set of novel design of hybrid rotary desiccant wheel are simulated numerically using an in house finite volume method based CFD code. The performances of these wheels are compared with conventional type of wheels made of molecular sieves and silica gel, respectively. The results show that the performance of these hybrid wheels are enhanced by up to 40 % by using these novel composite wheel designs.

Parametric Analysis of a Universal Isotherm Model to Tailor Characteristics of Solid Desiccants for Dehumidification

“…Recently, many efforts have been made on the design of desiccant dehumidification systems like rotary wheels and coated heat exchangers (Zhou and Reece, 2019;Venegas et al, 2021). However, the characteristics of the desiccant material are critical (Muthu et al, 2021) to enhance the performance as different characteristics of the desiccant are needed for other tropical locations depending upon the humidity level for the optimum performance of the desiccant.…”

Experimental Investigation on Heat Transfer Performance of Rotatory Desiccant Dehumidifier

“…Fong et al (2020) [3] proposed activity of the DW at a advanced speed for energy recuperation just deprived of heat recovery offered 9.5% progress in the sunlight based division and decrease of 11.5% in the all-out essential energy utilization, when contrasted with the previous one when the occasional impact was additionally considered. Muthu et al (2021) [4] used novel composite wheel designs improved the act of these amalgam wheels by up to 40 %. Similarly, planned set of different proposal of revolving desiccant wheel hybrid the transport phenomena taking place and method based CFD code numerically rsults were simulated.…”