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Heat and Mass Transfer

, Volume 52, Issue 12, pp 2707–2722 | Cite as

Experimental and numerical investigation on the performance of an internally cooled dehumidifier

  • Oguz Emrah TurgutEmail author
  • Mustafa Turhan Çoban
Original

Abstract

Liquid desiccant based dehumidifiers are important components of the air conditioning applications. Internally cooled dehumidifiers with liquid desiccants are deemed to be superior to the adiabatic types, thanks to the cooling medium which takes away the latent heat of vaporization occured when moist air contacts with liquid desiccant. However, its utilization in industrial applications is restricted due to the inherent corrosive characteristics of the liquid desiccants. In this study, an experimental chamber is built for epoxy coated plate fin type dehumidifier which is used in order to diminish the corrosive effect of the lithium chloride aqueous solution. Dehumidification effectiveness and moisture removal rate, two parameter indices, are adopted to measure the performance of the air conditioning system. The effect of inlet operating parameters on moisture removal rates is extensively analyzed. Two dimensional numerical model adapted from the conservation principles is utilized for obtainment of output parameters. Experimental results are compared with the numerical model and comparisons show that numerical outputs agrees with the experimental results. And also, dehumidification performance of lithium chloride and lithium bromide aqueous solutions are evaluated and compared against each other.

Keywords

Absolute Humidity Water Storage Tank Humidity Ratio LiBr Solution Cooling Water Flow Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

A

Heat and mass transfer area (m2)

Cp

Specific heat capacity (kj/kg K)

H

Height of the dehumidifier (m)

h

Enthalpy (kj/kg)

hfg

Latent heat of vaporization (kj/kg)

L

Length of the dehumidifier (m)

Le

Lewis number (dimensionless)

\( {\dot{\text{m}}}_{\text{wr}} \)

Moisture removal rate (g/s)

\( {\dot{\text{m}}} \)

Mass flow rate (kg/s)

NTUh

Heat transfer unit number between air and desiccant (dimensionless)

NTUm

Mass transfer unit number between air and desiccant (dimensionless)

P

Pressure (kPa)

T

Temperature (°C)

X

Concentration of the liquid desiccant (%)

Greek symbols

α

Heat transfer coefficient between air and desiccant (kW/m2K)

αw

Heat transfer coefficient between cooling water and desiccant (kW/m2K)

αm

Mass transfer coefficient between air and desiccant (kg/m2s)

η

Dehumidification efficiency (dimensionless)

ω

Absolute humidity (kg vapor/kg dry air)

Subscript

a

Air

da

Dry air

e

Air in equilibrium with liquid desiccant

in

Inlet

out

Outlet

s

Liquid desiccant

v

Vapor

w

Cooling water

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentEge UniversityBornovaTurkey

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