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Experimental Investigation and Simulation of Modified Evaporative Cooling System

  • Manju Lata
  • Dileep Kumar GuptaEmail author
Conference paper
  • 14 Downloads
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

This paper presents design and fabrication of modified evaporative cooler for producing cooled air without an increase in humidity. An experimental investigation has been carried out in Ahmedabad, India, and subsequently, a mathematical model is developed for the analysis of heat and mass transfer involved during the process. The model is validated with the measured experimental data, and further, the validated model has been used to analyze the performance of the system for Ahmedabad weather conditions throughout the year. The result shows that the minimum and maximum reduced ambient temperature obtained using a modified evaporative cooling (MEC) system is 6.52–34.31 °C and the maximum temperature drop is 17.85 °C. This system is made of kraft paper and aluminum sheet and it can give a better result than the direct and indirect evaporative cooler. The air can be cooled here lower than the wet-bulb temperature without an increase in humidity, and subsequently, it is an economical solution that can provide better comfort.

Keywords

Modified evaporative cooler Counter-flow configuration Effectiveness 

Nomenclature

As

Surface area (m/s)

C

Specific heat capacity at constant pressure (J/kgK)

h

Heat transfer coefficient (W/m2K)

hm

Mass transfer coefficient (m/s)

H

Enthalpy (J/kg)

Hl

Latent heat of vaporization of water at 0 °C (J/kg)

Hwv

Enthalpy of the water vapour at water film temperature (J/kg)

k

Thermal conductivity (W/mK)

\( \dot{m} \)

Mass flow rate (kg/s)

t

Temperature (K)

W

Humidity ratio (kg/kg of dry air)

\( \dot{W}_{\text{evap}} \)

Water evaporation rate (kg/s)

Subscript

a

Average

db

Dry bulb

dp

Dew point

in

Inlet

l

Wall

out

Outlet

p

Primary air

s

Supply air

w

Working air

wb

Wet bulb

w_d

Dry working air

wf

Water film

wv

Water vapour

Greek

Ɛ

Effectiveness

ρ

Density (kg/m3)

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Copyright information

© Springer Nature Singapore Pte Ltd. 2021

Authors and Affiliations

  1. 1.Institute of Infrastructure Technology Research and Management (IITRAM)AhmedabadIndia

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