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EVAPORATIVE COOLING

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INSIGHTS

INTRODUCTION

HISTORY

METHOD

ADV/ DISADVANTAGES

APPLICATIONS

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INTRODUCTION

Evaporative cooling has made summers morebearable for thousands of years

With 21st century technology provides effective,

economical, environmentally friendly, andhealthy cooling.

Evaporative cooling comes in five flavors: direct,indirect, indirect/direct, indirect/indirect, andindirect/DX.

Evaporative cooling works well in the PacificNorthwest, alone or as a supplement to a chilleror DX system.

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WHAT IS EVAPORATIVE COOLING?

Evaporative cooling is a physical phenomenon inwhich evaporation of a liquid, typically intosurrounding air, cools an object or a liquid in

contact with it. Evaporative cooling is responsible for the chill

you feel when a breeze strikes your skin, the airevaporates the water on your skin, with yourbody heat providing the energy

Method of cooling utilizes high latent heat of vaporization of water to obtain cooling withminimum of water.

It is also called as vapour or steam cooling.

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TYPES OF E.C.

DIRECT

INDIRECT

INDIRECT/DIRECT INDIRECT/INDIRECT

INDIRECT/DX

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Direct evaporative cooling

Outside air is blown through a water-saturated medium (usually cellulose) andcooled by evaporation.

The cooled air is circulated by a blower.

Direct evaporative cooling adds moisture tothe air stream until the air stream is close tosaturation

Indirect evaporative cooling Secondary (scavenger) air stream is cooled

by water.

The cooled secondary air stream goesthrough a heat exchanger, where it coolsthe primary air stream. The cooled primaryair stream is circulated by a blower.

Indirect evaporative cooling does not addmoisture to the primary air stream.

During the heating season, an indirectsystems heat exchanger can preheatoutside air if exhaust air is used as thesecondary air stream.

Direct & indirect evaporative cooling

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Applications

Evaporative cooler

Misting fan :

A fan blows a fine mist of water into the air. If the air is not too humid,the water evaporates, absorbing heat from the air, allowing the mistingfan to work as an air conditioner. A misting fan may be used outdoors,especially in a dry climate.

Radiators in automobiles

laundries

dry cleaners

Greenhouses.

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It is economical, effective, environmentally friendly, and healthy. Increases compressor life.

Increases heat exchanger life.

Works in all areas of the country, hot & dry areas.

Becomes more effective as the temperature increases.

Easy to maintain, operate & less expensive.

High humidity in air accelerates condensation & corrosion, particularly inthe presence of dust.

High dew point conditions decrease cooling capacity.

Requires continuous water supply.

Advantages

Disadvantages

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Radiator

Radiators are used for cooling internal

combustion engines, chiefly inautomobiles but also in piston-enginedaircraft, railway locomotives,motorcycles.

In automobiles with a liquid-cooled

internal combustion engine a radiatoris connected to channels runningthrough the engine and cylinder head,through which a liquid is pumped.

Liquid may be water, more commonly

a mixture of water and antifreeze . The radiator transfers the heat from

the fluid inside to the air outside,thereby cooling the engine.

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DINESH NAVALE PE03-27

SHWETA NAGARALE PE03-26

THANK YOU