DESIGN AND FABRICATION OF SOLAR COOLING SYSTEM

GUIDE BYA.BALAJI M.E.,Assistant Professor (Sr. Grade),Department of Mechanical Eng.,

TEAM MEMBERS

S.Gautham [07ME13],G.Mohankumar [07ME27],S.Sakthivel [08MEL508],M.Vishnujayanthan[08MEL509].

BATCH NO : 9

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Objective

The main aim of the project is a try to generate a cooling

effect by using solar energy.

To design and construct a compressor free cooling system.

To use environmental friendly refrigerant for reduce the

pollution (R134a).

To reduce the usage of electricity for cooling purpose.

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Introduction

• REFRIGERATION

Refrigeration is a process by which the temperature of a given space or substance is lowered below than the atmosphere.

• AIR CONDITIONAir condition is a process Of controlling the temperature, quantity, humidity& quality of a air for the required space.

Conventional cooling system

1)Vapour Compression cooling System

2)Vapour Absorption cooling System

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Comfort cooling condition

1. Climate and seasonal differences

2. Clothing

3. Age and sex

4. Duration of stay

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Solar collector

• It can increases the pressure and temperature of the vapour refrigerant.

• It can acts generator cum absorber.

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Condenser

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TYPE : Air cooled condenser

A Condenser is a equipment built for

efficient heat transfer from one

medium to another

Evaporator

Any of many devices in which liquid is

changed to the vapor state by the addition of

heat

In refrigeration system element where

evaporation proceeds at low pressure and

consequent low temperature.

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Non Return Valve

Function of Check Valve is to prevent the

reverse flow of fluid in case of failure or

sudden shut-down of Piping System.

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R134a Tetrafluoroethane

• Refrigerant is a heat carrying medium which absorb the heat from low temperature space and reject the heat to high temperature space.

Refrigerant

Properties of R134a

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WORKING PROCEDURE

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Experimental Results

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CollectorTemp. (c)

SuctionPressurepsi

Dis.Pressure psi

ConditionedAir temp c

Time

pm

Atm.Temp c

68 118 118 35 12.10 35

70 120 128 34 12.15 35

76 127 138 34 12.20 35

84 131 162 33 12.40 36

92 128 166 31 1.05 36

Date : 24.03.2011 PLACE : THERMAL ENGINEERING LAB

Temp °C Pressure kPa

20 571.7

24 645.8

26 685.4

28 726.9

30 770.2

32 815.4

34 862.6

36 911.9

38 963.2

40 1016.6

42 1072.2

44 1130.1

48 1252.9

52 1385.4

56 1528.2

TESTING RESULTS OFR134a - TetraFlouroEthane Temperature Table (20°C - 56°C)

COMPONENT TYPE

Solar collector Flat plate

Air conditioner Indoor unit

Refrigerant R134a

Condenser Air cooled

Evaporator Air cooled

Gauges Pressure & vacuum gauges

Expansion Valve Capillary tube

Specification

COMPONENTS SPECIFICATIONS

Aluminium box 3X2 ft

Copper tube 20 ft

Blower motor 240V, 2A, 50Hz

Air Conditioner 1 ton

Glass 2X3 ft, 4mm(thickness)

Hoses (Suction & Discharge)

2500 psi (max.)

Refrigerant 500 Gms

Advantages

Environmental based : Pollution free & eco friendly

Reduce the usage of conventional energy

and as good alternatives.

CFC emission is reduced.

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Contd..

Technical based :

Refrigeration with no compressor.

R-134a is used as refrigerant which has low

emission of CFC.

It does not depend upon the electrical

energy.

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Future Scopes

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The electric energy to the condenser fan and blower to be supplied by solar photovoltaic cell.

During night time the heat can be supplied by using the heating coil.

By increasing the area of the solar collector performance can be improved.

(Contd.)

• By changing the refrigerant human comfort can be increased.

• By replacing the normal valve to solenoid valve, the system can be automated.

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Conclusion The system works satisfactorily and reduces the ambient

temperature considerably by 6 to 8oc. The results obtained from the system are tabulated.

In future we hope that our whole world is purely depend on renewable energy so our project is very much useful for pollution free environment.

By taking the further developments it may possible to produce cost free cooling.

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THANK U

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Photocopy

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