DESIGN AND FABRICATION OF SOLAR COOLING SYSTEM GUIDE BY A.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 1

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. 2

3 Introduction REFRIGERATION Refrigeration is a process by which the temperature of a given space or substance is lowered below than the atmosphere. AIR CONDITION Air 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 4

Comfort cooling condition 1.Climate and seasonal differences 2.Clothing 3.Age and sex 4.Duration of stay 5

Solar collector It can increases the pressure and temperature of the vapour refrigerant. It can acts generator cum absorber. 6

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Condenser 8 TYPE : Air cooled condenser A Condenser is a equipment built for efficient heat transfer from one medium to anotherheat transfer

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. 9

10 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.

11 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 12

WORKING PROCEDURE 13

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Experimental Results 17 Collector Temp. (c) Suction Pressure psi Dis. Pressure psi Conditioned Air temp c Time pm Atm. Temp c Date : PLACE : THERMAL ENGINEERING LAB

Temp °CPressure kPa TESTING RESULTS OF R134a - TetraFlouroEthane Temperature Table (20°C - 56°C)

COMPONENTTYPE Solar collectorFlat plate Air conditionerIndoor unit RefrigerantR134a CondenserAir cooled EvaporatorAir cooled GaugesPressure & vacuum gauges Expansion ValveCapillary tube

Specification COMPONENTSSPECIFICATIONS Aluminium box3X2 ft Copper tube20 ft Blower motor240V, 2A, 50Hz Air Conditioner1 ton Glass2X3 ft, 4mm(thickness) Hoses (Suction & Discharge) 2500 psi (max.) Refrigerant500 Gms

Advantages Environmental based : Pollution free & eco friendly Reduce the usage of conventional energy and as good alternatives. CFC emission is reduced. 21

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. 22

Future Scopes 23 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. 24

Conclusion The system works satisfactorily and reduces the ambient temperature considerably by 6 to 8 o c. 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. 25

THANK U 26

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Photocopy 29