Presentation is loading. Please wait.

Presentation is loading. Please wait.

[1] National Institute of Science & Technology Technical Seminar Presentation - 2004 Presented By : Manmatha Kumar Giri Technical Seminar on Refrigeration.

Similar presentations


Presentation on theme: "[1] National Institute of Science & Technology Technical Seminar Presentation - 2004 Presented By : Manmatha Kumar Giri Technical Seminar on Refrigeration."— Presentation transcript:

1 [1] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri Technical Seminar on Refrigeration & Air Conditioning Presented by Manmatha Kumar Giri EE Under the Guidance of Mr. Debashisha Jena

2 [2] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri INTRODUCTION The electrical energy is utilized by converting it into one form or other for getting suitable output from it. The utilization electrical energy for the refrigeration and air conditioning is fast replacing the old methods.

3 [3] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri WHAT IS REFRIGERATION & AIR CONDITIONING ? The process of reducing the temperature of a body from the general level of temperature of surroundings is called refrigeration. Air-conditioning means control of temperature,humidity,purity and movement of air. The working conditions and comfort for human beings is improved by air-conditioning. The temperature is brought down during summer and increased during winter without causing any discount.

4 [4] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri REFRIGERATOR This is the machine by which the temperature of substances is lowered by storing them in this machine.

5 [5] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri PRINCIPLE A refrigerator works on the principle of cooling caused by evaporation. when we dip our finger in petrol or spirit,and the finger is taken out cooling is felt. This is because when petrol or spirit evaporates it draws heat from the finger thus cooling it.

6 [6] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri REFRIGERANT The refrigerant is generally a gas which circulated through different stages to extract the heat from the substances. The various refrigerants used are carbon dioxide(CO2),sulphur dioxide(SO2),ammonia(NH3),Freon(F-12) and methyl chloride etc.

7 [7] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri VAPOUR COMPRESSION CYCLE The main purpose of vapour compression cycle is to remove heat from the refrigerant by putting it into a stage for reuse. The various stages are 1.compression 2.condension 3.expansion 4.evaporation

8 [8] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri APPLICATION The vapour compression refrigeration cycle is employed for the following purposes –Domestic refrigerator, –Water cooler, –Air conditioner, –Ice plant, –cold storage etc.

9 [9] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri DOMESTIC REFRIGERATOR The actual lay out of domestic refrigerator is shown in figure below.

10 [10] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri ELECTRICAL CIRCUIT OF REFRIGERATOR The main parts of the electrical circuit are shown in figure below The various parts are 1. motor compressor unit 2. starting relay 3. thermostat 4. overload protector 5. cabinet light 6. drier assembly.

11 [11] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri MOTOR COMPERESSOR UNIT The motor is a single phase capacitor start motor. The actual capacity of the motor depends upon the size of the refrigerator. But generally the horsepower of motors varies from 7/32 H.P. to 1/8 H.P. Mostly the motor and compressor are in one unit and is known a sealed unit.

12 [12] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri STARTING RELAY The motor is operated by this relay which is also called motor protective relay. It essentially consists of a plunger on which a coil is wound. The figure below shows the arrangement:

13 [13] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri THRMOSTAT A thermostatic switch is used on all the household refrigerators by which the temperature is controlled, and it is called thermostat. The construction of a thermostat used in a refrigerator is shown in figure below:

14 [14] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri OVERLOAD PROTECTOR This is a thermal device which opens the circuit of the motor when overloaded and is called overload protector. The figure below shows the enlarged view of a overload protector.

15 [15] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri CABINET LIGHT This circuit contains a lamp and a switch. The switch is called door switch and so installed that when the door is closed,the bulb remains off. When the door is opened, the bulb remains on.

16 [16] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri DRIER ASSEMBLY This assembly is not employed on all the domestic refrigerators. This is a high resistance wire passing around the drier to remove the moisture from the refrigerator. This is connected across the supply by the thermostat.

17 [17] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri AIR-CONDITIONER The room air conditioner is used to condition the air of a particular space occupied by the human beings i.e. office, room etc. It has automatic operation to control and maintain the humidity of air. There are two parts divided by a partition with a small opening at the top as 1.outdoor part 2.indoor part

18 [18] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri AIR-CONDITIONER The complete operation of an air conditioner can be studied under these sub headings- 1.vapour compression cycle 2.air circulation 3.electrical circuit The figure below shows a room air conditioner

19 [19] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri CONCLUSION The electrical energy is utilised by converting it into one form or the other form for getting suitable output from it. The utilization of electrical energy for the refrigeration and air conditioning is fast replacing the old methods. Refrigeration and Air Conditioning has become a necessity in every sphere of human utility and industrial set-ups.

20 [20] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri Thank You…

21 [21] National Institute of Science & Technology Technical Seminar Presentation Presented By : Manmatha Kumar Giri


Download ppt "[1] National Institute of Science & Technology Technical Seminar Presentation - 2004 Presented By : Manmatha Kumar Giri Technical Seminar on Refrigeration."

Similar presentations


Ads by Google