Project report on "Air cooler cum water chiller"

A Project Report On

Air Cooler cum Water Chiller By Mr. Mayur M. Kamble (1306112) Mr. Shubham R. Shinde (130114) Mr. Amit A. Nalawade (1306117) Mr. Akshay P. Kadam (1306118) Mr. Pranit N. Khot (1306128)

T.Y.B.Tech. Mechanical Engineering Under Guidance of

Prof. P.S. Jadhav

KASEGAON EDUCATION SOCIETY’S RAJARAMBAPU INSTITUTE OF TECHNOLOGY, RAJARAMNAGAR (AN AUTONOMOUS INSTITUTE, AFFILIATED TO SHIVAJI UNIVERSITY, KOLHAPUR) DEPARTMENT OF MECHANICAL ENGINEERING 2015-2016 1

ACKOWLEDGEMENT First and foremost we take it as a highly esteemed privilege to express my utmost and deepest gratitude to our guide Prof.P.S.Jadhav, for his great support, enthusiasm, encouragement and precious guidance.We are very thankful to Prof. Dr. S.D.Patilfor directing us. I am heartily thankful to Dr. Mrs. S.S.Kulkarni, Director of RIT, Rajaramnagar for her kind support and guidance. I would like to express my sincere gratitude to Dr. S.S.Gawade, Head of Department for his unstinted support, advice and cooperation.

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ABSTRACT “AIR COOLER CUM WATER CHILLER” as the name suggest that it is the modification of the conventional cooler. It is the Air Conditioner cum refrigerator for people who cannot afford costly equipment like air conditioner, refrigerator and other such appliances. It cools the air more than the conventional Air Cooler. The Air cooler cum water chiller is developed for providing better cooling effect than conventional air cooler. It also provides cold water for drinking purpose comparatively at low cost than Refrigerator. It also decreased moisture content of the air coming through desert cooler upto some extent.

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SR NO

CONTENT

PAGE NO

1.

Introduction

5

2.

Problem statement

6

3.

Working principle of air cooler

7

4.

Methodology

8

5.

Observation

9

6.

Model description

10

7.

Result table

12

8.

Calculation

16

9.

Advantages

20

10.

limitation

21

11.

Conclusion

22

12.

References

23

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1.INTRODUCTION In India during summer season the average temperature is around 45 0 C. To maintain comfortable conditions in summer season various appliances like Air Conditioners, coolers and fans are used. The cost of such appliances is quite high which is beyond reach of common man. Also during summer season everyone needs cool air and cold water for drinking purpose. So to be comfortable in this season we need cold water and cool air. To fulfill these requirements we need to purchase two different appliances one for cooling air and other appliance for cooling water. Also space required for installation of this appliances is more. Innovation and Modification is the nature of engineering. Hence we have introduced “AIR COOLER CUM WATER CHILLER”. Main purpose of our project is to provide both of these facilities that is cool air and cold water in single unit and to provide this unit at affordable cost for common man. Due to the single unit the space required for installation is also less. This unit can be used in homes, offices, banks, auditorium halls, etc.

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2.PROBLEM STATEMENT: In big cities like Pune, Aurangabad, Nagpur and other such cities space availability is big problem. In summer season there is need of cool air and cold water. Hence we require two separate units that is air cooler and water chiller or refrigerator. Hence space requirement is more and also the cost is higher. Hence we have to develop a unit which fulfills both the purpose and possess less space for Installation with affordable rate. Also there is scope for developing this unit for industrial applications.

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3.WORKING PRINCIPLE OF AIR COOLER: 

Evaporative air cooling is the natural way of cooling, similar to a breeze flowing across a



lake. This breeze lowers the temperature and has a relaxing cooling effect on people. An evaporative air cooler cools the air by means of the evaporation of water. When water evaporates into the air, the result is a mixture of air and water molecules. This chemical change requires heat, thus energy or latent heat is taken from the air molecules - dropping



the actual temperature of the air. The recommended maximum humidity level is 60% or less, to allow a noticeable temperature decrease and helps people to feel more comfortable. The temperature decrease will be larger in dryer climates because the lower the humidity, the more



evaporation occurs. When used for cooling, the evaporative air cooler should not be used in enclosed spaces. It must be kept level and there must be water in the water tank. The room should have



doors and windows opened to allow free air flow. An evaporative air cooler works best when placed near an open window. Fresh air is



drawn into the cooler, circulates in the room and exits via the door. The maximum cooling effect is felt when a person is in the flow of air coming out of the



evaporative air cooler. Evaporative air coolers can also be used to humidify dry air during the cool weather months. To be used for humidification, the windows and doors should be closed. This allows the humidified air to accumulate.

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4.METHODOLOGY In order to design the model which will cool both air and water, heat exchangers theory should be understood. In order to modify existing desert cooler heat exchanger analysis should be done. More surface area will give good results of cooling but size of whole unit will increase. So to make it compact certain arrangements are done which are:  

Arranging high conductivity concentric vessels. As this arrangement is outside the air cooler, it will require more floor space. Dipping Coil in the lower tank of cooler. The coil of metal having high thermal conductivity is dipped in lower tank of the cooler, so there will not be any extra floor space required.

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5.TESTS CONDUCTED: Test No.1 In order to know the temperature conditions at lower tank of cooler temperature change with respect to time should be recorded. The following table shows variation of temperature with respect to time. All these readings are obtained in closed room (extreme condition) Sr. No. 1 2

Temperature (0C)

Condition Room Temperature Initial Water Temperature

31 30 Table No.1

Sr. No. 1 2 3 4 5 6

Time (minutes)

Water Temperature(0C)

10 20 30 40 50 60

22 21 20 20 20 19

Room Temperature (0C) 28 28 27 26 26 26

Table No.2

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Graph No.1 Graph No.2

Interpretation of graphs: With respect to time there is drop in temperature of water and air, due to cooling action of cooler.

Test No: 2

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This test is carried to know whether both air cooling and water cooling is possible or not. For this with specific interval of time 3 liter water is taken out assuming 100% heat is transferred. And 3 liter of normal water is again added in the lower tank.Then both the temperatures were recorded.

Sr. No.

Condition

1

Temperature (0C) 28

3 Litre Water Out

2

27 27

6 Litre Water Out

27

From the table, the temperature of coolant water is remaining constant though water is taken out of and normal water is added. It states that both space cooling and water cooling can be achieved in efficient manner.

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6. Model Description Construction It consists of, 1. 2. 3. 4.

Drinking Water Storage tank. Copper Coil Battery Connecting pipes.

1. Drinking Water Storage tank : It is two liter LDPE tank with pump. (It is used in the automobiles for storing wiping water.)

2. Copper Coil:

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For effective cooling,the copper coil of 200 mm length and 1 cm dia. is used (this coil is used as condenser coil in refrigerator). This coil is dipped in the lower tank of cooler. The end are connected with connecting pipes, one as inlet and other as outlet.

Thermal analysis of coil:

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The temperature distribution along thickness of coil can be found out by using Ansys. The Boundary conditions are 1. Cooling water temp : 210 C 2. Drinking Water temp: 300 C

7.Result Table:

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After completing model the final test is conducted on model to check temperature drops.

Sr. No.

Condition

Temperature (0C)

1 2

Room Temperature Initial Water Temperature

37 36

Temp 0C Cooling water Room temp near cooler Room temp at 10feet Drinking water

Initial Temp

10 Min

20 Min

30 Min

35 Min

40Min

45 Min

50Min

36

30

29

28

28

27

27

27

37

35

34

33

32

32

30

30

37

37

35

35

34

33

32

32

36

36

36

36

32

30

29

29

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From above table it can be seen that the drinking water temperature is reduced by 70 C.

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Air Cooler cum Water Chiller: This Arrangement can be done by modifying existing cooler.

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8.ADVANTAGES: 1) Space required for installation is less.

2) Cost of unit is less and hence economical. 3) Less maintenance requirements. 4) Effective cooling can be achieved.

9.LIMITATIONS:

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Air cooler works on principle of relative humidity but in cities like Mumbai humidity is high so air cooler don’t give expected results of cooling.

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11.CONCLUSION The cost of a normal air conditioner is approximately Rs. 28000/- and the cost of a refrigerator is about Rs.7000/-; which quiet expensive than AIR COOLER CUM WATER COOLER. AIR COOLER CUM WATER COOLER provides us with both the facilities at an affordable cost of Rs.4500/- only. Thus AIR COOLER CUM WATER COOLER cools the air more than the conventional Desert cooler, it also provide cold-pure waterfor drinking purpose comparatively at low cost than Refrigerator. The modified desert cooler is developed for providing better cooling effect than conventional desert cooler. It is also used for cooling and purifying the drinking water.

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12.REFERENCES  Wikihow and Wikipedia.  Heat and mass transfer by R.K. RAJPUT.  International Journal of Engineering and Technical Research (IJETR) ISSN: 2321-0869, Volume-2, Issue-4, April 2014.

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