MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE DIPLOMA IN MECHANICAL ENGINEERING H.P.T.S. BOARD DHARAMSHALA
Submitted To: Er. Ramashankar Singh Project Incharge
ME DEPTT GHPC SOLAN
Submitted By: Nikhil Kumar Mukesh Kumar Avtar Singh Himmat Singh Naveen Kant
[Students of ME 6th Sem]
DEPARTMENT OF MECHANICAL ENGINEERING GREEN HILLS POLYTECHNIC COLLEGE KUMARHATTI, SOLAN (H.P) PIN NO:173229 2010
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
CONTENTS
1. 2. 3. 4. 5. 6. 7.
ACKNOWLEDGMENT CERTIFICATE INTRODUCTION PRINCIPAL OF OPERATION CONSTRUCTION WORKING BIBLIOGRAPHY
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
ACKNOWLEDGMENT
We consider it a pleasant duty to give our heartiest respect, gratitude and indebtedness to ER. RAMASHANKAR SINGH (project incharge) ER. VIVEK GUPTA (H.O.D. MECHANICAL DEPARTMENT) of the GREEN HILLS POLYTECHNIC COLLEGE their keen interest, sincere deeds and valuable guidance, continuous calm endurance and inspiration. Last but not least we would like to thank upon all concerned persons of this project who gave their best directly or indirectly. We would also like to thank workshop staff who provided us necessary facilities for completing the project. NIKHIL KUMAR MUKESH KUMAR AVTAR SINGH HIMMAT SINGH NAVEEN KANT
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
CERTIFICATE
This is certify that NIKHIL, MUKESH, AVTAR, HIMMAT, NAVEEN are the student of ME DEPARTMENT GHPC SOLAN 6th semester. These students have undergone major project as per curriculum under my guidance. The project aim is to modify desert cooler.
I wish them all success and good luck for their future............................
ER. VIVEK GUPTA H.O.D., MECH. ENGG. DEPARTMENT GHPC, SOLAN
ER. RAMASHANKAR SINGH PROJECT INCHARGE ME DEPTT. GHPC SOLAN
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
OBJECTIVE
1. ENERGY EFFICIENT The water cum air cooler consists of heat exchanger with fins, one drought fan of 50 watt power, submersible fan of 1.5m head instead of compressor. As compressor consume more power than the heat exchanger with fins, by using heat exchanger with is to increase the rate of heat transfer.
2.
COST EFFICIENT We made the market search and find that if one person
wants to buy the water cooler as well as desert cooler he has to pay at least ten thousand rupees. As in this project we are providing both water and desert cooler in one unit and this is easy to transform from one place to other. When we have completed the project we find that money spend for buying the equipments for this project is forty five hundred rupees, from above we can see that water and air cooler reduce the cost by more than 50%. This project helps in saving the energy as well as cost. This idea is greatly helpful to the middle class family and poorer family.
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
INTRODUCTION
As we know that the war of yesterday was for land, today is for energy and tomorrow is for water. A country of 1.2 billion needs equipment which is energy efficient. As there is large scarcity of energy in our country so we as an engineer has the prime duty to make energy efficient equipment. While thinking in this direction we came to know that water and air cooler are the basic equipment which are present in almost every household, so we have tried to consist these two in a single unit, by using this as a single unit we are not only reducing the space consumption but also reducing the cost factor. When we are using water and air cooler as separate unit in home, they consume 3 times mor electricity as compare to the equipment which contain them in single unit. This helps in saving cost as well as energy. Now a days, there is requirement of such domestic equipments which are compact, have less power consumption, less maintenance and multipurpose objectives. The modified form of cooler is completely in proportion of above mention requirement.
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
PRINCIPLE OF OPERATION
A water-cum air cooler works on principle of heat loss during evaporation process, resulting in cooled air. Evaporation process occurs when water and air comes into contact with each other. Best example of this process is in summer season we feel cool when we stand near to fan this is because the sweat vaporise. The process is known as latent heat of vaporization. Latent heat of vaporization is the amount of heat required to convert unit mass of liquid into vapour. Water and air are the two fluids between which evaporation process takes place, actually one end of condenser is attached to the fresh water tank which has little higher temperature than the water sprayed over the condenser, when fresh water passes over the hollow pipes of heat exchanger with fins the heat is transfer from the fresh water spread by the sprayer and mixture of air and vapour is delivered by the duct.
HOW EVAPORATION TAKES PLACE.................................? Evaporative air cooling is a naturally occurring phenomenon. When air and water come into contact the water evaporates into the surrounding air, reducing its temperature. This is why on a hot day it is cooler near a lake, waterfall of fountain.
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
CONSTRUCTION
We want to produce cooling in a room of 10' 12' we came to know that a desert cooler of capacity temperature. As we know in Indian household on an average four members are present and each consume 1.5 litre of water so in a day they will consume 6 litre of water. As whole of 6 litre is not consumed in one time but in intervals, so we want to have capacity of tank in which cooled water stored is up to 1.5 litre for that purpose we use heat exchanger which has coils with fins and which can store water up to 1.5 litre. IT CONSISTS OF FOLLOWING PARTS 1. TANK It is made up of mild steel of 1.5mm thickness. It is used for the purpose of storing water which has to be sprayed over the heat exchanger by lifting it with the help of submersible pump, this water is fed to sprinkler. The sprinkler sprays the water on heat exchanger and cycle goes on repeating. of can be able to produce cooling by decreasing the
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
2.
SUBMERSIBLE PUMP Submersible pumps is attached to he tank, it has 1.5m head. It is used to
lift the water from the tank and fed to the sprinkler. It has capacity of 3. HEAT EXCHANGER Heat exchanger is a device which transfers the energy from hot fluid to cold fluid, with maximum rate and minimum investment and running costs. In heat exchanger the temperature of each fluid changes as it passes through exchanger. In the project we are using heat exchanger with fins, the property of fins is to increase the heat transfer rate, by the use of fins, surface area is increased due to which heat flow rate increases. Increase in surface area decreases the surface convention resistance, whereas the conduction resistence increases. The decrease in convention resistence is much greater than the increase in conduction resistence in order to increase the rate of heat transfer from the surface. Fins used are rectangular in shape. EFFECTIVENESS OF FIN It is the ratio of heat transfer rate to the heat transfer rate that would exist without of fin. From the experiment we find that heat transfer rate with fins are 26% more than the ordinary heat exchanger.
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
4.
KHAS-KHAS- GRASS
The air which drought fan sucks from atmosphere is cooled by this grass which has property to absorb water. It helps to increase the efficiency of unit by providing the inlet air at the temperature already lower than the ambient temperature. This air will further cooled inside the unit. This Khas-Khas grass is attached to the four sides of the cooler.
5.
DROUGHT FAN
This fan is attached to the topmost part of the cooler. Fan is of 12" and it has rpm of 1440. This fan helps in evaporation process and duct is placed over the fan which helps to provide mixture of air and water vapour so the person around the range of cooler feels cools air.
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
WORKING
HEAT EXCHANGER with fins on the upper surface has inlet for fresh water and outlet for cool water. The inlet water has temperature slightly more than that of the water spread over the heat exchanger. The submersible pump lifts the water from the tank and feed it to sprinkler, sprinkler sprays the droplets of water over the heat exchanger, and thus the transfer of heat occurs. As we know that heat is always transferred from high to low temperature and the water spread over the heat exchanger is at low temperature, thus the inlet water while passing through the heat exchanger gives heat to the water outside the heat exchanger coil and we get the cold water from outlet of heat-exchanger.
The water over the coils of heat exchanger when comes in contact with air, the evaporation of water takes place thus the drought fan sucks the mixture of water vapours and air and it provide this mixture to the surrounding with help of duct. Duct is made curved at the bending section, this is done to avoid back pressure and to deliver the maximum cold air.
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
Adiabatic efficiency of water cum air cooler Ambient temp.:Dry bulb temp. (DBT) = 25c Wet bulb temp. (WBT) = 23c Conditioned air:Dry bulb temp. (DBT) = 20c Wet bulb temp. (WBT) = 16c
DBT (AMB) - DB conditioned air 100 WBT (AMB) - WBT conditioned air
25c - 20c 100 23c -16c 5 100 = 0.71 100 7 71%
= =
MAJOR PROJECT REPORT ON WATER CUM AIR COOLER
BIBLIOGRAPHY
1. 2. 3.
HEAT AND MASS TRANSFER BY RAJPUT, R.K. ENGINEERING THERMODYNAMICS BY NAG, P.K. FROM WEBSITE www.wilipedia.com www.mechprojects.com www.innovation.com
