Natural Water Cooled System

Natural Water Cooled System

Mayank Uniyal (B.Sc, B.Tech, M.Tech-Thermal Engineering) Arun Gangwar, Assistant Professor

Hemant Negi, Bharat Pratap, Himanshu Bisht, Kanika, Karuna, Deepak Barthwal Students (B.Tech -Mechanical)

• Aluminum box

• Insulating box

• Cooling tower

• Water pump

• Fins

• Base plate/tank

In this the cooled water from the cooling tower is allowed to fall on the roof of the aluminum box. After that it moves down the box by being in contact with the fins fitted on the walls, there by extracting heat from the air inside the aluminum box and hence cooling the room. This water is collected at the base tank and then transferred to the cooling tower through a water pump . In the cooling tower the water is cooled by natural convection. And then again the water is transferred on the roof of the aluminum box. Similarly, the cycle goes on and hence cooling is obtained inside the room. A fan circulates the air inside the room for proper cooling.

The pump is fitted over the base plate with output fitted to the cooling tower and inlet from the base plate. The cooling tower is also fixed at the corner of the base plate. The outlet of the cooling tower is connected to the top of the insulating plate.

The various parts of the system are:-

• Stainless steel plate:- A stainless steel plate is used as the base of the project the

  dimensions of the sheet are (51 X 47 X 6) CM . The thickness of the sheet is 18 gauges.

more heat transfer. It also increases the time of contact of the water with the aluminium box.

• atmosphere to affect the inside atmosphere.

• Electrical circuit = The system runs through an electrical circuit which is connected to an ac source 220v and then connected to a transformer (220 to 12 v) . which then further supplies the power to the pump and fan. .

1. During 1900 the definition of air conditioning considered as the control of both temperature and humidity. It was later on developed to add water particles in the stream of hot air to develop cool air. (2) Later on the concept of centrifugal compression was used in the refrigeration system . After that there were a no of developments in the design and working of compressors. It was patented in 1921 .(3) In 1928 the first residential 'Weather maker', an air conditioner for private home use. The Great Depression and then WW2 slowed the non-industrial use of air conditioning. After the war, consumer sales started to grow again. The rest is history, cool and comfortable history.(4) In 1931 invent an individual room air conditioner that sits on a window ledgea design that's been ubiquitous in apartment buildings ever since. The units are available for purchase a year later and are only enjoyed by the people least likely to work up a sweatthe wealthy. (5) In 1935 an interesting centrifugal chiller that used water as the refrigerant. This eliminated the need for a chilled water heat exchanger. In 1937 to produce the first practical hermetic centrifugal suitable for wide distribution. The chiller had two barrels, a condenser above and a cooler below. Located in the end of the cooler was a motor with a two- stage centrifugal compressor.

   For the working of the project the base plate is filled completely with water . the pump and the fan are then switched on. the pump then throws the water over the cooling tower. The water is then cooled in the cooling tower naturally . the cooled water is then collected from the base of the cooling tower and is transferred through the pipe at the top of the insulating plate . this cooled water is then allowed to fall over the terrace of the aluminium plate from where this water is distributed to all the four sides of the aluminium box where this water moving along the fins extract the heat from aluminim box and then moves to the base plate . where this water is again pumped to the cooling tower for cooling and the cycle goes on . the function of the fan is to make the flow of air through the aluminium box regularly.

   Temperature inside the room before the cooling = 32degree C

   Temperature inside the room after the water cooled system is on = T(W.C)

   s.no	Time (min)	T (W.C)
   1.	15	29
   2.	30	26.8
   3.	45	25
   4.	60	24
   5.	75	23.5
   6.	90	23.1

   s.no	Time (min)	T (W.C)
   1.	15	29
   2.	30	26.8
   3.	45	25
   4.	60	24
   5.	75	23.5
   6.	90	23.1

   Temperature inside the room after the air conditioner is on is on= T(A.C)

   s.no	Time (min)	T (A.C)
   1.	15	29
   2.	30	27
   3.	75	26
   4.	90	25
   5.	120	24
   6.	150	23

2. DATA REPRESENATION:-

   • Cost of aluminium plate (20 gauge)

     = 80rs/ft^2

   • Cost of stainless steel plate (18 gauge) = 160rs/ft^2

   • Cost of galvenized steel plate(22 gauge) = 60rs/ft^2

   • Cost of fins (quarter inch) = 45rs/f

     COST OF THE PROJECT FOR A ROOM (12*10*10):-

     DIMENSIONS OF THE ROOM :-

     • Aluminum area = 560ft^2

     • Stainless steel plate area = 300ft^2

       Costing calculation:-

     • Alluminium cost = 80*560= 44800rs

     • Stainless steel cost = 160*300= 48000rs

• Galvanized steel area =94ft^2

  Fan (75 w)= 1500rs

  Motor (1/2 HP) = 2500rs

• Wiring=3000rs

• Piping system = 2000rs

• Galvanized steel cost = 60*94= 5600rs

• Fan = 1500rs

• Motor = 2500rs

• Piping cost = 2000rs

• Fins = 25000rs

Total cost = 1,30,000rs(approx.)

WATER CHILLER SYSTEM AIR CONDITIONER

• Installation cost = 1,30,000rs

• Energy consumption :-

  Energy consuming devices are :-

  1. Electric motor=373w or0.373kw

• In 1 hour the pump will consume 0.373kwh or

  0.373 u(unit) .

• 10 hour a day = 3.73u

  In a year = 3.73*365= 1361.45u

• Cost of 1 unit = 3rs

• Cost of energy in a year = 1361.45*3

  =4084.35 or 4100rs

  (1.5Ton and 2 star rating)

• Installation cost(I Ton) = 30,000rs

• Energy consumption = 3kw

• In 1 hour A.C will consume = 3kwh or 3u

• For a day (8 hr)= 24u

  In a year= 24*365= 8760u

• ost of 1 unit = 3rs

• Cost of energy in a year= 3*8760

  = 26,280 0r 25000rs(approx)

  2. Electric fan = 75w or 0.075kw
  In a year = 0.75*365 =274 u
  TOTAL ENERGY COST = 5000rs	TOTAL ENERGY COST = 25000
  Year wise	Year wise
  After 1st year = 130000+5000=135000	After 1st year = 30000+25000
  2nd year= 135000+5000= 140000rs	=55000rs
  3rd year= 140000+5000=145000rs	2nd year= 55000+25000=80000rs
  4th year=145000+5000=150000rs	3rd year=80000+25000=105000rs
  5thyear=150000+5000=155000rs	4th year=105000+25000=130000rs
  	5th year=130000+25000=155000rs

  • I hr = 0.075 kwh

  • In a day (10 hr)= 0.75kwh

  • Cost of energy in a year = 274*3= 822rs

  • To cool a particular area it takes very less time than the air conditioner to reach the same temperature.

  • Large amount of energy saving is done .

  • The installation cost is although very large in comparison to an air conditioner, but after 5 years of working it gives the same total amount as an A.C. So in the 6th year

there is a complete profit of 20,000 rs .

• The plant works on the principle of natural convection, no requirement of forced system.

• To increase the conductivity fins are used on aluminum box.

• The plant uses water as a refrigerating liquid, which is in plenty at every place.

• In this era of energy scarcity , it will act as a major means of energy saving.

1. In 1906 Stuart H. Cramer designed an apparatus which adds water vapor in the hot air. The method was adopted in textile mills.

2. In 1910 Willis Havilland Carrier invented the first centrifugal compressor. This discovery gave the refrigeration system a new way.

3. In 1928 Willis Havilland Carrier developed the first weather maker.

4. In 1931 H.H. Schultz and J.Q. Sherman developed the first room air conditioner. It was made to fit on the window. it was very helpful in cooling buildings and apartments.

5. In 1935, Ingersoll-Rand developed an interesting centrifugal chiller that used water as the refrigerant but the system fails. In 1937 Buensod-Stacey and Trane together form the first centrifugal chiller.