Design and Fabrication of Modified Air Conditioner with Split Cooling Unit

London Journal of Engineering Research
Volume | Issue | Compilation
Authored by Deepak Chauhan , Ravi Prakash Sethi, Aviraaz Chandra, Ashwani Sharma, Vivek Verma
Classification: For Code: 090603p, 090604
Keywords: split air conditioning.
Language: English

Energy consumption all over the world is increasing day by day and there is need to develop new ways to conserve energy for future requirements. Air conditioner used in summer seasons, uses vapor compression refrigeration system which consumes large amount of power usually about 1.5 to 3.5 KW and is also very costly. This paper describes the design and fabrication of modified air conditioner with split cooling unit. Basically, it is portable form of central air conditioning system which uses a low power compressor (refrigerator) for cooling a chamber containing water. This cooled water is then circulated for air conditioning. Performance analysis shows that it produced decent cooling and reduced power consumption.

               

Design and Fabrication of Modified Air Conditioner with Split Cooling Unit

Chauhan Deepak Ramsamujhα, Ravi Prakash Sethiσ, Aviraaz Chandraρ, Ashwani Sharma¥                       & Vivek Verma§

____________________________________________

  1. ABSTRACT

Energy consumption all over the world is increasing day by day and there is need to develop new ways to conserve energy for future requirements. Air conditioner used in summer seasons, uses vapor compression refrigeration system which consumes large amount of power usually about 1.5 to 3.5 KW and is also very costly. This paper describes the design and fabrication of modified air conditioner with split cooling unit. Basically, it is portable form of central air conditioning system which uses a low power compressor (refrigerator) for cooling a chamber containing water. This cooled water is then circulated for air conditioning. Performance analysis shows that it produced decent cooling and reduced power consumption.

Keywords: split air conditioning.

Author α σ ρ: UG Scholar, Mechanical and Automation Engineering, Amity University, Lucknow.

Author ¥ §: Assistant Professor, Mechanical and Automation Engineering, Amity University, Lucknow.

  1. INTRODUCTION

Due to great consumption of energy in buildings and industries, there is a need to design an energy efficient system which consumes less power. In India, Union ministry of power’s research pointed out that about 20 to 25% of total electricity utilized in government buildings gets waste due to non-productive designs of the components and systems resulting in the loss of about Rs. 1.5 billion. Conventional vapor compression air conditioning systems consumes very large portion of electrical energy which is produced by fossil fuels. This type of air conditioning is therefore neither eco- friendly nor sustainable. 

  1. DESIGN LAYOUT

In this design, we have implemented a split cooling unit which is coupled with the chiller plant. This split unit will take water from the insulated water tank with the help of pump, and circulate it through heat exchangers. Thus, the air will become cool without increasing its humidity.

C:\Users\ASTON\AppData\Local\Microsoft\Windows\INetCache\Content.Word\Modified Split AC.JPG

Fig. 1:  Block diagram of the model

The split unit is a simple rectangular insulated tank. In this tank, there is a heat exchanger i.e. a cooling coil. The water in the water tank is cooled with the help of refrigerant. This cooled water is pumped and then supplied to the split cooling unit. The purpose of the chiller plant is only to cool water in its tank.

3.1  Working

The working of the system starts with from outdoor unit which is consisting of Water Pump, Insulated Water tank, Compressor, Condenser, Cooling coil and connecting pipes, metallic duct. The water will be chilled with the help of compressor and the cooling coil assembled in the tank. Now, the chilled water will be pumped from water tank to the indoor unit equipped with cooling coils with the help of supply pump and connecting pipe.

The cooling coil in the indoor unit will be cooled with the help of chilled water coming from the water tank, the fins of the cooling coil will suddenly cool below -10 °C. The blower which is just above the cooling coil will suck the hot and humid air from the room and will give the conditioned air.

The advantages of modified split air conditioner unit are:

  • The installation cost of the overall unit will be minimum compared to the window air conditioner.
  • No Penta Plates required to cool the system.
  • It can easily condition a small office or room of 10*10 Sq. Ft.
  • The quality of the air conditioning will be very close to the normal air conditioning system.
  • It is a very low power consuming device because here we have used 1/6 HP 1 Amp. Compressor to cool the water tank.
  • Maintenance cost of the system is relatively low and easy.
  • The whole unit will be cost about Rs. 6 to 8 thousand only.

The device will be easily operated on voltage range of 160 V to 230 V

  1. FABRICATION

Various tools and equipment’s are used to fabricate the modified split air conditioner unit.

The primary components of the refrigeration system are:

Equipment’s

Specifications

Water Tank

10 Liter.

Insulating material

2 Meter.

Compressor

1/8 HP (1 Amp.)

Condenser

1

Evaporator (Cooling Coil)

2

Water Pump

1

Evaporative Fan

1

Connecting Pipes

7 feet

Drier Filter

1

Charging Pin

1

Capillary

1

¼ Copper Pipe

2 feet.

Brazing Rod

2

Thermostat

1

a) Compressor: The compressor here used is 1/8 HP 1 Amp. Hermitically sealed Reciprocating compressor used in refrigerator.

C:\Users\ASTON\AppData\Local\Microsoft\Windows\INetCache\Content.Word\IMG_20170324_151914917.jpg

Fig. 2: Compressor

b) Condenser: It allows the high pressure & temperature vapor refrigerant to cool down and condense to a highly-pressurized liquid. The condensing refrigerant loses heat to the atmosphere. Air or water are the medium used for the heat transfer. De-superheating, condensing and sub cooling of refrigerant takes place in the condenser.

C:\Users\ASTON\AppData\Local\Microsoft\Windows\INetCache\Content.Word\IMG_20170324_151305543.jpg

Fig. 3: Air Cooled Condenser

c) Evaporator (cooling coil): It allows the low- pressure refrigerant to evaporate at low temperature. The evaporating refrigerant absorbs heat from the refrigerated space and cools it. The refrigerant becomes a low-pressure vapor and renters the compressor. It is normally made of aluminum tubing attached with fins.

C:\Users\ASTON\AppData\Local\Microsoft\Windows\INetCache\Content.Word\IMG_20170324_151147012.jpg

Fig. 4: Cooling coil

d) Capillary: Capillary tube resists fluid flow. It is a long length of seamless small & accurate diameter tubing. It reduces pressure, by reducing the flow of refrigerant through its length. It is the dividing point between the high and low pressure sides of the system.

C:\Users\ASTON\AppData\Local\Microsoft\Windows\INetCache\Content.Word\IMG_20170324_151406200.jpg

Fig. 5: Capillary Tube

e) Insulated Water tank: A water tank of approx. 10 liters is used to store the water as a reservoir. It is completely insulated so that no heat is loss. A cooling coil is kept inside the water tank to cool the water. It also consists a submersible pump. 

C:\Users\ASTON\AppData\Local\Microsoft\Windows\INetCache\Content.Word\IMG_20170328_152028324.jpg

Fig. 6: Water Tank

f) Submersible Pump: A submersible pump is placed inside the liquid cooling block. It pumps the water from the liquid cooling block to the Aluminum heat exchanger tubes. The water then flows into the sump.

Fig. 7: Submersible Pump

3.2  Fabricated System

The experimental setup is as shown in the above figure. In this split type air conditioner, the indoor and outdoor sections of the room air conditioners are separated into two cabinets. The indoor units consist of evaporator coil and evaporator blower or fan. It is installed inside the room to be conditioned. It can be installed on ceiling, walls or on the floor. It is also known as fan coil unit or evaporator unit.

Fig. 8:  Working model of AC

The outdoor unit consist of an insulated water tank of about 10 Liters, 1/6 HP Compressor, condenser, dry filter and an evaporator also known as cooling coil to cool the water in the tank, a capillary (expansion valves) and a water pump to pump the water to the indoor unit through PVC pipes. The outdoor unit is also known as chiller plant. The distance between indoor and outdoor units has to be as close as possible and the lines should have less number of bents. Since the compressor is installed away from the room to be conditioned, the noise level is appreciably lower than room window air conditioners.

3.3  Working

The working of the system starts with from outdoor unit which is consisting of Water Pump, Insulated Water tank, Compressor, Condenser, Cooling coil and connecting pipes, metallic duct. The water will be chilled with the help of compressor and the cooling coil assembled in the tank. Now, the chilled water will be pumped from water tank to the indoor unit equipped with cooling coils with the help of supply pump and connecting pipe.

The cooling coil in the indoor unit will be cooled with the help of chilled water coming from the water tank, the fins of the cooling coil will suddenly cool below -10 °C. The blower which is just above the cooling coil will suck the hot and humid air from the room and will give the conditioned air.

V.   PERFORMANCE ANALYSIS

The output of Modified Split Air Conditioner is:

  1. Lower room temperature.
  2. Controlled humidity.

Experiment was conducted for 4 hours in a small room of 3X3X3 feet made of wooden board. Dry bulb temperature (DBT) and wet bulb temperature (WBT) was recorded at interval of 30 minutes. and relative humidity (RH) was calculated using psychrometric calculator[3].at an altitude of 123m (in Lucknow)

Initial Condition:

DBT= 36 °C

WBT= 30°C

Relative humidity: 65%

Table 1: Observation Table

Sr. No.

Time (min.)

 DBT (°C)

WBT (°C)

RH (%)

1

00

36

30

65

2.

20

35

29

64

3.

40

33.5

28.5

69

4.

60

32

27

68

5.

80

30

26

73

6.

100

28

24

72

7

120

27

22

65

8

140

26.5

20.5

58

9

160

26

20

58

10

180

25.5

20

61

11

200

25

19.7

62

12

220

25

19.5

60

13

240

25

19.5

60

Fig. 9: Time v/s Temperature Curve

From the reading of Table 2 it was observed that after 4 hours the room temperature decreases from 36°C to 25°C by using Modified Split Air Conditioner. RH on other hand reduces from 65 % to 60%.

On psychrometric chart the effect of this system on temperature and humidity can be observed by process 1-2.

Fig. 10:  Process on Psychrometric chart

  1. RESULTS & CONCLUSION

The results are as follows: -

  • The split unit maintain the temperature of room up to 25°C so it reduces the temperature of the air by 11°C.
  • The total power consumption of the whole unit is 140 Watt, which is quite less than that of AC. As the unit contains 1/8 HP compressor of 110 Watt, a submersible pump 19 Watt, An Evaporative Fan 10 Watt its power consumption is 140 Watt.
  • It does not increase the humidity of air, the unit cools air sensibly.

The performance analysis confirmed that the modified split AC has decent cooling and moisture control. It can provide a Ac with low operating cost.

REFERENCES

  1. Manohar Prasad, (2006), “Refrigeration and Air Conditioning”, New Age Inter-national   Publishers, New Delhi.
  2. Godrej ‘The complete appliance service Handbook’
  3. http://www.kwangu.com/work/psychrometric.htm

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