ROOM CONDITIONER USING

VAPOUR COMPRESSOR REFRIGERATION

(USING HEAT EXCHANGER and REFRIGERATION)

BATCH - 08

GROUP MEMBERS :-DANIEL BASUMATARY 1021120233ROHIT KUMAR JAIN 1021120211ANAND KUMAR 1021120229MAYANK ANURAG 1021120232

Project Guide :- Mr. K.YOGANAND

ME ASST. PROFESSOR [O.G.]DEPT. OF MECHANICAL ENGINEERING

SRM UNIVERSITY - RAMAPURAM

ABSTRACT

In any AC system heat from air is extracted using compressor and refrigeration system with high amount of electrical energy and for less volume of air. The innovation in the project deals with replacement of cooling process of swamp cooler by refrigeration system and heat exchanger.The circuit in the system used is same as available for swamp cooler , refrigeration system and counter flow heat exchanger.

METHODOLOGY

The project works on combined mechanism of following three principles:-• Air suction mechanism - Evaporative cooler have high speed

rpm fan which gives high mass flow rate of air that is used for conditioning of enclosed system.

• VCR System – It is a system in which the refrigerant undergoes phase change from gas to liquid and gives the cooling effect.

• Heat Exchanging system – the evaporator of VCR system act as heat exchanger and cools the atmospheric air using refrigerant from VCR system.

INTRODUCTION

• COOLER• VAPOUR COMPRESSION REFRIGERATION

SYSTEM

An evaporative cooler is a system that cools air through the evaporation of water. Evaporative cooling differs from comercial air conditioning systems which use vapor-compression or absorption refrigeration cycles. Evaporative cooling works by heat exchange between water and air. The temperature of air is reduced by heat exchange between water and air by evaporation of water. In dry areas, evaporative cooling of air has the advantage of humidifying the air with more moisture for the comfort of cooling area.

COOLER

VAPOUR COMPRESSION REFRIGERATION SYSTEM

An air compressor is used to compress filtered nitrogen to high pressure; the high-pressure gas is cooled back to ambient temperature, and allowed to expand to a low pressure. The expanding vapor cools greatly .Small-scale production of liquid nitrogen is easily achieved using this principle. Liquid nitrogen is produced directly by this process.

AC Parameters Window AC Split AC Cassette AC

Suitable For Small rooms with a window sill

Any room with or without a window

Large indoor spaces

Noise Relatively on the higher side

Minimal noise Silent operation

Capacity range 0.75 ton to 2 ton 0.8 to 2 ton 1 ton to 4 ton

Advanced features Humidity control, dust filter Humidity control, dust filter, bacteria filter

Humidity control, dust filter, bacteria filter

Interference with home décor

Slight possibility to interfere with window curtains and drapes

Designer indoor units blend well with wall decor

Barely interferes with interior decor

Ease of installation Minimal effort required Indoor and outdoor units need some amount of effort for installation

Needs specialised false ceiling

Existing System

CALCULATION

• TEMPERATURESThi=318K Tho=288K

Tci=233K Tco=293K• LMTD Tlm= T2- T1/(ln( T2/ T1)=242.8

• HEAT TO BE EXTRACTEDQ=mh Cp dT=(3000/3600)x1005x30

= 19024.852J/sec

• AREA REQUIREDA = Q/U Tlm = 19024.852/(45x242.8)

= 1.74 m2

• AREA OF EACH TUBEAt = 2 = 2x 0.5 x 0.0108 = 0.034m2

• NUMBER OF TUBEN = 1.74/0.034 ~ 50-

Parts specification

• Fan : 3500 CFM• Compressor : Rotatory type 2.5KW• Condenser : 2 row condenser• Heat Exchanger : Cuboidal shape • Heat exchanger tube : Copper• Coolant : R22

FAN

Specification• DC FAN – 12V DC• POWER – 100 Watt• Diameter – 15 inch• No of blades – 8• Speed – 9000rpm• Air Output – 3500CFM

COMPRESSOR

• MODEL – 1.5 O-GENERAL RECIPROCATING COMPRESOR• POWER – 2.45KW (Running) 4.32KW (Starting) • HEIGHT – 15 INCHES• DIAMETER – 8 INCHES• PRESSURE – 300 bar• CURRENT – 10 Amp

CONDENSOR

• CAPACITY – 1.5 lit• HEIGHT – 16 INCHES• THIKNESS – 3 INCHES• WIDTH – 19 INCHES• NO OF TURNS – 8• TUBE THICKNESS – 8 mm• FINS – ALUMINUM FINS• TYPE – 2 ROW CONDENSOR

HEAT EXCHANGER SPECIFICATION

• Material used – copper• Dimensions inner tube : Length – 22 in Diameter – 0.75 in total -25 outer tube : Length – 20 in Diameter – 1 in total - 25• Array arrangement – 5*5• Joining process by Gas Welding.

FABRICATIONOF HEAT EXCHANGER

ASSEMBLY

WORKING

FAN

CONDENSOR

HEAT EXCHANGER

THROTTELCOMPRESSOR

HOT AIR IN

COLD AIR OUT

WORKING

• The VCR system regenerate the refrigerant by phase change and convert the refrigerant into liquid state from gaseous state.

• The liquid refrigerant flows through heat exchanger area and cools the heat exchanger which act as a evaporator of VCR system.

• The Fan starts the suction of atmospheric air in such a way that it crosses through the heat exchanger area and hence produces the cooling effect.

ADVANTAGE

• It gives Large mass flow rate of cold air.• The consumption of power is very less.• It has Easy working process.• High cooling area efficiency. • Instantaneous cooling effect is produced.• It does not work with recirculation of air , hence work with

fresh air always.• It works very well with good ventilated room , instead of

packed room.• It can be used in open area such as stage or any outdoor

activity.

Disadvantage

• Huge in size• Little noisy operation• High moisture content may be present in air• Heavy in weight.• Need absolute insulation around heat

exchanger.

COST ESTIMATION

• Heat Exchanger : Rs 6000• Compressor : Rs 4500• Condensor : Rs 2200• Fan : Rs 1500• Body : RS 3000• Electronic Equipment : Rs 2000• Fabrication Cost : 2000

CONCLUSION

With the ongoing energy crisis and pollutant emission constrains, use of room conditioner are much advantages. The difference between the outside air dry bulb temperature and the wet bulb temperature is the key factor which decides the use of evaporative coolers. Larger the difference, usefulness of room conditioner is better. Vaporative cooling can reduce the incoming ambient air temperature to the room considerably. It is inexpensive, energy efficient and potentially attractive. Pre cooling of refrigerant could enhance a direct room conditioner that cools the air even below its inlet WBT. The reduction in temperature comes at the expense of higher relative humidity. It may be disadvantages with some refrigerant.

LITERATURE REFRENCE

• Anand Kumar, Tyagi SK. Exergy analysis and experimental study of a vapor compression refrigeration cycle. J Therm Anal Calorim. 2011. doi:10.1007/s10973-011-1904-z.

• Gong, G, Zeng, W, Wang, L, Wu, C (2008) A new heat recovery technique for air-conditioning/heat-pump system. Appl Therm Eng 28: pp. 2360-2370

• http://shodhganga.inflibnet.ac.in/bitstream/10603/11543/7/07_ch

THANK YOU!!!