Performance evaluation of a air conditioner according to different test standards
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The document discusses performance testing of air conditioners according to different standards. It describes the experimental setup of an air conditioner test room built according to ASHRAE standards, which consists of indoor and outdoor insulated rooms that maintain specified temperature and humidity conditions. The document outlines the cooling capacity test procedure, which involves recording data over several hours to determine airflow and enthalpy values needed to calculate the air conditioner's cooling capacity in kW and tons of refrigeration according to specified formulas.
![International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN
0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME
186
Figure 7 Power(Units) Vs Temperature
The various factors observed amidst the testing were, amount of charge of refrigerant,
pressure drop, suction and discharge pressures, power, current etc. From these work different
procedures for testing air conditioners are established. The test results will give awareness to the
customers and manufacturers. Useful data is generated for the air conditioning engineers.
REFERENCES
[1] Akintunde, M.A. 2004b. Experimental Investigation of The performance of Vapor
Compression Refrigeration Systems. Federal University of Technology, Akure, Nigeria
[2] American Society Heating Refrigeration and Air Conditioning. ASHRAE Hand Book. 2001
[3] Wernick, B.J. “Effectiveness method”, RACA journal 2004.
[4]. C.P Arora, Refrigeration and Air conditioning. Tata McGraw-Hill Book Company
[5]. Stoecker, W.F. and Jones J.W. (1982), Refrigeration & Air Conditioning. McGraw-Hill Book
Company, Singapore
[6] Analytical expressions for optimum flow rates in evaporators and condensers of heat pumping
systems International Journal of Refrigeration, Volume 33, Issue 7, November 2010,
Pages 1211-1220 Granryd, E.
[7] Yumrutas R, kunduz M, Kanoglu M. Exergy analysis of vapor compression refrigeration
systems. Exergy, An international journal 2002;2(4);266-72.
[8] Dr.S.S. Banwait and Dr.S.C. Laroiya, “Properties of refrigerant and psychometric tables
and charts
[9] “Technical Manual Air-conditioning application, Tecumseh”. Tecumseh Products India Pvt.
Ltd., Hyderabad.
[10] Calorimeter Test Facility Lab manual (CTFLM) Tecumseh Products India Pvt. Ltd.
[11] Eckert, E.R.G.; Goldstein, R.J.; Ibele, W.E.; Patankar, S.V.; Simon, T.W.; Strykowski, P.J.;
Tamma, K.K.; Kuehn, T.H.; Bar-Cohen, A.; Heberlein, J.V.R.; (Sep 1997), Heat transfer--a
review of 1994 literature, International Journal of Heat and Mass Transfer 40-16, 3729-3804.
[12] N. Thangadurai and Dr. R. Dhanasekaran, “Effective Power Consumption Model for a
Network With Uniform Traffic Pattern”, International Journal of Computer Engineering &
Technology (IJCET), Volume 3, Issue 2, 2012, pp. 561 - 570, ISSN Print: 0976 – 6367, ISSN
Online: 0976 – 6375.
[13] Kapil Chopra, Dinesh Jain, Tushar Chandana and Anil Sharma, “Evaluation of Existing
Cooling Systems for Reducing Cooling Power Consumption”, International Journal of
Mechanical Engineering & Technology (IJMET), Volume 3, Issue 2, 2012, pp. 210 - 216,
ISSN Print: 0976 – 6340, ISSN Online: 0976 – 6359.
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Performance evaluation of a air conditioner according to different test standards
- 1. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 178 PERFORMANCE EVALUATION OF A AIR CONDITIONER ACCORDING TO DIFFERENT TEST STANDARDS K. Ravi Kumar, Asst Prof., Department of Mechanical Engineering, AHCET, Chevella, Ranga Reddy – 515002(A.P.), India. K. Ganesh Babu Asst Prof., Department of Mechanical Engineering, SITECH, Chevella, Ranga Reddy – 515002(A.P.), India S. Udaya Bhaskar Asso Prof., Department of Mechanical Engineering, AHCET, Chevella, Ranga Reddy – 515002(A.P.), India. ABSTRACT The Paper reports on the performance of Air Conditioner at different test standards. The future design of air conditioners is being driven primarily by (a) increased energy efficiency standards and (b) the need to eliminate ozone-depleting working fluids. Various national and international agencies continue to impose more stringent requirements for energy efficiency. In addition, consumer pressure to select units with lower operating costs further drives the need for improved performance. The main objective of this paper is to give wide understand of the standards and to maintain the standard conditions in Psychrometric room (Air conditioner test room), which has been constructed to test the air conditioners and to establish different test procedures. The tests that should be performed in Air conditioner test room are cooling capacity test, power consumption test. The main objective of the manufacturers is to produce the systems according to requirements of customers which can give more cooling, low power consumption, high EER to with stand competition in the market. In every country, the manufacturers follow some standards according to the climatic conditions to test the appliances. Keywords: Psychrometric room; EER; cooling capacity test; power consumption test; climatic conditions INTERNATIONAL JOURNAL OF ADVANCED RESEARCH IN ENGINEERING AND TECHNOLOGY (IJARET) ISSN 0976 - 6480 (Print) ISSN 0976 - 6499 (Online) Volume 4, Issue 3, April 2013, pp. 178-186 © IAEME: www.iaeme.com/ijaret.asp Journal Impact Factor (2013): 5.8376 (Calculated by GISI) www.jifactor.com IJARET © I A E M E
- 2. International Journal of Advanced Research in Engineering and 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME I INTRODUCTION India falls in the hot zone therefore the comfort air necessity for mankind. To achieve comfort, heat is extracted from the comfort region and transferred to the environment, which is at a higher temperature. This is done with the help of r Though there are many methods to achieve cooling, one process that is predominantly applied in refrigeration equipment and its application is vapor compression cycle. One of the applications of vapor compression system is in Air conditioning conditioners, and then comes the Packaged systems which are used for higher tonnages till 50Ton. Ever since the invention of Air Conditioning as one of Refrigeration application by W H Carrier in US in earlier 19th Century, there has been a radical change in the methods and process used in manufacturing air-conditioning equipment but there is no change in the principle i.e. Vapor compression system used in the cycle. II.EXPERIMENTAL SETUP Air conditioner test room is constructed according to ASHREA standards. It consists of two rooms made of adiabatic material of rigid polyurethane, one is indoor side room and another is outdoor side room. The outside room ambient is controlled from 25 temperature control or load control. For testing or air conditioner, maintaining of temperatures is important so these two rooms are made of adiabatic material. The method use in air conditioner test room for finding capacity is air enthalpy which the non-ducted equipment (test air conditioner) is mounted which the non (test air conditioner) is mounted. The equipments associated with air conditioner test room as follo (a) Panel Boards (b) Split AC Indoor Unit Installation (c) Split AC Outdoor Unit Installation (d) Packaged Air conditioners (e) Humidifiers (f) Code Tester (g) Temperature measuring instrument (h) Heaters (g) Sampling device Fig.1. Psychrometric Laboratory view International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 179 therefore the comfort air-conditioning has always been felt to be a necessity for mankind. To achieve comfort, heat is extracted from the comfort region and transferred to the environment, which is at a higher temperature. This is done with the help of r Though there are many methods to achieve cooling, one process that is predominantly applied in refrigeration equipment and its application is vapor compression cycle. One of the applications of vapor compression system is in Air conditioning units, the more commonly used one is Room Air conditioners, and then comes the Packaged systems which are used for higher tonnages till 50Ton. Ever since the invention of Air Conditioning as one of Refrigeration application by W H Carrier in Century, there has been a radical change in the methods and process used in conditioning equipment but there is no change in the principle i.e. Vapor compression system used in the cycle. room is constructed according to ASHREA standards. It consists of two rooms made of adiabatic material of rigid polyurethane, one is indoor side room and another is outdoor side room. The outside room ambient is controlled from 25o C to 55o C. While indoor s temperature control or load control. For testing or air conditioner, maintaining of temperatures is important so these two rooms are made of adiabatic material. The method use in air conditioner test room for finding capacity is air enthalpy method. These two rooms are separated by an opening in to ducted equipment (test air conditioner) is mounted which the non-ducted equipment The equipments associated with air conditioner test room as follows: Split AC Indoor Unit Installation Split AC Outdoor Unit Installation Temperature measuring instrument sychrometric Laboratory view Fig.2 Split AC Indoor Unit Installation Technology (IJARET), ISSN 6499(Online) Volume 4, Issue 3, April (2013), © IAEME conditioning has always been felt to be a necessity for mankind. To achieve comfort, heat is extracted from the comfort region and transferred to the environment, which is at a higher temperature. This is done with the help of refrigeration. Though there are many methods to achieve cooling, one process that is predominantly applied in refrigeration equipment and its application is vapor compression cycle. One of the applications of units, the more commonly used one is Room Air- conditioners, and then comes the Packaged systems which are used for higher tonnages till 50Ton. Ever since the invention of Air Conditioning as one of Refrigeration application by W H Carrier in Century, there has been a radical change in the methods and process used in conditioning equipment but there is no change in the principle i.e. Vapor room is constructed according to ASHREA standards. It consists of two rooms made of adiabatic material of rigid polyurethane, one is indoor side room and another is outdoor side C. While indoor side has either temperature control or load control. For testing or air conditioner, maintaining of temperatures is important so these two rooms are made of adiabatic material. The method use in air conditioner test method. These two rooms are separated by an opening in to ducted equipment Split AC Indoor Unit Installation
- 3. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 180 Fig.3 Split AC Outdoor Unit Installation Fig.4. Code Tester Fig.5. Temperature Measuring Device III. COOLING CAPACITY TEST AND CALCULATIONS TEST CONDITIONS: The test conditions that should be maintained are as follows: ISO 5151 standard Indoor side Outdoor side DBT o C WBT o C DBT o C WBT o C 27 19 35 24 PROCEDURE Out let of air conditioner (which is going to be tested) is attached to the receiving chamber of the code tester through the proper ducting. Before starting the main switch, ensure that all the switches of panel Board are in disable or not. Before starting the test, clean all the sensors and fill water in all sampling devices. Set the temperatures values, which are going, to be maintained in PID’S of the panel boards Switch on the test unit by adjusting dimmer to 230 volts.
- 4. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 181 For example: we are maintaining DBT–35°C, WBT-24°c in outdoor side and DBT-27°C, WBT- 19°C indoor side (according to ISO standard) When temperature is stabilized there arithmetic mean value should have Outdoor side conditions o C Outdoor side conditions o C DBT 35±0.3 DBT 27±0.3 WBT 24±0.2 WBT 19±0.2 After stabilization, to maintain the test conditions for 4 hours, and record the data after 30 minutes so that there are 7 set of readings for every 5 min. During this 30 min duration, record the code tester nozzle pressure drop. When receiving chamber pressure shows 0.0 and record code tester DBT and WBT readings also. The sensor temperature that should be recorded are: 102 Indoors side DBT 103 Indoors side WBT 104 Outdoors side DBT 105 Outdoors side WBT 106 Indoor side Code tester DBT 107 Indoor side Code tester WBT Average the recorded data. So that we can get more appropriate one value. For convenience not indoor side room temperature from 102 and 103 sensors and leaving air condition from 106 and 107 sensors. For calculation of CFM: Cfm =Ci*Ai*Yi*√2Dp/p*3600*0.5885 Where ρ=density of air at the air sampling condition kg/m3 . Ci= Discharge co-efficient of its nozzle dimensionless. Ai=Area of the nozzle in m2 . Yi=expansion factor, dimensionless. Dp=pressure drop across the nozzle in Pa. Ci, Yi can be calculated from ASHRAE 41 FORMULAE FOR COOLING CAPACITY CALCULATIONS: Volume Flow rate of air Qva(m3 /sec)= Cfm/2118.88 Enthalpy difference Dh = Enthalpy of moist air entering - Enthalpy of moist air leaving Mass flow rate of air Ma(kg/s) =Volume flow rate of air/Specific volume of air Cooling capacity in KW =Mass flow rate of air*Enthalpy difference Cooling capacity in Btu/hr=Cooling capacity in KW*3412.14 Cooling capacity in Ton of refrigeration=Cooling capacity in KW/3.5167 CALCULATIONS Calculations at 35 o C Ambient: Entering air conditions: DBT-27.11 o C,WBT-19.27 o C Saturation pr.at DBT, Ps= 610.78*EXP(DBT/(DBT+238.3)*17.2694)/1000 =610.78*EXP(27.11/(27.11+238.3)*17.2694)/1000 =3.5642 kpa
- 5. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 182 vSaturation pr. at WBT, P l = 610.78*EXP(WBT/(WBT+238.3)*17.2694)/1000 =610.78*EXP(19.27/(19.27+238.3)*17.2694)/1000 =2.2232 kpa Actual vapour pressure, l l Pv = Pv -(((Pt- Pv )*(DBT-WBT)*(1.8))/(2800-1.3((1.8*DBT)+32)) = 2.2232-(((101.325-2.2232)*(27.11-19.27)*(1.8))/(2800-1.3((1.8*27.11)+32)) = 1.7042 kpa Humidity ratio, W = 0.622*(Pv/(Pt-Pv)) = 0.622*(1.7042/(101.325-1.7042)) = 0.01064 Enthalpy of moist air, hen = (1.005*DBT) + (W*(2500+(1.88*DBT))) = (1.005*27.11) + (0.01064*(2500+(1.88*27.11))) = 54.3878 kj/kg Specific volume of air, Ven = (287.3*(273+DBT))/((Pt-Pv)*1000) = (287.3*(273+27.11))/((101.325-1.7042)*1000) = 0.8654 m 3 /kg Density of moist air, Den = 1/Ven = 1/0.8653 = 1.1556 kg/m 3 Leaving air conditions: DBT-13.78 o C,WBT-12.25 o C Saturation pr. at DBT, Ps = 610.78*EXP(DBT/(DBT+238.3)*17.2694)/1000 =610.78*EXP(13.78/(13.78+238.3)*17.2694)/1000 =1.5699 kpa Saturation pr. At WBT, P = 610.78*EXP(WBT/(WBT+238.3)*17.2694)/1000 =610.78*EXP(12.25/(12.25+238.3)*17.2694)/1000 =1.4209 kpa40 Actual vapour pressure, l Pv = Pv -(((Pt- Pv )*(DBT-WBT)*(1.8))/(2800-1.3((1.8*DBT)+32)) = 1.4209-(((101.325-1.4209)*(13.78-12.25)*(1.8))/(2800-1.3((1.8*13.78)+32)) = 1.3199 kpa Humidity ratio, W = 0.622*(Pv/(Pt-Pv)) = 0.622*(1.3199/(101.325-1.3199)) = 0.0082 Enthalpy of moist air, hle = (1.005*DBT) + (W*(2500+(1.88*DBT))) = (1.005*13.78) + (0.0082*(2500+(1.88*13.78))) = 34.5613 kj/kg
- 6. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 183 Specific volume of air, Vle = (287.3*(273+DBT))/((Pt-Pv)*1000) = (287.3*(273+13.78))/((101.325-1.3199)*1000) = 0.8238 m 3 /kg Density of moist air, Dle = 1/Vle = 1/0.8238 =1.2138 kg/m 3 Calculations for Cooling capacity : Area, Ai = ((22/7*4)*SQRT(48.66/1000))+((22/7*4)*SQRT(99.43/1000)) = 0.00962 m 2 Cubic flow per minute, Cfm = Ci*Yi*Ai*SQRT((2*Dp)/Dle)*3600*0.5885 =0.985*0.998*0.00962*SQRT((2*445)/1.2138)*3600* 0.5885 = 542.56 or 543 Volume flow rate,Qva= Cfm/2118.88 = 543/2118.88 = 0.2562 m 3 /sec Enthalpy difference, Dh = hen-hle = 54.3878 - 34.5613 = 19.8265 kj/kg Mass flow rate, Ma = Volume flow rate (Qva)/Specific volume of leaving air (Vle) = 0.2562/0.8238 = 0.3109 kg/sec Cooling capacity in KW = Mass flow rate (Ma)*Enthalpy difference (Dh) = 0.3109*19.8265 = 6.1640 kw Cooling capacity in Btu/hr = cooling capacity in kw*3412.14 = 6.1640*3412.14 = 21032.43 Btu/hr Cooling capacity in TON of refrigeration = cooling capacity in kw / 3.516 = 6.1640 / 3.516 = 1.7531 Ton Energy efficiency ratio,EER = (cooling capacity in Btu/hr) / (Input power in watts) = 21032/2240 = 9.389 Btu/W-hr
- 7. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 184 POWER CONSUMPTION TEST Test conditions: The various test conditions that should be maintained for Power consumption test are as Follows:ISO 5151 Standard Indoor side Outdoor side DBT o C WBT o C DBT o C WBT o C 27 19 35 24 CALCULATIONS Power Consumption Test of AC at 35o C Ambient Power consumed by air conditioner for 24hr = Final Energy meter reading – Initial Energy meter reading =5332.7 – 5316.2 = 16.5 Kw-hr Power consumed of 1hr = 16.5/24 =0.687 Kw/hr Power Consumption Test of AC at 46o C Ambient Power consumed by air conditioner for 24hr = Final Energy meter reading – Initial Energy meter reading =5358.5 – 5334 = 24.5 Kw-hr Power consumed of 1hr = 24.5/24 =1.021 Kw/hr STARTABILITY TEST Test conditions: - The various test conditions that should be maintained are given below: (a) BIS 1391:1992 Indoor side room °C Outdoor side room °C Voltage DBT WBT DBT WBT V 35 24 46 27 90% &110% of rated voltage. (b) BIS 1391:1992(For Export A &B) Indoor side room °C Outdoor side room °C Voltage DBT WBT DBT WBT V 32 23 43 26 90% &110% of rated voltage. 32 23 52 31 95% minimum voltage&110% of maximum voltage with dual rated voltage.
- 8. International Journal of Advanced Research in Engineering and 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME Procedure for Down Trip: (1) Take the cold resistance of the system (i.e. Main, Auxiliary and Total resistances) before starting the system. (2) Start the appliance at 220/230V according to the request by maintaining Indoor sideroom DBT27o C, WBT-19 o C and Outdoor side room DBT stable conditions and optimizing for 3 to 4 hours record the data of pressures (standard suction 70±5 psig anddischarge 300 placed at different places in the applian (a) Indoor side room DBT and WBT (b) Outdoor side room DBT and WBT (c) Top shell and bottom shell (d) Condenser in and condenser out (e) Evaporator in an evaporator out (f) Suction line and Dischar IV RESULTS AND CONCLUSIONS Every product that is manufactured is tested to know how it works and up to what level it can satisfy the requirements of customers. The main objective of this project is testing the Air conditioner appliance according to different standards by maintaining different climatic conditions in Air conditioner test room. The testing includes cooling test, power consumption test. From capacity test, cooling capacity of system at different temperatures is known. Cooling capacity test is done on air conditioner appliance. The specification given by manufacturer for cooling capacity of Air Conditioner at 35o C ambient is 21200 Btu/hr, by conducting capacity test in the Air conditioner test room it is found that its capacity is lower Similarly cooling capacity at 46o C and 54 Figure Power consumption test is done on air conditioner and found that it 16.5 Kwhr units power i.e 0.687 kw/hr at 35 24.5 Kwhr units of power i.e 1.021 kw/hr in Air conditioner test room. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 185 Take the cold resistance of the system (i.e. Main, Auxiliary and Total resistances) before Start the appliance at 220/230V according to the request by maintaining Indoor sideroom C and Outdoor side room DBT-35 o C, WBT-24 o C. After reaching the stable conditions and optimizing for 3 to 4 hours record the data of pressures (standard 5 psig anddischarge 300±10 psig), temperatures, current and power. Sensors are placed at different places in the appliance to record the temperatures of the following Indoor side room DBT and WBT Outdoor side room DBT and WBT Top shell and bottom shell Condenser in and condenser out Evaporator in an evaporator out Suction line and Discharge line IV RESULTS AND CONCLUSIONS Every product that is manufactured is tested to know how it works and up to what level it can satisfy the requirements of customers. The main objective of this project is testing the Air conditioner to different standards by maintaining different climatic conditions in Air conditioner test room. The testing includes cooling test, power consumption test. From capacity test, cooling capacity of system at different temperatures is known. Cooling test is done on air conditioner appliance. The specification given by manufacturer for cooling C ambient is 21200 Btu/hr, by conducting capacity test in the Air conditioner test room it is found that its capacity is lower by 1.4% i.e 20908 Btu/hr at 35 C and 54o C ambient is found as 19332Btu/hr and 5582 Btu/hr. Figure 6 EER Vs Temperature Power consumption test is done on air conditioner and found that it consumes when operated for 24 hr 16.5 Kwhr units power i.e 0.687 kw/hr at 35o C Ambient. At 46o C Ambient it is found that it consumes 24.5 Kwhr units of power i.e 1.021 kw/hr in Air conditioner test room. Technology (IJARET), ISSN 6499(Online) Volume 4, Issue 3, April (2013), © IAEME Take the cold resistance of the system (i.e. Main, Auxiliary and Total resistances) before Start the appliance at 220/230V according to the request by maintaining Indoor sideroom C. After reaching the stable conditions and optimizing for 3 to 4 hours record the data of pressures (standard 10 psig), temperatures, current and power. Sensors are ce to record the temperatures of the following Every product that is manufactured is tested to know how it works and up to what level it can satisfy the requirements of customers. The main objective of this project is testing the Air conditioner to different standards by maintaining different climatic conditions in Air From capacity test, cooling capacity of system at different temperatures is known. Cooling test is done on air conditioner appliance. The specification given by manufacturer for cooling C ambient is 21200 Btu/hr, by conducting capacity test in the Air by 1.4% i.e 20908 Btu/hr at 35o C ambient. C ambient is found as 19332Btu/hr and 5582 Btu/hr. consumes when operated for 24 hr C Ambient it is found that it consumes
- 9. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 – 6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME 186 Figure 7 Power(Units) Vs Temperature The various factors observed amidst the testing were, amount of charge of refrigerant, pressure drop, suction and discharge pressures, power, current etc. From these work different procedures for testing air conditioners are established. The test results will give awareness to the customers and manufacturers. Useful data is generated for the air conditioning engineers. REFERENCES [1] Akintunde, M.A. 2004b. Experimental Investigation of The performance of Vapor Compression Refrigeration Systems. Federal University of Technology, Akure, Nigeria [2] American Society Heating Refrigeration and Air Conditioning. ASHRAE Hand Book. 2001 [3] Wernick, B.J. “Effectiveness method”, RACA journal 2004. [4]. C.P Arora, Refrigeration and Air conditioning. Tata McGraw-Hill Book Company [5]. Stoecker, W.F. and Jones J.W. (1982), Refrigeration & Air Conditioning. McGraw-Hill Book Company, Singapore [6] Analytical expressions for optimum flow rates in evaporators and condensers of heat pumping systems International Journal of Refrigeration, Volume 33, Issue 7, November 2010, Pages 1211-1220 Granryd, E. [7] Yumrutas R, kunduz M, Kanoglu M. Exergy analysis of vapor compression refrigeration systems. Exergy, An international journal 2002;2(4);266-72. [8] Dr.S.S. Banwait and Dr.S.C. Laroiya, “Properties of refrigerant and psychometric tables and charts [9] “Technical Manual Air-conditioning application, Tecumseh”. Tecumseh Products India Pvt. Ltd., Hyderabad. [10] Calorimeter Test Facility Lab manual (CTFLM) Tecumseh Products India Pvt. Ltd. [11] Eckert, E.R.G.; Goldstein, R.J.; Ibele, W.E.; Patankar, S.V.; Simon, T.W.; Strykowski, P.J.; Tamma, K.K.; Kuehn, T.H.; Bar-Cohen, A.; Heberlein, J.V.R.; (Sep 1997), Heat transfer--a review of 1994 literature, International Journal of Heat and Mass Transfer 40-16, 3729-3804. [12] N. Thangadurai and Dr. R. Dhanasekaran, “Effective Power Consumption Model for a Network With Uniform Traffic Pattern”, International Journal of Computer Engineering & Technology (IJCET), Volume 3, Issue 2, 2012, pp. 561 - 570, ISSN Print: 0976 – 6367, ISSN Online: 0976 – 6375. [13] Kapil Chopra, Dinesh Jain, Tushar Chandana and Anil Sharma, “Evaluation of Existing Cooling Systems for Reducing Cooling Power Consumption”, International Journal of Mechanical Engineering & Technology (IJMET), Volume 3, Issue 2, 2012, pp. 210 - 216, ISSN Print: 0976 – 6340, ISSN Online: 0976 – 6359. 0 2 4 6 8 10 35 46 54 EER