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Performance Characteristicsof a Condenser in a Vapor Compression Refrigeration System using an Inverter type and Conventional type Compressor

CLARK LOUISSE A. REGALADOBSME - 5

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Statement of the Problem

Condenser Fins

Researcher : S.Rama SubbaiahPost Graduate Student Department of Mechanical EngineeringGlobal College of Engineering & Technology,Kadapa, YSR (Dt), AP, India.

• To determine the performance of a condenser in a Vapor Compression Refrigeration System using an inverter and conventional type compressor

• To be able to analyze the performance of a condenser in a Vapor Compression Refrigeration System using an inverter and conventional type compressor.

Objectives of the Study

The importance of this study is to give us an analysis about using inverter and conventional type compressor in a vapor compression refrigeration system and know its advantages and the benefits it will give on the refrigeration system.

Significance of the Study

This study will focus only on the response of the condenser using the performance of the inverter type and conventional type compressor in a vapor compression refrigeration system.

This study also limits only on the performance of the condenser by using inverter and conventional type compressor in a vapor compression refrigeration system.

Scope and Limitation

Process Flow

Process 1→2 Isentropic Compression 2→3 Isobaric Heat Rejection 3→4 Isentropic Expansion 4→1 Isobaric Heat Addition

• Analysis of Condensers:

Qc = m(h2-h3)

Where:

m - is the mass flow rate of the refrigerant h2 - is the inlet enthalpy of the refrigerant h3 - is the outlet enthalpy of the refrigerant

Theoretical Framework

Experimental Set-up

•

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Designing

Materials and Tools Gathering

Construction of the Prototype

Leak Testing and

Cleaning LeakRepair

Refrigerant Charging NoneTest

RunExperiment

error

Data Gathering

Heat Transfer Analysis in the Condenser

Methodology

SIMULATION On the Heat Transfer at Condenser

INVERTER SIMULATION

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CONVENTIONAL SIMULATION

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 1200

20

40

60

80

100

120

140

160

180

200

INVERTER 1st TRIAL

Inverter Capillary 1Inverter Capillary 2Inverter Capillary 3

minutes

Heat

Rej

ecte

dFOR INVERTER DRIVEN COMPRESSOR :

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5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 1001051101151200

50

100

150

200

250INVERTER 2nd TRIAL

Inverter Capillary 1Inverter Capillary 2Inverter Capillary 3

minutes

Heat

Rej

ecte

d

•

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 1001051101151200

20

40

60

80

100

120

140

160

180

200

INVERTER 3rd TRIAL

Inverter Capillary 1Inverter Capillary 2Inverter Capillary 3

minutes

Heat

Rej

ecte

d

For CONVENTIONAL DRIVEN COMPRESSOR

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 1200

102030405060708090

100110120130140150160170180190200

Conventional Average Results Trial 1,2 and 3 of Capillary 1

Heat Rejected (Kj/kg)

minutes

Heat

Rej

ecte

d

CAPILLARY 1

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 1001051101151200

102030405060708090

100110120130140150160170180190

Conventional Average Results of Trial 1,2 and 3 of Capillary 2

Heat Rejected (Kj/kg)

minutes

Heat

Rej

ecte

d

CAPILLARY 2

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95100

105110

115120

0102030405060708090

100110120130140150160170180190200

Conventional Average Results of Trial 1,2 and 3 Using Capillary 3

Heat Rejected (Kj/kg)

minutes

Heat

Rej

ecte

d

CAPILLARY 3

Timepressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet

5 0.011 4.2 248.9 244.7

10 0.016 7.1 252.5 245.415 0.012 10 255.4 245.420 0.014 176.1 421.5 245.425 0.017 175.9 421.2 245.330 0.019 176.8 422.9 246.135 0.014 16 261.3 245.340 0.018 176.7 423.5 246.845 0.019 176.6 424.1 247.550 0.019 178.2 425.7 247.555 0.014 176.3 423.8 247.560 0.014 175.8 424 248.265 0.014 175.5 423 247.570 0.024 7.8 248.2 240.475 0.022 19.9 268.8 248.980 0.021 175.3 422.8 247.585 0.016 171.5 423.3 251.890 0.023 173 425.5 252.595 0.017 170.8 422.6 251.8

100 0.019 172.6 424.4 251.8105 0.022 14.7 266.5 251.8110 0.019 174.6 426.4 251.8115 0.017 176.8 427.9 251.1

120 0.016 16.9 267.2 250.3

For Inverter Driven Compressor :Trial 1 using Capillary 1

Time (mins) pressure drop (Kpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet

5 0.117333333 12.83333333 263.7 250.866666710 0.068666667 67.26666667 323.4 256.133333315 0.015333333 123.4333333 384.9 261.466666720 0.015666667 127.3666667 386.9 259.533333325 0.026666667 125.6333333 384.6666667 259.033333330 0.025666667 127.3666667 385.2 257.833333335 0.026666667 126.6666667 384.2333333 257.566666740 0.021333333 129.2666667 384.6666667 255.445 0.021333333 129.3 386.9 257.650 0.023 178.3 434.6333333 256.333333355 0.025666667 180.9333333 435.6 254.666666760 0.025333333 179.7333333 434.4333333 254.765 0.023333333 178.8666667 433.5666667 254.770 0.021666667 130.1666667 384.1 253.933333375 0.021333333 127.9333333 382.1666667 254.233333380 0.025333333 130.4 383.1666667 252.766666785 0.016666667 180.5666667 433.8333333 253.266666790 0.023666667 132.5333333 383.8333333 251.395 0.021666667 182.7666667 433.3333333 250.5666667

100 0.016 182.8666667 433.7 250.8333333105 0.019666667 131.1 383.1666667 252.0666667110 0.023666667 131.6666667 382.0333333 250.3666667115 0.014333333 182.7 433.3 250.6120 0.021666667 132.1 383.7 251.6

Trial 1 using Capillary 2

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Time (mins)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.06 12.4 264.9 252.5

10 0.023 20.2 277 256.815 0.012 167.3 427 259.720 0.007 171.3 432.5 261.225 0.006 175.9 437.1 261.230 0.007 172.9 435.6 262.735 0.005 178 439.6 261.640 0.009 175.8 439.2 263.445 0.015 179.1 438.8 259.750 0.007 179.1 444.7 265.655 0.01 179 446.7 267.760 0.01 177.5 446.9 269.465 0.005 176.2 444.8 268.670 0.01 178.5 445.6 267.175 0.007 178.3 447.7 269.480 0.009 177.2 446.6 269.485 0.007 174.2 446.6 272.490 0.01 176.9 445.5 268.695 0.007 179 446.1 267.1

100 0.007 177.6 444.7 267.1105 1.5138 3 443.9 440.9110 0.009 176.3 443.4 267.1115 0.002 174.4 440.8 266.4120 0.009 175.8 443.7 267.9

Trial 1 Using Capillary 3

Time (mins.)

pressure drop (Mpa) Heat Rejected (Kj/kg)Enthalpyinlet Enthalpy outlet

5 0.061 8.8 264.2 255.410 0.05 17.2 276.2 25915 0.009 14.1 286.5 272.420 0.01 165.8 430.7 264.925 0.009 167.6 432.5 264.930 0.007 171.5 433.4 261.935 0.03 173 431.2 258.240 0.04 171.6 431.3 259.745 0.047 171 431.4 260.450 0.014 170.8 436.4 265.655 0.005 172.4 437.3 264.960 0.012 170.8 437.1 266.365 0.019 171.7 436.6 264.970 0.019 172.2 439.3 267.175 0.035 175.3 438.7 263.480 0.028 176.7 439.3 262.685 0.045 175.4 438.8 263.490 0.043 176.4 437.6 261.295 0.04 175.2 438.6 263.4

100 0.048 179.1 438.1 259105 0.042 175.4 438.1 262.7110 0.041 176.3 439 262.7115 0.035 175.9 438.6 262.7120 0.036 177.5 439.4 261.9

Trial 2 using Capillary 1

Time (mins.)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.047 21.6 275.5 253.9

10 0.037 169.2 430.4 261.215 0.031 176.9 442.5 265.620 0.033 184.5 443.5 25925 0.028 174.4 436.3 261.930 0.027 179.8 438.1 258.335 0.024 178.7 438.4 259.740 0.021 182.1 439.7 257.645 0.026 182.9 441.2 258.350 0.014 183.3 440.1 256.855 0.026 183.3 440.9 257.660 0.024 183.6 441.9 258.365 0.026 183.6 440.5 256.970 0.017 186.8 440.7 253.975 0.019 184.3 439.7 255.480 0.024 186.5 441.2 254.785 0.012 186.5 441.9 255.490 0.019 186.8 440 253.295 0.022 186.6 439.8 253.2

100 0.022 187.5 440 252.5105 0.021 186.9 438.7 251.8110 0.022 186.2 437.3 251.1115 0.01 188.7 440.5 251.8120 0.021 184.5 438.5 254

Trial 2 using Capillary 2

Time (mins)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.047 13.4 272.4 259

10 0.003 23.5 281.7 258.215 0.007 167 426.7 259.720 0.012 169.4 430.6 261.225 0.012 171.8 432.2 260.430 0.017 173.7 433.4 259.735 0.009 172.9 433.3 260.440 0.009 175.6 433.8 258.245 0.012 172.1 432.6 260.550 0.034 173.3 433.7 260.455 0.035 175.9 434.1 258.260 0.042 175.9 434.1 258.265 0.038 176.5 434.8 258.370 0.042 176.4 433.9 257.575 0.038 176.4 433.9 257.580 0.04 174.1 431.6 257.585 0.041 177.3 434.1 256.890 0.043 176.4 433.2 256.895 0.031 177.3 436.3 259

100 0.033 176.1 435.1 259105 0.047 171 432.2 261.2110 0.033 184 438.6 254.6115 0.03 208.4 462.3 253.9120 0.042 178.4 432.3 253.9

Trial 2 using Capillary 3

Time (mins)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.073 16.2 271.6 255.4

10 0.057 29 287.2 258.215 0.008 169.2 429.6 260.420 0.005 171.7 435.8 264.125 0.01 171.7 433.6 261.930 0.014 170.1 436.4 266.335 0.01 171.5 436.3 264.840 0.007 172 438.3 266.345 0.017 177.9 438.3 260.450 0.012 173.4 436.7 263.355 0.007 175.4 438.7 263.360 0.012 175.2 439.3 264.165 0.04 176.6 439.2 262.670 0.04 175.2 437.8 262.675 0.037 176.3 437.5 261.280 0.045 175.8 438.4 262.685 0.038 177.7 438.9 261.290 0.048 178.5 438.9 260.495 0.047 176.9 438.1 261.2

100 0.045 178.5 439.7 261.2105 0.033 180.4 437.9 257.5110 0.043 178.2 438.6 260.4115 0.041 177.4 439.3 261.9120 0.031 177.3 437.7 260.4

Trial 3 Using Capillary 1

Time (mins.)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.028 12.7 271 258.3

10 0.105 16.7 278.6 261.915 0.01 168.1 435.2 267.120 0.007 170.7 437.1 266.425 0.021 175.6 438.3 262.730 0.024 173.9 438.1 264.235 0.03 172.3 435.7 263.440 0.024 175.2 437.2 26245 0.019 173.5 437 263.550 0.017 175.9 437.1 261.255 0.028 177.6 437.4 259.860 0.028 179 436.6 257.665 0.023 176.4 435.4 25970 0.022 176.3 435.3 25975 0.021 175.3 435.1 259.880 0.021 177.4 435 257.685 0.012 177.6 434.5 256.990 0.024 182.7 435.9 253.295 0.021 183.1 435.6 252.5

100 0.007 182.4 436.4 254105 0.01 179.1 436 256.9110 0.021 183 435.5 252.5115 0.012 182.1 435.3 253.2120 0.021 184.6 438.6 254

Trial 3 Using Capillary 2

Time (mins ) pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet

5 0.062 7.2 258.3 251.110 0.048 14 269.4 255.415 0.043 20.4 280.1 259.720 0.004 166.4 429 262.625 0.007 172.9 431.9 25930 0.009 169.7 433.8 264.135 0.01 171 436.6 265.640 0.009 172.9 437.8 264.945 0.009 172.3 437.9 265.650 0.009 173.4 439 265.655 0.007 174.3 439.9 265.660 0.01 175.5 440.4 264.965 0.009 177.7 440.3 262.670 0.01 174.2 442.1 267.975 0.01 175.6 443.5 267.980 0.009 177.2 444.3 267.185 0.012 178.6 442.7 264.190 0.012 176.9 442.5 265.695 0.007 178.1 444.4 266.3

100 0.007 176.4 442.7 266.3105 0.002 175.8 442.1 266.3110 0.002 177 441.1 264.1115 0.002 179 442.4 263.4120 0.033 182.4 438.5 256.1

Trial 3 using Capillary 3

Time (mins.)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.00433 2.2 420.5 418.3

10 0.04 31 452.9 421.915 0.00733 3.5 420.3 416.820 0.01266 7.1 252.5 245.425 0.02534 6.3 424.6 418.330 0.053 6.1 423.5 417.435 0.01267 176.9 423.2 246.340 0.014333333 174.4 424.1 249.745 0.015666667 20.3 271.2 250.950 0.011666667 9.9 431.1 421.255 0.046666667 8.8 425.8 41760 0.006666667 8.3 425.5 417.265 0.009666667 10.7 428.7 41870 0.015666667 174.2 422.7 248.575 0.009333333 10.9 432.6 421.780 0.016666667 180.2 424.2 24485 0.004666667 9.6 430.9 421.390 0.013 178 423.6 245.695 0.00366 11.5 435.9 424.4

100 0.00933 9.1 425.9 416.8105 0.00633 181.7 427.8 246.1110 0.01133 11.4 428.8 417.4115 0.002655 14.7 267.9 253.2120 0.748325 9.9 425.7 415.8

For Conventional Driven Compressor :Average Results for Trial 1 , Trial 2 and 3 for Capillary 1

Time (mins.)

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.01633 3.1 252.5 249.4

10 0.01667 1.9 253.2 251.315 0.016 3.6 255.9 252.320 0.01333 5.3 258.1 252.825 0.014 167.5 421.2 253.730 0.01233 170.4 423.4 25335 0.0133 173.8 424.7 250.940 0.01467 172.8 424.4 251.645 0.00967 174.7 425.3 250.650 0.0057 5 422.8 417.855 0.01267 175.9 426.3 250.460 0.034 174.6 423.8 249.265 0.012 179.1 426.8 247.770 0.00967 178.3 426.8 248.575 0.014 178.5 426.5 24880 0.01467 177.2 426.6 249.485 0.01166 177.5 426 248.590 0.00533 8.6 428.6 42095 0.01 179 426.7 247.7

100 0.00966 8.4 427.2 418.8105 0.00667 7.5 426.5 419110 0.015 179.9 426.2 246.3115 0.00866 179 425.3 246.3120 0.01033 8.7 425.2 416.5

Average Results for Trial 1 , Trial 2 and 3 for Capillary 2

Time (mins )

pressure drop (Mpa) Heat Rejected (Kj/kg) Enthalpy inlet Enthalpy outlet5 0.009 0.8 418.3 417.5

10 0.012 1.6 250.5 248.915 0.009 1.4 251.8 250.420 0.014 3.6 254 250.425 0.003 5.8 424.2 418.430 0.004 6.2 424.2 41835 0.015 169.4 422.7 253.340 0.015 172.8 423.9 251.145 0.045 8.6 254.7 246.150 0.004 5.5 426.7 421.255 0 6.7 427.9 421.260 0.004 10.8 429.3 418.565 0.016 170.9 423.4 252.570 0.021 173.2 422.8 249.675 0 6.4 428.4 42280 0.005 9.7 429.1 419.485 0.012 173 427.7 254.790 0.019 173.8 424.9 251.195 0.003 8.3 429.9 421.6

100 0.007 10.5 429.5 419105 0.014 170.6 427.5 256.9110 0.005 7.8 429 421.2115 0.004 11.2 430.4 419.2120 0.014 174.5 427 252.5

Average Results for Trial 1 , Trial 2 and 3 for Capillary 3

CONCLUSION

Based on the data being gathered the, inverter driven compressor gives higher heat transfer compared to conventional driven compressor. On the other hand, the main advantage of the inverter driven compressor is that its energy consumption is rapidly decreasing as the set temperature was being achieved and this is the main reason why inverter driven compressor is an energy saving. Proper installation of the devices/equipments on the system has a big impact to the results.

• Journal article, one author, accessed online• Wu, J., "Study on Performance and Dynamics of Inverter Controlled Rotary

Compressors" (2000). International Compressor Engineering Conference. Paper 1426.

• Journal article, four authors, accessed online• Chang, Wenruey; Shaut, Tsongse; Lin, Chiangho; and Lin, Kueitien,

"Implementation of Inverter-Driven Household Refrigerator/Freezer Using Hydrocarbon Isobutane for Refrigeration" (2008). International Refrigeration and Air Conditioning Conference. Paper 945

• Accessed online• http://en.wikipedia.org/wiki/Inverter_compressor• Lesson article, accessed from my device• Lesson 22, Condensers and Evaporators Version 1 ME, IIT Kharagpur.• Journal article, two authors, accessed online• T. Q. Qureshi; S. A. Tassou, “Investigation of the Effect of Inverters on the Power

Supply and the Performance of Variable Speed Refrigeration Systems” International Refrigeration and Air Conditioning Conference

References