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Butikskylsystem medkoldioxid som kldmedium

Sveriges Energi- & Kylcentrum

13 december 2006

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Projektvillkor

Projektet r beviljat medel fr perioden jan06 jul07 40/60 finansiering (fas 1: 50/50)

Total budget 4 997 tkr (1 999/2 998) (fas 1: 4 367/(2 183/ 2 183))

Mindre pengar i projektet och mer att motfinansiera!

Redovisning sker NU!

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Fortsttning p projektet?

?

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Overview

Objective Current Situation

Refrigeration Systems in IUC

The conditions in the IUC lab Working System NH3/CO2 Cascade

Results of NH3/CO2 Cascade System

Working System R404A DX system

Results of R404A DX System

Comparison of two systems NH3 Speed Compressor Test

Discussion and Conclusion

Transcritical CO2 components

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Objective

Installation, test, and investigation of Transcritical CO2system. (main part)

To test and investigate NH3/CO2 cascade and R404A DXrefrigeration system and then compare with transcritical CO2system in term of performance and cost

To test and investigate two different speed (on-off andfrequency speed) of both CO2 compressor and NH3compressor in NH3/CO2 cascade refrigeration system in term

of performance

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Currently Situation

Transcritical CO2 system installing

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Refrigeration Systems in IUCRefrigeration Systems in IUC

NH3/CO2 cascade refrigeration system

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Refrigeration Systems in IUCRefrigeration Systems in IUC

R404A Direct Expansion refrigeration system

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The Conditions in IUC Lab

Different Ambient Temperature (15, 20, 25, 30 C)

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Working System NH3/CO2 CascadeWorking System NH3/CO2 Cascade

Thermosyphon Arrangement

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The Result of NH3/CO2 Cascade System

T_Evap_Freezing(-32--33 C)

T_Evap_Medium (-8C)T_NH3_Evap (-10.5)

T_CO2_Cond (-8.5 C)Temperature Diff (2 C)

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The Result of NH3/CO2 Cascade System

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Th R lt f R404A DX t

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The Result of R404A DX system

Chiller No1 had no stable operation at 15, 20, 25 C of cooling water temperature

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NH3 Speed Compressor Test

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NH3 Speed Compressor Test

The conditions were still set the same as the pervious test.

4 hours for test in each ambient temperature

On-OFF control Frequency control

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Transcritical CO2 System

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Discharge 2nd stage

Discharge 1st stage Suction 2nd stage

Suction 1st stage

Dorin semi-hermetic compressor

- 2900 rpm of compressor speed

- 10.3 m3/h of swept volume

- resist against pressure of 100 barin suction and 163 bar in discharge

- Frequency control

Two stages CO2 compressor

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Transcritical CO2 System

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Internal Heat Exchanger

- Shell and tube heat exchanger

- stand pressure up to 200 bar

- 5 kW of capacity- Temperature drop 0.3 C

- Pressure drop 30 kPa or 0.3 bar

To expansionvalve

To suction

compressor

From gas cooler

From

accumulator

Transcritical CO2 System

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Danfoss Expansion Valve

- Pressure control

- Expansion

- ON / OFF

Maximum working pressure: PS 140 bar

Volume Flow = 0,6 4,6 [m3/h]

Hermetic sealed coupling

For further information: Contact Danfoss Industrial Refrigeration

ICMT

Transcritical CO2 System

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CO2 Inlet Water Outlet

Water Inlet

CO2 OutletSuper Max Heat Exchanger

- 27 kW of capacity

- 80 plates in heat exchanger

- 70 bar of design pressure

- 40 C of design temperature

- 4.8 m2 of Area

Cascade Condenser

Transcritical CO2 System

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CO2 liquid and vaporinlet

CO2 vaporoutlet

Suction Accumulator

- a pressure up to 200 bar

- around 3 liters

- separator CO2 vapor andliquid

1 mm of hole (remove oil from CO2)

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Thank You !Thank You !

Questions ?Questions ?