1 / 22

Blue is better

COMPRESSOR TECNOLOGY FOR THE LOW GWP REFRIGERANTS. London - 26° April 2012 RAC question time. 1. Eng. Marco Caldara Frascold R&D laboratory manager. Blue is better. Introduction. 2. Blue is better. Refrigerants. HFO R407F CO2. Current activities. Compressor design.

percival-levy
Download Presentation

Blue is better

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. COMPRESSOR TECNOLOGY FOR THE LOW GWP REFRIGERANTS London - 26° April 2012 RAC question time 1 Eng. Marco Caldara Frascold R&D laboratory manager Blue is better

  2. Introduction 2 Blue is better

  3. Refrigerants • HFO • R407F • CO2 Current activities Compressor design • Design evaluation for drop-in allowance • Design evolution for performance increasing • Application envelope extensions Validating application • Suggest refrigerant choice • Hybrid system • Field test in different location for seasonal TEWI calculation purposes 3 Blue is better

  4. R&D case study R1234ze TESTING EXPERIENCE 4 Blue is better

  5. Summary • Testing routine instruction • Testing equipment and methods • Refrigerant properties databases • Results • Operations • Current state of test program • Design evolution • Selection software update 5 Blue is better

  6. Testing routine instruction TEST PLAN Measure compressor parts Assembling compressor Tightness test Oil charge Installing on test rig and evacuate for 12 h Test and record time + working condition Recover refrigerant and uninstall from test rig Taking oil sample for analysis Dismantle compressor Measure compressor part (500 h). 6 Each test result contributes to the entire project final result Blue is better

  7. Test equipment and methods TEST RIG: 300kW 7 Blue is better

  8. Test equipment and methods TEST RIG: 300kW • Built by ILK Dresden in 2004. • Test according to EN13771-1 • Two Coriolis mass flow meter • LP side, method D1 • HP side, method D2 • Oil separator • Power supply from stabilized grid • Four independent PID controllers • Pressure measurement uncertainty lower than 1% • Temperature measurement uncertainty lower than 0,3 K • Power measurement uncertainty lower than 1% • Water cooled condenser and subcooler • Performance uncertainty lower than 5% 8 Blue is better

  9. Test equipment and methods PERFORMANCE DATA PROCESSING STEP Placing testing point Expect limits Break-in time (24 h) Reproduce conditions Go outside limits Check results Use interpolation software Evaluate efficiency curve Create performance model 9 Blue is better

  10. Refrigerant databases REFRIGERANT PROPERTIES DATABASE: • NIST refprop 9.0 • ILK REFLIB for MS Excel 2.1 10 Blue is better

  11. Results – key points • Compressor performance • Performance test • Numeric simulation • Refrigerant comparison • Oil behavior • Compressor parts wearing 11 Blue is better

  12. Results – performance test 12 Blue is better

  13. Results – Numeric simulation 13 Blue is better

  14. Results – Refrigerant Comparison 14 Blue is better

  15. Results – Oil behavior EVALUATED OIL: • POE 68 cst • PAG 68 cst • POE 170 cst (screw) • POE 68 cst Oil level was regulated at half of the sight glass on compressor crankcase by an optical level switch. • LUBRICATION AT COLD START UP • SUDDEN PRESSURE DECREASE (FOAM) • FORCED LUBRICATION – PUMP DIFFERENTIAL PRESSURE • GAS TRAPPING WHEN DISCARDED 15 Blue is better

  16. Results – compressor parts wearing EVALUATED COMPONENTS: • PISTON AND PISTON RINGS • SHAFT • RODS • BUSHES • VALVE PLATE REEDS • LIGHT WEARING (NORMAL) • NO OVERHEATING SIGN ON VALVE REEDS AND ROTATING PARTS • ABSENCE OF DIRT OR PARTICLES 16 Blue is better

  17. Operations NEEDING ADDITIONAL CARE FOR: • LOADING – UNLOADING OF THE REFRIGERANT • FLAMMABILITY ISSUE: VENTILATION OF AREA • STOCK AND HANDLING • VACUUM OPERATION ? • No difference in loading operation, but lower pressure at given temperature • Same ambient condition • Same stock area and procedure • Additional vacuum time to sample oil after test 17 Blue is better

  18. Test program • 1° step: drop in of refrigerant in standard model • 2° step: Evaluated R134a model range • 3° step: HFO dedicated model to enhance favorable behavior • 4° step: field test running and confirmation test • 99% compatible with standard model (dedicated oil) • different performances requires technology adaption 18 Blue is better

  19. Design evolution • Motor optimized for HFO • New valve plate • Reduced clearances • Optimizedbore-strokeratio 19 Blue is better

  20. Design evolution • Different motor size tested to catch higher efficiency • different bore-stroke solutions will be evaluated in future. • New design of valve plate under evaluation • Thanks to lower power consumption motor efficiency improvement is possible and necessary • Shorter stroke compression helps with low density refrigerant in suction stage • Valve plate for higher specific volume 20 Blue is better

  21. Selection software update • Refrigerant model available • Compressor efficiencies available for tested models • Other models could be calculated having tested performaces with HFC and conversion tools • Models need confirmation test on oher sizes • Thanks to similarity with R134a conversion is plausible and tested to define accuracy • Performance calculation in progress. 21 Blue is better

  22. Thanks ! COMPRESSOR TECNOLOGY FOR THE LOW GWP REFRIGERANTS QUESTIONS? 22 Blue is better

More Related