DBY Engineering screw compressor data .ppt
- 1. 1 Medium Screw compressor update December 2012
- 2. 2 Capacity comparison with Carrier D B- Carri er capaci ty com pari si on 0 100 200 300 400 500 600 700 800 900 1000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 uni t m odel Capaci t y- t on D B Carri er
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- 5. 5 5 Flooded ACX （ HP ） -R134a Chiller Objectives 1. High COP and get energy saving certificate 2. Competitive cost and high reliability Good News （ Features) 1. Have original ACXHP as design base 2. Have a prototype chiller Next Steps 1.Prototype chiller test and review 2. Modification and retest 3.Test result analysis and proposal confirm 4. Summarize and push to the market
- 6. 6 R134a Compressor Benchmarking 267 377 270 334 426 307 170 400 239 504 172 344 272 684 380 664 326 784 258 790 385 932 257 480 295 900 463 1038 560 336 1050 554 1131 640 1200 320 720 805 410 366 850 470 407 910 535 1000 615 508 1100 700 805 583 910 713 791 825 929 1089 1276 1523 98 160 137 137 186 227 468 413 193 359 471 611 0 200 400 600 800 1000 1200 1400 1600 (2236) (2233) (1230) (1218) (1215) (1222) (1212) (1210 (1227) Displacement (m3 /h)
- 7. 7 Larger diameter rotors Offset centers Larger motor frame Rotor profile Male Drive Repositioned VI port Rotor Grinding 13% -17% improvement in efficiency Now we have to do the same to the 127mm and possibly 110 mm Updates 192mm- 226mm compared with 127mm compressors
- 8. 8 Objectives Reliability improvement for air cooled compressors with liquid injection cooling Good News 1. Adjust liquid injection temp up to 85 deg C 2. Progress achieved after three times tests Next Steps 1. Re-adjust rotor housing and test 2. Design freeze Design finalized Rotor housing optimization Before After
- 9. 9 Objectives Efficiency improvement with optimized Vi and discharge flowing area Good News 1. 0.5% improvement achieved for 1227 R134a (Vi) 2. CFD shows potential improvement Next Steps 1. Test for all models with optimized Vi 2. Test with increased flowing area of stator OD 3. Design freeze Efficiency improvement for larger compressors with axial Vi optimization 0 0.5 1 1.5 2 2.5 3 0.1 0.15 0.2 0.25 0.3 0.35 Width of the crevice in stator (mm) Pressure drop (Bar) Relationship between pressure drop and the width of the crevice Polyfit curve Calculated
- 10. R&D of 300-400RT Large Tonnage Screw Compressor - 300/350/400RT semi-hermetic - R134a only - WC/AC application - No internal oil separator, w/ VI - up to 450RT with VI - VFD option Ph1 400RT - Prototype by June, 2013 Ph2 300 、 350RT - Prototype & Testing by Dec,2013 HCY R&D Projects