喷气增焓与喷液技术对比.ppt

R E F R I G E R A T I O N A N D A I R C O N D I T I O N I N G CONFIDENTIAL S.Watts * page * Vapour Injection vs Liquid Injection for Red Ice Project S.Watts * page * 6 2’ 5b 4 4 6 LIQUID INJECTION VAPOUR INJECTION 6 1 2, 3 4 5 5b 5a 6 1 6 2, 2’ 4 5 5b 3 EXV lower discharge superheat increase of condenser massflow higher discharge temperature higher heating capacity S.Watts * page * Liquid Injection 6 1 2, 3 4 5 5b 5a 6 1 6 2, 2’ 4 5 5b 3 EXV Vapour Injection Economizer HX extra space required EXV Solenoid valve NC Large Φ rigid piping, brazed connections + thermal insulation Compressor: large flexible(!) pipe, ext. brazed/ int. flanged connections … PWM solenoid valve NC control + valve integrated (EBX) … Small Φ flexible steel pipe, screwed connector Compressor: thin flexible pipe, small screwed connector HARDWARE COMPARISON 1 component per compressor ! S.Watts * page * VAPOUR / LIQUID INJECTION COMPARISON Operating point HPSH380 -20/65/5/5 Vapour injection Liquid injection Dry (5K superheat) Wet Early Late T disch 130/135 °C (1) dry 85/90 °C tbd Heating capacity increase / stdd +40/+45% (2) dry +5/+10% tbd COPh increase +10/+15% = dry -5 / 0% (5) tbd Pabs increase +30/+35% (2) = dry +10/+15% tbd PecoHX /Pcd (%) +20/+25% (3) = dry - tbd Inj. piping diam.(mm) ~20mm (4) = dry ~5mm tbd no margin for suction superheat higher than 5K stdd compressor can’t be re-used ! (motor resizing required, or scrollset downsizing; manifolding: only quadros could be converted in trios) economizer HXs duty: ~20% of condenser duty big constraint of implementation (pipes and injection holes), specifically on large scrolls not critical because unit is operated only few days per year at this condition MAP benefit design benefit potential capacity benefit Capacity benefit COP benefit S.Watts * page * VAPOUR / LIQUID INJECTION COMPARISON Operating point HPSH380 -7/48/2/5 Vapour injection Liquid injection Dry (5K supe