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1、S.Watts 28/10/2023 page 1,Vapour Injection vs Liquid Injection for Red Ice Project,S.Watts 28/10/2023 page 2,LIQUID INJECTION VAPOUR INJECTION,lower discharge superheat,increase of condenser massflow,higher discharge temperaturehigher heating capacity,S.Watts 28/10/2023 page 3,Liquid Injection,Vapou
2、r Injection,Economizer HX extra space required EXV Solenoid valve NC Large rigid piping,brazed connections+thermal insulation Compressor:large flexible(!)pipe,ext.brazed/int.flanged connections,PWM solenoid valve NCcontrol+valve integrated(EBX)Small flexible steel pipe,screwed connector Compressor:t
3、hin flexible pipe,small screwed connector,HARDWARE COMPARISON,S.Watts 28/10/2023 page 4,VAPOUR/LIQUID INJECTION COMPARISON,no margin for suction superheat higher than 5Kstdd compressor cant be re-used!(motor resizing required,or scrollset downsizing;manifolding:only quadros could be converted in tri
4、os)economizer HXs duty:20%of condenser duty big constraint of implementation(pipes and injection holes),specifically on large scrollsnot critical because unit is operated only few days per year at this condition,S.Watts 28/10/2023 page 5,VAPOUR/LIQUID INJECTION COMPARISON,limited interest at-7/48 ra
5、ting point,where COP is critical,CONCLUSIONFor Red Ice(large scroll,90%manifolded)liquid injectionfeatures the best(service/added cost)ratioFor smaller sizes(unitary)the balance may be reversed,S.Watts 28/10/2023 page 6,Liquid Injection is to be used on Red Ice ProjectReasons Added cost on the unitH
6、ardware(HX,EXV+LSV,pipes,cp extra costfor EVI)Labor(brazing,insulation installation)ServiceMAP benefit:-25/65C achievable only with Liq.Inj.Heating capacity maintained at low evaporating temperaturesTime to marketLiq.Inj.on Performer already qualified in FRCC(Speerall LFZ)Lab equipment availability(
7、EVI1.5year project schedule),S.Watts 28/10/2023 page 7,Back-up,S.Watts 28/10/2023 page 8,LIQUID INJECTION,Low added cost/conventional MAP extension,up to very high PR(reliability and service)Suitable to maintain heating capacity at low evaporating temperature COP unchanged or slightly reduced,(DRY)VAPOUR INJECTION,Higher added cost Limited MAP extension Heating capacity increased COP increased,(WET)VAPOUR INJECTIONregulated on cp discharge superheat,PREMIUM PROPOSAL Largest MAP extension Capacity increaseCOP increase COMBINES ADVANTAGES OF BOTH TECHNOLOGIES SAME COST AS EVI,OR,RECOMMENDATION,
