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,,CommonproblemsindesignofprimaryreturnairconditioningsystemsByWangMinyong,YangLijuanandTengLiangAbstractWitharetrofittedprojectexample,exploressomeconceptionerrorsandpossiblesevereconsequencesduringsystemdesign.Analysesseveralkeypointsinequipmentselection,andputsforwardsomesuggestions.Keywordsprimaryreturnairconditioningsystem,totalcoolingload,indoorcoolingload,anglescale,freshairrequrrement,theoreticalcondition,actualcondition,standardconditionZhongTianConstructionGroupCo.,Ltd.,Jinhua,ZhejiangProvince,China0,,,,,,,,,,,,1,,1.6m2,,4,2,3,2000m2,11031HV&AC2009395,,19773,,32100077()5#2704(0)13857995942E2mail:yklts@163.com:2008210220:20092012152,:27,65%,:20W/m2(),40W/m2,0.5/m2,20m3/(h):364.028kW,230.746kW,0.0548kg/s,0.0227kg/s11:00,182101W/m2,115137W/m233.1()()364.028kW()()230.746kW,0.0548kg/s()0.0227kg/s,6642kJ/kg(10165kJ/kg),,,,,,,,,,,,2,Q=G(hC-hL),,G3.2,,,2:364.028kW/(0.0548kg/s)=6642kJ/kg230.746kW/(0.0227kg/s)=10165kJ/kg,6642kJ/kgCL,,,,N,,,,,3.3G=Q/(hN-hO)=(W1000)/(dN-dO),,W,ON,,,,N1=6642kJ/kg,2=10165kJ/kg,6,1,33,6,OON,h=(64.34kJ/kg-54.273131HV&AC2009395kJ/kg)-(64.34kJ/kg-56.05kJ/kg)=1.78kJ/kg,Q=364.028kW-230.746kW=133.28kW,G=Q/(hN-hO)4,53.43.13.3,,,,,,,,,30%,42%,,3.5,592.32kW-417.55kW=174.77kW,81398kW,120kcal/h1):0.6/(kcal/h),722):200000m3/h,1/(m3/h),203):2COP4.7,1398kW1398kW/4.7=297kW,1398kW+297kW=1695kW,1.151949kW:L=(0.86m3/(kWh)1949kW)/5=335m3/h200/(m3/h),:335m3/h200/(m3/h)=6.74):,233,,,RK,34101.7,,m250,1.6m280,1.6m2,,180,59018030%,,4,,231HV&AC2009395,?,,,L(,6409.83kW417.55kW,2%,)66(1)(409.83kW,82266m3/h),,,,,,:,,,,,,,,,,,,4.1CL,Q=G(hC-hL)O,L,,,,19.7,7/12,13,7,,C,,O,NO,,,,,,7,,,,,,4.227,19.5,7/12C,,29.3,7331HV&AC2009395/12,,,,,,(,),,,,,,,,,,,,,,,,,55.1,5.2;5.3,,(),,5.4,,,,,,,382kW,364kW5%5.5,,,,(),,,,,,5.6,,,,(),5.7,,,,5.8,,,,,,,,,:[1]2.[M].2.:,1995[2].[M].:,2007[3].[M].:,1994431HV&AC2009395