国立勤益科技大学冷冻空调与能源系

12(1)•4(39.2)8.33lbm/gal1.0kg/L62.4lbm/ft31000kg/m3SI32.2(lbmft/sec2)/lbf1.0(kgm/sec2)/N,gc32.2ft/sec29.81m/sec2,gSI3••1-110cm150cmkg8.98•1-1(2)kg8105cm/m10cm150cm10250/mgk1098825033622332....=×××××=⋅⋅=⋅⋅⋅==−ππρρρρρLdLAVmwrwr••m3/sec,CMM,CMH,L/min,ft3/sec,CFM,CFH,gpm&VAV=×4(3)•=/vVAVAVm/×=××=×=ρρ&&;(kg/sec,lbm/sec)•1-28.5ft3/seclbm/sec62.4lbm/ft3•1-2sec/lb4305sec/ft58ft/lb462m33m...=×==Vm&&ρ5(4)•1-3Pa9CFM8psf7psig6psia5GPM4CMM3FPM(fpm)2FPS(fps)1mile/hrmph6(5)•1-3N/m2Pa9ft3/minCFM8lbf/ft2psf7lbf/in.2,gagepsig6lbf/in.2,abspsia5gal/mingpm4m3/minCMM3ft/minfpm2ft/secfps17(6)•ccmggmKEKEvvv2=2==×2;(Joule/kg,ft-lbf/lbm)•cmgzgmPEPE==;(Joule/kg,ft-lbf/lbm)•m:,v:,z:,g:gc:8(7)•1-4945L/minJoule/kg•1-4kg/Joule403840012sec/m898702sec/m89870sec60minL1000mm0175250min/L945m0175250cm35sin10916250sin2502222322222......21.21.Nsec/mkg2224cm10m=×===××==×××−=−=⋅=×cmgvKEAVvbadA&oπθπ16cm10cm9cm359(8)•(1)(2)•(1)(2)•10(9)•=•()=gageatmabsPPP+=gagevaccumatmabsPPP−=11(10)760mmHg101325Pa=1.01325bar14.696psi29.92in.Hg10.3329mHO233.914ftHO2,1.033kg/cm2=2116.224psfmmHO2=mmAqf12(11)•(2000lbm)322432[USRT]12000144012000200120003024120003516RTlb24hrBTU/lbBTU/hrBTU/minBTU/hr10kcal3968BTUkcal/hrBTU/hr10kcal3968BTU4186kJ10kcalhr3600seckW(kJ/sec)mm..........=×=×===×==×××=∆∆mthif13(12)&&&&&&mmVVVvVvAVAVAVvAVv1211221122111222111222=⇔=⇔=⇔=⇔=ρρρρ(2)(kg/sec,lbm/sec)qwhhVVggzzghKEPEccmm−=−+−+−=++()()212212212∆∆∆;(kJ/kg,BTU/lbm)(1)14(13)q:()w:()∆hhh=−21:∆KEVVgmc=−22122:∆PEgzzgmc=−():21(3)()(q,)()(w,)&Q&W15(14)&&Qmq=×&&Wmw=×−+−+−×=−×ccgzzggVVhhmwqm)(2)()(12212212&&−+−+−×=−ccgzzggVVhhmWQ)(2)(12212212&&&(kW,BTU/hr);(kW,Hp)(4)&&()&()QmhhVvhh=×−=×−1211121()16(15)zhhmmWQ12Vz111222V=mw=mq17(16)•(idealgasperfectgas)•p,v,T,V,,mρpvRTpvRTpRTpRTpVmRTVmpRT===:(/),:,:,:(,:(/),,,::(,),:(),,,:N/m,lbftKR)kg/m,lbftmftkg,lb2f23m333moρρ(gasconstant)/R=Ru/M(Joule/kgK,ft-lbf/lbm)()universalgasconstantRu==⋅⋅831415453Joulekg-moleKft-lblb-moleR.fmo18(17)•M(kg/kg-mole,lbm/lbm-mole)Ma=28.966kg/kg-mole=28.966lbm/lbm-mole•∆∆∆hCTCtpp=⋅=⋅;(kJ/kg,BTU/lbm)19(18)•1-520kg/m3•1-532m/kg2051K)27320(287mN101325./Kkgm-N=+==×⋅TRpρ20(19)•1-678ft3/lbm•1-63m222fft/lb075150R)46068(3553ft/in144in/lb714.....Rlblb-ftmf=+×==×⋅ooTRpρ21(20)•1-7kg88225K)27324(297m750cm/kg0331m/N101325cm/kg)033130(32f22f....Kkgm-N=+××+==×⋅absabsTRVpm•1-730kgf/cm24oC20.75m322(21)•1-810kW?(Cp=1.0kJ/kg)500CMM20301atm5oCoCoC23(22)•1-8•min/L85287C5186401C1001500K)20273(287m/N1013252,1,1,1,1,....CkgkJLkgCkgkJminmKkgmN3=×××××+=⇒∆⋅⋅∆××=∆⋅⋅∆××=⇒∆××=∆×=×=∆⋅⋅⋅⇒=⋅⋅⋅⋅×oooo&&&&&&&&&&(23)•(p-t)-(p-v)-(p-h)(,MollierChart)-(T-s)ptpvphTs(vf(vg(hf(hg(sf(sg(p-t.................................potopoto.................................potopo...................................popo...........................................(SaturationState)25(24)•(drysaturaedstate)•(quality)xmmmxVLV=+≤≤()01•xvx,ux,hxsxvxvxvxfg=−⋅+⋅()1uxuxuxfg=−⋅+⋅()1hxhxhxfg=−⋅+⋅()1sxsxsxfg=−⋅+⋅()1