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,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,大綱,空調常用基本度量單位,乘冪符號,壓力及流量,溫度、熱、熱流率及功率,濃度,計算方程式之推導,空調常用基本度量單位,度量制度,英制,公制,SI,制,長度,ft,m,m,容積,Gal,L,L,質量,Lb,g,g,力(重量),Lb,g,N,溫度,K,熱量,BTU,Cal,J,時間,hr,hr,s,乘冪符號,乘冪,符號,説明,pico,p,10,-12,nano,n,10,-9,micro,u,10,-6,milli,m,10,-3,centi,c,10,-2,kilo,k,10,3,mega,M,10,6,giga,G,10,9,tera,T,10,12,peta,P,10,15,exa,E,10,18,溫度,度量制度,英制,公制,SI,制,絕對溫度,R,K,K,相對溫度,F,C,以大氣壓力下,純水之凍結點為基準。,各種溫度單位之比較,華氏,F,212,32,-460,朗氏,R,672,492,0,攝氏,C,100,0,-273,凱氏,K,373,273,0,SI,制,K,373,273,0,大氣壓下之純水沸騰點,大氣壓下之純水凍結點,絕對零度,溫度單位之換算,0,=0+273=273,K,=273K,100,=,100+273=373,K,=373K,32,F,=32+460=492,R,212,F,=212+460=672,R,100,=1001.8+32=212 F,0,=01.8+32=32,F,0,F,=(0-32),1.8=-17.8,100F,=,(,100-32,),1.8=37.8,90,F=,(,90-32,),1.8=32.2,流速,度量制度,英制,公制,SI,制,氣象條件,MPH,m /s,m /s,管路系統,FPM,m /s,m /s,流速單位之換算,MPH=mile per hour,1mile =1,609.3m,10MPH=10,1,609.3,3600=4.47m/s,FPM=feet per minute,1,000FPM=1,000,0.3048,60=5.08m/s,10m/s=10,0.3048,60=1,969FPM,流量,度量制度,英制,公制,SI,制,風系統,風機,CFM,CMM,m,3,/s,風管,CFM,CMH,L/s,水系統,水泵,GPM,CMM,L/s,水管,GPM,LPM,L/s,流量單位之換算,CFM,(,cubic feet per minute)=Ft,3,/min,CMM (cubic meter per minute)= m,3,/min,CMH (cubic meter per hour)= m,3,/hr,1CFM=1,35.3,60=1.7CMH,GPM,(,gallon per minute,),=Gallon/min,LPM,(,liter per minute,),=Liter/min,1GPM=3.785LPM=3.785,60=0.063L/s,1CMM=1,000LPM=264.2GPM,壓力,度量制度,英制,公制,SI,制,絕對壓力,psia,/,cm,2,A,bar,kPa,Pa,裱壓力,psig,/,cm,2,G,真空度,“,HG,HG,壓力容器,psi,/,cm,2,bar,風管系統,“,Aq,Aq,Pa,水管系統,WG,mWG,kPa,水柱之表示方式,WG=water g,au,ge,A q=aqua,WC=water column,H,2,O,Water,壓力單位之比較,英制,公制,SI,制,bar,絕對壓力,psia,裱壓力,psig,真空度,HG,絕對壓力,/,cm,2,A,裱壓力,/,cm,2,G,真空度,mmHG,156.7,28.9,14.7,0,142,14.2,0,-14.7,0,29.92,11.033,2.033,1.033,0,10,1,0,-1.033,0,760,10.82,1.994,1.013,0,大氣壓力,絕對真空,壓力單位之換算,psi,=pound per square inch,1,/,cm,2,=2.2,(,2.54,),2,=14.2,psi,1bar=100kPa,1,/,cm,2,=9.8,(,100,),2,=98,000 N/m,2=,98kPa=0.98 bar,1bar=1,0.98=1.02,/,cm,2,1mmHG=1Torr=13.6mmWG,1mWG=1,000,/,cm,2,=1,000,(,100,),2,=0.1,/,cm,2,1,/,cm,2,=10mWG,1WG=64.4Lb/ft,2,=64.4,(,12,),2,=0.44722222,psi,1psi=2.31WG,1atm=760mmHG=760,13.6,1,000=10.33 m WG,熱、熱流率及功率,度量制度,英制,公制,SI,制,熱,BTU,Cal,J,熱流率,BTUH,k Cal/hr,kW,RT,功率,HP,kW,kW,熱流率及功率單位之換算,1RT=12,000BTUH=3.5kW=3,024,kCal,/hr,1kCal=3.97BTU=4.186kJ,1BTU=252Cal=252,4.186=1,055J=1.055kJ,1W=1J/s=3.1412BTUH=860Cal/hr,1HP,(英制馬力),=746W,1HP,(公制馬力),=735W,MBH=1,000BTUH=1,000BTU/hr,M=1,000,MW=1,000kW,M=1,000,000,濃度,代號,説明,數值,%,percent,10,-2,ppm,part per million,10,-6,ppb,part per billion,10,-9,ppt,part per trillion,10,-12,計算方程式之推算,水側熱流率之計算,空氣側熱流率之計算,功率、流量及壓力之關係,加濕量之計算,水側熱流方程式之推導,q,s,kW=Q,m,kg/s,C kJ/,. ,T,4,純水之比熱為,4.186kJ/kg.,原式可簡化成:,q,s,kW=4.186,Q m,3,/s,Kg/m,3, ,T,4,純水之密度為,1000,/m,3,,,原式可簡化成:,q,s,kW=4186,Q m,3,/s,T,q,s,kW=4.186,Q L/s,T,空氣側熱流方程式之推導,顯熱量計算,q,s,kW=Q,m,kg/s,C k J/,. ,T,標準空氣之比熱為,1.005 k J/,. ,,原式可簡化成:,q,s,kW=Q m,3,/s,Kg/m,3, ,T,標準空氣之密度為,1.2Kg/m,3,,原式可簡化成:,q,s,kW=1.2,Q m,3,/s,T,空氣側熱流方程式之推導,B,縂熱量計算,q,t,kW=Q m,3,/s,Kg/m,3, ,h k J/,標準空氣之密度為,1.2Kg/m,3,,原式可簡化成:,q,s,kW=1.2,Q m,3,/s,h k J/,功率、流量及壓力之關係,W=J/s=,N.m/s,=N/m,2,m,3,/s=Pa,m,3,/s,kW=m,3,/s,kPa,水泵軸動力(功率),kW=(L/s,1,000),kPa=(L/s,kPa,),1,000,風車軸動力(功率),kW=m,3,/s,(Pa,1,000)=(m,3,/s,Pa),1,000,水泵軸動力方程式之推導,P c,【,k W,】=,Q,【,m,3,/s,】,Pt,【,kPa,】,(,HP,0,.,746,),=,(,G PM,3,.,785,1,000,60,),(,F t WG,3,.,28,9,.,8,),=,(,G PM,FtWG,),3,958,英制,: Pc,H P,=,kW =,(,LPM,1,000,60,),(,m WG,9,.,8,),=,(,LPM,mWG,),6,122,公制,: Pc,kW,=,kW =,(,L/s,1,000,),k Pa=,(,L/s,kPa),1,000,SI,制,: Pc,kW,=,Q,Pt,3,960,Q Pt,6,120,Q Pt,1,000,風車軸動力方程式之推導,P c,【,k W,】=,Q,【,m,3,/s,】,Pt,【,kPa,】,(,HP,0,.,746,),=,(,CF M,35,.,3,60,),(,”A q,123,.28,9,.,8,),=,(,CF M,“,A q,),6,346,英制,: Pc,H P,=,kW =,(,CMM,60,),(,m m A q,1,000,9,.8,),=,(,CMM,mmAq),6,122,公制,: Pc,kW,=,kW =m,3,/s,(,Pa,1,000,),=,(,m,3,/s,Pa),1,000,SI,制,:Pc,kW,=,Q Pt,6,350,Q Pt,6,120,Q Pt,1,000,
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