Ifomula yokubala yeHVAC

Mna, Ubushushu:

iCelsius (C) kunye neFahrenheit (F)

Fahrenheit = 32 + Celsius × 1.8

iCelsius = (Fahrenheit -32) /1.8

UKelvin (K) noCelsius (C)

UKelvin (K) = ngokukaCelsius (C) +273.15

II, uguqulo loxinzelelo:

Mpa, Kpa, pa, bar

1Mpa=1000Kpa;

1Kpa=1000pa;

1Mpa=10bar

1bar=0.1Mpa=100Kpa;

1atmospher=101.325Kpa=1bar=1Kilogram;

Ibha eyi-1=14.5psi;

1psi=6.895Kpa;

1 kg/cm2=105=10 mH2O=1 ibha=0.1 MPa

1 Pa=0.1 mmH2O=0.0001 mH2O

1 mH2O=104 Pa=10 kPa

III, Isantya somoya, ukuguqulwa kwevolumu

1CFM =1.699 M³/H=0.4719 l/s

1M³/H=0.5886CFM

1l/s=2.119CFM

1FPM=0.3048 m/min=0.00508 m/s

IV, Umthamo wokupholisa kunye namandla:

1KW=1000 W

1KW=861Kcal/h=0.39 P (umthamo wokupholisa)

1W= 1 J/s

1USTR=3024Kcal/h=3517W (umthamo wokupholisa)

1BTU=0.252kcal/h=1055J

1BTU/H=0.252kcal/h

1BTU/H=0.2931W (umthamo wokupholisa)

1MTU/H=0.2931KW (umthamo wokupholisa)

1HP (umbane)=0.75KW (umbane)

1KW (umbane)=1.34HP(umbane)

1RT(umthamo wokupholisa)=3.517KW(umthamo wokupholisa)

1KW (umthamo wokupholisa）=3.412MBH

1P (umthamo wokupholisa）=2200kcal/h=2.56KW

1kcal/h=1.163W

V,Into yokufaka umoya endliniUbukhulu bofakelo kunye nomthamo wokupholisa:

1.5mm2=12A-20A(2650~4500W) 1P~2P

2.5mm2=20-25A(4500~5500W) 2P

4mm2=25-32A(5500~7500W) 2P~3P

6mm2=32-40A(7500~8500W) 3P~4P

VI, Ifomula yokubala efrijini:

1, Ukukhethwa kwevalve yokwandisa: itoni ebandayo + isibonelelo se-1.25%.

2、Amandla ocofa: 1P= 0.735kW

3、 Intlawulo yefriji: Umthamo wokupholisa (KW) ÷3.516 x 0.58

4, Ukuhamba kwamanzi kwisipholile somoya: Umthamo wokupholisa (KW) ÷ umahluko wobushushu ÷1.163

5, Ukupholisa izinga lokuhamba kwamanzi omatshini wokupholisa amanzi apholileyo: Umthamo wokupholisa (KW) × 0.86÷ umahluko wobushushu

6, Isantya sokuhamba kwamanzi okupholisa komatshini wokujija opholileyo wamanziukupholisa umthamoKW+ cinezela amandla) ×0.86÷ umahluko wobushushu

7, Ixabiso lokufudumeza elipheleleyo QT=QS+QL

8, Ukupholisa umoya:QT =0.24*∝*L*(h1-h2)

9, Ukupholisa ubushushu obubalulekileyo:QS=Cp*∝*L*(T1-T2)

10, Ubushushu obufihlakeleyo bokupholisa umoya:QL=600*∝*L*(W1-W2)

11,Amanzi abandayoumthamo:L/sV1= Q1/(4.187△T1)

12, Umthamo wamanzi okupholisa: L/sV2=Q2/(4.187△T2)=(3.516+KW/TR)TR，Q2=Q1+N=TR*3.516+KW/TR*TR=(3.516+KW/TR) *TR

13, Ukusebenza kakuhle kwefriji: EER= Umthamo wefriji (Mbtu / h) / ukusetyenziswa kwamandla (KW);COP= Umthamo wefriji (KW)/usetyenziso lwamandla (KW)

14, Ukusebenza komthwalo wokupholisa ngokuyinxenye:NPLV=1/(0.01/A+0.42/B+0.45/C+0.12/D)

15、Umthwalo opheleleyo wangoku (isigaba esithathu):FLA=N/√3 UCOSφ

16, Umthamo womoya omtsha: Lo=nV

17, Umoyaubonelelo umthamo:L=Qs/〔Cp*∝*(T1-T2)〕

18, Amandla efeni:N1=L1*H1/(102*n1*n2)

19, Amandla empompo yamanzi: N2= L2*H2*r/(102*n3*n4)

20, Idayamitha yombhobho: D=√4*1000L2/(π*v)

21, indawo yombhobho: F=a*b*L1/(1000u)