I-HVAC Calculation Formula

I, izinga lokushisa:

I-Celsius (C) ne-Fahrenheit (F)

Fahrenheit = 32 + Celsius × 1.8

I-Celsius = (Fahrenheit -32) /1.8

U-Kelvin (K) noCelsius (C)

Kelvin (K) = Celsius (C) +273.15

II, Ukuguqulwa kwengcindezi:

Mpa, Kpa, pa, bar

1Mpa=1000Kpa;

1Kpa=1000pa;

1Mpa=10bar;

1bar=0.1Mpa=100Kpa;

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

Ibha engu-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, Isivinini 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, Amandla okupholisa 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 (ugesi)=0.75KW (ugesi)

1KW (ugesi)=1.34HP(ugesi)

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

1KW (umthamo wokupholisa）=3.412MBH

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

1kcal/h=1.163W

V,Umshini ongenisa umoyaukushuba kokufakwa kanye namandla okupholisa:

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 yesiqandisi:

1, Ukukhethwa kwe-valve yokwandisa: ithani elibandayo + i-1.25% yesibonelelo

2, Amandla okucindezela: 1P= 0.735kW

3, Ishaja yesiqandisi: Umthamo wokupholisa (KW) ÷3.516 x 0.58

4, Ukugeleza kwamanzi kwesipholile somoya: Umthamo wokupholisa (KW) ÷ umehluko wokushisa ÷1.163

5, Ukupholisa izinga lokugeleza kwamanzi omshini wokupholisa amanzi opholile: Umthamo wokupholisa (KW) × 0.86÷ umehluko wokushisa

6, Ukupholisa izinga lokugeleza kwamanzi omshini wesikulufa opholile ngamanziukupholisa umthamoKW+ amandla okucindezela) ×0.86÷ umehluko wezinga lokushisa

7, Inani lokushisisa eliphelele QT=QS+QL

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

9, Ukupholisa komoya okushisa okubalulekile:QS=Cp*∝*L*(T1-T2)

10, Ukushisa okucashile kokupholisa komoya:QL=600*∝*L*(W1-W2)

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

12, Ivolumu yamanzi 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 kahle kwesiqandisi: EER= Umthamo wesiqandisi (Mbtu/h)/ukusetshenziswa kwamandla (KW);COP= Umthamo wesiqandisi (KW)/ukusetshenziswa kwamandla (KW)

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

15、Umthwalo ogcwele wamanje (isigaba sesithathu):FLA=N/√3 UCOSφ

16, Ivolumu yomoya omusha: Lo=nV

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

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

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

20, Ububanzi bepayipi: D=√4*1000L2/(π*v)

21, Indawo ye-Duct: F=a*b*L1/(1000u)