HVAC Kuwerengera Fomula

Ine, Kutentha:

Celsius (C) ndi Fahrenheit (F)

Fahrenheit = 32 + Celsius × 1.8

Celsius = (Fahrenheit -32) /1.8

Kelvin (K) ndi Celsius (C)

Kelvin (K) = Celsius (C) +273.15

II, Pressure kutembenuka:

Mpa, Kpa, pa, bar

1Mpa = 1000Kpa;

1Kpa = 1000 pa;

1Mpa=10bar;

1bar=0.1Mpa=100Kpa;

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

1bar = 14.5psi;

1psi = 6.895Kpa

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

1 Pa=0.1 mmH2O=0.0001 mH2O

1 mH2O=104 Pa=10 kPa

III, Kuthamanga kwa mphepo, kutembenuka kwa voliyumu

1CFM =1.699 M³/H=0.4719 l/s

1M³/H=0.5886CFM

1l/s=2.119CFM

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

IV, Kuzizira ndi mphamvu:

1KW = 1000 W

1KW = 861Kcal/h=0.39 P (kutha kwa kuzizira)

1W = 1 J/s

1USTR=3024Kcal/h=3517W (kutha kuzirala)

1BTU=0.252kcal/h=1055J

1BTU/H=0.252kcal/h

1BTU/H = 0.2931W (kuzizira)

1MTU/H=0.2931KW (kuzizira mphamvu)

1HP (magetsi) = 0.75KW (magetsi)

1KW (magetsi) = 1.34HP (magetsi)

1RT(kuzizira mphamvu)=3.517KW (kuzizira mphamvu)

1KW (kuzizira kokwanira）= 3.412MBH

1P (kuthekera kozizira）=2200kcal/h=2.56KW

1 kcal/h = 1.163W

V,Makometsedwe a mpweyaunsembe makulidwe ndi kuzirala mphamvu:

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, Refrigerant kuwerengera chilinganizo:

1, Kusankhidwa kwa valavu yowonjezera: toni yozizira + 1.25% chilolezo

2, Press mphamvu: 1P = 0.735kW

3, Refrigerant charge: Kuzirala mphamvu (KW) ÷3.516 x 0.58

4, madzi otaya mpweya ozizira: Kuzirala mphamvu (KW) ÷ kusiyana kutentha ÷1.163

5, Kuzizira madzi otaya mlingo wa madzi utakhazikika wononga makina: Kuzirala mphamvu (KW) × 0.86÷ kutentha kusiyana

6, Kuzirala kwa madzi otaya madzi amadzi utakhazikika wononga makinakuzirala capacityKW+ press power) × 0.86÷ kusiyana kwa kutentha

7, Kutentha kwamtengo wapatali QT=QS+QL

8, Kuzirala kwa mpweya: QT =0.24*∝*L*(h1-h2)

9, Kuzizira kwakukulu kwa mpweya: QS = Cp * ∝ * L * (T1-T2)

10, zobisika kutentha kwa mpweya kuzirala: QL = 600 * ∝ * L * (W1-W2)

11,Madzi ozizirakuchuluka:L/sV1= Q1/(4.187△T1)

12, Voliyumu yamadzi ozizira: 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, refrigeration dzuwa: EER= Refrigeration mphamvu (Mbtu/h)/mphamvu mowa (KW);COP= Refrigeration capacity (KW)/power use (KW)

14, magwiridwe antchito oziziritsa pang'ono: NPLV=1/(0.01/A+0.42/B+0.45/C+0.12/D)

15, katundu wathunthu panopa (gawo atatu):FLA=N/√3 UCOSφ

16, voliyumu ya mpweya watsopano: Lo = nV

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

18, Mphamvu ya fan:N1=L1*H1/(102*n1*n2)

19, Mphamvu ya mpope madzi: N2 = L2 * H2 * r/ (102 * n3 * n4)

20, m'mimba mwake chitoliro: D=√4*1000L2/(π*v)

21, Duct area: F=a*b*L1/(1000u)