HVAC Calculation Formula

Ini, Tembiricha:

Celsius (C) uye Fahrenheit (F)

Fahrenheit = 32 + Celsius × 1.8

Celsius = (Fahrenheit -32) /1.8

Kelvin (K) uye Celsius (C)

Kelvin (K) = Celsius (C) +273.15

II, Kushandurwa kwekumanikidzwa:

Mpa, Kpa, pa, bha

1Mpa=1000Kpa;

1Kpa=1000pa;

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, Mhepo kumhanya, vhoriyamu kutendeuka

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, Kutonhorera uye simba:

1KW=1000 W

1KW=861Kcal/h=0.39 P (kutonhora kwesimba)

1W= 1 J/s

1USTR=3024Kcal/h=3517W (inotonhorera)

1BTU=0.252kcal/h=1055J

1BTU/H=0.252kcal/h

1BTU/H=0.2931W (kutonhora simba)

1MTU/H=0.2931KW (kutonhora simba)

1HP (magetsi) = 0.75KW (magetsi)

1KW (magetsi) = 1.34HP (magetsi)

1RT(kutonhora simba)=3.517KW (kutonhora simba)

1KW (kutonhora simba）=3.412MBH

1P (kutonhora simba）=2200kcal/h=2.56KW

1kcal/h=1.163W

V,Air conditioningkuisa ukobvu uye kutonhora kugona:

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 Calculation formula:

1, Kusarudzwa kwevharuvhu yekuwedzera: toni inotonhora + 1.25% mvumo

2, Dhinda simba: 1P = 0.735kW

3, Refrigerant charge: Kutonhodza huwandu (KW) ÷3.516 x 0.58

4, Kuyerera kwemvura yemhepo inotonhorera: Kutonhodza huwandu (KW) ÷ musiyano wetembiricha ÷1.163

5, Kutonhora kuyerera kwemvura yemvura-yakatonhorera screw muchina: Kutonhodza huwandu (KW) × 0.86÷ tembiricha musiyano

6, Kutonhora kwemvura kuyerera mwero wemvura-yakatonhorera screw muchinakutonhora simbaKW+ kudzvanya simba) × 0.86÷ mutsauko wekushisa

7, Gross kudziyisa kukosha QT=QS+QL

8, Kutonhora kwemhepo: QT =0.24*∝*L*(h1-h2)

9, Yakakosha kupisa mhepo kutonhora: QS = Cp * ∝ * L * (T1-T2)

10, Latent kupisa kwemhepo kutonhora: QL = 600 * ∝ * L * (W1-W2)

11,Mvura inotonhoravolume:L/sV1= Q1/(4.187△T1)

12, Vhoriyamu yemvura inotonhorera: 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 kunyatsoshanda: EER= Refrigeration capacity (Mbtu/h)/simba rekushandisa (KW);COP= Refrigeration capacity (KW)/simba rekushandisa (KW)

14, Kutonhora kusingaite kuita basa: NPLV=1/(0.01/A+0.42/B+0.45/C+0.12/D)

15、Yakazara mutoro ikozvino (nhatu nhanho):FLA=N/√3 UCOSφ

16, Mhepo nyowani vhoriyamu: Lo = nV

17 Mheposupply vhoriyamu: L=Qs/〔Cp*∝*(T1-T2)〕

18, Simba refani:N1=L1*H1/(102*n1*n2)

19, Simba repombi yemvura: N2 = L2*H2*r/(102*n3*n4)

20, Iyo pombi dhayamita:D=√4*1000L2/(π*v)

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