Huina helu HVAC

I, ka wela:

Celsius (C) a me Fahrenheit (F)

Fahrenheit = 32 + Celsius × 1.8

Celsius = (Fahrenheit -32) /1.8

Kelvin (K) a me Celsius (C)

Kelvin (K) = Celsius (C) +273.15

II.

Mpa, Kpa, pa

1Mpa=1000Kpa；

1Kpa=1000pa；

1Mpa=10bar;

1 bar=0.1Mpa=100Kpa;

1 ka lewa=101.325Kpa=1bar=1Kilogram；

1 bar=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、Ka makani makani, ka hoʻololi leo

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 、Ka hiki ke hoʻoluʻu a me ka mana:

1KW=1000 W

1KW=861Kcal/h=0.39 P (hiki i ka hoʻoluʻu)

1W= 1 J/s

1USTR=3024Kcal/h=3517W (hiki ke hoʻoluʻu)

1BTU=0.252kcal/h=1055J

1BTU/H=0.252kcal/h

1BTU/H=0.2931W (hiki ke hoʻoluʻu)

1MTU/H=0.2931KW（hiki hoʻoluʻu）

1HP (ka uila)=0.75KW (ka uila)

1KW (ka uila)=1.34HP (ka uila)

1RT(hiki hoʻoluʻu)=3.517KW (hiki hoʻoluʻu)

1KW（hiki hoʻoluʻu）=3.412MBH

1P（hiki hoʻoluʻu）=2200kcal/h=2.56KW

1kcal/h=1.163W

V、Ea eaka mānoanoa hoʻokomo a me ka hiki ke hoʻoluʻu:

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 、Hui helu helu refrigerant:

1 、 Ke koho ʻana i ka valve hoʻonui: tone anu + 1.25% haʻawina

2、Ka mana paʻi: 1P = 0.735kW

3、Ka uku o ka mea hoʻoheheʻe: Kaha hoʻoluʻu (KW) ÷3.516 x 0.58

4、Ke kahe wai o ka mea hoʻoluʻu ea: Hiki ke hoʻoluʻu (KW) ÷ ʻokoʻa wela ÷1.163

5、Ke kahe wai hooluolu o ka mīkini wiliwili hooluolu i ka wai: hiki ke hooluolu (KW) ×0.86÷ ka like ole o ka wela.

6、Ke kahe wai hooluu o ka mīkini wiliwili hoʻoluʻu waika mana hooluoluKW+ mana kaomi) ×0.86÷ ʻokoʻa wela

7、Waiwai hoʻomehana nui QT=QS+QL

8、Hoʻoluʻu ea: QT =0.24*∝*L*(h1-h2)

9, ʻO ka hoʻoluʻu ea wela nui: QS = Cp * ∝ * L * (T1-T2)

10 、Latent wela o ka hoʻoluʻu ea: QL=600*∝*L*(W1-W2)

11 、Wai hauleo nui：L/sV1= Q1/(4.187△T1)

12, Ka nui wai hooluolu: 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 、 Ka pono o ka pahu hau: EER = Ka hiki ke hoʻohāinu (Mbtu/h)/ka hoʻohana mana (KW);COP= Hiki i ka pahu hau (KW)/hoohana mana (KW)

14、Ka hana hoʻoluʻu haʻalulu hapa: NPLV=1/(0.01/A+0.42/B+0.45/C+0.12/D)

15 、Ka haawe piha o kēia manawa (ʻekolu māhele): FLA=N/√3 UCOSφ

16, Ka nui o ka ea hou: Lo=nV

17、Ealako leo:L=Qs/〔Cp*∝*(T1-T2)〕

18, Mana o ka peʻahi: N1=L1*H1/(102*n1*n2)

19、Ka mana o ka paila wai: N2= L2*H2*r/(102*n3*n4)

20, ʻO ke anawaena paipu: D=√4*1000L2/(π*v)

21 、Ala auwai: F=a*b*L1/(1000u)