Cikakken jerin dabarun lissafin firiji na kowa!

1. Juyowar zafin jiki

Fara tare da mafi sauƙin sauyin zafin zafin farko

Celsius (C) da Fahrenheit (F)

Fahrenheit = 32 + Celsius × 1.8

Celsius = (Fahrenheit -32)/1.8

Kelvin (K) da Celsius (C)

Yanayin Kelvin (K) = digiri Celsius (C) +273.15

02, juyawa matsin lamba

Mpa, Kpa, pa, bar

1Mpa = 1000Kpa;

1Kpa = 1000pa;

1Mpa = 10bar;

1bar = 0.1Mpa = 100Kpa;

1 matsin yanayi = 101.325Kpa = 1bar = 1kg;

bar, Kpa, PSI

1bar = 14.5psi;

1psi = 6.895Kpa;

mH2O ku

1 kg/cm2 = 105 = 10 mH2O = mashaya = 1 MPa

1 Pa = 0.1 mmH2O = 0.0001 mH2O

1 mH2O = 104 Pa = 10 kPa

03. Juyowar saurin iska da girma

1 CFM (cubic feet per minute)=1.699 M³/H=0.4719 l/s

1 M³/H=0.5886CFM (cubic feet/minute)

1 l/s=2.119CFM (cubic feet per minute)

1 fpm (ƙafa a minti ɗaya) = 0.3048 m/min = 0.00508 m/s

04. Yawan sanyaya da iko

1 KW = 1000 W

1 KW = 861Kcal/h (kcal) = 0.39 P (ƙarfin sanyaya)

1 W = 1 J/s (Barkwanci/daƙiƙi)

1 USTR (US sanyi ton) = 3024Kcal/h = 3517W (ƙarfin sanyaya)

1 BTU (Na’urar dumama ta Biritaniya) = 0.252kcal/h = 1055J

1 BTU/H (Na’urar dumamar yanayi ta Burtaniya/awa) = 0.252kcal/h

1 BTU/H (Na’urar dumama ta Burtaniya/awa) = 0.2931W (ƙarfin sanyaya)

1 MTU/H (dubban raka’a masu zafi na Burtaniya/awa) = 0.2931KW (ƙarfin sanyaya)

1 HP (wutar lantarki) = 0.75KW (wutar lantarki)

1 KW (wutar lantarki) = 1.34HP (wutar lantarki)

1 RT (ƙarfin sanyi) = 3.517KW (ƙarfin sanyi)

1 KW (ƙarfin sanyaya) = 3.412MBH (103 raƙuman wutar lantarki na Burtaniya/awa)

1 P (ƙarfin sanyaya) = 2200kcal/h = 2.56KW

1 kcal/h = 1.163W

05, dabarar lissafi mai sauƙi

1. Zaɓin bawul ɗin faɗaɗawa: ton mai sanyi + gefe 1.25%

2. Ikon dannawa: 1P = 0.735KW

3. Cajin firiji: ƙarfin sanyaya (KW) ÷ 3.516 × 0.58

4. Gudun ruwa na injin mai sanyaya iska: ƙarfin sanyaya (KW) difference bambancin zafin jiki ÷ 1.163

5. Ruwan ruwan sanyi na injin da aka sanyaya ruwa: ƙarfin sanyaya (KW) difference 0.86 difference bambancin zafin jiki

6. Sanyin kwararar ruwa na injin murƙushe mai sanyaya ruwa: (ƙarfin sanyaya KW + ƙarfin damfara) × 0.86 difference bambancin zafin jiki

06. Kaurin layi da karfin sanyaya jiki

Mm 1.5mm2 shine 12A-20A (2650 ~ 4500W)

Mm 2.5mm2 shine 20-25A (4500 ~ 5500W)

★ 4 mm2 is 25-32A (5500~7500W)

★ 6 mm2 is 32-40A (7500~8500W)