NEWS

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NEWS

Air energy heat pump HVAC engineer essential conversion table

PubDate:2017-09-29Author:Jinlun CompanySources:HVAC knowledgeViews:4766

1 MW (MW) = 1000 KW (kW)


1 KW=1000 W


1 KW = 861 Kcal / h (large card) = 0.39 P (cold amount)


1 W = 1 J/s (joules per second)


0.1MPa=1kg/cm2=10m water column=100KPa


1 USTR (US cold tons) = 3024Kcal / h = 3517W (cold)


1 BTU (British thermal unit) = 0.252kcal / h = 1055J


1 BTU/H (British thermal unit / hour) = 0.252kcal / h


1 BTU/H (British heat unit/hour) = 0.2931W (cooling capacity)


1 MTU/H (thousands of thermal units per hour) = 0.2931 KW (cooling capacity)


1 HP (electricity) = 0.75KW (electric)


1 KW (electricity) = 1.34HP (electric)


1 RT (cooling capacity) = 3.517KW (cooling capacity)


1 KW (cooling) = 0.284RT = 860kcal / h = 3.412MBH (103 BTU / h)


1 P (cooling capacity) = 2200kcal / h = 2.56KW


1 kcal/h=1.163W


1 W=0.86kcal/h


F (Fahrenheit) = 9/5 ° C + 32


°C (degrees Celsius) = (F-32) 5/9


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


1 M3/H = 0.5886 CFM (cubic feet per minute)


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


1 GPM (gallons per minute) = 0.006308 l/s


1 l/s = 15.85 GPM (gallons per minute)


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


1 Pa=0.1mmH2O=0.0001mH2O


1 mH2O=104Pa=10kPa


Standard coal calorific value Hc=8.14*103W.h/kg


1 MJ (heat) = 0.334125 kg of standard coal


1 Nm3 (natural gas) = 1.2143kg standard coal


Knowledge that HVAC engineers have to know:


1kcal (large card): 1kg of water rises or drops 1°C under standard atmospheric pressure, and the amount of heat absorbed or released is 1 calorie.


The phase change heat of 1 kg of ice is 80 calories


1 kg of heat of vaporization is 539 kcal


4°C maximum water density


EER/COP/IPLV, the ratio of cooling capacity / heating capacity to input power. EER refers to the compressor, COP refers to the system, the weighted average of the energy efficiency of the IPLV under different loads.


IPLV=2.3% * A+41.5% * B + 46.1% * C+10.1% * D (weighted average)


Refrigeration common unit conversion table:


Pressure unit


2. Power, freezing tons

3.temperature

Note: 0°C is converted to Kelvin at 273.16, converted to Fahrenheit at 32F.0K is converted to Celsius - 273.15 ° C, converted to Fahrenheit -459.67F.