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Equivalencias
 
 

Contenido

Conversiones y Equivalencias:

  • Units of Heat and Energy
  • Units of Power
  • Volume - Flow Rates
  • Units of Weight and Pressure
  • Units of Weight
  • Units of Volume
  • Units of Area
  • Units of Length

Cooling Units

> Handy Formulas Every Engineer
   Should Know:

  • Water
  • Air
  • Electrical
  • Basic Fan Laws
  • Drive Calculations

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    EQUIVALENCIAS

 
 
 

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Cooling Units

COP = EER ÷ 3.413
COP = SEER × 0.9 ÷ 3.413
COP = 12 ÷ (3.413 × kW/ton)
 
kW/ton = 12 ÷ (COP × 3.413)
kW/ton = 12 ÷ EER
kW/ton = 12 ÷ (SEER × 0.9)
     
EER = COP × 3.413
EER = 12 ÷ kW/ton
EER = SEER × 0.9
 
SEER = COP × 3.413 ÷ 0.9
SEER = 12 ÷ (kW/ton × 0.9)
SEER = EER ÷ 0.9
 
 
Handy Formulas Every Engineer Should Know
 
WATER
TONS =
GPM × (EWT - LWT)
24
or... TONS =
500 x GPM x (EWT-LWT)
12000
PUMP BHP =
GPM x Total System Head (ft w.g.)
3960 x PUMP Effic
WATER PRESSURE DROP (Ft) = 2.31 x Psig
 
AIR
TOTAL COOLING LOAD (Btu/h) = 4.5 × CFM STANDARD AIR × (h1 - h2)
SENSIBLE COOLING LOAD (Btu/h) = 1.08 × CFM STANDARD AIR × (Tdb1 - Tdb2)
 
ELECTRICAL
PUMP KW =
GPM × Pressure drop (ft)
5311 × Eff pump × Eff motor
FAN HP =
CFM × Static pressure (")
6350 × Eff fan
 
BASIC FAN LAWS
CFM1/CFM2 = RPM1/RPM2    
SP1/SP2 = (RPM1/RPM2)² = (CFM1/CFM2)²
BHP1/BHP2 = (RPM1/RPM2)³ = (CFM1/CFM2)³
 
DRIVE CALCULATIONS
MOTOR RPM × MOTOR PULLEY PD = BLOWER RPM × BLOWER PULLEY PD
 
This information is provided for your convenience. We feel it's reliable, but errors can occur. We make no claims as to the accuracy of this information and do not warrant it for any use or purpose whatsoever. Always verify specification data in order to ensure its accuracy.
 
     
 
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