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# Heating Systems - Steam and Condensate Loads

## Calculating steam and condensate loads in steam heated systems.

The two basic situations common when calculating steam and condensate loads in steam heated systems are

• heat transfer through areas
• heating up materials

### Heat Transfer through Areas

Heat transfer through areas can be expressed as:

Q = U A dt                              (1)

where

Q = quantity of heat transferred trough the area

A = heat transfer area

dt = temperature difference between the steam and the secondary heated fluid

### Heating up Materials

The heat needed to heat up materials can be expressed as:

Q = w cp (t2 - t1)                               (2)

where

w = weight of material

cp = specific heat of the heated material (Check Material Properties to find specific heat for materials)

t1 = initial temperature of the heated material

t2 = final temperature of the heated material

### Heat Rate

The heat rate is the heat transferred per unit of time.

#### Heat Transfer Rate through Areas

The formula for calculating the heat transfer rate for heat transfer through an area can be expressed as:

Q' = Q / (L h) = U A dt /(L h)                                  (3)

where

L = Latent heat of evaporated (condensation) steam (Check Steam Tables to find latent heat, SI or Imperial Units)

h = available time

#### Heat Transfer Rate when heating up Materials

The formula for calculating the heat transfer rate for heating up materials can be expressed as:

Q' = Q / (L h) = w cp (t2 - t1) /(L h)                                     (3b)

## Related Topics

• Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 30