# 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 c_{p}(t_{2}- t_{1})(2)

where

w= weight of material

c_{p}= specific heat of the heated material (Check Material Properties to find specific heat for materials)

t_{1}= initial temperature of the heated material

t_{2}= 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 c_{p}(t_{2}- t_{1}) /(L h)(3b)