# Heating Systems - Steam and Condensate Loads

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)

## Related Topics

### • Steam and Condensate

Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

## Related Documents

### Air Heating Systems

Air heating buildings - heat supply vs. air flow and temperature.

### Condensate Pipe Lines - Sizing

Flow and pressure loss in condensate return lines - SI Units.

### Condensation of Steam - Heat Transfer

Heat transfer when steam condensates.

### Heat Emission from Radiators and Heating Panels

The heat emission from a radiator or a heating panel depends on the temperature difference between the radiator and the surrounding air.

### Heat Loss from Buildings

Overall heat transfer loss from buildings - transmission, ventilation and infiltration.

### Heating Up Applications - Energy Required and Heat Transfer Rates

Energy required to heat up a substance.

### Insulated Steam Pipes - Condensate Generated

Heat loss from steam pipes generates condensate which must be drained from the system - imperial units.

### Sizing Steam Pipes (lb/h)

Steam is a compressible gas where the capacity of a pipe line depends on the size of the pipe and the steam pressure.

### Steam - Flow vs. kW Rating

Calculate steam flow rate vs. kW rating.

### Steam Heating Air

Calculate steam heated air systems.

### Steam Heating Processes - Load Calculating

Calculating the amount of steam in non-flow batch and continuous flow heating processes.

### Steam Heating Systems - Classifications

Steam systems carries heat through pipes from the boiler to consumers as heat exchangers, process equipment etc.

### Transmission Heat Loss through Building Elements

Heat loss through common building elements due to transmission, R-values and U-values - imperial and SI units.