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
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.
