dT = change in fluid temperature (oC)
If we know the heat transfer rate - the amount of steam can be calculated:
ms = P / he (4)
ms = mass of steam (kg/s)
P = calculated heat transfer (kW)
he = evaporation energy of the steam (kJ/kg)
The evaporation energy at different steam pressures can be found in the Steam Table with SI Units or in the Steam Table with Imperial Units.
A quantity of water is heated with steam of 5 bar (6 bar abs) from a temperature of 35 oC to 100 oC over a period of 20 minutes (1200 seconds). The mass of water is 50 kg and the specific heat of water is 4.19 kJ/kg.oC.
Heat transfer rate:
P = (50 kg) (4.19 kJ/kg oC) ((100 oC) - (35 oC)) / (1200 s)
= 11.35 kW
Amount of steam:
ms = (11.35 kW) / (2085 kJ/kg)
= 0.0055 kg/s
= 19.6 kg/h
Water flowing at a constant rate of 3 l/s is heated from 10 oC to 60 oC with steam at 8 bar (9 bar abs).
The heat flow rate can be expressed as:
P = (4.19 kJ/kg.oC) ((60 oC) - (10 oC)) (3 l/s) (1 kg/l)
= 628.5 kW
The steam flow rate can be expressed as:
ms = (628.5 kW) / (2030 kJ/kg)
= 0.31 kg/s
= 1115 kg/h
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An introduction to the basic design of steam heating systems.
Sizing of steam pipe lines - major and minor loss in steam distribution systems.
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