calculating steam flow
calculating steam flow
(OP)
Hi,
I have a vessel which is half-filled with water. They want to use steam to heat it up at a rate of 20 deg C per hour. How do I calculate the the steam flow in kg/hr for the required heat increase?
I have a vessel which is half-filled with water. They want to use steam to heat it up at a rate of 20 deg C per hour. How do I calculate the the steam flow in kg/hr for the required heat increase?





RE: calculating steam flow
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RE: calculating steam flow
RE: calculating steam flow
Once you have your first case done, you can always go back and give another try with some other conditions, if required ...
http://www.engineering-4e.com
RE: calculating steam flow
Q = m Cp delta T...once you calculate the energy required divide by the total enthalpy in the steam at the supply pressure...
RE: calculating steam flow
For the steam side, you do have one stream coming in and one coming out. Inlet steam conditions need to be specified. The outlet conditions will come out form the energy balance calculations - constraint that needs to be satisfied.
That should do it ...
http://www.engineering-4e.com
RE: calculating steam flow
Altenative approach is to consider the problem as heat flow or kW.
first determine kW required- Q = m Cp deltaT (deltaT is 20). This also neglects heat loss. a small allowance needs to be made for this and will be determined by tank dimensions, insulation etc. The heat will provide Joules input required divided by the time over which this is needed (1 Hour). Divide the Joules input by time (3600 seconds) will provide the average kW (kJ per second) flow required.
From given steam conditions determine the joules output for condensing 1 kg to the final water temperature required. This will provide a heat mass flow kJ per kg steam.
It is then a matter of dividing kW by kJ/kg to get kg/second of steam!
Mark Hutton
RE: calculating steam flow
That should do it ...
http://www.engineering-4e.com