Maintaining Water Temperature

[cruckshank]

I have a combustion process, and have calculated the net enthalpy of my inlets and outlets. Some of the energy released by the combustion is used to heat a cooling stream, maintained at temperature 46degC.



I wish to calculate the power required to maintain this cooling stream temperature: I was thinking of integrating the specific heat capacity of the water, with respect to temperature, and multiplying by the mass flowrate of the cooling stream.



Would this give the power required to maintain the coolant stream at 46degC or am I incorrect? If so how can I calculate this power value.



Thanks.

 

[billy_joule]

I have a combustion process, and have calculated the net enthalpy of my inlets and outlets. Some of the energy released by the combustion is used to heat a cooling stream, maintained at temperature 46degC.

What does this mean? Is 46 deg the max outgoing temp? What is it's delta T?

I wish to calculate the power required to maintain this cooling stream temperature:

There must be temperature (or phase) change of the cooling stream, or there is no heat and therefore power transfer.

Power = mass flow rate * specific heat * delta T = m_dot cΔT = (kg/s)*(J/kg.K)*K = Watts

The general approach is to do a mass and energy balance on your system and find the required cooling water mass flow rate for a given ΔT (or the required ΔT for a gien mass flow)