The Condensing Heatx model condenses steam to provide heat to a colder tube-side stream. The flow of steam required to raise the tube-side stream temperature to that specified is set.

What do you want to see?

Data Description

Equipment Properties

Data Description

Data		Unit		Description
Set	Item	Type	Native	Description
Equipment Properties	InletGiven			If checked (True) the outlet flow is set equal to the inlet flow. If not checked (False) the inlet flow is set equal to the outlet flow. The composition of the outlet is always set equal to the inlet composition.
	TubeOutTemp	Temperature	F	Tube outlet temperature.
	HeatLoss	Fraction or Percent	Fraction	Heat Loss as a fraction of the heat transferred from shell to tube.
	TubeDeltaP	Pressure Change	psi	Tube side change in pressure.
	ShellDeltaP	Pressure Change	psi	Shell side change in pressure.

Top of Page

Equipment Properties

Top of Page

Example of using equipment

Top of Page

Method&Equations

The Condensing Heatx model first sets the inlet and outlet flows. For the tube side, if the outlet flow is given the inlet stream is set equal to the outlet flow.
If there is no flow on the shell or tube side a warning message is issued and the model aborts.
The model next sets the tube side temperature to that specified and sets the shell and tube side outlet pressures as the inlet pressure plus any given pressure change.
The energy required to raise the tube side temperature to that specified is calculated from
Q = (Ft * (Htout - Htin)) / (1-fhl)
The required condensing steam flow is then calculated.
Fs = Q / (Hsin - Hsout)
where:
Q is the necessary heat transfer from shell to tube
Ft is the tube side flow
Htout is the tube side outlet specific enthalpy
Htin is the tube side inlet specific enthalpy
fhl is the heat loss fraction
Fs is the shell side flow
Hsin is the shell side inlet specific enthalpy
Hsout is the shell side outlet specific enthalpy

Top of Page

Warnings

Tube outlet temp is not feasible.

Tube outlet temp is out of range.