Heating with a constant DT=10°C

[Julien]

Hi,

In the process I want to simulate, I'd like to integrate the fact that equipment (a pump) increases the temperature of the inlet fluid of 10°C. Is there a tool, a way to have a stream whom properties are equal to another stream except that the temperature is increase of 10°C?

Thank for your help

[Luca Finardi]

Hi Julien,

I think you could use the 'Specification' Object taking as Source the temperature of pump inlet stream, as Destination variable the pump Delta-T and setting in the Specification control panel Y = X +10.

Hope this helps.

Luca

[Julien]

I tried the "Specification" object with a simple heater where it is possible to select outlet temperature as destination variable. The specification object doesn't modify the temperature.
I added the file in this post

[Daniel Medeiros]

If you just want to increase the temperature of the outlet of a pump, you could use a heater after it and set the outlet temperature to be 10 C higher than its inlet.

[Luca Finardi]

Hello Julien,

to me your file with the Specification on the heater did work properly ... see attached.

I also included a pump where to achieve the DT=10'C I inserted an Adjust to control the pump efficiency to get an outlet DeltaT of 10'C, but it seems not very stable.
In such a case probably a more stable approach could be to add an heater on pump discharge as suggested by Daniel.

Luca

[Julien]

Thank for your help
In fact, my main objective is to simulate a closed loop with recycle and what Daniel proposed (outlet higher of 10°C) can not be done because the stream upstream might have its temperature change and so is the temperature. All the loop works except the heating of 10°C. I just want first to have your help on a simple problem before sending you the complete loop file.
In any case, specification+heater works on the file you send me so I have to find why it doesn't work on my file.

Julien

[Daniel Medeiros]

You can also use a script which runs after the pump is calculated, to increase the temperature of the outlet stream by 10 C directly.

Go to script manager, create a new script, link it with the Pump's Object Calculation Finished event and do this:

Outlet.Clear()
Outlet.Assign(Inlet)
Outlet.Fases["0"].SPMProperties.temperature += 10
Outlet.SpecType = 0
Outlet.Calculate(True, True)

It won't work if there's only a single compound because the temperature will be calculated as a result of a pressure-enthalpy flash.

Regards
Daniel