9 replies to this topic

[farid.k]

can anyone share to me what is actually "heat release curve" and what is the input needed in order to generate the heat release curve using HTRI. sorry as i am very new to heat exchanger design.

[fallah]

farid.k,

 

As far as I know, heat release curve is a curve of the temperature vs enthalpy for each of two hot/cold streams and is needed to design/size the heat exchanger geometry...

[farid.k]

How to generate that?

[fallah]

farid.k,

 

By a process simulation software such as CHEMCAD...

[ahmadikh]

 farid k.,

 

Only thing that I can add is that heat curve is used to design a heat exchanger once you have phase change. You can generate a heat curve using a simulator software package such as HYSYS as Fallah said. This would be an input for the design of the exchanger (maybe to the Vendor) in which you specify the amount of heat release vs. mole/mass fraction and temperature and can be done in constant/variable pressure.

 

Best,

Milad

Edited by ahmadikh, 20 November 2014 - 02:34 AM.

[serra]

it depends, see

https://www.htri.net/xist.aspx

Xist integrates VMGThermo fluid physical property generator,

however you can transfer data via CAPE interface (included in many simulators such as Chemcad, VMG, Aspen etc.)

or you can create a .htri file with tabulated properties vs. temperature / pressure in the different zones of heat exchanger,

or input directly in HTRI interface the estimated properties,

(this is the way I adopt to input data from my tables)

[shan]

It is not that difficult to generate a heat release curve with a calculator if you have no process simulator available. 

1.  To divide the range of the stream inlet temperature and outlet temperature into several intervals depending on the requirement of release curve accuracy.

2.  To calculate the stream enthalpy at each temperature point. 

3.  To draw a curve with the temperature as the horizontal axis value and enthalpy differential as the vertical axis value to get the heat release curve.

[farid.k]

It is not that difficult to generate a heat release curve with a calculator if you have no process simulator available.
1. To divide the range of the stream inlet temperature and outlet temperature into several intervals depending on the requirement of release curve accuracy.
2. To calculate the stream enthalpy at each temperature point.
3. To draw a curve with the temperature as the horizontal axis value and enthalpy differential as the vertical axis value to get the heat release curve.

Dear shan,

How about if using hysys?

[shan]

For Hysys 8.6

 

1.  Select the Heater/Cooler that you want heat release curve

2.  Performance Tab>Plots

3.  X Variable = Temperature, Y Variable = Heat Flow

 

Your are done.

[Bobby Strain]

shan may be right. But you may need properties, too. When you have questions about HYSYS, visit AspenTech's support site. They almost always have an answer.

 

Bobby