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.
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Heat Release Curve
#1
Posted 19 November 2014 - 03:04 AM
#2
Posted 19 November 2014 - 04:48 AM
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...
#3
Posted 19 November 2014 - 05:56 AM
#4
Posted 19 November 2014 - 07:20 AM
farid.k,
By a process simulation software such as CHEMCAD...
#5
Posted 20 November 2014 - 02:27 AM
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.
#6
Posted 20 November 2014 - 02:47 AM
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)
#7
Posted 20 November 2014 - 08:27 AM
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.
#8
Posted 20 November 2014 - 10:00 AM
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?
#9
Posted 20 November 2014 - 10:41 AM Best Answer
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.
#10
Posted 20 November 2014 - 07:05 PM
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
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