Parag Patil

10 Questions 20 Answers 0 Followers

Questions related from Parag Patil

How can we linearize e-NTU equation ?

Dear all, e-NTU equation can be written as follows: e = {1-exp[-NTU(1-CR)]} / {1-CR*exp[-NTU(1-CR)]}; To simplify above, we can write it as follows: e = 1-exp[C*(1-X)] / 1-X*exp[C*(1-X)] Can...

02 June 2021 6,252 3 View

What is the difference between PID-controller design based on retrend / detrend model ?

Dear all, I have a set of I/O data. I estimated a transfer function based ( command: tfest) on this data in MATLAB. (I removed the trend from the data before it: command: detrend). Can I...

25 October 2020 1,825 5 View

Large difference in pressure drop calculation for shell side of shell and tube heat exchanger by Kern and Bell Delaware method , which one to choose?

Dear all, I calculated pressure drop of a shell side of a shell and tube heat exchanger. Pressure drop by Kern method is very large as compared to Bell Delaware method. ( I also confirmed it , as...

09 May 2020 8,144 3 View

What are the popular pressure drop measurement techniques across utility side of the heat exchanger ?

Dear all, Can you please tell me the ways to measure differential pressures across utility sides of the heat exchangers. Unlike process side, the utility side pressure drops may not be...

19 April 2020 3,272 16 View

MATLAB script for PID controller based on set-point deviation?

Dear all, I have a code for a system simulation. I do simulate it in a MATLAB script. Now, I want to use the PI / PID controller ( Not from Simulink or Any tool-box). I want to write the code...

01 January 2020 6,826 3 View

How to vary thickness of surface unevenly in comsol geometry?

I have a tube with a fixed inside thickness. Now, I want to change thickness of some part of this tube to X mm and some part to Y mm. Rest of the part has no change. Moreover, the parts of...

30 March 2019 5,609 3 View

Are oscillations in COMSOL Water-Hammer example die down with respect to time ?

I recently saw an example of water-hammering effect example of COMSOL Multiphysics. The example shows that the sudden closing of a valve produces pressure-shock through out the pipe upstream to...

25 January 2019 8,983 3 View

Co-Simulating Aspen Plus / Hysys and CFD/COMSOL or FLUENT using CAPE-OPEN?

Dear all, I am trying to co-simulate a chemical process in two-different environment. One is Aspen Plus and another is an CFD based simulator. The process has different units to be simulated in...

28 March 2018 9,323 3 View

Adding noise in the streams in Aspen Dynamic Simulation ?

Happy New Year to all of you! I have a doubt as follows: I want to use the NOISE-BLOCK to add the white noise in the stream in the simulation. When I add the noise block, the simulation does...

01 January 2018 3,895 3 View

I am trying to simulate a heat recovery steam generator. However, I am facing the problem with its startup and shutdown. Can I get your comments?

1. The HRSG is vertical and has 13 heat exchangers. 2. The Problem I am facing are as follows: a. The control logics for Aspen Dynamics (I have put the controllers for levels of three drums...

28 December 2017 5,354 3 View