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Questions related from Parag Patil
As heat exchangers in the heat exchanger networks get fouled, the utility in the furnace has to increased to compensate the losses. Apart from it, the pumping cost must be increasing as deposited...
05 February 2024 575 3 View
Suppose we have a 1-2 pass heat exchanger. It's U =500 W/m2K. Now, lets say, we want to approximate it with 1-1 pass heat exchanger. Definitely, the value of U =500 W/m2K will become invalid for...
16 December 2023 3,139 4 View
Suppose we have a HEN with several multi-pass heat exchangers. However, due to some technical constraints all these exchangers are modelled simply using single pass equations. What will the...
12 May 2023 2,751 6 View
I want the following help in linear fashion: I have a vector: P(n)=[1,2,3,4,5,...,n] I have binary variables with length of P: y(1),y(2).....y(n). These variables, y(i) can only take 0 or 1. A...
21 August 2021 4,506 8 View
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 6,328 3 View
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 1,958 5 View
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 8,241 3 View
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 3,365 16 View
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 6,949 3 View
To calculate the shell side pressure drop of shell and tube heat exchanger based on Bell-Delaware method (and Flow stream analysis method), one needs the information of Baffle-Shell ID, Baffle...
14 December 2019 2,243 1 View
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 5,682 3 View
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 9,057 3 View
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 9,431 3 View
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 3,957 3 View
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 5,417 3 View
