Following high school physics, heat gained = heat lost, So, heat gained by cold medium = heat lost by hot medium (neglecting other small quantities), Thanks to you all, i really appreciate your help, Different Set Pressure In Heat Curve Of Htri, Process Design To Apply In Heat Exchanger, Error Analysis Of Log Mean Temperature Difference, This is not recommended for shared computers. Looking to make the design and manufacturing of your products more agile? Or is it completely irrelevant whether the hot fluid is flowing through the inner tube or outer tube?
But the error form assumed value and calculated value always 5-6% and not become smaller.
Norwegian University of Science and Technology. i need to find outlet temperature? LMTD is 14.06, di =16mm do=20mm, length of one tube=1.8 m; I also want to calculate the number of tubes required? In any heat exchanger, for example; in a double pipe heat exchanger,how do we decide whether the hot fluid should flow through inner tube or outer tube?.
This can be done by trial-and-error, or by using the so-called NTU method, which I believe you are supposed to use. However, I am unable to do sensitivity analysis, while varying number of stage, to relate stages variations on top product purity. This is the main variable that the software test against. Different oils can have different spec. Fallah,The heat duty can be calculated from the cold fluid since i got the mass flow rate and temperatures, now to achieve this and having a hot source with known temperature, what will be the outlet temperature and mass flow rate needed? Thanks the steady-state outlet temperatures after a jump in one/both of the inlet temperatures, the Efficiency-NTU method (or alternatively the P-NTU method) is suitable. I know this sounds like an undergraduate question but oh....i cant get my finger around it.
I'm not interested in the inertia and dynamic behaviour of the heat exchanger, so I would like to compute only the exit temperatures of the heat exchanger for different inlet temperatures of the hot and cold fluid. (measured in degrees Celsius or kelvin), and c is a constant called the specific heat, which is measured in joules per kilogram-degree Celsius, .
But from this iteration, the value of U become divergent.
How to calculate the effectiveness of a two fluid heat exchanger when one of the fluid is undergoing change of phase?
Considering for example a design hot fluid inlet temperature of 32°C and an outlet one of 12°C, and a cold fluid inlet temperature of 7°C with an outlet one of 11.7°C, how can I obtain outlet temperatures for both fluids changing inlet ones keeping fixed the geometry and the mass-flowrates ?
This method is very good when the mass flow rates are different... How can I calculate the mass flow rate for a heat exchanger? That has moved me a lot closer to solving. Promoting, selling, recruiting, coursework and thesis posting is forbidden. IMO, you are supposed to determine the outlet temps. I wanted to simulate a simple flow over an airfoil in Fluent- ANSYS, and was confused between which model to choose, can anyone tell the difference between them and which model is used in what type of simulation?
However, it is difficult to simulate directly because of its extremely complex geometry. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. I already have the answers but do not know what equations to use to get them. RE: Calculate Heat Exchanger Outlet Temperatures 25362 (Chemical) 18 Mar 03 05:12 I can refer you to the article in the ChE magazine of August 11, 1980 by K.S.N.Raju and Jagdish Chand, both of the Panjab University, named "Consider the plate heat exchanger".
Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Please let us know here why this post is inappropriate. Do you know the performance of the heat exchanger or heat transfer area? Some book indexes have the charts listed under NTU method. Heat transfer performance of rotary regenerative heat exchanger, Modelluntersuchungen des Wärmeaustausches und Strömungswiderstandes an den Heizflächen mit Diagonalflossen, Numerical investigation of a compact tube heat exchanger for hypersonic pre-cooled aero-engine.
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