I could find a correlation for completely filled horizontal cylinder at the book chapter by Martynenko OG, Khramtsov PP. Chapter 4 - Natural convection in enclosures. In: Free-Convective Heat Transfer. Springer. pp. 279-343.
“In life, the truest guide is science” – Mustafa Kemal Atatürk
I didn't understand well enough your question but the model shall answer zero velocity condition. I model district heating piping network so there are conditions (at spring and summer) that the end-users do not consume heat so the water content in the end pipes becomes zero-velocity so my model...
I have a transient pipe model (internal flow of water inside the pipe) that can calculate the water temperature distribution through the pipe length over time (solving convection-diffusion equation with heat sink).
This pipe model considers the heat transfer (as loss from the water to the...
The main purpose is with the solution of transient water temperature profile through a pipe segment considering the thermal inertia by the insulation and ground. I simply solve the system of partial differential equations for all sections (water, insulation, and ground) simultaneously. As this...
Thank you IRstuff. But this reference is not enough to my question. I need to find this mutual thermal resistance between the cylindrical layers (i.e. between insulation and water). The aim here is to find the temperature of insulation (as well as steel and ground) so to consider the thermal...
Ref: Palsson, Halldor | Analysis of Numerical Methods for Simulating Temperature Dynamics in District Heating Pipes - please check pg. 62 at LINK (CLICK!)
INTRO: In this reference, the mutual thermal resistances between layers as water-insulation, ground-surrounding, and insulation-ground are...
In this task of mine, I need to develop a tool/software to carry out hydraulic analysis of a central heating network, formed with supply and return pipes so forming a multi-parallel loops in a closed circuit, as can be seen in the below picture.
Can anyone suggest me some references especially...
1) The surface temperature both at the water and air-side changes as to the heat loss (iteration carried out)
2) I didn't consider volume change for the sake of simplicity. I will result in Nusselt correlation to avoid the implicit surface temperature calculations at a later stage. My storage...
`Thank you for your time mates.
Sorry my mistake: I fixed my typo, so all previously given heat loss values are in W level, not kW.
Description of the system: This is a storage tank used in houses for domestic hot water circuit (also known as hot water tank at the building substation at...
Hi,
I try to model a sensible stratified storage tank by use of multi-node method (splitting tank into segments in 1D). At this stage, I am in focus on the heat loss from the storage tank (in fact from each of these segments).
So two case exists: (i) one idle period without charging or...
Thank you for your helps.
It will be rewarding to give the correction factor curve, its expression being the formulation that I did submit in my first post (but giving here as well).
They seem to have a characteristic of an exponential function for each curve (considering some coefficients...
I need to spend time to have the understanding for this curve/data fitting topic. It is a must to have a reliable model as according to your system/simulation. Thank you for your helps.
Regards.
“In life, the truest guide is science” – Mustafa Kemal Atatürk
Hello,
During my tasks in different disciplines, I am reaching some new performance measure as according to the topic studied. I already used multi-regression in some and, if that was not enough to fit my data, I used interpolation method 'The Vandermonde Method' and lately discovered the...
I already have a graph showing the effect of supply/return temperature (to/from a district heating system) on the heat production efficiency (at a cogeneration cycle), taken from the IEA Report - Annex X:
Interpreting the graph; while the heat demand (and other parameters) being same...
I will determine the material and its thickness in accordance with the heat loss from a real case building/house/room. Hence, with your words, what separates radiator from outdoor will be fulfilled with the correct material thickness of the inner chamber. Isn't this true?
Regards.
“In life...
