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Found 9 results

  1. Dear Experts, I have a solar panel, which consists of different layers (solids). The panel is exposed to a irradiance of 800 W/m^2 from straight above: I have a question regarding the definition of the surfaces under Solar Radiation Surface (Default, Inward, Outward, Both Sides) for the case shown above. If I define all surfaces (side-, top & bottom surfaces and also surfaces between different layers) as DEFAULT, I get the following results in Hyperview for the solar flux: If I define all surfaces as BOTH SIDES, I get the following results in Hyperview for the solar flux: How can I decide which option is the right for my usecase to model the physics correctly. Furthermore, what exactly is designated with solar_heat_flux in Hyperview? Is it the radiation intensity or another quantity? And what are the "best" options for Solar Radiation Parameters for num.rays, num. diffuse sub rays, max. ray reflections, min.ray energy? Thanks in advance!
  2. Dear Experts, I am currrently carrying out thermal analysis in AcuConsole on a photovoltaic panel composed of five different layers (Glass cover, encapsulant, silicium cell, encapsulant, Backsheet). I want to consider thermal radiation on the front& back surface of my PV panel according to the following equations for the front and back surface, respectively: . I read in the AcuConsole training manual that calculation of radiation is only possible from surfaces of fluid mediums but I have no fluid in my simulation setup. Therefore my questions are: 1.) Is there any other possibility to implement radiation without a fluid volume (i.e. setting heat flux (boundary condition) to -100 W/m^2 on the corresponding surface)? 2.) The equations above are dependent on a value which has to be calculated by the processor (Trear and Tfront). Is it possible to formulate such boundary conditions that depend on values that will be calculated later by the processor (AcuSolve)? Thanks in advance!
  3. Having had to use the radiation model in Acuconsole, I want able to find any info on the 'enclosure model' for radiation. Is it the same as S2S model. Any info on the matter would be great. Thank you.
  4. Hi I am trying to perform a (transient) thermal analysis where a composite plate is subjected to radiation. The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough and reflects it. How would I model this? Is it possible to do a thermal simulation like this with hyperworks software, like optistruct or radioss? I already looked at the tutorials but they don't match my case. I also tried acusolve but here it is not possible either because radiation through glass cannot be simulated properly.
  5. Hi I am trying to perform a thermal analysis where a composite plate is subjected to radiation. The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough. How would I model this? I already did a test simulation which runs fine but it seems as if all the radiation is absorbed by the glass layer which of course is not what I want to achieve. Either the way I modelled the radiation is wrong or either my radiation coefficients are wrong, these are the ones I used: The radiation properties for glass: emissivity: 0.75 , specular transmissivity: 0.85 , diffuse transmissivity: 0 , specular reflectivity: 0.08 , diffuse reflectivity: 0 The radiation properties for aluminium: emissivity: 0.1 , specular transmissivity: 0 , diffuse transmissivity: 0 , specular reflectivity: 0.5 , diffuse reflectivity: 0.1 Any ideas or remarks?
  6. Hi, I am performing research for a thermal radiation CFD simulation. The simulation is the following: A plate is locally heated by a laserbeam. So my question is: would it be possible to only apply radiation on this single spot? How would I do this in AcuConsole? I have done a greenhouse simulation already with radiation heat but than the radiation hit the complete model. So is it possible to only locally apply radiation in a model? Thank you in advance Toon
  7. Hi I am trying to simulate the temperature of a piece of paper lying on a surface, both subject to a radiation source (so a thermal CFD analyis). I made a large cube where the bottom side is the floor and the upper side is the outlet. The 4 vertical sides are inlets with a very low inflow speed (0.01 m/s). The piece of paper (modelled as a solid with the correct properties of paper) is lying on the floor obviously. Radiation heat is hitting the surface and the paper from dead above. When I try to run the model I get the following error: ''Non-planar inlet boundary condition found <Inlet quad4 Fluid wedge6>'' so I suppose something is up with how I am trying to simulate this problem (multple inlets,...). I ran the exact same problem with only one inlet and it ran fine. The paper and floor got hot but the asymmetry of the inflow kinda ''contaminated'' the result. Any ideas on how I can solve this? I am also wondering is there is a better way of solving this problem (so maybe I should use a different model setup)? I am not really interested in the flow field itself, more about the temperatures and flow field due to the temperatures (I included buoyancy due to Boussinesq). Any help and advice is appreciated! Thanks in advance Toon
  8. Hello, i have a little question about the possibility of time scaling and the use of the radiation load collector. I used the factor 10 (1sec in simulation=10sec in real time) to speed up my thermal analysis with radioss. It works fine wenn i scale thermal conductivity and the heat transfer coefficent (for example convection) by the factor i used for speed up (10). Is this although possible for the radiation? Because i don't see any way to scale this value in correct way... With best regards Kintsch
  9. hello all, Warm greetings. I am stuck up with the problem combining both the use of a blower and radiation enclosure together. I have studied fan component tutorial and radiation enclosure tutorial separately . But when I tried to use both within a analysis it is giving "Run time error" message. Please suggest the possible solution. Regards, Tutulika
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