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Simon Neuner

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About Simon Neuner

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    simon.neun@yahoo.de

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  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 want to mesh the geometry with AcuConsole according to the picture below (4 different layers): The size in the x and y direction is several times larger than that in the z direction, lets say 1 m * 1 m * 0.003 m (x * y * z). I defined the absolute mesh size as 10 mm. Abviously, this leads to only one element per volume in z-direction. Now to my questions: Which is the best setting to get at least 3 elements per height in z direction in the entire volume of one part (i.e. via different Volume Mesh Attributes for different volumes or by appliying a value for the Surface Mesh Proximity Level)? Thanks in advance!
  3. Dear @acupro, thank you for your advice! F in the above equation denotes the view factor, i.e. a "geometric" quantity of how the front or rear surface of the solar panel is oriented towards the sky or ground. Can you specify which equation is used to describe thermal radiation in this case ( through the boundary conditions) or is taken into account in the overall energy equation? And is the surface temperature Trear/Tfront considered by the solver in my equation from above?
  4. 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!
  5. Thanks again @ydigit for the answer! I managed now to set up a thermal simulation on a PV panel. I have another two questions for setting up boundary conditions: 1.) Is there any difference in computation between setting the convecting heat flux to 0.00 W/m^2K or disabling the simple boundary conditions option for the corresponding surface? 2.) When I want to include radiative heat exchange between the surfaces of the different layers and the surroundings from my PV Panel. Am I right with activating the enclosure radiation option and defining an emissivity model for each particular surface? I read somewhere, that an emissivity model is only valid, when there is a fluid in the domain and in my simulation I will not define a fluid, like we discussed before. 3.) Is there any option to extract the cell reaching solar irradiance [W/m^2] in the postprocessor (Hyperview) Maybe @Rahul Ponginan could help me with this issue too.
  6. Thank you @ydigit for the answer! I managed to simulate a temperature distribution in a simple solid plate which is supposed to solar flux. I applied the following conditions to all external surfaces: However, I did not define as air as a material or "solid". Are these conditions still adequate to simulate the heat exchange (conduction, convection) with an ambient medium or do I have to model air especially? And should I have to model a cuboid with air as static fluid, does the program automatically recognize that where there is a solid, there can't be fluid, or do I have to define that specifically? Thanks in advance!
  7. Dear Experts, My objective is to make a thermal analysis of a photovoltaic panel like in the paper I have attached. This panel shall be exposed to a irradiance of 1000 W/m^2 (in negative z-Direction) for 60 seconds at an ambient temperature of 25°C. The target values are the cell reaching solar flux (solar irradiance) and the temperature at the solar cell. I work with Hypermesh 2019 and the AcuSolve user profile. My procedure was similar to the tutorial ACU-T 3201 (Greenhouse Daytime Simulation): I have already defined the problem description and auto solution strategy, model propoerties and solar radiation models, applied volume parameters and meshed the panel with 1 mm tetra-volume elements. When I run the Acu Solve Job Lauchner and open the results in Hyperview afterwards, no results are displayed. Now to my questions: Is it possible to run a simulation with Acusolve without fluid (only solids) in the system? How do I define contact conditions like free convection with the environment or conduction? Do I need an emissivity model like in ACU-T 3200? Do I need to determine surface groups? I have also attached the Hypermesh file so to give you an idea of my simulation model. Thanks in advance! I would be extremely grateful about a help. 2015_Temperature distribution of photovoltaic module based on finite element simulation_Zhou.pdf Validation_2015_Zhou.hm
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