Dear Javier,Please refer to the mathematical description of the PV cells modeled in TRNSYS (Volume 5, 'Mathematical Reference', section 5.2.5). Specifically, section 5.2.5.5. describes how the temperature of the cell is calculated. As a brief description, the temperature of the cell is the result of an energy balance on the photo voltaic cell. Assuming that the ratio between the transmittance-absorptance product to the overall heat transfer coefficient ( (tau -alpha) / U_L) is constant, the plate temperature is calculated using the result of this product at test conditions (Normal Operating Cell Temperature). For a more complete description of this model, I recommend that you look at 'Duffie and Beckman, Solar Engineering of Thermal Processes, John Wiley & Sons, 1991', section 23.3. You could modify Type94 and improve the afore mentioned assumption, by calculating the heat transfer coefficient from a rectangular plate under wind conditions. The same book, in section 3.15, gives different Nusselt number correlations for plates exposed to outside winds.
Please let me know if this helps or if you need additional information. Best regards, Diego javier mota wrote:
Halo; I am Javier Mota fron 3i-ingenieria, madridWe are using the phtovoltaitic models in TRNSYS to simulate photovoltaitic centrals. But we are asking ourselves, so I ask to anybody may help us, what is the model the panels work with in relation with the convection, to disipate heat. It would be posible that the place we will install the panels, a big central with tracking in two axis, would have important wind and maybe cold wind,...so the disipationl of heat would cause the panels got colder and as i have seen, with less temperature, more production of energy, OK? So what is the model in TRNSYS models to disipate heat, and how could I consider this phenomena.Thanks in advance _________________________________________________________________¿Estás pensando en cambiar de coche? Todas los modelos de serie y extras en MSN Motor. http://motor.msn.es/researchcentre/_______________________________________________ TRNSYS-users mailing list TRNSYS-users@engr.wisc.edu https://www.cae.wisc.edu/mailman/listinfo/trnsys-users