Accurate and fast thermal simulation can shorten product development cycles and reduce development costs. This paper systematically discusses the basic principles and methods of LED lighting products, thermal simulation, and gives a typical case of thermal simulation, thermal simulation for LED lighting products have important reference value.
I. Overview of thermal simulation of LED lighting products
1, numerical calculation method
Thermal simulation is a method for solving flow and heat transfer problems by numerical calculation. It is the third analysis method along with test (test) and theoretical analysis.
The numerical calculation is to treat the dependent variable value in a finite number of positions (mesh nodes) in the calculation domain as the basic unknown quantity, and provide a set of algebraic equations about these unknown quantities and solve them according to the governing equations (differential equations) to be solved. The algorithm of this set of equations, thus directly solving the method of governing equations on each mesh node.
The control equations that need to be solved for thermal simulation of electronic products mainly include mass conservation equations (continuity equations), momentum equations (motion differential equations), energy equations, and supplementary equations needed to solve turbulent NS equations.
2, thermal simulation software
In theory, all CFD (Computational Fluid Dynamics) software can be used as software for thermal simulation of electronic products. CFD software can be roughly divided into general CFD software, engineering CFD software and electronic heat dissipation special thermal simulation software.
In general, general-purpose CFD software (such as FLUENT) has high requirements on the user's professional knowledge and complicated software operation. The electronic cooling special software is a thermal simulation software specially developed for the heat dissipation design of electronic products. It has low requirements on the user CFD professional knowledge, and the operation is also simple, and provides a large number of common components for electronic cooling. The software mainly includes Flotherm and Icepak. Wait. The performance of the engineered CFD software is between the general CFD software and the dedicated software for electronic heat dissipation. It adopts an engineered operation interface, which is simple in operation and strong in computing power. For example, CFdesign and FloEFD can easily import CAD models, and some commonly used electronic cooling components have been added.
3, the characteristics of thermal simulation
The differences between thermal and thermal tests include:
(1) The thermal simulation does not require samples, so the feasibility of the product plan can be predicted in the early stage of product development;
(2) The thermal simulation boundary conditions are ideal conditions, such as accurate ambient temperature and ambient wind speed, etc., while the ambient temperature and wind speed of the thermal test are difficult to achieve precise control;
(3) Considering the speed and accuracy of the calculation, the thermal simulation model needs to simplify the actual model of the product.
The advantages of thermal simulation include:
(1) No need for samples, you can quickly optimize the program;
(2) It is possible to distinguish the heat transferred in different ways (convection and heat radiation), to facilitate intuitive heat flow analysis of the product and to specifically improve the heat dissipation design.
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