The purpose of thermal design is to control the temperature of all electronic components inside the product so that it does not exceed the maximum temperature specified by the standards and specifications under the working environment conditions. Thermal design is inseparable from logic design, structural design, etc. Putting thermal design at the end to do heat dissipation is not called thermal design, it is just a heat dissipation remedial measure, which is not conducive to the company's process and wastes company resources.

1. Establish the project

2. Understand the working environment of the equipment

(including indoor or outdoor, ambient temperature and noise requirements, etc.), determine the equipment size, configuration, total power consumption, thermosensitive devices and concentrated heating devices

3. Select thermal design method
In short, a complete thermal design process should include the determination of the system cooling solution, detailed analysis and design, prototype testing, etc. It is a closed-loop process that is repeated and verified multiple times.

3.1 Thermal calculation
Thermal calculation (system level): When the equipment is simple or the heat distribution in the system is uniform, thermal calculation can be performed directly;

3.2 Thermal simulation
Establish a simulation model, assign attributes and loads, set boundary conditions and control parameters for solution, divide the grid, solve, and display the results.

3.3 Thermal test or thermal simulation test
When improving the design, thermal test can be carried out directly;
In important designs, existing similar equipment can be used or similar equipment can be made to carry out thermal simulation test.

4. Thermal design results
In natural convection:
The position, size and opening ratio of the inlet and outlet mesh
If a radiator is required, the results of radiator optimization

For forced convection: Select the model, quantity, and installation location of the fan Determine the size, location, and opening rate of the air inlet and outlet mesh If a radiator is required, the result of radiator optimization Others: such as the design of the air guide plate, the arrangement of components, etc.

5. Prototype production and testing

Based on the design parameters, make samples and test and verify

6. Determine whether the design requirements can be met If the requirements are met

the design is completed , and mass production development and introduction will be carried out later according to the demand conditions; If the requirements are not met, return to step 3, reselect the design plan, and continue to execute.

Purpose of Leakage test

The liquid cooling plate is an important part of the night cooling system. Once a leak occurs, it will cause a serious accident. The night cooling plate must be 100% airtight before shipment to ensure the reliability of the night cooling plate in use.

At present, there are many airtight test methods, and the more commonly used ones are water immersion leak detection, pressure leak detection, and helium mass spectrometer leak detection. Each method has its scope of application and advantages and disadvantages. During the detection process, it is necessary to select the appropriate leak detection method and gas source according to the actual situation and requirements.

Leak detection by immersion method

After filling the liquid cooling plate with gas of a certain pressure, seal the inlet and outlet of the liquid cooling plate, immerse the entire plate in water, and observe with the naked eye whether there are bubbles overflowing from the surface of the liquid cooling plate to determine whether the liquid cooling plate is leaking.

Advantages:

1. Easy to operate, low equipment and production input costs,

2. Intuitive detection, can quickly and accurately find the leak point for repair

Disadvantages:

1. Manual judgment is required, there is a possibility of manual misjudgment

2. The product will be soaked in water, and water stains need to be removed