Question

Intelligent vehicle control equipment All around the world, manufacturers are competing to produce autonomous or self-driving vehicles Autonomous Vehicles Ltd are trying to develop a system with sensors and artificial intelligence that can drive a car. Or if self-driving is not possible, to develop a system that can assist a human driver. The information from the sensors is sent to a high-performance processor chip which executes the artificial intelligence algorithms The system works fine when they test it in the company laboratory. The air temperature in the laboratory is about 20 °C. When they turn the system on, they find that the processor warms up and that after a while it reaches a steady temperature of about 45 °C. The temperature that is measured is that of a large metal heat sink, which is attached to the processor and which helps the heat to disperse into the air, and 45 CiS within the operating range of the processor But when the system is fitted in the vehicle, the processor is installed in a plastic case to protect the electronics. The air inside the case heats up, the heat cannot escape, so the processor overheats, and it can get damaged and stop working The project team is considering various ways of solving the problem. One suggestion is to allow air from the surroundings to enter the box, replacing the hotter air. This might be a passive system with holes to let the air in and out, or they might fit a small fan to blow air into the case. The amount of heat removed will depend on the airflow. The CPU includes a temperature sensor, and there is the possibility of turning the fan on or off it the processor temperature reaches particular values Your task is to model the system to better understand what is happening and what can be done about it. You need to model (a) the laboratory setup, (b) the existing setup in the plastic case, and (c) the proposed setup with air exchange. You will need some additional information: some of this you can find by research (including in data sheets for components), other information (such as the type of processor and the size of case) will be supplied to your group during the assignment. To explain your recommendation, you need to produce a report and give a presentation to the management of the company

How do we calculate Temperature inside Plastic container Please Help ?

Answer 1

To calculate the temperature inside the plastic container, we will use energy balance equation.

E_in - E_out + E_gen = E_stored

As mentioned in the question that when the processor is installed in the plastic case, heat can not escape the plastic case and as there is no input energy to the plastic case.

Therefore,

E_in = 0 kJ

E_out = 0 kJ

E_gen =(power rating of processor) x time of operation

E_stored = mxcpx(Tair,f -Tair,i)

so, power rating(in watts) x time of operation = m x cp x (Tair,f - Tair,i)

Tair,f will give the final temperature inside the plastic container.