Core Thermal and Design Theory
For electric vehicle components, preventing battery pack degradation and high-voltage failure requires absolute temperature regulation. The fundamental science driving the EV Component Test Chiller (-20℃～+100℃ 1&6) focuses on how heat swaps between liquid coolant and refrigerant. By utilizing a high-efficiency Danfoss/KAORI plate heat exchanger, the system monitors pressure variations and evaluates how the complete thermal network communicates under realistic driving conditions, spanning freezing sub-zero environments (-20℃) up to extreme heat (+100℃).
Because vehicle setups split cooling capacity between passenger comfort and battery stability, the testing models treat the chiller as one node of a heavily linked thermal web. The battery pack, motors, and inverters all interact constantly.
To test these interactions, the chiller utilizes a completely closed circulation system equipped with a dedicated 80L pressure vessel. By injecting a glycol aqueous solution, the setup completely blocks contact with outside air, preventing unwanted water condensation. Furthermore, a nitrogen-protected expansion tank safely broadens the temperature range of the heat transfer liquid, effectively eliminating oxidation and drastically extending the useful life of the testing fluid.
Primary Test Methods and System Flow
To gather highly accurate performance data, developmental engineering teams rely on this precision temperature control device to run specific physical tests across its 6-group multi-channel setup. The testing method follows a strict, systematic process flow:
- Evaporation and Heat Exchange: Liquid refrigerant (R404A/R507C) in the evaporator exchanges heat with the circulating air, transitioning from liquid to gas.
- Compression and Filtration: An Emerson Valley Wheel Compressor draws in the high-temperature, high-pressure gas, which then passes through a dedicated oil separator to remove machine oil.
- Condensation: The compressed gas enters the Shenshi tube-type condenser, exchanging heat with ambient air or cooling water, transforming back into a high-pressure liquid.
- Depressurization: After passing through a Danfoss dry filter, the refrigerant is throttled and depressurized by a Danfoss Thermal Expansion Valve, becoming a low-pressure liquid ready to repeat the cooling cycle.
Data Verification and System Modeling
Figuring out the mathematical formulas for EV thermal management involves extracting real data from the physical test bench. Engineers use the EV Component Test Chiller to track exactly how the liquid refrigerant changes phases. By utilizing the built-in Siemens S7-1200 PLC controller alongside Modbus RTU, RS485, and CAN communication buses, developers can stream real-time flow and pressure data directly to their computer models.
Extracting live bench data is absolutely vital because actual physical hardware rarely behaves like the idealized numbers printed in a standard supply catalog. Developers often run into unexpected physical limits, such as coupled pump-valve responses or pressure drops. By actively tweaking the flow rates (from 1 to 40 L/min), adjusting the liquid temperatures, and timing the expansion valves correctly on the test bench, automotive engineering teams can guarantee their final thermal designs conserve massive amounts of battery energy over time.
