The high and low temperature test chamber is a testing equipment used to simulate the performance of products in temperature environments. Its working principle is based on thermodynamic and physical principles, and precise temperature control is achieved through the collaborative work of multiple core systems.
The temperature control system is the core, which monitors the temperature inside the box in real time through temperature sensors and compares it with the preset value. If the temperature is lower than the set value, the system will activate the heating element (such as electric heating wire or electric heating module) to increase the temperature; If the temperature is higher than the set value, the refrigeration system will be driven to cool down. This closed-loop control mechanism ensures that the temperature inside the box remains stable within the target range.
The refrigeration system adopts compressor refrigeration technology, and the refrigerant circulates in components such as evaporator, condenser, and expansion valve. The refrigerant is compressed into high-temperature and high-pressure gas by the compressor, and after dissipating heat in the condenser, it becomes liquid. Then, it is throttled and depressurized by the expansion valve, and enters the evaporator to absorb heat, thereby reducing the temperature inside the box. For scenarios that require lower temperatures, cascade refrigeration technology is used to achieve low temperatures of -40 ℃ or even -70 ℃ through a two-stage or three-stage system connected in series.
The heating system converts electrical energy into thermal energy through electric heating elements, rapidly increasing the temperature inside the box. The heating speed and power can be adjusted according to demand to ensure efficient and uniform heating process.
The air circulation system consists of fans and air ducts. By forcing air flow, the heated or cooled air is evenly distributed to all corners of the box, avoiding local overheating or overcooling, and improving temperature uniformity and stability.
The control system, as the "brain", integrates PLC and PID algorithms to coordinate the work of various systems according to preset programs, achieving precise temperature control and automated operation. Users can set temperature curves, monitor the testing process, and obtain real-time data through the control panel.