Large scale high and low temperature alternating humidity test chamber

Professional Technical Description of Large High and Low Temperature Alternating Damp Heat Test Chamber

1、 Definition and core functions

Definition: A climate and environmental testing equipment with a large volume (usually several cubic meters to tens of cubic meters) that can comprehensively simulate high temperature, low temperature, and humidity (alternating) environments.

Core function: To achieve precise temperature cycling, humidity cycling, and constant temperature and humidity testing in large workspaces, used to evaluate the reliability, stability, and performance of complete machines, large components, or batch samples in complex environments.

2、 Core Systems and Technologies

1. Structural system

Library structure: adopting modular splicing design. The warehouse plate is a double-sided metal plate (SUS304 stainless steel or color steel plate), filled with high-density polyurethane foam in the middle, usually ≥ 100mm thick, to ensure structural strength and thermal insulation performance.

Sealing design: The door frame adopts high and low temperature resistant silicone rubber sealing strips, and is equipped with a clamping mechanism to ensure that high temperature and high humidity do not leak out, and low temperature does not frost.

Strengthening load-bearing capacity: The internal floor and structure are designed to be reinforced to support heavy samples.

Observation window: equipped with multi-layer hollow electric heating explosion-proof glass observation window to prevent condensation and frosting.

Test lead holes: Lead holes with sealed covers are reserved in the box for external power or signal access.

2. Refrigeration system

Refrigeration method: Mechanical compression refrigeration is the foundation for achieving a wide temperature range and rapid cooling.

Refrigeration cycle:

Cascade refrigeration: standard configuration, used to achieve low temperatures from -40 ℃ to -70 ℃. It consists of two independent refrigeration cycles, a high-temperature stage and a low-temperature stage, which exchange heat through a cascade heat exchanger.

Parallel connection of multiple compressors: Two or more compressors are used to form a parallel unit, which, together with an energy regulation system, automatically adjusts the refrigeration output according to the thermal load, improving energy efficiency, reliability, and lifespan.

Core components: semi enclosed/fully enclosed compressor, air-cooled or water-cooled condenser, finned evaporator, accumulator, gas-liquid separator, thermal expansion valve.

3. Heating system

Method: Nickel chromium alloy heating wires are used and arranged in groups within the air circulation duct.

Control: PID regulation is achieved through high-power solid-state relays to achieve precise and fast heating control.

4. Humidity system

Humidification method:

Steam humidification: the mainstream method. It is divided into electrode steam humidification (generating steam by heating water with electrodes) and electric steam humidification (generating steam by heating water with electric heating tubes). Provide a clean and controllable humidification source.

Dehumidification method:

Refrigeration and dehumidification: core dehumidification technology. By controlling the surface temperature of the dedicated dehumidification evaporator to be lower than the dew point temperature of the air inside the box, water vapor is condensed and discharged.

Special low-temperature and low humidity control: When low humidity needs to be achieved in low-temperature environments, a combination of refrigeration dehumidification and indoor air replacement technology is used.

5. Air circulation system

Composition: Composed of multiple long axis motors, centrifugal fans, and air ducts that have undergone aerodynamic calculations.

Airflow organization: Designed as an upward return or horizontal air supply mode, optimized through deflectors to ensure temperature and humidity uniformity throughout the entire large workspace.

6. Control system

Controller: Industrial grade programmable logic controller (PLC) and high-resolution touch screen (HMI).

Control algorithm: Adopt adaptive PID or fuzzy PID control algorithm to accurately compensate for the nonlinearity and large lag of temperature and humidity.

Programming function: Supports multi segment program editing and can set complex temperature and humidity profiles, including residency, cycling, and slope changes.

Data recording: Equipped with large capacity storage as standard, real-time recording of the entire process operation data and curves, supporting USB drive export and remote monitoring.

3、 Main technical parameters

1. Temperature parameters

Temperature range: e.g. -70 ℃~+150 ℃.

Temperature fluctuation: ≤± 0.5 ℃.

Temperature uniformity: ≤ 2.0 ℃.

Heating and cooling rate: 1 ℃~3 ℃/min (average rate, higher specifications can be customized).

2. Humidity parameters

Humidity range: 20%~98% RH (this range is temperature dependent and can usually be achieved within the range of+25 ℃~+85 ℃).

Humidity fluctuation: ± 2.5% RH.

Humidity uniformity: ≤+3% RH.

Heating and cooling rate: It should be specified as% RH/min, usually slower than temperature changes.

3. Structural parameters

Internal volume: customized, such as 8m?, 10m? , 16m? Wait.

Internal dimensions: width (W) x depth (D) x height (H).

Load bearing capacity: For example, ≥ 500 kg/m?.

4、 Performance and reliability analysis

1. Correlation of performance indicators

Temperature humidity coupling: The accuracy and range of humidity control are heavily dependent on temperature control performance. The refrigeration system is the core that connects temperature and humidity, responsible for both cooling and dehumidification.

Uniformity challenge: The larger the space, the exponentially increasing difficulty in ensuring temperature and humidity uniformity, which requires requirements for air duct design, fan pressure, and air volume.

2. Long term operational stability

Under alternating damp heat stress, the equipment needs to have the reliability of continuous operation for several months without interruption. The quality of core components, welding process of refrigeration pipelines, and environmental resistance of electrical components are key factors.

3. Load impact

The performance parameters need to specify the testing conditions (no-load/full load). The attenuation of temperature and humidity uniformity and fluctuation of high-performance equipment under full load thermal load samples should be controlled within the allowable range.

4. Security protection system

Electrical safety: overload, leakage, short circuit, grounding protection.

System safety: Compressor overpressure/overheating/overcurrent protection, heater dry burning protection, humidifier water shortage protection, studio overheating protection, independent temperature limiting protector.

Emergency safety: indoor emergency lighting, emergency pressure relief port, emergency door opening device inside and outside the door.

Control system for large high and low temperature alternating humidity test chamber:

1. The programmable high and low temperature alternating test machine adopts a temperature program control system composed of a German Siemens PLC program controller (*), a 5.7 "color LCD touch control screen, and software.

2. The control system adopts digital display, which can display and set test parameters, curves, time, working status of refrigeration compressor, blower motor, and heater, and also has PID control function.

3. It can achieve automatic operation of the experimental program and automatically combine the operation of subsystems such as refrigeration, heating, humidification, and dehumidification to ensure the control of the entire temperature and humidity system.

4. The temperature control instrument adopts imported touch screen, programmable microcomputer PID control SSR output operation, and fully imported large LCD color touch screen display

5. The controller operation interface is available in both Chinese and English, and the real-time operation curve chart can be displayed on the screen;

6. It has a capacity of 120 programs, 99 segments per group, and 999 steps per segment, with a maximum time setting of 99 hours and 59 minutes per segment;

7. Complies with testing standards such as GB/T2423.1-2001GB/T2423.2-2001GB/T2423.4-2001.

The prices of various testing equipment released are only symbolic display prices and cannot be used as actual Cheng delivery prices. The actual prices are subject to the quotation made by Aisili salespersons according to customer requirements

We must know your experimental requirements in order to provide a prepared quotation. Please reply; The experimental conditions for the equipment inquired by your company include: the size of the required equipment, high temperature, low temperature, whether there is humidity, whether the product to be tested needs to be tested with power on, if the product has a large heat source during the power on test, whether there are special requirements for the heating and cooling time, etc. Aisili can customize according to customer requirements. For more detailed information, please refer to the following orASLI Instrument is committed to the research and production of environmental and mechanical testing equipment. ASLI has a strong development team and has obtained multiple technical certifications such as CE, SGS, ASLI, ISO, TUV, recognized high-tech qualifications, and ASLI

Product requirements for Liaoning walk-in high and low temperature alternating humidity test chamberpurpose：

Product requirements for Liaoning walk-in high and low temperature alternating humidity test chamber(:)Also known as high and low temperature cycling test chamber,Applicable to aviationskyTesting equipment in the fields of electronics, electrical appliances, hardware, automotive, chemical, home appliances, scientific research, etc,High and low temperature cycling test chamberUsed to test and determine the parameters and performance of products and materials after temperature environment changes during alternating high temperature, low temperature, or constant testing.

Aisili Instrument is committed to providing optimized solutions to enhance customer product quality, promote the development of quality assurance in various industries in China, and establish its own industry leading positionxianStatus, and then squeeze into the market. moreHigh and low temperature cycling test chamberFor details, please: