The Climate Simulation Capability of Temperature Humidity Controlled Chamber — An Analysis Based on LISUN GDJS-015B High and Low Temperature Humidity Alternating Test Chamber

Abstract:
As the core functional unit of the high and low temperature humidity alternating test chamber, the temperature humidity controlled chamber is the key to achieving accurate simulation of natural climatic conditions. Taking LISUN GDJS-015B high and low temperature humidity alternating test chamber as the research object, this paper analyzes the structural design, technical principle and performance parameters of its temperature humidity controlled chamber, discusses the device’s ability to simulate various climatic conditions such as low temperature resistance, high temperature heat resistance, humidity aging and dry-wet alternation, and verifies the core value of the temperature humidity controlled chamber in the environmental adaptability verification of industrial products by combining practical application standards and industry demands. The research shows that the temperature humidity controlled chamber of GDJS-015B can reproduce a variety of extreme natural climates by virtue of wide-range temperature and humidity regulation, high-precision control and a stable circulation system, providing a scientific environmental simulation scheme for the reliability testing of products in LED lighting, electronic and electrical appliances and other industries.

1. Introduction
In the R&D and quality inspection of industrial products, the environmental adaptability and reliability of products directly determine their practical use value, and the dynamic changes of temperature and humidity in the natural climate are the core factors affecting product performance. As the core component of the high and low temperature humidity alternating test chamber, the temperature humidity controlled chamber realizes the accurate simulation and reproduction of natural climatic conditions through artificial regulation, which can accelerate the assessment of the performance stability of products under extreme or cyclic climates, and has become a key equipment for the R&D verification, production quality inspection and compliance certification of industrial products.

LISUN GDJS-015B high and low temperature humidity alternating test chamber is specially developed for the environmental adaptability testing of materials and products. Its temperature humidity controlled chamber integrates imported sensing technology, dual-core control system and multiple safety protection designs, which can realize the simulation of multiple climatic scenarios such as low temperature resistance, high temperature heat resistance, humidity aging and dry-wet alternation, and accurately match the core testing needs of LED lighting, electronic and electrical appliances, components and other industries. This paper focuses on the temperature humidity controlled chamber of the device, and systematically expounds its structural design, performance parameters and climate simulation capability, providing a reference for the application of environmental testing equipment in related industries.

2. Structural and Technical Design of LISUN GDJS-015B Temperature Humidity Controlled Chamber
The design of the temperature humidity controlled chamber directly determines the climate simulation accuracy and stability of the test chamber. LISUN GDJS-015B has optimized the temperature humidity controlled chamber from multiple dimensions such as material, sensing, control and circulation, creating a temperature humidity controlled chamber with corrosion resistance, high precision and high stability, laying a hardware foundation for climate simulation.

2.1 Main Material and Sealing Design
The inner liner of the temperature humidity controlled chamber is made of SUS304 stainless steel, which has excellent corrosion resistance and easy cleaning characteristics, and can be adapted to the long-term humid and heat test environment, avoiding the impact of inner liner aging caused by temperature and humidity alternation on test accuracy; the thermal insulation layer adopts a composite structure of “polyurethane rigid foam + superfine glass fiber” to achieve efficient temperature and humidity barrier and reduce energy exchange between indoor and outdoor; the door frame is equipped with a high-temperature aging silicone rubber sealing strip, which fundamentally prevents temperature and humidity leakage and ensures the stability of the temperature and humidity environment inside the controlled chamber.

2.2 Sensing and Control System
The precise regulation of the temperature humidity controlled chamber relies on high-precision sensing equipment and an intelligent control system. The device is equipped with a Finnish Vaisala humidity sensor, which has higher precision than the traditional dry and wet bulb sensor and does not require regular maintenance. Combined with an automatic purified water supply system, it realizes the accurate detection and stable regulation of humidity; the temperature detection adopts a platinum resistance PT100Ω/MV temperature sensor, which has the characteristics of high precision and anti-interference, and can capture the temperature changes inside the controlled chamber in real time.

The control system adopts an independent research and development temperature control instrument + PLC dual-core design, supporting Chinese and English operation, and is equipped with USB/RS-232/RS-485 interfaces, which can connect to a computer to realize remote monitoring and traceability of temperature and humidity data, ensuring that the temperature and humidity parameters during the test process are recordable and analyzable, and meeting the standardized requirements of industrial testing.

2.3 Temperature and Humidity Regulation and Circulation System
The heating system adopts an independent nickel-chromium alloy electric heater with high heating efficiency, uniform heat generation and no local overheating. Combined with the temperature control system, it realizes the precise temperature rise inside the controlled chamber; the refrigeration system is a fully enclosed air-cooled single-stage compression structure, equipped with a French TECUMSEH original compressor, which can realize rapid and stable cooling with convenient global after-sales service to ensure the long-term operation of the device.

The circulation system is equipped with a temperature-resistant and low-noise air-conditioning type motor (≤65dB) and a multi-blade centrifugal wind wheel. Forced convection is used to realize the uniform distribution of temperature and humidity inside the controlled chamber, avoid temperature and humidity gradients, ensure that all parts of the test sample are subject to the same environmental effect, and improve the scientificity of the test results. At the same time, the device integrates multiple protection systems such as electric leakage, short circuit, heating tube overheating, and compressor overpressure/overload/overcurrent, which ensures the safety of the controlled chamber and test samples while guaranteeing the accuracy of temperature and humidity regulation.

GDJS-015B Temperature Humidity Chamber | Thermal Chamber

3. Performance Parameters and Climate Simulation Capability of LISUN GDJS-015B Temperature Humidity Controlled Chamber
With a wide range of temperature and humidity regulation, high-precision control indicators and stable temperature and humidity change rate, the temperature humidity controlled chamber of LISUN GDJS-015B can realize the accurate simulation of a variety of natural climatic conditions. Its core performance parameters directly determine the coverage and accuracy of climate simulation, and the specific parameters are shown in Table 1.
Table 1 Core Performance Parameters of LISUN GDJS-015B Temperature Humidity Controlled Chamber

Based on the above performance parameters, the temperature humidity controlled chamber can simulate four major types of natural climatic conditions: low temperature, high temperature, constant temperature and humidity, and humidity alternation, covering the climatic characteristics and extreme environments of most regions on the earth, and meeting the testing needs of different industries.

3.1 Low Temperature Climate Simulation
The temperature regulation range of the temperature humidity controlled chamber is as low as -70℃, which can simulate the low temperature environment in high-latitude areas, polar regions or high altitudes. The temperature fluctuation is controlled within ±0.5℃ and the uniformity is ±2℃, which can accurately assess the performance changes of products in ultra-low temperature environments. For example, electronic components are prone to problems such as resistance value changes and signal transmission delays in low temperature environments, and LED lamps may experience a decline in lumen maintenance rate and start-up failures. By simulating a low temperature environment of -40℃~-70℃ in the temperature humidity controlled chamber, product design defects can be found in advance and the low temperature resistance of products can be optimized.

3.2 High Temperature Climate Simulation
The controlled chamber can realize the simulation of a high temperature environment up to 150℃, with a temperature rise rate of 1.0℃~3.0℃/min, which can quickly reproduce extreme high temperature conditions such as tropical regions and high-temperature industrial environments. For products such as LED lamps and automotive electronics, high temperature environments are prone to material aging, component deformation and performance attenuation. By simulating a high temperature environment of 80℃~150℃ in the controlled chamber, the product aging process can be accelerated, the high temperature resistant service life of the product can be quickly evaluated, and a basis can be provided for product material selection and structural design.

3.3 Constant Temperature and Humidity Climate Simulation
The humidity regulation range of the controlled chamber is 20%~98%RH, with a humidity deviation of only -2%~-3%RH, which can realize the simulation of a constant temperature and humidity environment with any combination of temperature and humidity, covering a variety of humidity conditions such as dry, normal and high humidity. For example, simulating the high temperature and high humidity environment (35℃, 90%RH) in the southern coastal areas of China to test the corrosion resistance and short circuit prevention performance of electronic and electrical products; simulating the low temperature and low humidity environment (-20℃, 30%RH) in the arid northwest areas to assess the sealing performance and material stability of products, realizing the accurate simulation of use environments in different regions.

3.4 Humidity Alternating Climate Simulation
Humidity alternation is a typical feature of the natural climate and an important factor affecting product reliability. The temperature humidity controlled chamber of LISUN GDJS-015B can accurately simulate a 12h+12h dry-wet alternating cycle (in line with GB/T 2423.4-2008 standard), and reproduce the alternating effect of temperature and humidity in the natural environment through the dynamic cyclic changes of temperature and humidity. For example, simulating the diurnal temperature and humidity changes and the temperature and humidity fluctuations of seasonal alternation to assess the structural reliability and performance stability of products under long-term alternating environments. Problems such as the aging of packaging glue of LED lamps, the corrosion of solder joints of electronic components, and the cracking and deformation of materials can all be found in advance through this simulation test.

4. Industrial Application and Standard Compliance of the Temperature Humidity Controlled Chamber
The climate simulation capability of the LISUN GDJS-015B Temperature Humidity Controlled Chamber is in line with relevant domestic and foreign testing standards, covering multiple fields such as electrical and electronic, lamps, and road vehicles. The specific reference standards include GB/T 2423.1-2008, IEC 60068-2-30:2005, IES LM-80-08, etc., which ensure the authority and compliance of test results and can meet the multiple needs of product R&D verification, production quality inspection and international certification.

In the LED lighting industry, the controlled chamber can provide a long-term stable temperature and humidity environment, meeting the requirements of the IES LM-80-08 standard for the lumen maintenance rate test of LED lamps, and is a core equipment for the service life verification of LED lamps; in the electronic and electrical industry, it can simulate high and low temperature and humidity alternating environments to test the environmental adaptability of semiconductor devices, capacitors, circuit boards and other products, and find problems such as electric leakage, short circuit and performance attenuation in advance; in the automotive electronics industry, it is in line with ISO 16750-4:2018, GB/T 28046.4-2011 and other standards, and can simulate the extreme climatic conditions during vehicle operation to assess the reliability of on-board electronic equipment.

In addition, the temperature humidity controlled chamber can also be applied to materials, aerospace, instruments and meters and other industries. By simulating different climatic conditions, it realizes the scientific assessment of material weather resistance and product structural stability, providing data support for industrial technological upgrading and product quality improvement.

5. Conclusions and Prospects
As the core functional unit of the high and low temperature humidity alternating test chamber, the design and performance of the temperature humidity controlled chamber directly determine the climate simulation capability of the device. The temperature humidity controlled chamber of LISUN GDJS-015B high and low temperature humidity alternating test chamber realizes the accurate simulation of a variety of natural climatic conditions such as low temperature, high temperature, constant temperature and humidity, and humidity alternation by virtue of its optimized structural design, high-precision sensing and control system, and wide range of temperature and humidity regulation. The temperature control accuracy reaches ±0.5℃ and the humidity deviation is only -2%~-3%RH, which can meet the product environmental adaptability testing needs of many industries such as LED lighting, electronic and electrical appliances, and automotive electronics.

At the same time, the temperature humidity controlled chamber is in line with a number of domestic and foreign testing standards, equipped with remote monitoring and data traceability functions, and has both test scientificity and operational convenience, making it a key equipment for industrial product R&D, quality inspection and certification. With the development of industrial manufacturing towards high-end and intelligentization, the requirements for the environmental adaptability of products are constantly improving. In the future, the temperature humidity controlled chamber will develop towards a wider temperature and humidity range, a faster temperature and humidity change rate, and a more intelligent control system. Combined with 5G, AI and other technologies, it will realize the automation, intelligence and personalization of climate simulation, providing a more scientific and efficient solution for product testing in more industries.