Explain different aspects of thermal chamber

Thermal testing is carried out in a thermal chamber, also known as an environmental test chamber. The testing is carried out using convection. The main purpose of this chamber is for humidity tests.
In most cases, a fan is utilized for the forced air convection, much as in the convection oven that you have at home; the only difference is that, rather than baking cookies, you are evaluating various pieces of machinery and technology.

Background
Thermal shock testing is a simulation of the significant temperature variations a product could be subjected to while being used in real-life situations by consumers. Consider, for instance, the shock sent to a smartphone’s battery whenever its owner transitions from the chilly winter circumstances outdoors to the warm inside of their house.
Or consider the drastic shift in temperature that aircraft components are subjected to when a jet takes off from a runway in temperatures of 95 degrees Fahrenheit and then reaches an altitude where temperatures range from -40 degrees Fahrenheit to -70 degrees Fahrenheit.
Products are put through a series of durability tests in thermal chambers to determine their breaking points and how well they can withstand severe hot and cold air temperatures. Failures are less likely to occur because of the technique. These chambers are equipped with two zones, one for heat and one for cold, with a third zone that maintains an ambient temperature as an option.

Thermal chamber

Construction
A powder-coat finish is applied over heavy-gauge steel in the building of the outer chamber, and type 304 stainless steel is used for the construction of the interior chamber. Between the two layers is a layer of high-efficiency, low-K-factor thermal insulation to achieve the maximum possible efficiency and temperature performance.
There are two distinct zones available with the LISUN Series. Your item is placed in a basket controlled pneumatically and moved vertically between the two temperature zones in a matter of seconds. This allows for a quick temperature change to be achieved. (You have the option of adding a third zone to monitor the ambient temperature.)
Each compartment has a heated and cooled zone, allowing you to maintain your desired temperature. The uniquely crafted basket functions as a mobile workplace and comes equipped with its sensor, allowing you to monitor the environmental conditions present in each zone, the temperature of the specimen, and the amount of time it takes to recover.
When you need to chill down your specimen even more quickly, you have the option of adding a blast of liquid LN2 or CO2.
It may connect a third zone exposed to the ambient temperature between the hot and cold zones.
It is important to take notice of the different cooling options available in the 2900 and 9100 versions.
1) Cascade mechanical refrigeration keeps GDJS-015B models at a comfortable temperature.
2) GDJS-015B models employ liquid nitrogen to attain frigid temperatures. There is no mechanical kind of refrigeration pres.

Features
1) The thermal chamber is separated into three distinct zones: the testing zone, the high-temperature zone, and the low-temperature zone. The test sample is now operating in static mode.
2) A touch-control graph control as the operation interface makes it simple.
3) Use the wind as a conduit to the shocking manner of transmitting temperature to the test zone for cold shock measurement.
4) The maximum time for extremes in high or low temperatures may go up to 999 hours.
5) Circulation cycles are 9999 times.
6) An automated Circulation Shock or a manually selected shock may be carried out using this technology.
7) The thermal chamber uses a binary cooling system, rapidly impacting the cooling process. The technique of cooling used is water cooling.

Heating Zone
The heating solutions offered by LISUN use just electricity. By moving air across resistance heaters with a ceramic core and a rapid reaction time, they can function, which guarantees that they will have a long and dependable life with minimal downtime.
It may control temperatures precisely and linearly thanks to various factors, including airflow, instrument response, and these quick-acting heaters. The heating systems of LISUN can reach temperatures of up to 180°C (356°F), and individual heaters may be regulated autonomously or in conjunction with one another.
The heating systems are concealed behind a plenum to protect test objects from being affected by direct radiation.

Cooling zone
Thermal chambers allow testing to begin as quickly as feasible and include rapid temperature change rates. The GDJS-015B Series features a pull-down rate of 2.5 degrees Celsius per minute and a ramp rate of, on average, 4.4 degrees Celsius per minute.
There is liquid cooling included in the chambers. This technique uses less electricity and occupies less space than air-cooled solutions do while offering comparable performance. Remember that a water supply is necessary for any chamber that uses liquid cooling.
Considerably while a conventional LISUN chamber can only achieve temperatures as low as -70 degrees Celsius, there are other methods to get to even lower temperatures.
Liquid nitrogen (LN2) and carbon dioxide (C02) boost options are available. Since carbon dioxide has a lower boiling point than liquid nitrogen (-57 degrees Celsius, or -70.6 degrees Fahrenheit), less of it may be stored at one time. Therefore, liquid nitrogen offers far higher pull-down rates than any other viable option.

How Does Thermal Shock Testing Work?
The item being tested (also known as the DUT) is placed within a basket that can automatically move between hot and cold zones in seconds. This helps to achieve a quick temperature change. Both an air-to-air and a liquid-to-liquid system are viable options for controlling the temperature of these zones.
Although air is the more common medium, an alternate method includes the introduction of liquid nitrogen (LN2) or carbon dioxide (CO2) into the GDJS-015B  thermal chamber. This method is used to broaden the temperature ranges that may be achieved and to quicken the pace at which temperatures can shift. This kind of boost is called a “liquid boost.”
A blast of liquid nitrogen may quickly bring the temperature down to -185 degrees Celsius (-300 degrees Fahrenheit). In comparison, a dose of carbon monoxide can instantly bring the temperature within the chamber down to -73 degrees Celsius (-100 degrees Fahrenheit).
There are a few common standards that ensure. DUTs are rigorously tested. These standards are MIL-STD 883K Method 1010.9, MIL-STD 202H Method 107, MIL-STD-202G, and MIL-STD-883G. This is because many components that go through temperature shock testing are utilized in the aerospace and defense industries.

What Industries Conduct Thermal Shock Testing?
Thermal shock testing is an excellent method for measuring the durability of electrical, electromechanical, plastic, and mechanical devices destined for use in medicine, consumer goods, aerospace, the military, or the automobile industry (think of starting a car in the winter).
Consider the changes in temperature that may occur in different components of an airplane when the aircraft’s altitude rises or falls, as well as the wear and tear that can occur on a GPS device when it is used in undeveloped areas by researchers doing fieldwork. Whether these electrical devices can work effectively is sometimes a matter of life and death.

About Thermal Shock Chambers
You might use several different chambers to carry out thermal testing. Consider that you have access to two separate temperature chambers. You could condition one to reach the extreme heat level and the other to get the extreme cold level, and then transfer the DUT between both so long as they were near each other. For instance, if they were stackable models, this would be possible.
However, some chambers have been created expressly for testing thermal shock, and you need to give this alternative much thought. The military criteria that were described before are quite precise. If you depart from the requirements at any point throughout the process, even for a little period, you will be required to explain the deviation and how you made up for it somehow.
When testing for thermal shock, a thermal chamber that has been designed properly will not have this problem.
To keep a high level of efficiency and temperature performance, the modern thermal shock chambers that are the best use an exterior made of heavy-gauge steel and an interior made of stainless steel. Additionally, these chambers have a layer of thermal insulation that is highly effective but has a low K-factor.
These chambers are divided into two distinct zones; one provides a cooling environment, while the other provides a heating one.
The cooling zone is outfitted with a conventional cascade refrigeration system, often developed with rapid recovery rates. Air cooling is not as able as liquid cooling, but it is less complicated and costs less money than its liquid counterpart. Air cooling is not as capable as liquid cooling but costs more money.
The heating zone is entirely powered by electricity and is outfitted with low-watt-density resistance heaters centered around ceramic cores. This prolongs their useful lives with just a little amount of maintenance required.
Chambers that are among the best in their industry can withstand temperatures of up to 220 degrees Celsius (428 degrees Fahrenheit), and their heaters may operate independently to provide extremely responsive temperature management.
Some models even include a third zone in the middle of these two extremes if the testing requires an ambient phase. The DUT is transported from one chamber to the next in a pneumatically controlled basket with a sensor.
This allows the engineers to monitor each zone’s product and temperature. To guarantee that the recovery durations are correct, frequent temperature readings are taken during the testing process in all three locations.
This ensures that the essential electronic-based products encountered in modern life are safe and durable for the aerospace and defense industries and the public. Together, these elements constitute a dependable and accurate procedure that guarantees the current conveniences without which it would significantly diminish life.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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