AT (Condensation Climate with Variable Air Temperature) Tests

Condensation is when water changes from gaseous (i.e. water vapor) to liquid water. Condensation usually occurs when warm air rises in the atmosphere, cools and loses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets. Condensation is crucial to the water cycle because that's how clouds are formed. These clouds can produce precipitation, which is the primary way water returns to the earth's surface within the water cycle. Condensation is the opposite of evaporation.

The fog that forms at ground level in the environment, the water droplets formed inside the windows on a cold day, the condensation of the glasses when going out from a cold room on a hot and humid day, the water dripping from the outside of an icy glass are all caused by the condensation of the water.

As steam moves between its liquid and solid forms, the phase change that accompanies water affects the arrangement of water molecules. Water molecules in vapor form are more random than liquid water. As condensation occurs and liquid water is formed from the steam, the water molecules become more organized and heat is released into the atmosphere as a result.

The ISO 6270-2 standard, developed by the International Organization for Standardization (ISO), describes the general conditions and procedures that must be observed when testing coated test specimens in constant condensate atmospheres or varying condensate atmospheres to ensure the results of tests performed in different laboratories are verified.

This AT test is based on a variable temperature condensing atmosphere only and requires a reduction of 100 degrees to 40-18 degrees Celsius while maintaining the condensation humidity level of about 28 percent RH. This standard replaces the European standard "DIN 50017 Atmospheres and technical applications - Condensate test environments".

During tests, samples are placed in a closed chamber and exposed to a changing climate consisting of a two-part iteration cycle. It is exposed to a mixture of heated, saturated air and water vapor for 40 hours at 100 degrees Celsius and 8 percent relative humidity. This is followed by 16 hours of exposure to room temperature (18 to 28 degrees Celsius) and relative humidity less than 100 percent RH.

Our organization also provides AT (variable air temperature and condensation climate) testing services with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.