AHT (Condensation Climate with Variable Humidity and Air Temperature) Tests

The condensation temperature is the temperature at which a particular gas phase component condenses into a liquid. This temperature depends on the physical and chemical state of the system. Condensation is the formation of water on a surface. Condensation occurs for several reasons. Reasons for condensation are as follows, but not limited to:

• The interior surface temperatures of windows and doors are lower than the dew point of the surrounding air
• Indoor humidity is high
• Outdoor temperatures are too low

Examples of this are increased humidity levels in everyday life, while showering, cooking and even breathing. This is why water droplets form in a glass with a cold drink in a warm room. This situation is condensation in its simplest form.

Relative humidity is a measure of how much moisture is in the air compared to how much moisture the air can hold at a given temperature. Warmer air can hold more moisture than cold air.

At a given amount of moisture in the air, the relative humidity rises as the air temperature drops. Under the right conditions, condensation can be expected to form on windows and doors. The higher the relative humidity, the warmer the surface temperature must be to prevent condensation. In order to reduce the possibility of condensation, the maximum indoor relative humidity percentages were calculated based on the outdoor temperature varying with the indoor temperature of 20 degrees.

Industry standards provide reliable test methods for evaluating condensation resistance to make valid comparisons between windows and doors.

There are three known condensation rating systems:

• Condensation resistance factor developed by the Window and Glass Industry Alliance
• The intensification rating developed by the National Window Rating Council
• Temperature index developed by the Canadian Standards Association

Generally, manufacturers use one of these systems for their products. In all three systems, higher values ​​indicate better condensation resistance. There are many factors that cause or control condensation. These ratings are not intended to predict actual condensing performance in an environment, but provide resources for relative product condensation performance comparison.

Our organization also provides AHT (variable humidity and 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.