Say the aircraft A320 is sitting on the tarmac, and the engine is started, everything is ready to go. The tarmac is in the hot Doha desert, and the temperature is a sweltering 60 C. Humidity is in the mid 70%. Air pressure is at sea level or 1000 mbar (1 bar).
Once the control tower gives the signal, the plane does a few turns to proceed to the correct runway, the temperature is still the same as above.
In the space of 15 minutes, when the plane takes off from the runway to the cruising altitude of say 35,000 feet (11100 m), the temperature drops drastically to -40 C, there is almost no humidity and the air pressure is dropped down to say 300 mbar. The plane is at 35000 feet.
That means to simulate this condition in the Lab, the settings on the chamber to test component parts of the plane engine or exterior (such as rudder, fluid manifolds etc) must resemble something like this.
Time 0
Temp : 60 C
RH : 70%
Press : 1000 mbar (1 atm)
Time 15
Temp : -40
RH : 10%
Pressure : 235 mbar (0.235 atm)
Hence the chamber MUST replicate the change rate of +60 + 40 or 100 C in 15 minutes, that is approx. 6.67 C / min change rate
Pressure needs to also get down pretty quickly to 235 mbar.
The chamber required just to follow the environmental changes is what we call the Environmental Stress Screening Chamber or ESS chamber which QRA can provide for a competitive price.
We occasionally also offer ESS services to customers although the costs of running these tests are not inexpensive, owing to the high electricity usage, the machine maintenance costs and the number of cycles and total test time.
For more information, consult the experts,
https://www.qra.com.sg/our-services
https://www.qra.com.sg/our-products
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