Speaker
Description
Two-phase cooling systems are relying on the high efficiency of the fluid phase change to store and transport the heat (latent heat). The operation of these systems needs to control the saturation conditions with very high accuracy and without discrepancy during the lifetime of the cooling system. This lifetime can be from 5 years up to 20 years or more, including storage and operation time. In that context, the chemical compatibility of two-phase cooling devices is of primary importance due to severe impact on the performance of the thermal transfer function. These devices are tight-closed systems, and no maintenance can be performed over the lifetime, requiring a high level of criticality for the validation of a stable chemical compatibility. Indeed, the closed internal environment needs to avoid the generation of non-condensible gases leading to a change in the saturation conditions and thus, in the final operating parameters and performance of the two-phase devices.
The proposed presentation exposes the tests performed in the configuration with aluminum and stainless-steel using ammonia as working fluid. The test has been performed over a long time at an operating temperature over 80°C. The observed results are discussed.
