Non-invasive determination of the cooling capacity at an ammonia gas stream In a brewery, energy is the second most important resource after water. This applies, first of all, for process heat for the preparation of the brew, and also for the cooling required for the controlled process management of the fermentation process and finally for the storage cellar. The cold supply for fermentation and the storage cellar is normally generated in a central refrigeration plant. Most often ammonia is used as a refrigerant. Within the scope of an integrated energy management system the continuous monitoring of the chiller’s efficiency is mandatory. Besides the measurement of the electric power consumption the generated cooling power has to be recorded. Non-invasive flow measurement of the ammonia gas

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