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Prior to the alterations, wort chilling (4 brews per day) was carried out with the classic ice bank method. The brewery's plans to increase output to 9 brews per day necessitated a new refrigeration solution. The task comprised planning a system operating at practically constant capacity all day long. In addition, it should include scope for possibly integrating a heat pump in the system at a later point in time to supply heat to the adjoining buildings ("Braustüberl", grammar school etc.).
Demands:
Planning of an indirect refrigeration system capable of chilling 190 hl brewing water from +16°C to +2°C in 2.5 hours. In addition, the cooling water consumption for the condensers should be reduced or avoided.
Solution:
An NH>3 system was installed with separator and plate evaporator as a gravity unit. The redundant concept also included two reciprocating compressors. To dispense completely with cooling water, an air-cooled condenser was chosen for refrigerant condensation.
This system cools a glycol circuit to -2°C. A secondary plate heat exchanger (glycol/brewing water) with outlet temperature control then brings the brewing water to the required temperature (+2°C) which is stored in an isolated tank.
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