Air distribution system suitable for tea brick fermentation process - Upward vertical wall attached ventilation
Affiliation of Author(s):
建筑设备科学与工程学院
Key Words:
Tea brick fermentation chamber
Vertical wall attached ventilation
Numerical simulation
Air distribution
Evaluation index
Abstract:
In tea brick fermentation, the temperature in the fermentation chamber has an important
influence on the reproduction and growth of the golden flower bacteria inside tea bricks. In
order to form a uniform and suitable fermentation temperature, the study introduced an
upward vertical wall attached ventilation based on the load distribution characteristics of
the tea brick fermentation chamber and the practical placement of tea bricks on the shelf.
The air distribution of upward vertical wall attached ventilation under different supply air
temperature differences was numerically investigated by a mathematical model of flow
and heat transfer. Furthermore, the results were compared with two other traditional
ventilation modes, which are diffuser ventilation and displacement ventilation. The up-
ward vertical wall attached ventilation demonstrated higher ventilation efficiency and
least vertical temperature stratification due to its lower flow resistance. Thus, the tem-
perature unevenness coefficient in the product area could be reduced by between 54.3%
and 77.5% compared with the diffuser dilute ventilation and displacement ventilation.
Moreover, the upward vertical wall attached ventilation could help to eliminate the indoor
heat load during the fermentation of tea bricks, which increases the energy utilisation rate
of supply air by 1.7%e18.5%. Therefore, the vertical wall attached ventilation can effec-
tively improve the temperature distribution of the tea brick fermentation chamber and
improve the energy utilisation of the air supply.
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