This allows finishing mills to always be on the safe side, ensuring growing future demands in respect of heat recovery, exhaust air
cleaning and odour elimination can always be met when required.
As the wind blows, exhaust air
flow from each cooling tower cell is forced to stack up forming one plume for each row.
However, in some cases, adding exhaust air
recovery may not add supply fan power at design and may actually lower it.
The most innovative aspect of this energy retrofit project was the maximization of heat recovery on exhaust air
. The use of heat pumps on the exhaust air
allowed cooling the discharged air at very low temperatures all year-round, ensuring maximum heat recovery and, therefore, rejection in the incoming outdoor airflow as well as elimination of reheat by electric heaters.
The ceramic bed operating as a regenerative heat exchanger has an efficiency of up to 95% compared to the 60-70% of recuperative heat exchangers of conventional thermal exhaust air
At the example conditions depicted in Figure 2, the enthalpy of the outdoor air ([h.sub.OA] = 24.3 Btu/lb [56.5 kJ/kg]) is less than the enthalpy of the exhaust air
([h.sub.EA] = 28.2 Btu/lb [65.6 kJ/kg]).
The module is also equipped with an electric drive which permits computer controlled optimisation of the heat exchanger performance to the prevailing exhaust air
streams something that is not possible with purely static heat exchanger modules.
Without a heat recovery system, the hot exhaust air
is released unused into the atmosphere.
BRACKNER lines provide for an intelligent exhaust air
system which charges the exhaust air
with solvents up to the maximum acceptable limits.
This is possible by optimizing the exhaust air
flow and by a more effective utilization of the thermal energy of exhaust air