A machine extension by another 4 dryer compartments by the textile machine manufacturer Brückner Textile Technologies GmbH & Co. KG, Leonberg/Germany, were installed at the turn of the year 2018/2019 at the specialist for sealing and insulation products Hanno Werk GmbH & Co. KG, Laatzen/Germany. With this the production speed could be increased by 65-100%; the specific gas consumption/m² of transfer adhesive was reduced by 30%.
In order to increase the energy efficiency of the line, a Brückner Eco-Heat PE 15 air/air heat-recovery system was ordered in addition to the machine extension. The heat-recovery unit uses the exhaust air heat to heat up fresh air. The heated fresh air is fed to the dryer, thus reducing the heating requirement of the dryer.
An inspection of the cross-flow heat exchangers of the heat-recovery system after 12 months of operation has shown that there is no caking of pollutants. Therefore no special cleaning is necessary. Only the outside air filter needs to be cleaned from time to time to prevent pollen and dust from the outside air from entering the production building.
The energy saving concept was checked and supervised by an energy consultant EnergiePunkt UG, Hildesheim/Germany. The confirmation by an accredited energy consultant is required in order to receive a subsidy from the KfW Bank for the total costs of the heat-recovery system. This ensures that only sensible heat-recovery concepts benefit from EU subsidies for CO2 avoidance.