Baseline situation

As in most freezer rooms across all sectors, intensive use causes a corresponding build-up of ice on equipment and the room itself. On the one hand, this causes higher energy consumption than necessary and, on the other, regular maintenance costs for snow and ice removal. In the worst case, emergency measures are required and damage to goods can occur.


Only the regular personnel costs for snow and ice removal in a 40m3 freezer room, which were estimated at 16 hours per month, could be saved. Applied to Germany, this means a monthly saving of 149.60 € (16h x 9.35 €), which adds up to 1,795.20 € per year. In addition, electricity consumption was reduced by up to 29%.

In terms of energy, the following was measured (in kWh / 24h)

Workflow and changes achieved

The measurements started on 18 October 2007. The filters were installed on 31 October and the first measurement period ended on 13 November. The second measurement period ran from 14 to 27 December.

In the pre-installation period, an average energy consumption of 46.56 kWh per day was determined, resulting in an annual consumption of 16,996 kWh. Compared to the post-installation period, which recorded an average daily consumption of 36.25 kWh, this corresponds to a saving of around 22%.

After adjustments to the evaporation temperature and thermostat, this saving could be increased to 29%. Despite increased customer traffic and turnover during the Christmas and holiday season.

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