Shut out loss
November 1st 2005

Ro-dor is keen to show the kind of savings possible when an energy efficient door is installed. It cites the case of a customer with a 5 by 5m door that remains open 8h/day.

The inside temperature is 18°C.

Outside, the average temperature is reckoned to be 8°C (calculated in the colder months when heating is on), with average wind speeds of 11km/h. The customer needs heating for 120 days/year.

Installing a Dynaco door with an opening time of 20sec/cycle and 200 cycles per day would save £32 000 per year (based on a heating cost of 0.4p per kWh). Rodor calculates that with an average cost of £8000 for a 5 by 5m door suitable for winds of 100km/h, return on investment would be 3 months.

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