Saving of costs with THERMOVENT air curtains
Warm air is up to 20% lighter than cold air. It flows through the upper part of the door opening at a speed of about 1m/sec to the outside. Cold air enters at the same time through the lower door area.
At a factory gate (5x5m clear opening) and an outside temperature of 0°C 12.5 m³ warm air per second is flowing outside.
In two minutes, there is a loss of 1,500 m³.
The same amount of cold air 1,500m³ is flowing in at the same time and must be energyintensive reheated.
1 liter of oil is required to heat this cold air from 0° C up to 20° C.
|This is the formula for the calculation of the energy required for heating air:
Q = m x c dt
Q = energy MJ
m = mass of air 1,239 Kg/m³
x = airflow m³
c = constant heat of the air 1.005
dt = 20 ° C temperature difference
39 MJ = 1.293 x 1500 X 1.005 X 20
35 MJ = 1 ltr. heating oil
One door opening, described above, costs at an unprotected gate in winter about 1 euro.
- In the summer of 0.5 euro.
With daily 25 door openings, the cost of warm air losses amount to about € 5,000 per year.
80-90% of the hot air leakage can be prevented by the use of THERMOVENT air curtains.