ᐅ Double garage heated with a heat blower / construction dryer
Created on: 9 Dec 2014 18:09
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NichtskönnerN
Nichtskönner9 Dec 2014 18:09Hello professionals,
Is a 10 kW construction dryer/heater (gas plus 230 V) sufficient to heat a double garage from about -10°C (14°F) to around 20-21°C (68-70°F)? A lead time of up to 10 hours is not an issue.
It is a double garage with an open gable and an uninsulated roof.
If not, what do you think would be necessary?
Thank you in advance!
Is a 10 kW construction dryer/heater (gas plus 230 V) sufficient to heat a double garage from about -10°C (14°F) to around 20-21°C (68-70°F)? A lead time of up to 10 hours is not an issue.
It is a double garage with an open gable and an uninsulated roof.
If not, what do you think would be necessary?
Thank you in advance!
If it really gets as cold as -10°C (14°F) in the garage, either the door is left open during winter or you live in a high-altitude area.
With an unlimited lead time, once that temperature is reached, you only need to compensate for the heat loss through the external surfaces. To calculate this, you would need to know the volume of the garage and the heat transfer coefficients derived from the construction of the uninsulated walls and ceiling—a kind of heat calculation similar to what is done for heating individual rooms in a house. You would also need to know whether the 10 kW figure is the output capacity of the fan or the power input, as the efficiency would then have to be taken into account. From this calculation, you could estimate whether it is even possible to reach the desired indoor temperature, which is the case only if the supplied power exceeds the amount lost through heat dissipation. With a positive difference, you can calculate how long the warm-up phase will take. No one here can realistically perform this calculation without looking too far into the crystal ball.
Only a practical estimate remains. Unfortunately, I can’t help much with that, since your climatic conditions are quite uncommon for us, and I do not spend time in uninsulated garages during winter. Perhaps someone has held a topping-out ceremony in a garage in winter and can share their experience. I would imagine that in such cases, 20°C (68°F) indoors is not necessary, and the heating relies more on radiant heat from heater panels plus the perceived warming effect of alcohol consumption.
By the way, your plan is not very environmentally sensible. Although your 10 kW input will only marginally contribute to global warming.
With an unlimited lead time, once that temperature is reached, you only need to compensate for the heat loss through the external surfaces. To calculate this, you would need to know the volume of the garage and the heat transfer coefficients derived from the construction of the uninsulated walls and ceiling—a kind of heat calculation similar to what is done for heating individual rooms in a house. You would also need to know whether the 10 kW figure is the output capacity of the fan or the power input, as the efficiency would then have to be taken into account. From this calculation, you could estimate whether it is even possible to reach the desired indoor temperature, which is the case only if the supplied power exceeds the amount lost through heat dissipation. With a positive difference, you can calculate how long the warm-up phase will take. No one here can realistically perform this calculation without looking too far into the crystal ball.
Only a practical estimate remains. Unfortunately, I can’t help much with that, since your climatic conditions are quite uncommon for us, and I do not spend time in uninsulated garages during winter. Perhaps someone has held a topping-out ceremony in a garage in winter and can share their experience. I would imagine that in such cases, 20°C (68°F) indoors is not necessary, and the heating relies more on radiant heat from heater panels plus the perceived warming effect of alcohol consumption.
By the way, your plan is not very environmentally sensible. Although your 10 kW input will only marginally contribute to global warming.
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