warm air

[Rich D]

A nearby college includes a building, surrounded by an
outdoor arcade, at street level. At one point, the warm
internal air is expelled, which is natural, they perform
continuous circulation. A nice spot, on a cold night!

However, I wonder, is there any hazard in breathing that air?
Is it chemically processed somehow, contaminated?

And, isn't it inefficient? The outgoing air ought to
pass through a heat exchanger, to warm the incoming air.
Isn't that wasted energy?

[Jasen Betts]

Post by Rich D
A nearby college includes a building, surrounded by an
outdoor arcade, at street level. At one point, the warm
internal air is expelled, which is natural, they perform
continuous circulation. A nice spot, on a cold night!
However, I wonder, is there any hazard in breathing that air?
Is it chemically processed somehow, contaminated?

possibly it has less oxygen that fresh air, possibly stink and virus
particles?

Post by Rich D
Isn't that wasted energy?

It might be, it depends if their AC is heating or cooling

[Ralph Mowery]

Post by Rich D
A nearby college includes a building, surrounded by an
outdoor arcade, at street level. At one point, the warm
internal air is expelled, which is natural, they perform
continuous circulation. A nice spot, on a cold night!
However, I wonder, is there any hazard in breathing that air?
Is it chemically processed somehow, contaminated?
And, isn't it inefficient? The outgoing air ought to
pass through a heat exchanger, to warm the incoming air.
Isn't that wasted energy?

Usually the air is passed through a heat exchanger so some of the hot
inside air will heat the cold outside air before it enters the building.

There is no chemicals involved. You will be exposed to a combination of
all the air in all the rooms in the building. Could be a good way to
contract any virus that anyone in the building has.