vent portable heat pump through vertical flu?

[briansandle]

To what height would a portable air conditioner / heat pump lift its vented-out air through a vertical flu?

[gregz]

Seems like it would be easier in cooling mode.

Greg

[briansandle]

Yes. The manual has a warning against adding to the vent hose. One thing will be heat transfer from the hose back into the room. Another will be the weight of cool air if in heating mode, the opposite of a hot air balloon effect.

How many degrees below room temperature is the vented air in heating mode? I am also interested to know how effective in heating the device is which that should bear on. No good in putting out hotter air than drawing in.

In that regard some of the thermostats for heating start at 18 deg C. Any way of decreasing that to 15 or 16?

Brian Sandle

[Steve]

Dunno.... how high can you pee??

thats about how much sense your question makes.

What is the diameter of the discharge hose? how long is it?? how many CFM air discharge is required @ what static pressure? how big is the vertical flue?? how high is it?? What does the operating manual tell you??

[ilbebauck]

ed-out air through a vertical flu?

Longer the discharge tube, the more static pressure (resistance to airflow) , the less air you move thru the tube. Once you start exceeding the mfgr specs then probable trouble arises .

[TimR]

nted-out air through a vertical flu?

If you're putting hot air into the flu (cooling mode) the chimney effect might let you get away with it.

If you're putting cold air in, you just made it worse.

Words of wisdom about flues (not flus):

A flea and a fly in a flue, Were imprisoned, so what could they do? Said the flea "let us fly," Said the fly "let us flee," So they fled through a flaw in the flue.

[soundhill]

vented-out air through a vertical flu?

If the "e" I missed in spelling "flue" be for energy, then that gives some thought.

If the heat pump is lowering the expelled air temperature by 5 deg below outside ambient then the weight of air in a 10m say 15cm diameter flue should only increase a small percentage and it should only take a few watts of fan energy to raise it at say 3 meters/sec. Is the flow resistance more important?

Brian Sandle

[Steve]

If the "e" I missed in spelling "flue" be for energy, then that gives some thought.

If the heat pump is lowering the expelled air temperature by 5 deg below outside ambient then the weight of air in a 10m say 15cm diameter flue should only increase a small percentage and it should only take a few watts of fan energy to raise it at say 3 meters/sec. Is the flow resistance more important?

Brian Sandle

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Resistance reduces volume. Volume is the issue.