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Exhaust pipe in chimney vent Romanise 04-29-2008
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Posted by Romanise on April 29, 2008, 11:11 am
Instead through wall, thinking to put the exhaust piping of Air-
Conditioner (http://www.ebuyer.com/product/128101) in the chimney
vent.

My flat is on the ground floor with two more floors above me.

I understand that hot exhaust will not fall back in my flat and I do
not need to do any packing in the chimney vent.

Piping is flat 1.5cm x 9.5cm

Chimney vent is 17cm x 37cm

Exhaust end of piping I can insert in chimney vent as much as 38cm.


Perhaps in cold season when I may want to use the Air-conditioner for
heating I may want whole of Chimney vent blocked.

On examination of the vent I found lot of newspaper stuffed in the
vent by previous occupant of the flat. He must have tried to conserve
some heat in the flat by stuffing the vent with news papers.

Posted by Andrew Gabriel on April 29, 2008, 1:18 pm
> Instead through wall, thinking to put the exhaust piping of Air-
> Conditioner (http://www.ebuyer.com/product/128101) in the chimney
> vent.
>
> My flat is on the ground floor with two more floors above me.
>
> I understand that hot exhaust will not fall back in my flat and I do
> not need to do any packing in the chimney vent.

You might -- the aircon's of that type generate negative
pressure in the room.

Which brings me to the second point -- they don't work
very well. All that air you are chucking up the chimney
(or whatever route to get it outside) has to be replaced
by air entering the house, and that brings heat in with
it. The air conditioner will spend much energy fighting
with itself over this, and not so much on reducing the
temperature for you.

If the aircon has a separate air inlet and air path for
the air which is exhausted, connect that inlet to the
outside too (separately and well away from the exhaust).
That will prevent the aircon unit drawing warm air in from
the outside to heat your rooms. Not many aircons of this
type do have separate air inlets though.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Posted by George on April 29, 2008, 2:22 pm
Andrew Gabriel wrote:
>> Instead through wall, thinking to put the exhaust piping of Air-
>> Conditioner (http://www.ebuyer.com/product/128101) in the chimney
>> vent.
>>
>> My flat is on the ground floor with two more floors above me.
>>
>> I understand that hot exhaust will not fall back in my flat and I do
>> not need to do any packing in the chimney vent.
>
> You might -- the aircon's of that type generate negative
> pressure in the room.
>
> Which brings me to the second point -- they don't work
> very well. All that air you are chucking up the chimney
> (or whatever route to get it outside) has to be replaced
> by air entering the house, and that brings heat in with
> it. The air conditioner will spend much energy fighting
> with itself over this, and not so much on reducing the
> temperature for you.
>
> If the aircon has a separate air inlet and air path for
> the air which is exhausted, connect that inlet to the
> outside too (separately and well away from the exhaust).
> That will prevent the aircon unit drawing warm air in from
> the outside to heat your rooms. Not many aircons of this
> type do have separate air inlets though.
>
You are right about those portable units. Unless you get an (uncommon)
version with a separate inlet they are very inefficient becuase of the
high amount of air infiltration.

Posted by Romanise on April 30, 2008, 1:54 am
> Andrew Gabriel wrote:
> > In article
> >> Instead through wall, thinking to put the exhaustpipingof Air-
> >> Conditioner (http://www.ebuyer.com/product/128101) in thechimney
> >> vent.
>
> >> My flat is on the ground floor with two more floors above me.
>
> >> I understand that hot exhaust will not fall back in my flat and I do
> >> not need to do any packing in thechimneyvent.
>
> > You might -- the aircon's of that type generate negative
> > pressure in the room.
>
> > Which brings me to the second point -- they don't work
> > very well. All that air you are chucking up thechimney
> > (or whatever route to get it outside) has to be replaced
> > by air entering the house, and that brings heat in with
> > it. The air conditioner will spend much energy fighting
> > with itself over this, and not so much on reducing the
> > temperature for you.
>
> > If the aircon has a separate air inlet and air path for
> > the air which is exhausted, connect that inlet to the
> > outside too (separately and well away from the exhaust).
> > That will prevent the aircon unit drawing warm air in from
> > the outside to heat your rooms. Not many aircons of this
> > type do have separate air inlets though.
>
> You are right about those portable units. Unless you get an (uncommon)
> version with a separate inlet they are very inefficient becuase of the
> high amount of air infiltration.

Thank you all for responding.

I have purchased http://www.ebuyer.com/product/132907

I just tested it and found it throwing hot air from back side and
throwing cool air from front-top.

The room has air vent with electrical fan on it. There are similar
units in other rooms and during summer times I let fan on one unit
fixed near floor run as the fan only drawas air in and let other vents
fixed near ceiling remain open so that air goes out from them.

Aircon is planned to be used only for couple of months in a year in
one of the rooms. Intention is to reduced temperature somewhat in the
room, the room is not going to be made air tight so air thrown out
will get replaced from other rooms.

Thanks again.

Posted by ransley on April 29, 2008, 1:44 pm
> Instead through wall, thinking to put the exhaust piping of Air-
> Conditioner (http://www.ebuyer.com/product/128101) =A0in the chimney
> vent.
>
> My flat is on the ground floor with two more floors above me.
>
> I understand that hot exhaust will not fall back in my flat and I do
> not need to do any packing in the chimney vent.
>
> Piping is flat 1.5cm x 9.5cm
>
> Chimney vent is 17cm x 37cm
>
> Exhaust end of piping I can insert in chimney vent as much as 38cm.
>
> Perhaps in cold season when I may want to use the Air-conditioner for
> heating I may want whole of Chimney vent blocked.
>
> On examination of the vent I found lot of newspaper stuffed in the
> vent by previous occupant of the flat. He must have tried to conserve
> some heat in the flat by stuffing the vent with news papers.

The air will be humid air, mold might grow, when its cold out air
falls, it will smell bad. when it rains, it might not exhaust at all.

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