Im wondering how to work with 20' ceilings. Do i build a 12 ceiling and make the room smaller or do i heat and cool all the space?
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20' ceilings
- Thread starter PoopyTeaBags
- Start date
If I had a 20' height to grow with. I personally would just lower the lights off of
some type of framework or something without any walls. Most people complain
about not having enough height because they grow in small cabinets.
I bet they wish they had your problem now.
I wish I could have another 6 feet anyways in height.
some type of framework or something without any walls. Most people complain
about not having enough height because they grow in small cabinets.
I bet they wish they had your problem now.
I wish I could have another 6 feet anyways in height.
Hang from the 20' ceiling...
In my warehouses, the higher the ceiling, the easier it was to cool...
easier to cool?
i was thinking it would be harder and i would need more btu's
i was thinking it would be harder and i would need more btu's
Plus heat rises so...
Me personally I would build a room inside it, just thinking from a C02 perspective but I guess if your not using CO2 it will probably be easier to cool the larger space because you got better heat dissipation. Takes more heat to heat the room means less cool air to cool it but if you were to heat this larger space up it would require more cooling to cool back down. It's volume of air. Here is how it works, If I have 1 1k light in a 20x20x8 room and I have 1 1k in a 10x10x8 it will take 2 times as long to heat the 20x20x8 as it does the 10x10x8. It's air volume at work here the larger the volume of air the larger the heat dissipation will be. But if you manage to heat up that larger space you will certainly need more cooling capacity to cool it back down. You get a large enough volume of air and you won't be changing the temperature very easily. Basically a larger space is easier to cool because its harder to heat up but it goes both ways.
My vote is to build out a room inside the space, because to me trying to raise the CO2 lv in that large of a space would be very wasteful.
My vote is to build out a room inside the space, because to me trying to raise the CO2 lv in that large of a space would be very wasteful.
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if you are going to insulate and air condition a space... generally you want that space to be no larger than necessary owing to cost of insulation, building materials, and increased heat gain.
all things being equal, the taller room will have higher heat gain than a shorter room... simply because it has more wall area.
yes large rooms have more thermal inertia( hence the 20' tall poly tunnel) so they will resist changes in temperature more so than a smaller room... but this cuts both ways.
it will take longer to cool down a tall room, just as it will take longer for that room to heat up once you stop cooling it.
i really can only see that being benifical for marginally sized ac systems... where you have that little extra buffer for the 2 hours or so of peak heat gain.
i think a taller ceiling might SEEM to be easier to cool because the heat from the lamps is lingering higher up than it would be in an 8 or 10 foot ceiling. but unless you are allowing that stratified heat to escape back into the environment somehow, it will not effect the total heat gain of the lights + external heat gain.
tall rooms will tend to stratify as well...anyone with a vaulted ceiling could tell you this... though the degree of stratification will depend on the type of heat gain and temperature of the supply air.
stratification is not a bad thing during cooling btw. only in heating.
all things being equal, the taller room will have higher heat gain than a shorter room... simply because it has more wall area.
yes large rooms have more thermal inertia( hence the 20' tall poly tunnel) so they will resist changes in temperature more so than a smaller room... but this cuts both ways.
it will take longer to cool down a tall room, just as it will take longer for that room to heat up once you stop cooling it.
i really can only see that being benifical for marginally sized ac systems... where you have that little extra buffer for the 2 hours or so of peak heat gain.
i think a taller ceiling might SEEM to be easier to cool because the heat from the lamps is lingering higher up than it would be in an 8 or 10 foot ceiling. but unless you are allowing that stratified heat to escape back into the environment somehow, it will not effect the total heat gain of the lights + external heat gain.
tall rooms will tend to stratify as well...anyone with a vaulted ceiling could tell you this... though the degree of stratification will depend on the type of heat gain and temperature of the supply air.
stratification is not a bad thing during cooling btw. only in heating.
no thats not right.
the internal heat gain is the same regardless of height. the external heat gain is MORE owing to more wall area.
heat will not dissipate due to large walls UNLESS the temp inside is greater than the temp outside. and in that case it would have to be much higher than the outdoor temps to matter much... especially considering internal heat gain with all these lights will huge.
the reason your ac runs nonstop in the summer is because the temp delta across your walls and ceiling partitions is 30-40 degrees f.( and days are longer obiviously)
its even worse way up north... in main or north dakota or where ever... you can get 60 degree deltas. this iis why northerners usually have better built houses. with deltas such as that, air leakage and insulation matters ALOT more than a house in tenesse or where ever... with peak design temps are like 91 and 41 respectivly.
in north dakota or where ever you get design temps of like -30 and 85 so you really need those r30 walls and r60 ceilings.
anyway, what you say is not correct because once you reach steady state it simply does not matter as the fluxes of heat in and out are the same( save for additional heat gain from the larger wall areas).
you really can treat heat gain and heat loss figures as you do a mass balance equation... simply put, heat added must be taken away just as water added to a tank must be also taken away.
a building or room like this is basically the equivalent of a colander or sieve immersed in a pool of water... the internal heat gain is like a hose outside the system pouring into your sieve, and the external heat grain is the water entering from the tiny holes in the sieve pushed in from the pool below.
you have to remove the water regardless of how tall this sieve is... moreover the taller the sieve, the more of the porous surface is exposed to the pool below, so naturally it collects more water from the pool.
thats actually a good point... a tall ceiling certainly has some PRACTICAL avantages like you say.
this is why almost 100% of commercial construction uses drop ceilings on ten foot + cesilings. it gives you a FLEXIBLE space to rout HVAC, plumbing, low voltage cabling etc.
commercial leases are usually 2 or 5 years so you have to consider that one might be tearing up that space every now and then... having a place to rout and reroute duct work INSIDE the conditioned space might pay huge dividends over say... building a 8' space and running duct on the exterior, or in an attic space where its less accessible.
you certainly should weigh the good things(possible drop ceiling/ overhead storage) about tall ceilings against he bad(increased heat gain).
Start with a manual J... u might find that the additional ceiling height will not push u over the edge, forcing u to up size a condenser unit.
Drop That Sound
Well-known member
I would build a loft with a stairway up to the top, for 1/2 the room, use the other half for another shop or something. If thats an issue.. recently on craigslist I seen a complete free suspended ceiling grid, panels and all. You might check your local area! Then you could blanket insulation on top of it.
Douglas.Curtis
Autistic Diplomat in Training
My first thought was veg rooms.
Can build one or two up there with all the ducting and cabling run between/around them.
Otherwise, I'd say you have about twice as much height as you need there.
Douglas
Drop That Sound
Well-known member
My first thought was veg rooms.
Can build one or two up there with all the ducting and cabling run between/around them.
Otherwise, I'd say you have about twice as much height as you need there.
Douglas
Same here, with just enough ceiling height to stand up in the top( better than crouching over), the rest for the flower floor. All the gear up top for sure
