hi there i have done the searches and cant find wot i am looking for so hear gose im going to grow in a shed and the problem i have is if my exhust just pumps out hot air it will stand out a mile away . im looking for a heat exchange unit i have an unlimited supply off water and can get rid off hot water no problem . so i am looking for a unit that will transfer the heat from air -water any help would be great oh yeh am going to be running 2x600w hps and using an 8" fan thanks

I guess the best thing would to be build a box inline with your extraction and have inside it something like a car radiator or 2 that has the hot air pushed through it and with cold water being pumped through it. You then have another radiator outside the box and even away from the grow to give out the heat. You might be able to get away with a normal household radiator here, because you won't be limited for space.

If you have an unlimited supply of water then maybe a closed loop wouldn't be needed, but don't waste water just to cool a grow!

what about bubbling the warm air through a pond?

if you reallt need it cool i would buy plentyy of aluminium ducting and bury it in a coil under the shed as the cold earth will cool it down if say its about 10 metres of tube but this is pretty extreme but sometimes these measures can stop alot of sh?t,

hope this helps

An insulation sheet tent inside the shed with an airspace between shed and tent, pump out into the airspace and drill holes on the shed floor, etc.... this may also diffuse the heat signature of the shed a bit.....

hello there,you can buy a condenser that fits to a tumble dryer that you basically pump your hot air in to that might be worth a go try argos dont think there dear mate..
area51

If your water supply has enough pressure to run misters you could make an evaporative cooler for the exhaust to cool the air before it leaves the shed.

hi every one thanks for the replys i woz allready thinking along the lines off the car rad idea . i will go in to a bit moor detaile now that im a bit moor awake . i got a shed wich is 10'x14' a little over half this space is goinig to be my grow area the other half is for storing junk and a place to mount my fans and so on at the back off the shed is a log shed lean2 and aprox 10' away is my very larg pond . woz thinking along the lines of pumping water out off the pond in to a set off 3 or 4 car rads in a box with the hot air going fro them then having the warm water going back in to the bottom off the pond . affter the air has been cooled it will exit the shed by an out let in the log shed . the shed has got a lot off insilation so am not worryed about that am trying to be carefull as pos . if it helps the pond is about 30'000 liters off water hope that makes sense and soz for any bad spelling peace and good luck farmer boy

i grow in shed and pump the extraction underneath shed done this way for 4 yrs when the chopper is out though im always scared be interested in hearing these innovating ideas

I`d use a closed loop of non perforated black drainage pipe with concrete slabs to weigh it down in the pond.
You`d have to bury it from the wood shed to the pond but it doesnt sound too far.
Use a box with 2 sliding shutters to route the airflow to/from the pond in a closed circuit for summer cooling or just out to the pond and back then exhaust the cold air via the shutter box into the woodshed in winter.
Its ideal as an air conditioner 30,000L of water = 20kw of heat to raise the temp by 1 degF

tried this last summer. they are filled with ice, the idea is you pump in hot air, it gets cooled by the ice and cool air comes out. didnt work. the ice will melt very quikly at anything close to 30 degrees