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GrowFAQ :
How can I keep my reservoir cool?
Added by: snoofer Last edited by: snoofer Viewed: 154 times |
Rated by 19 users: 8.80/10 |
Contributed by: snoofer Thanks to: burnaby, smoking fl, 430scrog, Bayou grower, Mia Stoner, Seeker4TAO, Stoner133
Maintaining a highly aerated root zone at optimum temperature is key to achieving high yields and problem-free grows. This FAQ focuses on indoor hydroponic reservoir cooling options.
Why do I need cool root temperatures?
High root zone temperatures often plague indoor growers running water culture (aero/bubbler/dwc/hydro) systems. These systems are subject to rapid heating by intense HID lighting, which increases root zone temperatures, which decreases dissolved oxygen (DO) levels. Rapid plant growth, combined with low DO levels, can cause oxygen deprivation which in turn can result in infection by opportunistic pathogens such as pythium.
The key to maximum growth is to keep the air temperature at 75-80F, but the root zone at 68F or less. Note: the reservoir should be kept slightly cooler than the rootzone – irrigation and system heating will warm the water by the time it reaches the roots.
Optimum root growth occurs at 70-75F; however, destructive root diseases also grow and reproduce rapidly at these root temperatures. Maintaining nutrient temperatures at or under 68F maximizes root growth and DO, and inhibits pythium.
Reservoir cooling options:
Warm summer temps often require aggressive cooling measures. Bubblers and dwc are difficult systems to temperature regulate due to their (usually) small volumes and lack of external reservoir.
Note: spray / drip / mist / circulate nutrients on a frequent basis to equalize reservoir and root zone temperatures. Intermittent spraying may require a slightly lower tank temp, to compensate for system heating occurring during “off” spray cycle. (ie. Keep tank temp around 64F for intermittent spray cycles, 68F for continuous spraying).
Note: submersible pumps add heat. Use an external/inline pump to minimize heat transfer. High quality digital thermometers are recommended.
A coil of stainless steel is put into the reservoir, cold tap water is trickled through the coil and the overflow runs down the drain. A circulation pump in thte rez makes the cooling more efficient. Adjust tap flow as necessary (Water use can reasonable). No power, unlimited cooling, quiet.
Making your own cooling coil:
Scrap yards and appliance repair shops are full of A/C and fridge coils: 4-20 loops (more surface area is better), with male garden hose connectors welded to each end (Don’t use copper or nickel coils). Available in Hydro stores (around $100 cdn).
Note: Cooling coils may not be useful for those on metered water.
DIY heat exchangers: try hot tub suppliers, home brew stores.
Links: DIY chiller link
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Last modified: 01:00 – Aug 28, 2002 |
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Quicklink: http://overgrow.com/growfaq/1285 GrowFAQ © 2000-2004 Overgrow faq:1285 “How can I keep my reservoir cool?” |
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