Legalized cannabis/marijuana is kind of a gold rush, as equipment manufacturers begin to venture into a market long in the shadows. Many growers have been turning to design-build contractors to provide cooling and dehumidification systems to help them maintain the temperature and humidity conditions needed for the various phases of marijuana grow operations. For example, growing temperatures should be kept at 77° to 80°F to produce the largest yields, while humidity must be tightly controlled during drying operations. The cooling demands are based on how much light enters the building; most buildings tend to experience

Refrigeration, has been involved in produce and agriculture storage for many products, including vidalia onions, tomatoes, potatoes, bananas, apples, pecans, zucchini, etc. These applications often require customized, rather than standard units.

Our ability to work closely with a wide variety of agricultural applications. Working with growers to determine their temperature and humidity requirements, as well as serviceability needs, we then design systems for specific applications and requirements.

Cannabis cooling equipment, experts partnered with refrigeration equipment designers who, in the past, focused on salmon hatcheries and other produce warehouse storage. These experts say the difference between air conditioning and refrigeration is huge, and this difference has an enormous impact on marijuana grow operations. In an air conditioning-based system, an HVAC contractor installs one or more large air conditioners, typically sized for an office space, and then installs ductwork that simply recirculates the air. The air conditioners attempt to maintain the optimal temperature. Humidity is handled by pairing the air conditioners with either off-the-shelf or custom made dehumidifiers.

Problems arise because the air conditioner and humidity components are installed separately, and the two systems don’t communicate with each other. This is especially critical at night; when the lights go off, the humidity rises to very high levels. When the humidity is too far off, the plants can grow mold or become infested with spider mites. Another problem is the sheer cost of the dehumidifiers, including equipment, plumbing, and wiring costs.



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Reheat Theory and Applications
The refrigeration circuit actually does the dehumidification. But that causes the room temp to get too cold so Liebert and others of most all makes of these types of systems use reheat to bring the room temp back to "normal" or set point while the compressor(s) are running.

Without the reheat the room will get too cold in order to satisfy the dehumidification setting. The reheat does have an added advantage in that it assists in the dehumidification process, but that is not it's main purpose.

Typically, any heating coil located in a fresh air supply (OA) is usually called a preheat coil. Most preheat coils are used in commercial applications where large volumes of air must be introduced during cold weather in order to meet code requirement for minimum fresh air.

Econimizer Coil
water: A system by which the supply air of a cooling system is cooled indirectly with water that is itself is already cold by outside ambient of the environment without the use of mechanical cooling.


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