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Design Criteria for a Modern Commercial Greenhouse Facility-2

In the first article, we discuss the increase in labor and energy costs for commercial greenhouses, as well as possible solutions that can be implemented during the Greenhouse Design and greenhouse construction phases.
We have discussed the architectural aspects of commercial greenhouses, and we will discuss the greenhouse structure and ventilation/cooling system in this article: greenhouse structure: several things must be carefully considered when choosing a greenhouse structure, including: the building code requires the degree of automation of the crop to be planted to be used in the planting system to be employed. all these problems have a significant impact on the choice of greenhouse structure and will affect the various choices that must be made, i. e.
: Bay width and length drainage ditch and/or Greenhouse ventilation type to be used for Truss height the type of glass window to be used is particularly important and the height of the truss should be carefully considered at this stage
As more and more tables, basket systems, irrigation boom, planting lights and curtains are now standard equipment for most greenhouses, it is often necessary to have a truss height of 20 to 22 feet to accommodate these systems.
In addition, the large air volume in this gutter-high commercial greenhouse provides better climate control capabilities. The choice of greenhouse glass materials depends essentially on the same factors as the structure, although financial considerations usually play a greater role in this component.
For example, there is a big difference between the double-layer polyethylene film and the roof cover of the greenhouse roof (tempered)glass.
The personal preferences and/or experience of the growers also often play a role in the selection of glazing materials.
Several factors need to be taken into account when choosing light up, including transparency, life expectancy, energy values, drip control, flammable and greenhouse maintenance requirements.
Greenhouse ventilation and cooling system: the selection of suitable Greenhouse ventilation system for facilities will be determined by the following factors: crop growth, location and direction of the greenhouse, type of greenhouse, cost of equipment, etc.
Many growers now see natural ventilation as an alternative to the more commonly used forced ventilation system.
The increasing cost of electrical energy, a better understanding of the actual function of Greenhouse ventilation and the improvement of environmental control systems all contribute to this trend.
The emergence of openness-
Roof greenhouses point further in this direction, although this type of greenhouse is not a good option for vegetable-growing facilities.
For vine crops such as tomatoes, peppers and cucumbers, the combination of forced ventilation and natural ventilation may be the best solution.
In this case, the air can be forced into a row of greenhouses below the plants, generating upward air flow through the crops.
For most vegetable crops, including vertical airflow fans will provide additional control over the greenhouse environment.
If the insect net is included in the design, the ventilation system must be designed accordingly and additional flow resistance is compensated. e.

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