Attachment 2 Greenhouse Ventilation.pdf
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- Solicitation number
- 1232SA25Q0624
About this file
This document is an attachment detailing a greenhouse ventilation system modification. The project involves replacing existing ventilation components with a new system that includes removing glass from the center divider wall, replacing supply fans with exhaust fans, installing sidewall louvered vents with 100-mesh screening, and integrating a new control system. The ventilation system features recirculation fans, exhaust fans, infrared heaters, shutters, cooling pads, and a control mechanism.
The controls operation describes a multi-stage cooling process where fans, exhaust fans, and louvers activate sequentially based on temperature, with the system automatically switching between heating and cooling modes. During heating, recirculation fans operate normally and infrared heaters activate. The system will use an iGrow 800 Environmental controller supplied by the government, with the contractor responsible for wiring and device installation. All control wirings must be run in conduit, and relays and contacts must be duty-rated for equipment control.
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Text version
Attachment 2
• Remove glass from center divider wall.
• Replace end wall supply fan with exhaust fan interlocked with new sidewall louvered vents on each side. Meshing screening cover (100 mesh) over sidewall louvers (Screening covering to be oversized as not to limit air flow due to mesh screening.)
• Re-use exhaust fans on side wall and interlock with new shutters on opposite wall.
• Existing infrared solaronic tube heaters to remain.
• Install cooling pad system.
• Install control system and sensor as required.
New Final Ventilation System Arrangement.
Exhaust fan
Infrared heater
Sidewall vent
Shutters
Cooling pad exhaust fan above doors Recirc fan (4)
Controls contactor box to be installed above door with controller installed inside bldg..
Controls Operation
Cooling
• 1st stage: Recirc fans on normally.
• 2ndt stage: Recirc fans turn off. Top exhaust fan comes on and individual louver on each side open.
• 3rd stage: Top exhaust fan to off and louvers shut. Two Side exhaust fans turn off (one in each section and one-half of shutters open (every other one)
• 4th stage: Other two Side exhaust fans turn on and remaining shutters open (every other one).
• 5h stage: Cooling pads\pump turn on.
• System ramps down due to temperature setpoints.
Heating
• Recirc fans on normally.
• Infrared heaters turn on.
Notes:
• One independent controller for the greenhouse.
• All relays and contacts to be duty rated for equipment controlling.
• System to automatically switch between heating and cooling modes as necessary.
• All control wirings be run in conduit to protect from exposure.
• Contractor is responsible for routing all the wiring and installation of devices.
• Government will supply the automation controller (iGrow 800 Environmental controller)
File details come from the government source that posted it. Updated .