Greenhouse December 30,2021
The Best Ways to Keep Your Greenhouse Cool
Ventilation through natural means
- To triple the cooling rate, use side vents in addition to roof vents.
- Open the doors to let more air in.
- Use internal shade screens with an open weave.
- Turn off the fans that circulate the air.
- Rollup sidewalls should have a skirt.
- It’s critical to keep up with maintenance.
- Reroute the air circulation fan’s flow.
- By putting fans in strategic locations, you can save electricity.
This summer, here are some strategies for keeping your greenhouse cool.
Ventilation through natural means
- To triple the cooling rate, use side vents in addition to roof vents. Vent holes should be provided on both sides of the ridge and on both sidewalls in freestanding greenhouses. During vent operations, the leeward vents should be activate to generate a vortex at the top of the hill containing zeelcofarms. According to the National Greenhouse Manufacturers Association (NGMA), the total sidewall vent area and the combined ridge vent area should equal at least 20% of the floor area. Wind currents are responsible for 80 to 90% of ventilation.
- Allow additional air in by opening doors. The more air that can get in, the cooler it will be. Natural ventilation is more consistent than fans, but it will not chill the greenhouse to a temperature lower than the ambient outside air temperature.
- Use internal shade screens with an open weave. These are the most effective because they enable hot air to exit in a regular manner throughout the house. Cracking closed weave screens is an option, however because to the sun shining on some portions of the plant canopy, this may cause uneven growth.
- Turn off the fans that circulate the air. When natural ventilation is employe, HAF fans should not be use since they may restrict the air movement. This also increases the amount of energy used. Your daily power cost will increase by 2.5 to 5 kilowatt hours for each fan.
- Rollup sidewalls should have a skirt. Early in the season, a 12″ to 24″ high plastic strip will keep chilly breezes away from ground-grown plants.
Ventilation with a fan
- The significance of upkeep cannot be emphasised. Check the wear and strain on the fan belts. noisy fan indicates that the belt is worn out and needs to be changed. To improve air flow, clean the fan blades.It is necessary to lubricate the shutters.
- Reroute the flow of the air circulation fan. Directing all HAF fans to blow from shutter end to fan end is one approach to boost air flow in long homes. This will aid in the quicker movement of air, resulting in increased cooling. In most homes, this entails turning one row of fans around. In order for air to pass from the input shutters to the fans, seal gaps and close doors. This will allow the most amount of air to pass through the crop.
- By putting fans in strategic locations, you can save electricity. As the greenhouse temperature rises, utilise two-stage thermostats or an electronic controller to switch on fans. Keep in mind that the largest-diameter fans with the smallest motors are generally the most energy efficient and produce the most cubic feet per minute per unit of energy input. Select NEMA premium motors with an efficiency of 86 percent when replacing 1 and 1.5 horsepower motors. These motors utilise 8 to 10% less energy than traditional conventional motors.
- Insect screening that is free of insects. To clear dust, leaves, insects, and other items that may clog the small pores, spray water from the inside or vacuum from the outside. Make sure there is enough screen material such that the overall pressure drop in the greenhouse is less than 0.1 inch water static pressure, as measured using a manometer. If this isn’t done, the greenhouses might warm.
- Lower the greenhouse temperature to several degrees below ambient via evaporative cooling. Some farmers have had success with portable evaporative coolers that are simple to put up. Cleaning the pad of dirt and debris is the most important part of fan and pad system maintenance. By draining or bleeding away a portion of the water and adding an algaecide, algal growth can be inhibited. The most common reasons of nozzle obstruction in fog systems are chemical and particle waste, which may be avoided by using rain or filtered water.