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  • Understanding the greenhouse environment

    By Antonius Lecuona|Published On: January 13, 2019|Last Updated: February 7, 2020|Categories: Greenhouses|Tags: Cooling, Humidity, Temperature, Ventilation|

    The protected greenhouse environment The greenhouse environment is designed to allow plants to perform close to their genetic optimum so that the grower achieves maximum profit. A greenhouse is designed so that the plant converts sunlight, water and CO2 and minerals into marketable yield. Thus the protected greenhouse environment creates a "cozy" climate inside a [...]

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  • pad and fan construction material

    Calculating pad and fan requirements

    By Antonius Lecuona|Published On: May 5, 2013|Last Updated: August 3, 2013|Categories: Cooling, Greenhouses, Systems|Tags: Cooling, Greenhouses, Pad and fan|

    The effectiveness of a pad and fan system will not only depend on the design, but also on the wet bulb temperature outside the greenhouse. It is not the relative humidity, as many grower think that determine the effectiveness of the pad and fan system. The wet bulb temperature will determine to what temperature the [...]

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  • greenhouse cooling lime spray

    Lime – a cheap way to reduce greenhouse temperatures

    By Antonius Lecuona|Published On: May 3, 2013|Last Updated: April 4, 2019|Categories: Cooling, Greenhouses, Systems|Tags: Cooling, Greenhouses, Temperature|

    Cooling a greenhouse can be just as expensive as heating, well almost. There are some very practical methods that you can use to save money.  One of the cheapest methods are spraying the surface of plastic tunnels with soluble lime. Here is how. The surface of the greenhouse cladding should be sprayed [...]

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  • Insect screens in greenhouses – effective biological control

    By Antonius Lecuona|Published On: May 1, 2013|Last Updated: December 30, 2020|Categories: Cooling, Greenhouses|Tags: Cooling, Greenhouses, Insects, Temperature|

    Insect screens or thermal screens are designed to reduce heat in summer and increase temperatures during the night, but also to reduce the number of insects entering the production area. Various designs are available and each type is designed to keep certain insects out by varying the size of the holes and thickness of the material. All insect [...]

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  • Thermal screens greenhouse cooling – are they effective

    By Antonius Lecuona|Published On: May 1, 2013|Last Updated: January 10, 2019|Categories: Cooling, Greenhouses, Systems|Tags: Cooling, Greenhouses, radiation, Temperature|

    Heat is always a problem in greenhouses during summer months and even during winter in some areas. Extreme high temperatures cause stress in plants and reduce yields, quality and increases pest and disease pressure thereby increasing costs. Overall, the economic viability of a greenhouse decreases if temperature is not controlled sufficiently. One of the latest [...]

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  • Evaporative pads – maintenance in commercial hydroponics

    By Antonius Lecuona|Published On: May 1, 2013|Last Updated: January 11, 2019|Categories: Greenhouses|Tags: Cooling|

    The installation of new evaporative pads is expensive. The material should last at least two years if not more. With good regular maintenance, evaporative pads should last 5 years. Fortunately the grower has the opportunity to spend very little money on small items which will increase the lifespan of the evaporative pad. Considering the cost [...]

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  • Cooling a greenhouse with evaporative pad-and-fan

    By Antonius Lecuona|Published On: May 1, 2013|Last Updated: July 31, 2013|Categories: Cooling, Greenhouses, Systems, Ventilation|Tags: Cooling, Greenhouses, Temperature|

    Pad-and-fan systems, also called evaporative pad-and-fan systems, is the most common method of cooling a greenhouse in warm weather regions. Although not optimal, it is better than no cooling at all. Using an evaporative pad-and-fan requires a fan mounted opposite the evaporative pads. Evaporative pad-and-fan systems are referred to as “pad and fan” systems because the [...]

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  • greenhouse fogging nozzles cooling system

    Cooling a greenhouse with fogging nozzles

    By Antonius Lecuona|Published On: May 1, 2013|Last Updated: September 24, 2016|Categories: Cooling, Greenhouses, Systems|Tags: Cooling, Greenhouses, Humidity, Temperature|

    Many growers have tried reducing temperatures (cooling) with fogging nozzles. The concept of spraying the air with microscopic water droplets which absorb the heat in the air sound right. However, fogging does not just decrease the temperature, it increases the humidity as well. A fogging system cannot operate efficiently if it does not have a very [...]

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