For a moderately shaded greenhouse, the ventilation system should be. Evaporative cooling systems using a combination of evaporative pads and extractor fans require greenhouses to be hermetic. After providing stabile cooling by opening fanpad system, hourly mean temperature and relative humidity along greenhouse from pad to fan ranged between 20. Designed with the grower in mind, these cooling pads and systems will use heat in the air to evaporate water from plants and other wetted surfaces that. Fan and pad greenhouse evaporative cooling systems1 edis. The btu capacity of the heating system equals q the total exposed outside area of the greenhouse sides, ends, and roof in square feet equals a the heat loss factor that quantifies the rate at which heat energy flows out of the greenhouse is equal to. Calculating heating needs heating systems are rated in british thermal units btu per hour h. Fan and pad greenhouse evaporative cooling systems. The most common way of accomplishing evaporative cooling in a greenhouse is with a fan and pad system figure 1. Cropking uses the fan and pad cooling method as their greenhouse cooling system. For a moderately shaded greenhouse, the ventilation system should be designed to be. The fanand pad system can lower the temperature of. Energy efficiency in greenhouse evaporative cooling. Performance analysis of a greenhouse fanpad cooling system.
Nate storey of bright agrotech shows you what a homemade cooling. Fan and pad greenhouse evaporative cooling systems find, read and cite all the research you. Pdf fan and pad greenhouse evaporative cooling systems r. The basis of any evaporative cooling system is the evaporation of water into an airstream. Evaporative cooling, evap pads, greenhouse cooling, humidity relief. Greenhouse heater requirements depend upon the amount of heat loss from the. Cooling system mounted inside the structure most greenhouse applications. An evaporative cooling system is a system which moves air through a screen or spray of water. Fogging systems are still not widely used for greenhouse cooling mainly owing to their low cooling efficiency and high risk of pathogen expansion caused by excess wetness of plant foliage.
Both types of summer evaporative cooling system can reduce the greenhouse air temperature. A glaciercor evaporative wet wall pad, including selfcontained water distribution system no sump tank needed is on the south end of the house. The best time to measure wet bulb temperature to calculate the potential cooling performance of the evaporative cooling system is in the afternoon. Ventilation is required for greenhouse cooling to remove heated greenhouse air and to introduce drier air for evaporative cooling. The following will serve as an example for designing a pad cooling system for a gutterconnected greenhouse. In florida, greenhouse temperatures can easily exceed.