1/2/2023 0 Comments Greenhouse cooling pad system![]() ![]() If foot candle values are not available, other units can be used such as “lux” in which the constant (5000) must be replaced with 53819. The factor for light intensity (Flight) can be determined in various ways: The light intensity will influence the amount of energy reaching the greenhouse thus will determine how quickly and to what temperature the greenhouse will be heated. The constant “e” has a value of 2.7182818… A method of calculating the elevation factor (F elev) is provided in the equation below. Air is less dens at higher altitudes, so the elevation must be included in calculations. The elevation of the greenhouse is important since the heat removal capacity of air depends on its weight and not in its volume. ![]() The following data is required in calculating the pad and fan requirements: Although the original calculations were in feet, the formulas have been converted to SI units. The calculations found below are based on those of Ausberger, Bohanon, et al. Thus maintenance of the greenhouse cladding is extremely important when installing a pad and fan system. This is important because the more air is sucked through the wet pads, the higher the efficiency of the pad and fan system. The effectiveness of a pad and fan system will also depend on how air tight the greenhouse is.
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