DUCTED-AIR HEATING SYSTEMS IN GREENHOUSES: EXPERIMENTAL RESULTS
Temperature distribution was measured in a 64 m long greenhouse during cold nights. Variations of air temperature in length, width and height were recorded and compared with outside air temperatures and the thermostat set temperature. The discharged air temperature gradient along the duct was also measured.
The largest temperature differences were registered between readings taken near the two opposite end walls. Air Temperature was always higher near the heater. The best uniformity was registered along the greenhouse width.