Air temperature distribution along two greenhouses with different evaporative cooling materials [electronic resource].

Includes references.

An experimental work was conducted on two identical greenhouses 29 m long, 5.5 m wide and 3.9 m high. Each greenhouse was attached to a horizontal evaporative cooling pad, one with a long wheat straw (WS) and the other with an aspen fiber (AF). The dimensions of each cooling pad were 1.22 m wide, 1.52 m high and 5.5 m long. Two suction fans, each one having a diameter of 0.9 m located on the opposite side of the pad for each greenhouse. The air velocities through the pads were ranged between 1- 3.5 m/s. The main objectives of the present work are to: study the air temperature profile of the cooled air along the greenhouse, the effect of cooling down the greenhouse. Eventually, cooling efficiencies were determined for the two evaporative cooling materials under actual conditions. The air temperature reduction due to the evaporative cooling materials was ranged between 5 - 10 oC. The obtained results showed that the temperature differences caused by using the two cooling materials were 2 - 4 oC. The cooling efficiencies were varied between (45 - 75 %) for both materials (WS and AF).

Summary in Arabic.

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