le In contrast to this the gear unit must be tak B4-DV14-B Bevel-helical gearbox B4

Flender/Flender Gear Units/Bevel-helical gearbox B4

ugh the product,rather than just surrounding the produce containers as is done in room cooling. Fans areused to create static pressure difference across the two sides of the product containers(Fig. . This results in the airs being pulled through the containers, thus removing thewarm air around the produce by convection. The static pressure that is created across the produce containers is in the range of 3 to 2 mm of water gauge, with typical value of 1 mm (. Cooling is faster and more uniform as the static pressure used is increased.An airow rate of 0.5 to 3 of air per second per kilogram ( /H1kg/H of warm produce is needed for adequate heat removal (. Fans are selected to operate with thesecriteria for static pressure and airow. The quantity of air that does not pass through the Cooling and Storage 5 Fig. 4 Schematic of forced-air tunnel cooling. produce should be minimized since it does not aid in cooling and results in loss of efciency. Fan manufacturers usually present performance characteristics of their fans in graphic or tabulated form and indicate the optimal range of operation. It is recommended that fan with wide optimal ow rate range or fan run by variable-speed motor bepurchased, if it is expected that the quantities of produce to cool will vary over the season.The fan speed and power requirements are indicated with the performance characteristicsso that an economic analysis based on initial investment and operating costs may be done. The position of containers must be such that the vents that are in adjacent containers are lined up in the direction of ow. These vents should be evenly distributed on the containers to allow for even air distribution throughout the produce (. It is recom-mended that the total area of these vents be at least 5% to 1% of the surface area of thesides of the container ( and that the produce inside the containers not be wrapped so thatoptimal heat transfer conditions can be achieved (. It should be noted