B4KH-27-C ple HSV with expansion tank motor lantern electr Bevel-helical gear reducers B4

Flender/Flender Gear Units/Bevel-helical gear reducers B4

utting hole in the wall of thestorage room and sealing the open end of larger bag around the perimeter of the hole.The increase or decrease of pressure in the room allows the bag to ll with or empty ofgas. Essentially, it allows the effective volume of the room to increase or decrease, min- imizing the change in pressure. Bags should have 0.3 to 0.4 3of capacity for every 1 m3of room volume (. 4.2 Controlled Atmosphere Storage CA storage implies precise control of the gas concentrations inside the storage room. Modication of atmospheric gas levels may reduce the respiration rate of fresh produce, as well as control the level of ethylene ( 2H and thus retard ripening. The gas concentra- tions of ambient air are 7.0% 2, 2.9% 2, and 0.0% CO 2(. In most CA storage systems, the 2level is decreased and/or the CO 2level is increased. Either generally causes decrease in product respiration rate. Different types of produce respond differentlyto these two gases, and thus the proper atmosphere for given commodity should bepredetermined experimentally. In some cases, ideal concentrations of these gases for long- term storage of one commodity may prove harmful to another. For example, cauliower stored in 1% CO 2at 5C is injured after week in storage, whereas broccoli in the very same environment remains in excellent condition (. Some recommendations of theproper storage requirements are given in Table 1. The choice of CA system to use depends primarily on the gas composition that is 5 Rennie et al. desired and the rate at which it is to be achieved. The standard free volume (SFV) is the ratio of the volume of air to the volume of commodity. The SFV in typical warehousesranges from 1.5 to 3.0 and is function of the stacking arrangement, room geometricalcharacteristics, commodity shape and density, and method of packing, either in bulk orin crates (. CA rooms with higher SFV have more stable gas composition with time but also require more intervention to modif