B2-CH-15B ew tables Type B Nominal power ratings of gear un Bevel-helical speed reduction gearbox B2

Flender/Flender Gear Units/Bevel-helical speed reduction gearbox B2

Mechanical humidiers, spray nozzles, or steam systems may also be used toincrease the humidity in the storage room (. Pressure-atomized or heat-vaporized water can be added to the room to add moisture. rate of 4 water /H1per ton of refrigerant should be adequate to maintain relative humidity of 9% (. These systems are anadded expense and require additional maintenance. Systems that have lot of condensationon the evaporator coils need to be defrosted often, since the buildup of frost or ice on thecoils results in decreased refrigeration capacity. 1.1.3 Atmospheric Composition The deterioration of harvested produce can further be reduced by limiting the available oxygen in the storage atmosphere, usually in combination with maintaining higher carbondioxide levels. This can be done by active means (controlled atmosphere storage [CA])or passive means (modied atmosphere [MA] storage). It is generally accepted that lim-iting the 2supply reduces the respiration rate by approximately 5% at temperatures of 2Ct o2 5C (. If the product is refrigerated, the additional reduction due to low temper- ature is approximately 2%. These are equivalent to storage life increases of 1% and 3%, respectively, under the two temperature regimes (. Higher CO 2concentrations in the storage enclosure can also inhibit the respiration mechanism, however, some commodi-ties are sensitive to higher-than-ambient CO 2concentrations and can develop off-odors, discoloration, and other disorders (. Therefore the type of system used to provide optimalconditions is dependent on the commodity. Finally, the control of ethylene ( 2H sa important consideration in the storage of certain commodities (see Chapter 1 for review of the role of this gas). 2 PRECOOLING Cooling is the process of removing heat. The rate of cooling of product is often referred to as its 1/2 cooling rate . The 1/2 cooling rate is the time required to reduce the difference Cooling and Storage 5 between the mean tempera