ing coil catalog version side H Flender GmbH F B4KH-16-C Bevel-helical gearboxes B4

Flender/Flender Gear Units/Bevel-helical gearboxes B4

us, corns, and strawberries, respire more than others, such as apples, oranges, and potatoes (Ashby, . Highly perishable produce tends to generate much more respiratory heat. Since respiration rate is higher when produce pulp temperature is higher, more heat is releasedas temperature increases. Values of specic heat, recommended transport temperature, respiration rates, and heat generation of different commodities can be found in references listed in Sec. 2.7.ASHRAE ( also provides heat evolution rates for additional produce. 3.1.2 External Heat Loads The external heat loads include all sources of heat that enter the transport vehicle from the outside. The usual sources of external heat include the heat of conduction, the air inltration, as well as the heat of radiation. Heat is conducted through the oor, walls, and ceiling of transport vehicle when- ever temperature gradient exists between the outside and inside of the vehicle. The amount of heat transferred through conduction is function of the surface area where heat conduction occurs, the type and thickness of insulation within those surfaces, and the temperature difference between the outside and inside of the vehicle. Insulating materialsfor use in transport vehicles should be of moderate cost, easy to apply, and light in weight Transportation and Handling 5 and should have low thermal conductivity, low moisture permeability, and water retention (ASHRAE, . In addition, the insulation should be resistant to re, to breakdown atextreme temperatures, cracking, crumbling, shifting, and vibration or any other types ofmechanical abrasion (ASHRAE, . Insulation used for the vehicle oor should haveenough strength to support forklift or other loading equipment. Any moisture penetration or physical damage decreases the insulation value of the vehicle, and since this normally occurs when transport vehicles age, the amount of conduction heat load is generally higherfor older vehicles. Inltration is one of the la