Abstract:
A heat transfer pipe containing a vaporizable fluid and having a porous wick on its inner surface is mounted in the tank of a railway tank car and extends into a furnace outside the tank. The outer end of the pipe communicated with a reservoir for the fluid. The wick has a plurality of porous metallic layers designed to provide good heat transfer, as well as a high degree of capillary action. Evaporation of the liquid produced by the furnace and condensation along the whole length of the pipe in the tank transfer a great amount of heat into the tank at a generally uniform temperature.
Abstract:
Thermostatically controlled apparatus for heating or cooling air circulated through a closed railway car is modified so that in a temperature zone near the thermostat setting, where in prior systems the heating or cooling would be stopped, the circulated air is cooled and heated simultaneously to reduce humidity or remove moisture from the air. The railway car normally transports fresh fruit or vegetables and the moisture content of the fresh produce may be maintained within a specific range as the air being reintroduced within the car has a moisture content.
Abstract:
A resilient insulating structure on the interior surface of a railway freight car body in contact with lading carried by the car and supporting at least a substantial portion of the lading carried by the car. The resilient insulating structure comprises a layer of polyurethane foam material having its outer surface secured to the inner surface of the metallic car body and an elastomeric inner liner secured to the inner surface of the polyurethane foam material. The polyurethane foam material forms an intermediate cushioning layer for the elastomeric inner liner and is of a thickness at least around 1 inch and may be as great as around 8 inches. The elastomeric inner liner is less than around 1/2 inch thickness and has a stiffness less than the stiffness of the foam material. Some of the energy created by forces exerted by the lading against the resilient insulating structure is dissipated by the deformation of the insulating structure with the remainder of the energy being transmitted to the railway car body through the insulating structure. Upon unusually high local stresses being exerted, such as from a tool or a workman within a car, the intermediate foam layer may be deformed permanently while the elastomeric inner liner in contact with the lading remains undamaged.
Abstract:
A heat transfer pipe containing a vaporizable fluid and having a porous wick on its inner surface is mounted in the tank of a railway tank car and extends into a furnace outside the tank. The outer end of the pipe communicates with a reservoir for the fluid. The wick has a plurality of porous metallic layers designed to provide good heat transfer, as well as a high degree of capillary action. Evaporation of the liquid produced by the furnace and condensation along the whole length of the pipe in the tank transfer a great amount of heat into the tank at a generally uniform temperature.