Thermal processes in a stack of perishable goods transported in a heated insulated wagon
DOI: 10.17586/1606-4313-2025-24-3-38-48
UDC 629.06
Moiseev Vladimir I., Voron Oleg A., Skolov Andrey V., Starovoytov Sergey V.
Keywords: perishable foodstuffs, isothermal wagon, mathematical model, thermal accumulator, heat storage material, underfloor heating, cargo compartment.
UDC 629.06
Thermal processes in a stack of perishable goods transported in a heated insulated wagon
For citation: Moiseev V.I., Voron O.A., Skolov A.V., Starovoitov S.V. Thermal processes in a stack of perishable goods transported in a heated insulated wagon. Journal of International Academy of Refrigeration. 2025. No 3. p. 38-48. DOI: 10.17586/1606-4313-2025-24-3-38-48
Abstract
When transporting perishable goods by rail, there is a significant range of products for which precise temperature control in the cargo area is not required in winter. A mathematical model of heat treatment for a stack of perishable foodstuffs is presented, which describes the processes of heat transfer during prolonged transportation in a heated insulated wagon. The heating system includes the use of electric heating elements and a block of thermal accumulators with a large equivalent heat capacity provided by phase-reversal reactions in the heat storage material. The operation of the wagon heating system is reduced to compensation of heat loss, depending on the ambient temperature and on the thermal insulation qualities of the enclosing structures of the wagon body. A distinctive feature of the proposed model is taking into account the nature of the movement of heat-treated air inside the cargo compartment of an insulated wagon. It is designed to calculate temperature fields in a stack of thermosensitive cargo and a wall space with natural air convection inside the cargo compartment of the wagon. The research methods are based on the equations of mathematical physics and the theory of similarity. The results obtained are exemplified by rolling stock operating for the transportation of perishable goods. Some correction of the temperature regime is provided by heating systems located in the walls and underfloor heatingof the freight car, creating a natural convection of air flowing around the stack. Due to the use of the new heating system and the abandonment of the duct, the height and useful volume of the cargo compartment of the insulated wagon can be increased without changing the external dimensions of the body, which is especially important for LNG transportation with a low specific gravity.
Abstract
When transporting perishable goods by rail, there is a significant range of products for which precise temperature control in the cargo area is not required in winter. A mathematical model of heat treatment for a stack of perishable foodstuffs is presented, which describes the processes of heat transfer during prolonged transportation in a heated insulated wagon. The heating system includes the use of electric heating elements and a block of thermal accumulators with a large equivalent heat capacity provided by phase-reversal reactions in the heat storage material. The operation of the wagon heating system is reduced to compensation of heat loss, depending on the ambient temperature and on the thermal insulation qualities of the enclosing structures of the wagon body. A distinctive feature of the proposed model is taking into account the nature of the movement of heat-treated air inside the cargo compartment of an insulated wagon. It is designed to calculate temperature fields in a stack of thermosensitive cargo and a wall space with natural air convection inside the cargo compartment of the wagon. The research methods are based on the equations of mathematical physics and the theory of similarity. The results obtained are exemplified by rolling stock operating for the transportation of perishable goods. Some correction of the temperature regime is provided by heating systems located in the walls and underfloor heatingof the freight car, creating a natural convection of air flowing around the stack. Due to the use of the new heating system and the abandonment of the duct, the height and useful volume of the cargo compartment of the insulated wagon can be increased without changing the external dimensions of the body, which is especially important for LNG transportation with a low specific gravity.
Keywords: perishable foodstuffs, isothermal wagon, mathematical model, thermal accumulator, heat storage material, underfloor heating, cargo compartment.
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