Abstract
The impact of technological downtime during the reloading of isothermal containers on the economic efficiency of temperature-sensitive cargoes multimodal transportation was investigated. The features of the cold chain functioning are considered in the conditions of maritime and rail transport interaction, where the reloading process is tracked by a temporary loss of power supply to containers. The mathematical model of non-stationary heat transfer has been developed, taking into account the interaction of the "environment - container - cargo" system and allows to assess the change in temperature over time. The modeling was performed for different cargo types (chilled beef, poultry, seafood) taking into account seasonal factors, in particular summer and winter operation conditions. The exponential nature of temperature changes have been established and the maximum time for containers to remain without power supply have been determined. An approach to the economic assessment of losses based on the relationship between temperature deviations, the duration of their impact and the reduction in product quality is substantiated. It has been shown that even short-term downtime can lead to significant economic losses associated with decrease in goods commodity value. It has been confirmed that ensuring continuity of temperature control and optimizing reloading operations are the key factors in increasing efficiency of multimodal transportation.

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