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The main problem with food delivery service is its long distance. The longer time for food delivery will affect the food's freshness. This paper contributes to utilizing heat energy from motorcycle exhaust for food warming containers. The exhaust energy maintains the temperature of the food delivery container using a heat exchanger concentrically attached to the exhaust pipe. The medium for heat transfer uses water which is closely circulated from the food container and heat exchanger. The analysis was carried out using fluent ANSYS with a kappa-epsilon turbulence model with variation velocity of the inlet flow (0.18 m.s−1, 0.36 m.s−1, 0.54 m.s−1, and 0.72 m.s−1). The initial temperature of the box was 300 K, and the inlet temperature of the box was 333 K. The computation results showed that the higher velocity of inlet flow affects the higher Reynold number. It indicates the greater turbulence of fluid inside the system. The greater turbulent flow enhances the heat transfer rate between the water and the walls of the box. [ABSTRACT FROM AUTHOR]