Nomenclature Latin symbols M Mass (kg) Q Energy flow (W)

In this work the potential energy saving by adaptation to daily ambient temper-ature differences for frozen cargo in reefer containers are studied using a model of the Star Cool reefer. The objective is to create a controller that can be imple-mented on an embedded system and a range of methods are used to reduce the computational load. A combination of MPC and traditional control is used and the accuracy of the MPC is enhanced with an online update of model parameters. Simulation experiments showing potential energy savings of up to 21 % where the MPC is allowed to control both the cooling capacity and the ventilation of the cargo are. The largest cost reduction is achieved through a reduced ventilation rate