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This paper presents a novel concept of acclimatized container to increase people comfort in case of temporary housing. It is based on the ZEBRA concept (Zero Energy Building Renewable Addicted) concept studied by Università of Modena e Reggio Emilia. The original concept developed for industrial building has been extended to mobile metallic housing systems such as the containers transported by trucks which are used for troops and military command during field operations. This system does not require any external source of energy. It requires only the presence of a water well or drilling a hole to place inside a closed loop exchanger which is used to stabilize temperature of internal water which is used as a dynamic thermal barrier which maintains in the wellness conditions inside the mobile housing equipment. Energetic costs of this system are related only to the very reduced energy necessary for water pumping operations.

Most aircraft designers prefer electric engines with open helices rather than ducted fan units. Open propellers often present a higher propulsive efficiency if compared to electric turbofans. High altitudes and rarefied atmosphere evidence this difference. A mathematical model to improve the performances of a ducted fan unit has presented. It aims to align the performances of the two systems by acting on the air intake of the ducted fan. It defines a simplified method for increasing the efficiency of an electric turbofan. It aims to produce a basic and solid mathematical model, which can apply to the study of this propulsion system. CFD simulations have verified the results. Two CFD codes have used to validate the results. An analysis of mesh independence has performed to ensure a better quality of the results. The presented model aims to reach also a methodological result.