Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Thermodynamic Model for Compressed Air Motor
Submission Author:
João Batista de Aguiar , SP
Co-Authors:
João Batista de Aguiar
Presenter: João Batista de Aguiar
doi://10.26678/ABCM.ENCIT2022.CIT22-0253
Abstract
Lately engines driven with compressed air have become an important subject of research, even though these engines are not new. First compressed air vehicles were built in Paris between 1838 and 1940. But the small amount of energy stored in the compressed air of a typical tank was considered insufficient for practical use. Nowadays, however, new engines have been proposed, like the one by MDI that developed the Air Pod, a compressed air vehicle equipped with a small engine of 430 cm3, 7 kw power at 1500 rpm, maximum torque of 45 Nm, capable of running 130 km in urban conditions using two tanks of air, each one with 125 l, as claimed. For each inlet condition, a different amount of theoretical work can be obtained, according to the thermodynamic open cycle model. Yet the real work produced in the expansion cycle will differ from the theoretical one, as it depends on the construction elements of the engine. These two questions are considered for single stage processes in this work. A closed cycle approximation model is used to determine the energy exchange, thermodynamic state variables and efficiency. These ideal results are used to qualify the performance announced by Air Pod motor. Discussion of the results for modified models and some improvements are also considered.
Keywords
Thermodynamic Cycle, Model, work output, efficency
