In this paper we report the results of a numerical investigation focused on the evaluation of the most suitable conditions to make it work efficiently, with respect to the crucial parameters like the frequency of the cycle and fluid velocity vs variable lengths of the wires of a single bunch of elastocaloric elements to be employed in SUSSTAIN-EL. SUSSTAIN-EL will be the first Italian elastocaloric device for cooling and it is being developed by University of Naples Federico II, as a goal of the SUSSTAINEBLE project. The prototype is designed to be rotary and formed by bunches of elastocaloric wires crossed by air as heat transfer fluid. This paper introduces a two-dimensional model carrying the following originalities with respect to the other tools already published in literature: the 2-D design and possibility of reproducing step by step the velocity and the pressure field of fluid, to predict more accurately the solid-to-fluid heat exchange. The revealed trade-off between the maximization of temperature span and cooling power suggests the choice of 0.119 Hz and 7 m s−1 as cycle frequency and air flow velocity. The effect of the length is remarkable from 100 mm to 200 mm but not so noticeable for a further increment of 100 mm.
The optimization of the energy performances of a single bunch of elastocaloric elements to be employed in an experimental device / Cirillo, L.; Rosaria Farina, A.; Greco, A.; Masselli, C.. - In: THERMAL SCIENCE AND ENGINEERING PROGRESS. - ISSN 2451-9049. - 27:(2022), p. 101152. [10.1016/j.tsep.2021.101152]
The optimization of the energy performances of a single bunch of elastocaloric elements to be employed in an experimental device
Cirillo L.;Greco A.;Masselli C.
2022
Abstract
In this paper we report the results of a numerical investigation focused on the evaluation of the most suitable conditions to make it work efficiently, with respect to the crucial parameters like the frequency of the cycle and fluid velocity vs variable lengths of the wires of a single bunch of elastocaloric elements to be employed in SUSSTAIN-EL. SUSSTAIN-EL will be the first Italian elastocaloric device for cooling and it is being developed by University of Naples Federico II, as a goal of the SUSSTAINEBLE project. The prototype is designed to be rotary and formed by bunches of elastocaloric wires crossed by air as heat transfer fluid. This paper introduces a two-dimensional model carrying the following originalities with respect to the other tools already published in literature: the 2-D design and possibility of reproducing step by step the velocity and the pressure field of fluid, to predict more accurately the solid-to-fluid heat exchange. The revealed trade-off between the maximization of temperature span and cooling power suggests the choice of 0.119 Hz and 7 m s−1 as cycle frequency and air flow velocity. The effect of the length is remarkable from 100 mm to 200 mm but not so noticeable for a further increment of 100 mm.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
