VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Fatigue resistant elastocaloric regenerative cooler / heat pump showing high performance [Elektronski vir]
    DallʹOlio, Stefano ...
    Due to the high global warming potential of refrigerants in the short and long term, the refrigeration community is looking for a reliable alternative technology that could replace the current ... dependency on vapor compression systems. A valuable alternative technology should be highly efficient and environmentally friendly. Recently, devices based on the elastocaloric effect (eCE) proved to be one of the most promising candidates to replace vapor compression cooling and heating systems in the following years. The elastocaloric cooling is based on the elastocaloric effect (eCE), which is closely related to the superelasticity of shape memory materials. In the specific case of shape memory alloys, which are the most studied elastocaloric materials (eCM), the eCE occurs due to a stress-induced martensitic transformation. When an external force is applied to an eCM, the transformation from an austenitic to a martensitic phase occurs. This is an exothermic transformation that leads to the release of latent heat and thus to the heating of the eCM under adiabatic conditions. During unloading, the endothermic reverse martensitic-austenitic transformation occurs, leading to the absorption of the latent heat, causing the material to cool below its initial temperature, under adiabatic conditions. In our recent work [1] we developed an elastocaloric cooling and heat-pumping device that showed outstanding specific performance compared to the existing caloric devices. It is based on the concept of an active elastocaloric regenerator made of Ni-Ti tubes loaded in compression. It has the shape of a shell-and-tube heat exchanger and consists of eighteen 56 mm long tubes, equivalent to only 13.7 g of eCM. The regenerator can operate in both cooling and heat-pumping modes and shows durable operation and record performance with a maximum temperature span of more than 31 K at zero thermal load and a heating power of more than 60 W, equivalent to 4,400 W per kg of eCM at a temperature span of 10 K. The best performance was obtained at a frequency of 2 Hz and a stress level of 825 MPa. In this talk we will present the performance of our elastocaloric regenerator, its main characteristics and the research behind the development of the device. In particular, we will focus on the optimization process of the critical areas of the regenerator: the flow distribution inside the regenerator, the displaced fluid volume ratio, the dead volume and the heat transfer losses to the ambient. Moreover, motivated by the excellent results we have obtained with a single elastocaloric regenerator, we are designing a more complex and compact prototype device with four phase-shifted regenerators including a force recovery mechanism, to increase the total cooling/heating power with respect to a single regenerator and to reach a performance comparable to that of a small conventional cooling/heat-pumping unit.
    Vir: 2023 MRS Spring Meeting & Exhibition [Elektronski vir] : April 10-14, 2023, San Francisco, California, virtual (1 spletni vir)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 150908419

    Povezava(-e):

    https://mrs.digitellinc.com/mrs/sessions/37786/view
    https://www.mrs.org/meetings-events/spring-meetings-exhibits/2023-mrs-spring-meeting/call-for-papers/presentations?page=1&categories=&symposium=&sessiontype=&topicalcluster=&sessiondate=&s=jaka+tu%C5%A1ek

Vnos na polico