A low-temperature glide cycle for pumped thermal energy storage

نویسندگان

چکیده

Pumped thermal energy storage is seen as a possible alternative to pumped-hydro schemes for storing electricity at large scale and facilitating increased integration of renewable sources. This paper presents novel form pumped in which the thermodynamic cycle exploits temperature glide exhibited by zeotropic mixtures. The working fluid blend linear alkanes, optimised so obtain near-constant effective heat capacity two-phase region. enables exchange with manner that incurs very low exergetic losses whilst also achieving high work ratio. These two features allow attain respectable round-trip efficiency operating (0–100 °C). analysis presented constitutes preliminary design; further improvements performance may be comprehensive optimisation. Nonetheless, results show an overall (electricity-to-electricity) around 50% should achievable unpressurised water fluid. Initial cost estimates have been undertaken, showing marginal (capital) costs range 15–45 $/kWhe, depending on type containment. Due power density heat-to-work ratio low-temperature storage, estimated capital per unit less favourable (1,300–2,900$/kW) implying system best-suited long-duration discharge.

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ژورنال

عنوان ژورنال: Journal of energy storage

سال: 2021

ISSN: ['2352-1538', '2352-152X']

DOI: https://doi.org/10.1016/j.est.2021.103038