Thermal Operation Maps for Lamm–Honigmann Thermo-Chemical Energy Storage—A Quasi-Stationary Model for Process Analysis
نویسندگان
چکیده
The Lamm–Honigmann energy storage is a sorption-based that can be arbitrarily charged and discharged with both heat electrical power. mechanical charging discharging processes of this are characterized by an internal transfer between the main components, absorber/desorber evaporator/condenser, driven working-fluid mass transferred those components help expansion or compression device, respectively. In paper, thermal operation maps for developed from balances in order to predict power output efficiency depending on system state, which, particular, defined flow rate vapor salt fraction absorbent. conducted method applied pair LiBr/H2O. first step, account second-order losses due transfer; e.g., 0.7 one 0.5 (kg LiBr)/(kg sol.) at temperature 130 °C, it found reversible shaft work reduced 1.1–2.9%/(K driving difference). For lower operating temperatures, reduction larger; 80 loss rises 3.5%/K sol.). second quasi-stationary assumption leads map which characteristics found; °C constant 0.4 kW/m2 exchanger area volumetric inner machine efficiencies ηi=ηvol=0.8 overall heat-transfer coefficient 1500 W/(K m2), has rise continuously 1.5 4.2 g/(s while 97% 83% dilution sorbent. scenario, corresponding discharge time 4.4 (min·m2)/(kg salt). This results exergetic density around 29 Wh/(kg mass). charge-to-discharge ratio 2 (charging times equals two time) same characteristic adiabatic compression, 0.75 kW/m2, resulting round-trip 27%. Besides predictions arbitrary scenarios, derived especially useful dimensioning development control strategies. It noted do not illustrate transient behavior but its state. However, shown, mathematically, tends return state when disturbed.
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ژورنال
عنوان ژورنال: Processes
سال: 2022
ISSN: ['2227-9717']
DOI: https://doi.org/10.3390/pr10050977