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264 temperature, a TES material was proposed for each stream (Table 8). Assuming a M-TES 265 container energy efficiency of 85% and that two TES containers were charged and discharged 266 every day, results showed that 224 MWh of heat could be delivered each month. This heat could 267 cover the 42 % of the total heat demand. Moreover, a, payback period of 6 years is calculated 268 for the whole system. 265 266 267 Figure 18. 3D model used by Chiu et al. [70] 268 270 Table 8. IWH source from a CHP plant, exit temperature and TES material proposed for 271 an off-site IWH recovery and reuse system [77][78] IWH source Hot water from an accumulator Steam extracted from the high pressure steam turbine (HPST) Steam extracted from the low pressure steam turbine Hot water extracted from the HPST IWH temperature (°C) 90 175 124 140 TES material proposed CH3COONa·3H2O Erythritol Xylitol, Mg(NO3)2·6H2O Erythritol 271 284 Focusing on the studies at pilot plant scale, Wang [77] designed and tested a M-TES system 285 (Figure 19), in which an electrical heater simulated the IWH source during the charging process 286 and a water cycle to simulate the heat demand. The prototype consisted of a 9.15 kWh direct 287 contact system which used 74 kg of PCM (erythritol) and Thermia oil C as HTF. The behaviour 288 of the M-TES prototype at different HTF flow rates (from 5 to 21 l/min) and at different time 289 lengths (from 15 to 210 min) was analysed. Later on, three other studies experimentally 290 analysed different improvements on this configuration. First, Guo et al. [79] investigated the 291 mechanism of melting process to improve the charging performance. Results showed the 292 influence of increasing the HTF flow rate in shortening the charging process time, with 293 reduction of time up to 29 %. On another study, Wang et al. [78] compared the direct and 294 indirect contact container configurations. The charging times are 240 min and 600 min for the 295 direct-contact container system and indirect-contact container system respectively. Finally, Guo 296 et al. [80] analysed the effect of adding quick channels with electric heaters. This mechanism 28PDF Image | Thermal Energy Storage TES Industrial Waste Heat Recovery
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