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combination with a heat pump. It was estimated that 3800 MWh of surplus heat could be yearly stored in the HT-BTES at 60-65 °C representing a mitigation of carbon dioxide of 1500 t/y. In the second study, researchers within the ongoing German project IAST [24] are analysing the recovery of discontinuous IWH from a foundry furnace in order to be stored in a 10 MWh capacity TES system. This system is composed of a dual-TES media with a packed bed in direct contact with a heat transfer fluid (HTF) at temperatures up to 300 °C. Their objective is to use the stored energy as input heat for different furnace processes and for space heating at temperatures up to 100 °C. The third study was recently carried out by Selvaraj et al. [25], who focused on the use of sand moulds with aluminium shots as TES system to recover the potential waste heat from the solidification process of metal castings. It consisted of preparing sand moulds with aluminium shots surrounding the mould cavity. Most of the shots were close to the cavity and could absorb the heat liberated during the solidification. Afterwards, the heated shots were separated from the mould and passed through a conveyor to an insulation box where they heated by conduction the scrap material. This scrap was further used as input at the furnace, which reduced the energy consumption. It was estimated that at least 6.4% of the waste heat could be recovered and reused by this method. The IWH recovery from the steelmaking processes has focused the attention within the research community since the late 70’s, when the first assessments were started to be published. In 1978, a research work [16,17] studied the IWH recovery and reuse potential from the exhaust hot gases in the primary fume evacuation system from the electric arc steel remelting furnaces of an American scrap metal refining plant. Two packed bed sensible heat TES systems were proposed in order to be used at a temperature range from 315 to 1500 °C in both the operational periods, so to time average the widely fluctuating temperature of the energy source, and in the peaking periods, so to hold energy until the demand arises (Figure 3). The system proposed was expected to save 0.0227 MW per ton of produced steel. Figure 3. Steel electric arc furnace (EAF) energy recovery and storage system, based on [17] 7PDF Image | Thermal Energy Storage TES Industrial Waste Heat Recovery
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