Abstract
For the valorization of industrial waste heat, the implementation of a thermal heat storage becomes essential. Since the waste heat fields show fluctuations in operating conditions, such as temperature and flow rate, a thermal energy storage must be able to accommodate these variations, by storing and then releasing this heat at constant temperature and flow rate. The aim of such a storage is to make the best use of the waste heat from industry. An industrial-scale high-temperature air/ceramic horizontal thermocline thermal energy storage (Eco-Stock®) has been tested through different operating parameters. The objective is to measure the influence of temperature and flow rate variations on the storage performance, in order to simulate a real heat ceramic process. The results revealed that the Eco-Stock® is able to store degraded heat fields and to restore heat at the average temperature of the heat field. As long as the characteristic time is an order of magnitude less than the charging time, the thermocline storage has a good energy performance. Despite gradual variations in temperature and flow rate during the charging process, the storage yield remains high and close to the reference storage (charging temperature of 525 °C). Indeed, it reaches 66% for an outlet temperature of 350 °C for all the temperature tests. For scenarios where the flow rate varies, the yield reaches up to 73.5% at 420 °C. When heat is supplied from a ceramic manufacturing process, the Eco-Stock® can achieve a yield of 68%, which is 5.5% less than the reference case. In addition, the numerical model predicts the storage performance very accurately, proving its ability to absorb high temperature and flow rate constraints.
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