Abstract
The efficient storing and utilizing of industrial waste heat can contribute to the reduction of CO2 and primary energy. Thermochemical heat storage uses a chemical and/or an adsorption-desorption reaction to store heat without heat loss. This study aims to assess the long-term operational feasibility of thermochemical material based composite honeycombs, so that a new thermochemical heat storage and peripheral system were prepared. The evaluation was done by three aspects: The compressive strength of the honeycomb, heat charging, and the discharging capabilities of the thermochemical heat storage. The compressive strength exceeded 1 MPa and is sufficient for safe use. The thermal performance was also assessed in a variety of ways during 100 cycles, 550 h in total. By introducing a new process, the amount of thermochemical-only charging was successfully measured for the first time. Furthermore, the heat charging capabilities were measured at 55.8% after the end of the experiment. Finally, the heat discharging capability was decreased until 60 cycles and there was no further degradation thereafter. This degradation was caused by charging at a too high temperature (550 °C). In comparative tests using a low temperature (450 °C), the performance degradation became slow, which means that it is important to find the optimal charging temperature.
Highlights
The efficient utilization of industrial waste heat can contribute to the reduction of CO2 emissions, along with primary energy saving
The industrial waste heat produced by the EU has been estimated to be 304.13 TWh/year out of 3200 TWh/year, 25% of waste heat is in the temperature range of 200 and 500 ◦ C and is released into the atmosphere [1,2]
We evaluated the thermochemical material (TCM) honeycombs and thermochemical heat storage during the long-term cycling operation
Summary
The efficient utilization of industrial waste heat can contribute to the reduction of CO2 emissions, along with primary energy saving. The building and service sector, in 2012, in the EU, consumed 50% of EU final energy consumption in the form of heating and cooling, and fossil fuel covered 75% of their demand [3]. In order to reduce fossil fuel significantly, it is an efficient way to collect the industrial waste heat and deliver it to other processes, nearby industries or building/service sector. Thermal energy networks can provide a linkage from producer to customer, establishing a pipeline network requires a lot of investment, and new connections can be made only when a certain amount of demand is always secured. Coordinating the inconsistency between supply and demand is crucial for lowering the Energies 2019, 12, 1262; doi:10.3390/en12071262 www.mdpi.com/journal/energies
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