E-resources
Peer reviewed
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Kocak, Burcu; Paksoy, Halime
Solar energy, 11/2020, Volume: 211Journal Article
Display omitted •Laboratory scale packed bed TES was developed to store heat at medium temperatures.•The new STESM developed from demolition wastes was used as packing material.•Demolition waste as STESM was more efficient and cheaper than alternatives.•The results from lab-scale packed-bed with new STESM will be valuable for scaling up. Thermal energy storage (TES) is essential for cost-effective use of solar energy in industries. The most energy intensive processes in industry operate below 200 °C. This study tested a new sustainable and low-cost sensible thermal energy storage material (STESM) based on demolition wastes in a lab-scale packed bed TES system, specifically built to analyze its performance in industrial solar applications below 200 °C. This system was investigated both experimentally and numerically under different operating conditions. One-dimensional continuous phase model used verified that experimental results were in good agreement with numerical ones during charging and discharging steps. Performance of demolition waste STESM was compared with Therminol 66 synthetic oil as a liquid heat storage media. The maximum system energy efficiency of the packed-bed filled with demolition waste STESM was 67% at charging temperature of 150 °C and superficial fluid velocity of 0.95 mm s−1, while it was 63% for Therminol 66. Packed bed TES system with demolition waste STESM showed good performance up to 180 °C in fully laminar flow regime (Rep < 10) and Bi number < 0.1. The material cost of demolition waste STESM is at least tenfold cheaper than the alternative natural rock based packing materials. Packed bed TES systems using demolition wastes can be recommended for low cost and sustainable solar applications in industry.
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