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Demonstration of EnergyNest Thermal Energy Storage (TES) Technology Nils Hoivik1, a), Christopher Greiner1, Eva Bellido Tirado1, Juan Barragan1, Pål Bergan1, Geir Skeie1, Pablo Blanco2 and Nicolas Calvet2 1EnergyNest AS, Olav Brunborgsvei 6 1396 Billingstad, Norway. 2Masdar Institute of Science & Technology, Institute Center for Energy (iEnergy), Department of Mechanical and Materials Engineering, Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates. a) Corresponding author: nh@energy-nest.com Abstract. This paper presents the experimental results from the EnergyNest 2 x 500 kWhth thermal energy storage (TES) pilot system installed at Masdar Institute of Science & Technology Solar Platform. Measured data are shown and compared to simulations using a specially developed computer program to verify the stability and performance of the TES. The TES is based on a solid-state concrete storage medium (HEATCRETE®) with integrated steel tube heat exchangers cast into the concrete. The unique concrete recipe used in the TES has been developed in collaboration with Heidelberg Cement; this material has significantly higher thermal conductivity compared to regular concrete implying very effective heat transfer, at the same time being chemically stable up to 450 °C. The demonstrated and measured performance of the TES matches the predictions based on simulations, and proves the operational feasibility of the EnergyNest concrete-based TES. A further case study is analyzed where a large-scale TES system presented in this article is compared to two-tank indirect molten salt technology. INTRODUCTION Masdar Institute of Science & Technology and EnergyNest AS have initiated a comprehensive joint research project for building and testing a 2 x 500 kWhth thermal energy storage (TES) pilot. The pilot is based on EnergyNest’s unique TES technology using individual TES elements connected in series and parallel. Each element comprises a solid-state storage medium (HEATCRETE®) with integrated steel tube heat exchangers [1]. The system design is modular, and thereby fully scalable to cater to a wide range of TES capacity requirements. Construction of the TES and piping interface was successfully executed within a 6-month period and completed in May 2015. The hot oil-loop at Masdar Institute Solar Platform (MISP) has been upgraded and instrumented to allow operation with synthetic thermal oil up to 393 °C, the same conditions as in most commercial concentrated solar power (CSP) plants. EnergyNest designed, installed and commissioned the entire TES-system by Oct 2015, after which the first thermal cycles were completed by mid-November. After several further improvement upgrades to the oil loop system early 2016, the TES is operated on a 24 hr / 5 days basis with seven full-time Masdar Institute staff under supervision of EnergyNest. SYSTEM TESTING FACILITY The section of the hot oil-loop at MISP dedicated to perform research and testing of the TES under controlled conditions using Dowtherm-A heat transfer fluid (HTF) is heated by an electrical heater (100 kWel) to reach max temperature of 393 °C under pressurized conditions [2]. Using the electric oil heater and air-cooled oil cooler, the system allows full flexibility in emulating operation conditions in commercial CSP plants; both charging the TES from a solar field and discharging the TES to a power block with a steam turbine generator. The test facility enables SolarPACES 2016 AIP Conf. Proc. 1850, 080011-1–080011-8; doi: 10.1063/1.4984432 Published by AIP Publishing. 978-0-7354-1522-5/$30.00 080011-1PDF Image | EnergyNest thermal energy storage (TES) technology
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