title: Experimental and Numerical Investigation of Combined Sensible/Latent Thermal Energy Storage for High-Temperature Applications.
abstract: Combined sensible/latent heat storage allows the heat-transfer fluid outflow temperature during discharging to be stabilized. A lab-scale combined storage consisting of a packed bed of rocks and steel-encapsulated AlSi(12) was investigated experimentally and numerically. Due to the small tank-to-particle diameter ratio of the lab-scale storage, void-fraction variations were not negligible, leading to channeling effects that cannot be resolved in 1D heat-transfer models. The void-fraction variations and channeling effects can be resolved in 2D models of the flow and heat transfer in the storage. The resulting so-called bypass fraction extracted from the 2D model was used in the 1D model and led to good agreement with experimental measurements.
authors: Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.
authors: Lukas
authors: L
authors: Geissbühler
authors: Department of Innovative Technologies, SUPSI, CH-6928 Manno, Switzerland.
authors: Simone
authors: S
authors: Zavattoni
authors: Department of Innovative Technologies, SUPSI, CH-6928 Manno, Switzerland.
authors: Maurizio
authors: M
authors: Barbato
authors: Airlight Energy Manufacturing SA, Via Industria 10, CH-6710 Biasca, Switzerland.
authors: Giw
authors: G
authors: Zanganeh
authors: Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland. haselbac@ethz.ch.
authors: Andreas
authors: A
authors: Haselbacher
authors: Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.
authors: Aldo
authors: A
authors: Steinfeld