Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11026432 | Energy | 2018 | 13 Pages |
Abstract
This article presents the experimental results of a novel energy storage system that combines CAES (Compressed Air Energy Storage) with PHES (Pumped Hydro Energy Storage) technologies. As a reference, we called this system PH-CAES. In this alternative solution two storage tanks, the first with compressed air and the second with water, are separated by a valve. When electric power is required, the valve is opened and water flows to a Pelton turbine, which is coupled to an electric generator. Water from the Pelton turbine is discharged into a third tank. To store energy and recover the initial state, water is pumped back. We built a prototype to assess the PH-CAES performance, with focus on the power generation system. Experimental conversion efficiency was 45%, whilst the rational efficiency remained close to 30%. We also presented a discussion based on the second law of thermodynamics to show that there is a compromise between tanks exergies that maximizes the system performance. We also provide an operating map of this PH-CAES system to assist authors on new studies about this novel technology.
Related Topics
Physical Sciences and Engineering
Energy
Energy (General)
Authors
Tomás P.L. Camargos, Daniel L.F. Pottie, Rafael A.M. Ferreira, Thales A.C. Maia, Matheus P. Porto,