skip to main content

DOE PAGESDOE PAGES

Title: Dynamic analysis of concentrated solar supercritical CO2-based power generation closed-loop cycle

Here, the dynamic behavior of a concentrated solar power (CSP) supercritical CO 2 cycle is studied under different seasonal conditions. The system analyzed is composed of a central receiver, hot and cold thermal energy storage units, a heat exchanger, a recuperator, and multi-stage compression-expansion subsystems with intercoolers and reheaters between compressors and turbines respectively. Energy models for each component of the system are developed in order to optimize operating and design parameters such as mass flow rate, intermediate pressures and the effective area of the recuperator to lead to maximum efficiency. Our results show that the parametric optimization leads the system to a process efficiency of about 21 % and a maximum power output close to 1.5 MW. The thermal energy storage allows the system to operate for several hours after sunset. This operating time is approximately increased from 220 to 480 minutes after optimization. The hot and cold thermal energy storage also lessens the temperature fluctuations by providing smooth changes of temperatures at the turbines and compressors inlets. Our results indicate that concentrated solar systems using supercritical CO 2 could be a viable alternative to satisfying energy needs in desert areas with scarce water and fossil fuel resources.
Authors:
 [1] ;  [2] ;  [3]
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Mechanical Engineering, Energy and Sustainability Center, Center for Advanced Power Systems; Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Florida State Univ., Tallahassee, FL (United States). Dept. of Mechanical Engineering, Energy and Sustainability Center, Center for Advanced Power Systems
Publication Date:
Report Number(s):
INL/JOU-15-36901
Journal ID: ISSN 1359-4311; PII: S1359431115010868
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Applied Thermal Engineering
Additional Journal Information:
Journal Volume: 93; Journal Issue: C; Journal ID: ISSN 1359-4311
Publisher:
Elsevier
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 14 SOLAR ENERGY; Concentrating Solar Power; Dynamic analysis; Efficiency; Supercritical CO2; Thermal Energy Storage
OSTI Identifier:
1357496