Thermoeconomic Optimization of a Sensible-Heat Thermal-Energy-Storage System: A Complete Storage Cycle

1999 ◽  
Vol 121 (4) ◽  
pp. 286-294 ◽  
Author(s):  
S. M. Zubair ◽  
M. A. Al-Naglah
Keyword(s):  
Heat Transfer ◽  
Temperature Difference ◽  
Storage System ◽  
Unit Cost ◽  
Energy Storage System ◽  
Dimensionless Temperature ◽  
Optimum Number ◽  
Sensible Heat ◽  
Storage Element ◽  
Cost Rate

An analytical model for the second-law-based thermoeconomic analysis and optimization of a sensible-heat-storage system is derived and discussed, in which the storage element is both heated and cooled by flowing streams of gases. In this analysis, monetary values are attached to the irreversible losses caused by the finite temperature difference heat transfer and pressure drop in the storage system. Important dimensionless parameters are identified and the results are presented in terms of the optimum dimensionless charging time θS,opt as a function of a dimensionless temperature difference τ, as well as the optimum number of heat transfer units NTUS,opt, as a function of the dimensionless unit cost per unit heat conductance γUA and τ of the storage systems. The systems analyzed are optimized by introducing a new performance criterion described as the cost rate number, Γ*. Several example problems are also presented and the results are compared with that obtained from Krane’s analysis to illustrate the usefulness of the present approach. The influence of important unit cost parameters on NTUS,opt and θS,opt, are also studied in somewhat more detail.

On Thermoeconomics of a Sensible Heat, Thermal Energy Storage System

1995 ◽  
Vol 117 (3) ◽  
pp. 255-259 ◽  
Author(s):  
M. A. Badar ◽  
S. M. Zubair
Keyword(s):  
Heat Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Optimum Number ◽  
Sensible Heat ◽  
Hot Gas ◽  
Gas Source ◽  
Charging Time ◽  
Thermal Energy Storage System ◽  
Form Model

A closed-form model for the second-law-based thermoeconomic optimization of a sensible heat storage system, in which the energy is stored in a large liquid bath from a hot-gas source, is discussed with an example problem. The results are compared with those obtained from Bejan’s analysis to illustrate usefulness of the present approach. The influence of important parameters on the optimum number of heat transfer units Ntu,opt, and dimensionless charging time θopt, are presented in a graphic form.

Second Law Optimization of a Sensible Heat Thermal Energy Storage System With a Distributed Storage Element—Part 1: Development of the Analytical Model

1991 ◽  
Vol 113 (1) ◽  
pp. 20-26 ◽  
Author(s):  
M. J. Taylor ◽  
R. J. Krane ◽  
J. R. Parsons
Keyword(s):  
Energy Storage ◽  
Analytical Model ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Distributed Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Sensible Heat ◽  
Storage Element ◽  
Thermal Energy Storage System

This study explores the behavior of a flat-slab, sensible heat thermal energy storage system, the physical design and operation of which have been optimized to minimize the production of entropy by thermodynamic irreversibilities. Unlike many previous studies, the present work includes the entropy production by transient heat conduction within the storage element; that is, the analytical model is based on a distributed, as opposed to a lumped, storage element. The work is presented in two parts. The development of the analytical model required to compute the figure of merit, which is called the entropy generation number, in terms of the design and operational parameters of the system is presented in Part I. In Part II, the numerical solution of the analytical model is discussed and the results of an optimization study are presented and interpreted.

Solid Media Thermal Storage Development and Analysis of Modular Storage Operation Concepts for Parabolic Trough Power Plants

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Doerte Laing ◽  
Wolf-Dieter Steinmann ◽  
Michael Fiß ◽  
Rainer Tamme ◽  
Thomas Brand ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Power Plants ◽  
Heat Storage ◽  
Storage Systems ◽  
Storage System ◽  
Sensible Heat ◽  
Economic Optimization ◽  
Parabolic Trough ◽  
Solid Media ◽  
Exergetic Analysis

Cost-effective integrated storage systems are important components for the accelerated market penetration of solarthermal power plants. Besides extended utilization of the power block, the main benefits of storage systems are improved efficiency of components, and facilitated integration into the electrical grids. For parabolic trough power plants using synthetic oil as the heat transfer medium, the application of solid media sensible heat storage is an attractive option in terms of investment and maintenance costs. For commercial oil trough technology, a solid media sensible heat storage system was developed and tested. One focus of the project was the cost reduction of the heat exchanger; the second focus lies in the energetic and exergetic analysis of modular storage operation concepts, including a cost assessment of these concepts. The results show that technically there are various interesting ways to improve storage performance. However, these efforts do not improve the economical aspect. Therefore, the tube register with straight parallel tubes without additional structures to enhance heat transfer has been identified as the best option concerning manufacturing aspects and investment costs. The results of the energetic and exergetic analysis of modular storage integration and operation concepts show a significant potential for economic optimization. An increase of more than 100% in storage capacity or a reduction of more than a factor of 2 in storage size and therefore investment cost for the storage system was calculated. A complete economical analysis, including the additional costs for this concept on the solar field piping and control, still has to be performed.

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