Normalized Thermodynamic Model for Intermittent Energy Systems and Application to Solar-Powered Adsorption Cooling Systems

Taylan, Onur
Baker, Derek Keıth
Kaftanoglu, Bilgin
A new normalized model is developed to quantify and explore trends in coincidence of supply and demand in generic intermittent energy systems as key design and operating parameters are varied. This novel model is applied to seasonal-transient simulations for a solar-thermal powered adsorption system with and without heat recovery to investigate the coincidence between the solar-supplied cooling power and cooling load in terms of seasonal solar and loss fractions. Additionally, the system's basic performance trends are investigated as a number of parameters are varied. Results for the conditions explored include the following. The solar fraction increases and the loss fraction decreases with increases in storage capacity, and both fractions decrease with increases in maximum bed temperature. The required evacuated tube collector area is smaller than the flat plate collector area while the required mass of adsorbent is independent of collector and adsorption cycle types. Simulation results also show the effects of operating conditions and several design parameters on the system's COP.


Aerothermodynamic Design Optimization of Hypersonic Vehicles
Eyi, Sinan; Boyd, Iain D. (American Institute of Aeronautics and Astronautics (AIAA), 2019-04-01)
The objective of this study is to develop a reliable and efficient design optimization method for hypersonic vehicles focused on aerothermodynamic environments. Considering the nature of hypersonic flight, a high-fidelity aerothermodynamic analysis code is used for the simulation of weakly ionized hypersonic flows in thermochemical nonequilibrium. A gradient-based method is implemented for optimization. Bezier or nonuniform rational basis spline curves are used to parametrize the geometry or the geometry ch...
Slip-flow heat transfer in microtubes with axial conduction and viscous dissipation - An extended Graetz problem
Cetin, Barbaros; Güvenç Yazıcıoğlu, Almıla; KAKAÇ, SADIK (Elsevier BV, 2009-09-01)
This study is an extension of the Graetz problem to include the rarefaction effect, viscous dissipation term and axial conduction with constant-wall-heat-flux thermal boundary condition. The energy equation is solved analytically by using general eigenfunction expansion. The temperature distribution and the local Nusselt number are determined in terms of confluent hypergeometric functions. The effects of the rarefaction, axial conduction and viscous dissipation on the local Nusselt number are discussed in t...
Interatomic potentials with multi-body interactions
Haliciogli, T.; Pamuk, H. O.; Erkoç, Sevilay (Wiley, 1988-9-1)
Various model potentials comprising two‐ and three‐body interactions are analyzed comparatively. In this study Tersoff (T), Tersoff‐Dodson (TD), Stillinger‐Weber (SW), and Pearson‐Takai‐Halicioglu‐Tiller (PTHT) potentials are included and their capabilities in reproducing various bulk, surface, and small cluster properties of silicon are investigated. For a proper comparison properties of small Si clusters are also calculated in this work using the PTHT function. Applicability and limitations of each potent...
Analysis of material instabilities in inelastic solids by incremental energy minimization and relaxation methods: evolving deformation microstructures in finite plasticity
MIEHE, CHRISTIAN; LAMBRECHT, MATTHIAS; Gürses, Ercan (Elsevier BV, 2004-12-01)
We propose an approach to the definition and analysis of material instabilities in rate-independent standard dissipative solids at finite strains based on finite-step-sized incremental energy minimization principles. The point of departure is a recently developed constitutive minimization principle for standard dissipative materials that optimizes a generalized incremental work function with respect to the internal variables. In an incremental setting at finite time steps this variational problem defines a ...
Account of nonlocal ionization by fast electrons in the fluid models of a direct current glow discharge
Rafatov, İsmail; KUDRYAVTSEV, A. A. (AIP Publishing, 2012-09-01)
We developed and tested a simple hybrid model for a glow discharge, which incorporates nonlocal ionization by fast electrons into the "simple" and "extended" fluid frameworks. Calculations have been performed for an argon gas. Comparison with the experimental data as well as with the hybrid (particle) and fluid modelling results demonstated good applicability of the proposed model. (C) 2012 American Institute of Physics. []
Citation Formats
O. Taylan, D. K. Baker, and B. Kaftanoglu, “Normalized Thermodynamic Model for Intermittent Energy Systems and Application to Solar-Powered Adsorption Cooling Systems,” INTERNATIONAL JOURNAL OF THERMODYNAMICS, pp. 107–115, 2011, Accessed: 00, 2020. [Online]. Available: