Comparison of Dynamic PTC Thermal Models Using Semi-Analytical and Finite Volume Methods

Date

2018-05-01

Author

Bayer, Özgür

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

300
views

0
downloads

Resource potential estimation of concentrating solar power (CSP) applications with parabolic through collectors (PTC) needs to address time-dependent heat transfer fluid (HTF) temperature at collector field's outlet. HTF temperature distribution depends on several time-dependent variables; i.e., HTF temperature at PTC inlet, direct beam radiation, HTF flow rate and its properties, and PTC parameters, i.e., overall heat transfer coefficient. The present paper develops a time-dependent one-dimensional thermal model for PTCs using the analytical solution of governing partial differential equation assuming time-invariant material properties, inlet temperature, and incident irradiation. Time-dependency component is then integrated into the analytical solution using a time advancing numerical scheme. The results are presented in a generalized non-dimensional form, which features familiar parameters, i.e., NT U. It is shown that in contrast to the developed semi-analytical method, mesh-based methods suffer from an additional error source due to smoothening around t* = 1. As a result, it is also showed that the developed method can use time steps 10 to 25 times larger than mesh-based methods that achieve similar accuracy levels. In addition, developed method's each time-step is found to be about 13 times faster. The combined speed-up is identified as 130-325 for PTC simulations that have high variations in inlet temperature. (C) 2017 American Institute of Chemical Engineers

Subject Keywords

Parabolic Trough Collector, Dynamic Thermal PTC Model, Transient Heat Transfer, Analytical Solution, Non-Dimensional Parameters

URI

https://hdl.handle.net/11511/48609

Journal

ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY

DOI

https://doi.org/10.1002/ep.12773

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Detailed simulations of parabolic trough collector for investigating enhancement of heat transfer to absorber tube flow Uygur, Sinan; Tarı, İlker; Department of Mechanical Engineering (2021-2-12) In this thesis, a detailed method to simulate heat transfer and fluid flow of parabolic trough solar collectors is presented. An optical model of the considered collector is created with Tonatiuh ray tracing program. The data of ray tracing analysis is exported to MATLAB as a binary file for post-processing. Curve fitting and surface fitting to the data are performed to obtain the heat flux distribution on the absorber tube’s outer surface. User-defined functions (UDFs) for ANSYS Fluent Computational Fluid ...
Numerical investigation of circulating fluidized bed riser hydrodynamics for concentrating solar thermal receiver applications Bilyaz, Serhat; Tarı, İlker; Department of Mechanical Engineering (2015) Various heat transfer fluids and thermal storage materials are considered for concentrating solar power systems to improve the storage capability of the system which compensates the fluctuating behavior of the solar resources. Solid particles can be a good alternative since they have high sensible heat capacity. In addition, they are cheap, environmentally benign and chemically and mechanically stable at high temperatures. In this thesis, hydrodynamics of circulating fluidized bed solar receiver was numeric...
Numerical methodology for feasibility analysis of ground source heat pumps Gamage, Kumudu Janani; Uzgören, Eray; Sustainable Environment and Energy Systems (2014-8) Ground source heat pump (GSHP) systems provide an alternative energy source for residential and commercial space heating and cooling applications by utilizing the favorable temperature profile at a certain depth under the ground surface. GSHP’s aftereffects on the ground temperature profile need to be considered for estimating the economical breakeven point. The present study develops a new semi-analytical model to analyze the short term response of the ground heat exchangers by accounting the depth depende...
A system level modeling and performance evaluation of concentrated solar power plant Hasany, Syed Zaid; Uzgören, Eray; Sustainable Environment and Energy Systems (2013-12) This thesis presents a system level study for a solar thermal power plant comprising of parabolic trough collectors (PTC), an organic Rankine cycle (ORC) and a wet cooling tower. A transient numerical model is developed for the PTC accounting the thermal losses and coping up with the intermittent and inherent variable solar input. The transient PTC model is validated with the experimental and numerical results and extended to the double pass counter flow PTC configuration. It is found that there is no signi...
Implementation of metal-based microchannel heat exchangers in a microrefrigeration cycle, and numerical and experimental investigation of surface roughness effects on flow boiling Jafari Khousheh Mehr, Rahim; Okutucu Özyurt, Hanife Tuba; Ünver, Hakkı Özgür; Department of Mechanical Engineering (2015) A microscale vapor compression refrigeration cycle has been constructed for possible application in the thermal management of compact electronic components. The micro-evaporator and micro-condenser components have been fabricated using wire electron discharge machining and micromilling, respectively. Three microevaporators have been manufactured with different surface roughness for the experimental and numerical investigation of roughness effect on nucleate flow boiling in microchannels. In the numerical pa...

Citation Formats

Ö. Bayer, “Comparison of Dynamic PTC Thermal Models Using Semi-Analytical and Finite Volume Methods,” ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY, pp. 1191–1200, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48609.