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Flow through calorimeter to measure fluid heat capacity in CSP applications

Hilgert, Christoph and Howar, Fabian and Röger, Marc (2019) Flow through calorimeter to measure fluid heat capacity in CSP applications. Solar Energy, 194, pp. 804-814. Elsevier. DOI: 10.1016/j.solener.2019.11.029 ISSN 0038-092X

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Official URL: https://doi.org/10.1016/j.solener.2019.11.029

Abstract

Performance tests of concentrating solar collectors are based on energy balance studies which require accurate measurements of fluid mass flow rate, temperature difference over the collector length and the knowledge of the specific heat capacity of the used heat transfer fluid (HTF). Especially at operation temperatures in the range of 200–400 °C, the accuracy of HTF manufacturer data regarding the specific heat capacity of used HTFs is insufficient. This shortcoming contributes significantly to the overall measurement uncertainty of thermal collector assessments. In the present paper, the measurement results of a flow through calorimeter measuring the specific heat capacity of SYLTHERM 800 under field conditions at temperatures up to 330 °C are presented. The HTF measurement shows good agreement (deviation below 1.2%) with a Differential Scanning Calorimetry (DSC) measurement for temperatures below 270 °C. For higher temperatures, the deviation between flow through calorimeter and DSC measurement increases to 3.7% at 330 °C. Furthermore, several technical design and measurement improvements over the calorimeter design presented in 2012 are described in detail. A validation measurement using water reveals deviations below 0.1% from the water reference values at ambient temperatures. A stringent uncertainty analysis reveals the largest individual measurement uncertainty. The unexpectedly large uncertainty of the Coriolis mass flow sensors at temperatures above 270 °C is distinguished by a large individual uncertainty and the comparison to DSC.

Item URL in elib:https://elib.dlr.de/130861/
Document Type:Article
Title:Flow through calorimeter to measure fluid heat capacity in CSP applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hilgert, ChristophChristoph.Hilgert (at) dlr.dehttps://orcid.org/0000-0002-9985-7367
Howar, FabianSF-QLFUNSPECIFIED
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Date:13 November 2019
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:194
DOI :10.1016/j.solener.2019.11.029
Page Range:pp. 804-814
Publisher:Elsevier
Series Name:Science Direct
ISSN:0038-092X
Status:Published
Keywords:CSP; Parabolic trough; Thermo-physical properties; Specific heat capacity; Heat transfer fluid; Thermal performance
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2019 15:19
Last Modified:20 Nov 2019 15:19

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