Testing of Solar Thermal Collectors Under Transient Conditions

Osório, Tiago; Carvalho, María Miguel

doi:10.1016/j.egypro.2012.11.148

Cited by 13 publications

(8 citation statements)

References 11 publications

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“…(10), are satisfied, the experimental data are always lower than the predicted ones. This behavior is in line with the literature evidence [12,13] showing that for collectors with a significant concentration ratio, the OSS method is not particularly predictive.…”

Section: S181supporting

confidence: 91%

Design and experimental characterization of a CPC solar collector

Casano¹,

Fossa²,

Stefano³

2017

IJHT

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Medium temperature solar thermal applications have received remarkable interest in the recent years in both residential and industrial sectors. These applications, typically in a temperature range of 80 -250°C, require thermal collectors coupled to solar concentrators. Concerning these applications, a prototype of Compound Parabolic Concentrator coupled to an Evacuated Tube solar collector, was developed and built. The instantaneous efficiency of the prototype was measured according to the suggestions of the European Standard EN 12975-2. The "Outdoor steady-state" test method, well accepted for testing flat plate and evacuated tubular collectors, was used. The specific useful power extracted from the prototype was also derived. The measured performance is in line with theoretical derivations. However, when using the instantaneous efficiency of the Outdoor steady state test method some discrepancies arise in simulating the daily behavior of the collector, suggesting a different testing approach.

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Section: S181supporting

confidence: 91%

Design and experimental characterization of a CPC solar collector

Casano¹,

Fossa²,

Stefano³

2017

IJHT

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“…This helps to reduce costs, to increase the accuracy of research and the number of controlled impact factors and performance of tests regardless of weather conditions [5,10]. In practice, quasi-stationary methods are generally implemented which use dynamic models with average values of SC temperatures and heat capacity [5,11]. It is known that the highest accuracy and simple procedure for solar radiation parameters measurement are provided by calibrated electrical substitution radiometers (calorimeters) [12].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Experimental studies of temperature channel efficiency for solar energy systems

Vasylykha

Yatsuk

Zdeb

et al. 2017

EEJET

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“…In [15], a mathematical model is described that compares the quasi-dynamic test (QDT) and the steady-state test (SST) in five different types of collectors. In [16], the authors present a dynamic model for the collector field and a steady-state model for the power plant; this paper is based on a real PTC solar plant and the whole plant has been mathematically modeled.…”

Section: Modeling Of the Htf-heating Processmentioning

confidence: 99%

“…Figure 12 shows all the thermal exchanges involved in the different parts of the SCE (mirrors, absorber tube, HTF) with the environment. Some of those losses are negligible when compared to others [15][16][17]. This is the case of conduction and convection losses between the outer wall of the metallic tube and the inner wall of the glass cover (thanks to the vacuum created between them), or of conduction thermal losses produced in the walls of the tubes to mention a few.…”

mentioning

confidence: 99%

Dynamic Modeling of the Solar Field in Parabolic Trough Solar Power Plants

Barcia

Menéndez²,

Esteban

et al. 2015

Energies

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Parabolic trough solar power plants use a thermal fluid to transfer thermal energy from solar radiation to a water-steam Rankine cycle in order to drive a turbine that, coupled to an electrical generator, produces electricity. These plants have a heat transfer fluid (HTF) system with the necessary elements to transform solar radiation into heat and to transfer that thermal energy to the water-steam exchangers. In order to get the best possible performance in the Rankine cycle and, hence, in the thermal plant, it is necessary that the thermal fluid reach its maximum temperature when leaving the solar field (SF). Also, it is mandatory that the thermal fluid does not exceed the maximum operating temperature of the HTF, above which it degrades. It must be noted that the optimal temperature of the thermal fluid is difficult to obtain, since solar radiation can change abruptly from one moment to another. The aim of this document is to provide a model of an HTF system that can be used to optimize the control of the temperature of the fluid without interfering with the normal operation of the plant. The results obtained with this model will be contrasted with those obtained in a real plant.

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Testing of Solar Thermal Collectors Under Transient Conditions

Cited by 13 publications

References 11 publications

Design and experimental characterization of a CPC solar collector

Design and experimental characterization of a CPC solar collector

Experimental studies of temperature channel efficiency for solar energy systems

Dynamic Modeling of the Solar Field in Parabolic Trough Solar Power Plants

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