Thermal Loads on Solar Collectors and Options for their Reduction

Reiter, Christoph; Trinkl, Christoph; Zörner, Wilfried

doi:10.1002/9783527659609.ch5

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…The temperature of the casing increased from 12°C up to only 35°C, while the ambient air temperature was between 9°C and 14°C. (Reiter et al 2012) There is also high absorber dynamics at ambient temperatures near to the freezing point in winter. The temperatures of the components of the dry collector were below 5°C (10:45 a.m.).…”

Section: Detailed Field Testing Resultsmentioning

confidence: 99%

“…The maximum temperature lay at 86°C, also an uncritical level for most polymeric cover sheet materials. Reiter et al 2012) For the investigation of the frame temperatures, several sensors were positioned on the inner surface of the aluminum frame by rivets, outside the collector insulation. The sensor used for the analysis of the collector in the system was located at the upper side of the collector near the outlet (Figure ; right picture).…”

Section: Report B9mentioning

confidence: 99%

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IEA-SHC Task 39 INFO Sheet B9 - Thermal loads at components of state-of-the-art flat-plate collectors

Reiter¹

2015

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Section: Detailed Field Testing Resultsmentioning

confidence: 99%

Section: Report B9mentioning

confidence: 99%

IEA-SHC Task 39 INFO Sheet B9 - Thermal loads at components of state-of-the-art flat-plate collectors

Reiter¹

2015

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“…The model was validated using the parameter set of a tested conventional flat-plate collector. The validation of this model and physical effects is also adequate for models with implemented overheating protection measures or adjusted build-up since the defined physical effects are varied and not exchanged [1,30]. The model was tested in various settings to investigate the accuracy of the results.…”

Section: Heat Conductionmentioning

confidence: 99%

A Dynamic Multinode Model for Component-Oriented Thermal Analysis of Flat-Plate Solar Collectors

Reiter

Trinkl

Zörner

et al. 2015

Journal of Solar Energy

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A mathematical model of a flat-plate solar collector was developed on the basis of the physical principles of optics and heat transfer in order to determine collector’s component temperatures as well as collector efficiency. In contrast to many available models, the targeted use of this dynamic model is the detailed, theoretical investigation of the thermal behaviour of newly developed or adjusted collector designs on component level, for example, absorber, casing, or transparent cover. The defined model is based on a multinode network (absorber, fluid, glazing, and backside insulation) containing the relevant physical equations to transfer the energy. The heat transfer network covers heat conduction, convection, and radiation. Furthermore, the collector optics is defined for the plane glazing and the absorber surface and also considers interactions between them. The model enables the variation of physical properties considering the geometric parameters and materials. Finally, the model was validated using measurement data and existing efficiency curve models. Both comparisons proved high accuracy of the developed model with deviation of up to 3% in collector efficiency and 1 K in component temperatures.

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“…Figure 1 shows the potential mechanisms that can reduce the optical efficiency of a collector. Reiter et al 2012) In addition to these measures, the removal of excess thermal energy is a further option, which could be realized either by increased thermal losses of the solar collector or by active cooling. Figure 2 shows the various modes of removal of thermal energy which can be applied in the collector or in the solar-thermal system.…”

Section: Principles For Overheating Protection Measuresmentioning

confidence: 99%

“…Figure 2: Overview of mechanisms and solutions for the removal of excess thermal energy (according to Reiter et al 2012) …”

Section: Reduction Of Absorbing Areamentioning

confidence: 99%

IEA-SHC Task 39 INFO Sheet B4 - Overheating protection

Reiter¹,

Brandmayr²,

Trinkl³

et al. 2015

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Thermal Loads on Solar Collectors and Options for their Reduction

Cited by 3 publications

References 4 publications

IEA-SHC Task 39 INFO Sheet B9 - Thermal loads at components of state-of-the-art flat-plate collectors

IEA-SHC Task 39 INFO Sheet B9 - Thermal loads at components of state-of-the-art flat-plate collectors

A Dynamic Multinode Model for Component-Oriented Thermal Analysis of Flat-Plate Solar Collectors

IEA-SHC Task 39 INFO Sheet B4 - Overheating protection

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