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greenTEG AG: Heat Flux & Laser Power Sensing
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greenTEG - Heat Flux Sensing and Energy Harvesting
greenTEG - Heat Flux Sensing and Energy Harvesting

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In our latest case study we demonstrate how combined U-value and humidity measurements with the gO Measurement System can be used to detect sources of #mold. Download the case study: http://bit.ly/2G55mVu
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The updated gRAY Laser Power & Position Sensor product brochure is now online. We will also present our latest innovations at Laser World of Photonics this month in Munich.

Download the new brochure with our latest innovations for laser power and position sensing: http://bit.ly/2tjin6S


Be sure to visit us in hall A2, booth 144!

We look forward to meeting you at the fair to discuss your upcoming projects!

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New Publication of Research with gSKIN® Heat Flux Sensors

Scientists at Harvard University used greenTEG’s heat flux sensors in research to improve the design of pores in building materials to efficiently temper incoming fresh air. The research has been published in Energy and Buildings.

Abstract
This study demonstrates how to design pores in building materials so that incoming fresh air can be efficiently tempered with low-grade heat while conduction losses are kept to a minimum. Any base material can be used in principle, so long as it can be manufactured with millimeter-scale air channels. The channel-pores are optimized according to the thermal conductivity of the base material, the dimensions of the panel, and the suction pressure sustained by a given fan or a chimney. A water circuit is integrated at the interior surface to ensure direct thermal contact and prevent radiant discomfort. Correlations from the thermal sciences literature were used to optimize the size and distribution of channel-pores in wood, glass, and concrete test panels. The measurements showed good agreement with theory and were presented in a general form so that designers can predict the steady-state performance of any optimal design in sensible heat-transfer mode. Schlieren imaging was used to characterize the different regimes of mixed convection at the interior and exterior surface. The data explain the discrepancy between prediction and measurement in the dynamic insulation literature, and how the integrated water circuit overcomes these problems. Surface heat-flux measurements were correlated in a general form so that designers can account for convection at the interior and exterior surface.

https://doi.org/10.1016/j.enbuild.2017.05.036



https://www.greenteg.com/new-publication-research-gskin/
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GEAK U-Werte verglichen mit gemessenen U-Werten

An einer Veranstaltung des Forum Energie Zürich vom 07.03.2017 präsentierte Werner Hässig von Hässig Sustech seine Studie, welche die tatsächlich gemessenen U-Werte mit den Werten von GEAK vergleicht. Die Studie kommt zum Schluss, dass manche der GEAK Wert mit 50-60% höher angegeben werden als gemessen, die Wände also tatsächlich besser isolieren als angegeben. Herr Hässig hat für die Studie 100 Messungen mit dem gSKIN® U-Wert Kit von greenTEG durchgeführt. Die Studie wurde unterstützt vom Bundesamt für Energie, Flumroc AG, Isofloc AG, Agitec AG, der Hochschule Rapperswil und der GEAK Betriebszentrale.

Aus Infrarotbildern den U-Wert ablesen?
In einer weiteren spannenden Präsentation hat Christoph Tanner von Baucheck-Tanner die Vor- und Nachteile der thermographischen Analyse vorgestellt. Unter anderem ist er der Frage nachgegangen, ob sich der U-Wert aus Infrarotbildern ablesen lässt. Er kommt zum Schluss, dass mit steigender Dämmung eines Bauteils die Unsicherheit zu U-Wert Aussagen basierend auf Infrarotbildern zunimmt.

Da wo die Unsicherheit sich hingegen in einem akzeptablen Rahmen befindet (bei schlecht isolierten Gebäuden), nützen die Aussagen hingegen oft nichts mehr (da die Ausgangs-U-Werte bei einer starken Aussendämmung relativ wenig ins Gewicht fallen).

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Laser Technik Journal published our application report: Laser Power Monitoring for Improved Process Stability


http://onlinelibrary.wiley.com/doi/10.1002/latj.201790004/full
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