Direct Contact Latent Heat Storage for Efficiency Enhancement of Heat PumpsWith an innovative concept for the storage of thermal energy at low and constant temperature levels, solar thermal energy can be used effectively in transition and winter periods. Furthermore, the solar energy can be stored to increase the efficiency of heat pumps. A latent heat storage system based on salt hydrates is introduced, where the salt hydrate has a melting point of 15°C and is in direct contact with an immiscible heat transfer fluid generating a high charging and discharging capacity. Initial experimental results and application examples are presented and discussed.
In this study, we present an efficient and innovative method to visualize absorption differences in the mid-infrared range with spatial resolution using laser technology. We focus on only two lasers with wavelengths between 3.4 μm and 3.6 μm and a spatial resolution of 20 μm and thus achieve a scanning speed up to 300 kS/s for fast image generation. In this article, we focus especially on the detection of C–H bands in this region of the absorption spectrum. Concealed structures are examined by calculating the measured structures with both wavelengths. In our results, we demonstrate exemplary measurements on 130-μm-thick polyvinyl chloride layers. In turn, these structures are suitable for further processing in rapid quantitative quality control.
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