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Mikkeli, Finland

Savo Solar Oy | Date: 2015-10-15

A solar thermal collector (

Savo Solar Oy | Date: 2015-10-15

A mounting support (

Savo Solar Oy | Date: 2010-04-28

A method for providing a thermal absorber, which can be used in solar thermal collectors. The method includes a step of depositing on a substrate a first layer having a composition that comprises titanium, aluminium, nitrogen, and one of following elements: silicon, yttrium, cerium, and chromium. The method further optionally includes a step of depositing a second layer deposited on the first layer, the second layer having a composition including titanium, aluminium, nitrogen, oxygen and one of the elements of silicon, yttrium, cerium, and chromium, and a step of depositing a third layer having a composition including titanium, aluminium, silicon, nitrogen, and oxygen, the third layer being a top layer of the thermal absorber.

Rebouta L.,University of Minho | Sousa A.,University of Minho | Andritschky M.,University of Minho | Cerqueira F.,University of Minho | And 3 more authors.
Applied Surface Science | Year: 2015

Coatings with a double absorbing layer based on AlSiN/AlSiON were deposited on stainless steel substrates by magnetron sputtering technique, with different Al:Si ratios. A tungsten layer was used as a back reflector and AlSiOy or SiOx thin films were used as antireflection top layers. Prior the structure design, several single layers were deposited on glass substrates by varying the reactive gases flows, which allowed the stacking of a series of layers with different optical properties. Experimental transmittance and reflectance were modelled for the assessment of the spectral optical constants, which were then used to design a coating stack with optimized solar absorptance and thermal emittance. Optical properties, microstructure, morphology, composition and chemical bonding were investigated by employing optical spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The samples were annealed in air at 400 °C and vacuum at 580 °C with the purpose to evaluate their oxidation resistance and thermal stability, which was subsequently correlated with the Al:Si ratio. Optimum results were achieved for an Al:Si ratio of 2.3:1, whereas for significantly higher Si content resulted in detrimental performance. The solar absorbance and thermal emittance for the optimized multilayer selective coatings is 93-94% and 7-10% (at 400 °C), respectively. © 2015 Elsevier B.V. All rights reserved. Source

Reda F.,VTT Technical Research Center of Finland | Viot M.,Savo Solar Oy | Sipila K.,VTT Technical Research Center of Finland | Helm M.,Bavarian Center for Applied Energy Research
Applied Energy | Year: 2016

Thermal cooling systems are particularly attractive in locations supplied by district heating based on cogeneration heating plants (CHP). Moreover, solar thermal energy is a major renewable source for the provision of thermal energy, fulfilling demands for space heating, domestic hot water, process heat, and cooling. This energy source can be suitably used also in Nordic Countries.The presented paper focuses on two configurations of a cooling solar-driven thermal system for an office building located in Finland. Dynamic simulation approach has been used through TRNSYS software. In particular, the configurations differ from the connection between the hot storage tank, the solar collectors and the chiller. Particularly, in the first configuration only the tank can supply the chiller (Case 1), while in the second, the chiller can be supplied either by the tank or the solar collectors directly (Case 2). System performance indexes, in case of district heating as main building heating supply system in winter and as auxiliary heating system for the chiller in summer, have been evaluated as a function of the tank and solar thermal field sizes.Results show that Case 2 has better performance than Case 1, because of the versatility shown in summer. Particularly, when the solar irradiance is low, Case 2 solutions perform far better than Case 1 solutions, benefitting from the direct connection between the solar collectors and the chiller. This study has highlighted also the potential of this technology in cold climate areas supplied by means of DH based on CHP plants. Indeed, the adoption of such cooling technology, in addition to reduce both heating and cooling consumed energy and to shave summer electricity peaks, can potentially allow some CHP plants to operate also in summer, fulfilling the future energy networks aims: being able to provide electricity, heat and cooling energy. © 2016 Elsevier Ltd. Source

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