1,721,012 research outputs found
Solares Kühlen & Heizen - aktueller Stand installierter Systeme großer Leistung und ein Ausblick auf neue Gebäude.
No full textExperiences with an innovative energy system: Refurbishment and enlargement of a rationalist building in Italy to a solar active building.
No full textMonitoring activities for the optimization of a tri-generation plant including a solar heating and cooling system.
No full textTrigeneration systems assisted by solar energy: design criteria and off design simulations
Full text linkThe present work focuses on CHCP systems, made up of gas engine as prime mover and absorption chiller as cooling device, combined with Evacuated Tube solar thermal Collectors (ETC). Such an energy system has provided the EURAC building with heating and cooling since 2002 and has been monitored since 2005. Thanks to the monitoring data, critical aspects have been highlighted concerning the size
selection of some components, the overall layout and control strategy (Chapter 1). On the basis of this outcome, a procedure for optimal designing CHCP plus ETC systems has been defined and includes:
1. the layout and the control strategy selection (Chapter 2): beside the already mentioned basic components, the layout also includes a biomass boiler, as a further renewable heat source, and a compression chiller, as a cooling back up device;
2. the definition of a sizing procedure for each component of the layout (Chapter 3): this procedure is based on a spreadsheet which requires the heating and cooling demand of the building and a first sizes selection concerning the absorption chiller, the cogenerator and the solar collectors in order to output the sizes of all the left plant components;
3. the development of a TRNSYS deck which simulates the designed plant at off design conditions (Chapter 5): to this end, two new models have been developed in MATLAB respectively for a gas engine based cogeneration unit and a biomass boiler (Chapter 4).
Such design procedure has been applied in order to select the sizes suitable to match the EURAC heating and cooling demand. On this subject, by repeating the sizing procedure with different initial sizes of the major plants component and by considering different control strategies, various configurations have been output. Such configurations have been simulated in TRNSYS to calculate the Primary Energy Consumptions (PEC), the Operation Costs (OC) and the CO2 emissions which can be saved by the examined system with respect to a conventional system.
By comparing the savings turned out of all the simulations, the optimal size of the cogeneration unit, the biomass boiler, the absorption and the compression chiller have been identified. The obtained results have also been discussed from the point of view of the Discounted Pay Back Period (Chapter 6)
Coupling solar collectors and cogeneration units in solar assisted heating and cooling systems
No full textLC-ESI/LTQOrbitrap/MS/MSn analysis reveals diarylheptanoids and flavonol O-glycosides in fresh and roasted hazelnut (Corylus avellana cultivar “Tonda di Giffoni”)
No full textHazelnut represents one of the most consumed food, containing a large range of bioactive and health-promoting compounds. Investigation of the fatty component of C. avellana nut has been widely carried out, but little is known about its phenolic content. In order to achieve deeper insight into the polar fraction of the n-butanol extracts of both fresh and roasted kernels of C. avellana cultivar, “Tonda di Giffoni” a PGI (Protected Geographical Indication) product of Campania region (Italy), a phytochemical investigation was carried out. High performance liquid chromatography coupled to electrospray ionization, multiple-stage linear ion-trap and orbitrap high-resolution mass spectrometry (LC-ESI/LTQOrbitrap/MS/MSn) profile of the fresh and roasted hazelnut led to the identification of eleven phenolic compounds corresponding to diarylheptanoid derivatives, flavonoid O-glycosides and ellagic acid. Moreover, the antioxidant activity of isolated compounds was evaluated by TEAC assay which showed that ellagic acid and flavonoid derivatives possessed the highest free-radical-scavenging activity
Multi-class polar lipid profiling in fresh and roasted hazelnut (Corylus avellana cultivar “Tonda di Giffoni”) by LC-ESI/LTQOrbitrap/MS/MSn
No full textHazelnuts are a popular tree nut used whole or as an ingredient in a variety of bakery, candy and chocolate products. Based on the nutritional value and nutraceutical properties, mainly due to the lipid content, US Food and Drug Administration has recognized hazelnut as “heart-healthy” food. “Nocciola di Giffoni” is a Protected Geographical Indication (PGI) Italian hazelnut largely consumed but lacking of a comprehensive lipid profile. To acquire a detailed characterization of the polar lipids in fresh and roasted “Nocciola di Giffoni” hazelnut, an extensive analysis based on high-performance liquid chromatography coupled to multiple-stage linear ion-trap and orbitrap high-resolution mass spectrometry (LC-ESI/LTQOrbitrap/MS/MSn) was carried out. This analytical approach (statistically validated) allowed for the detection of a wide range of polar lipids from oxylipins and long chain bases to high molecular weight lipids (phospholipids, sphingolipids, and glycolipids). Most of the polar lipids are here described for the first time in hazelnut
An analytical approach to profile steroidal saponins in food supplements: The case of Ruscus aculeatus
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