15 research outputs found

    An谩lisis del efecto de materiales de cambio de fase sobre la demanda de calefacci贸n en una casa fotovoltaica

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    CIES2020 - XVII Congresso Ib茅rico e XIII Congresso Ibero-americano de Energia SolarRESUMEN: Este trabajo eval煤a el efecto que tiene la integraci贸n de materiales de cambio de fase (MCF) en la envolvente de los edificios, sobre la operaci贸n de un sistema de generaci贸n solar fotovoltaica acoplado con bomba de calor para cubrir las necesidades t茅rmicas de dicho edificio. A partir de una instalaci贸n a escala real, se han realizado modelos en EnergyPlus de diferentes escenarios de estudio intermedios, teniendo en cuenta que la aplicaci贸n de los MCF microencapsulados como revestimiento de paredes interiores, requiere de un material de sustrato y un mortero para que se incorpore, evaluando de esta forma el efecto que tiene cada uno de los elementos. Se ha simulado y evaluado el efecto en cada escenario de estudio sobre la demanda energ茅tica del demostrador, desde la soluci贸n constructiva del fabricante hasta la soluci贸n con el mortero aditivado con MCF aplicado como recubrimiento interior de las paredes. En paralelo se ha realizado la simulaci贸n mediante TRNSYS de una instalaci贸n fotovoltaica de 50, 100, 200 y 300 W conectadas a una bomba de calor sobre la que se ha considerado que tiene un rendimiento en calefacci贸n de 3 y un rendimiento de refrigeraci贸n de 2. Los resultados muestran que hay una gran cantidad de energ铆a de calefacci贸n que se pierde en los momentos en los que la demanda de calefacci贸n es reducida y la disponibilidad de energ铆a solar es alta. Tambi茅n se ha podido comprobar que el dimensionado para refrigeraci贸n es m谩s cr铆tico que para calefacci贸n. Finalmente cabe indicar que el presente trabajo se ha realizado dentro del marco del proyecto SUDOKET financiado por la convocatoria Interreg SUDOE.ABSTRACT: The present work evaluates the effect that the incorporation of Phase Change Materials (PCM) in the building envelope has in the operation of a solar photovoltaic (PV) generation system coupled with a heat pump for covering the thermal demand of a building. Based on data from a real scale facility, the EnergyPlus models of different case scenarios have been performed, taking into account that the application of microencapsulated PCM as an interior wall coating requires a substrate material and a mortar matrix to be embedded into. The effect on each case scenario on the buildings energy demand, from the manufacturer constructive walls solution until the PCM enhanced mortar applied as the interior wall coating, has been simulated and evaluated. In parallel, the TRNSYS simulation of a solar photovoltaic (PV) system has been performed, considering 50, 100, 200 and 300 W connected to a heat pump with a heating performance of 3 and a cooling performance of 2. The obtained results show that there is a large amount of heating energy that is wasted when the demand for heating is low and the availability of solar energy is high. It has also been demonstrated that sizing for cooling is more critical than for heating. Finally, it should be indicated that this work has been carried out within the SUDOKET project financed by the Interreg SUDOE programme.info:eu-repo/semantics/publishedVersio

    Integraci贸n de solar t茅rmica en redes de distrito : predicci贸n de la producci贸n

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    CIES2020 - XVII Congresso Ib茅rico e XIII Congresso Ibero-americano de Energia SolarRESUMEN: El presente trabajo describe un algoritmo de c谩lculo de predicci贸n de producci贸n de plantas solares t茅rmicas para su uso integrado en un sistema de control de redes de distrito (GIRTER). Inicialmente se describe brevemente la estrategia global con el fin de poder integrar el aporte de la producci贸n solar, como un elemento que resta carga al sistema. A partir de la estimaci贸n de un horizonte de predicci贸n dependiente de las inercias de la red de distrito, se obtiene una predicci贸n horaria de temperatura y radiaci贸n horizontal de una base de datos externa que son empleadas para determinar la demanda asociada a los edificios de la red de distrito as铆 como a la producci贸n de la instalaci贸n solar. A continuaci贸n se describe el algoritmo desarrollado basado en la ecuaci贸n de Bliss indicando el procedimiento de c谩lculo de los diferentes t茅rminos. Finalmente se muestra su validaci贸n comparando los resultados que da GIRTER con los de una simulaci贸n realizada en TRNSYS庐. El proyecto GIRTER ha sido realizado dentro de la convocatoria RETOS 2016.ABSTRACT: The present work describes an algorithm for calculating the prediction of the production of solar thermal plants for its integrated use in a district network control system (GIRTER). Initially, the global strategy is briefly described in order to be able to integrate the contribution of solar production, as an element that reduces the burden on the system. From the estimation of a prediction horizon dependent on the inertias of the district network, an hourly prediction of temperature and horizontal radiation is obtained from an external database that are used to determine the demand associated with the buildings of the network of district, as well as the production of the solar installation. The following describes the algorithm developed based on the Bliss equation, indicating the procedure for calculating the different terms. Finally, its validation is shown by comparing the results that GIRTER gives with those of a simulation carried out in TRNSYS庐. The GIRTER project has been carried out within the RETOS 2016 call.info:eu-repo/semantics/publishedVersio

    Evolution of the use of corticosteroids for the treatment of hospitalised COVID-19 patients in Spain between March and November 2020: SEMI-COVID national registry

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    Objectives: Since the results of the RECOVERY trial, WHO recommendations about the use of corticosteroids (CTs) in COVID-19 have changed. The aim of the study is to analyse the evolutive use of CTs in Spain during the pandemic to assess the potential influence of new recommendations. Material and methods: A retrospective, descriptive, and observational study was conducted on adults hospitalised due to COVID-19 in Spain who were included in the SEMI-COVID- 19 Registry from March to November 2020. Results: CTs were used in 6053 (36.21%) of the included patients. The patients were older (mean (SD)) (69.6 (14.6) vs. 66.0 (16.8) years; p < 0.001), with hypertension (57.0% vs. 47.7%; p < 0.001), obesity (26.4% vs. 19.3%; p < 0.0001), and multimorbidity prevalence (20.6% vs. 16.1%; p < 0.001). These patients had higher values (mean (95% CI)) of C-reactive protein (CRP) (86 (32.7-160) vs. 49.3 (16-109) mg/dL; p < 0.001), ferritin (791 (393-1534) vs. 470 (236- 996) 碌g/dL; p < 0.001), D dimer (750 (430-1400) vs. 617 (345-1180) 碌g/dL; p < 0.001), and lower Sp02/Fi02 (266 (91.1) vs. 301 (101); p < 0.001). Since June 2020, there was an increment in the use of CTs (March vs. September; p < 0.001). Overall, 20% did not receive steroids, and 40% received less than 200 mg accumulated prednisone equivalent dose (APED). Severe patients are treated with higher doses. The mortality benefit was observed in patients with oxygen saturation </=90%. Conclusions: Patients with greater comorbidity, severity, and inflammatory markers were those treated with CTs. In severe patients, there is a trend towards the use of higher doses. The mortality benefit was observed in patients with oxygen saturation </=90%

    Modelo reducido de predicci贸n de demanda de edificios residenciales en base a par谩metros meteorol贸gicos

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    CIES2020 - XVII Congresso Ib茅rico e XIII Congresso Ibero-americano de Energia SolarRESUMEN: En el proyecto Girter se desarroll贸 una herramienta inteligente de control de redes de distrito de calor y fr铆o que gestione de forma conjunta generaci贸n y demanda. En este trabajo se busca anticipar la evoluci贸n de la demanda, lo que permitir谩 optimizar la producci贸n, maximizando el aporte de energ铆a renovable. Para ello se obtendr谩 una ecuaci贸n de orden reducido que caracterice el comportamiento energ茅tico del edificio en base a sus variables constructivas. Esta formulaci贸n matem谩tica permite predecir, de forma estimada, la climatizaci贸n de un edificio dentro de un horizonte de predicci贸n clim谩tico disponible. Analizando los valores de energ铆a obtenidos de una bater铆a de simulaciones din谩micas, se escoge un modelo de calidad probada y se obtienen los par谩metros correspondientes a 6 tipos de edificios. Estos permiten definir la predicci贸n de demanda de un distrito completo.ABSTRACT: In Girter project we developed an intelligent tool to control district heating and cooling networks, managing jointly generation and demand. The aim of this work is to anticipate the evolution of demand, which will optimize production and maximize the contribution of renewable energy. To this end, we will obtain a reduced order equation characterizing the energy behavior of the building based on its construction variables. This mathematical formulation allows to predict an estimation of the HVAC energy of a building within an available climate prediction time horizon. After analyzing the energy values obtained from a battery of dynamic simulations, we chose model of proven quality, and the associated parameters corresponding to 6 types of building are obtained. These allow a whole district demand prediction to be defined.info:eu-repo/semantics/publishedVersio
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