Dynamic Parameters to Characterize the Thermal Behaviour of a Layer Subject to Periodic Phase Changes

Abstract The paper addresses the issue of the dynamic characterization of a layer subject to phase change (PCM) with non-sinusoidal periodic boundary conditions, which are typical of the external walls of air-conditioned building. The dynamic parameters used to characterize a monophase layer are not sufficient to describe how the temperature and heat flux trends in transfer through a layer subject to phase change are modified. Furthermore, a PCM due to the effect of latent heat associated with the phase change significantly modifies the heat storage capacity of the wall. The proposed parameters are determined by means of an explicit finite difference numerical model, considering PCM with different melting temperatures and thermophysical properties. The boundary conditions are such that one or more bi-phase interfaces originate in the layer. These parameters can be used for the thermal design of innovative walls in air-conditioned buildings with the aim of reducing power peaks entering the indoor environment, or to reduce thermal requirements, or to improve the thermal comfort within the building

Dynamic Thermal Characteristics of Opaque Building Components. A Proposal for the Extension of EN ISO 13786

Abstract In order to dynamically characterise the opaque components of a building envelope subject to sinusoidal loadings in steady periodic regime conditions, the use of nondimensional periodic thermal transmittance is proposed. Such a parameter allows for the evaluation of the decrement factor and time lag that the heat flux undergoes while crossing the wall and the efficiency of the heat storage. For non-sinusoidal loadings, dynamic characterisation is obtained by the decrement factor, defined as the ratio between energy in a semi period entering the indoor environment and entering the wall and as the ratio between maximum heat fluxes entering the environment and the wall, and as the ratio between the minimum heat fluxes. These parameters allow to determine the heat storage capacity of the component, the maximum heat flux in summer and winter conditions and their time lags. The defined dynamic properties were calculated considering two commonly used walls and surrounding conditions that are representative of the effective operative conditions

Towards standardization of echocardiography for the evaluation of left ventricular function in adult rodents : a position paper of the ESC Working Group on Myocardial Function

This work was supported by AIRC IG grant 2016 19032 to S.Z.; FEDER through Compete 2020 –Programa Operacional Competitividade E Internacionalização(POCI), the project DOCNET (norte-01-0145-feder-000003), supported by Norte Portugal regional operational programme (norte 2020), under the Portugal 2020 partnership agreement, through the European Regional Development Fund (ERDF), the project NETDIAMOND (POCI-01-0145-FEDER-016385), supported by European Structural And Investment Funds, Lisbon’s regional operational program 2020 to I.P.F.; grants from FSR-FNRS, FRC (Cliniques Universitaires Saint-Luc) and from Action de Recherche Concertée (UCLouvain) to C.B., E.P.D. and L.B; the ERA-Net-CVD project MacroERA,01KL1706, FP7-Homage N° 305507, and IMI2-CARDIATEAM (N° 821508)to S.H.,the DZHK (German Centre for Cardiovascular Research) and the German Ministry of Research and Education (BMBF)to F.W., T.E. and L.C., the Netherlands Cardiovascular Research Initiative, an initiative with support of the Dutch Heart Foundation, CVON2016-Early HFPEF, 2015-10, CVON She-PREDICTS, grant 2017-21, CVON Arena-PRIME, 2017-18, Flemish Research FoundationFWO G091018N and FWO G0B5930N to S.H.; Federico II University/Ricerca di Ateneo grant to C.G..T.; the European Research Area Networks on Cardiovascular Diseases (ERA-CVD) [LYMIT-DIS 2016, MacroERA], Fonds Wetenschappelijk Onderzoek [1160718N] to I.C; the Deutsche Forschungsgemeinschaft (DFG TH903/20-1, KFO311), the Transregio-SFB INST 95/15641 and the EU Horizon 2020 project Cardioregenix (GA 825670)to T.TPeer reviewedPostprin

Data demonstrating the influence of the latent storage efficiency on the dynamic thermal characteristics of a PCM layer

Dynamic thermal characteristics, for each month of the year, of PCM layers with different melting temperatures and thermophysical properties, in a steady periodic regime, were determined (Mazzeo et al., 2017 [1]). The layer is subjected to climatic conditions characterizing two locations, one with a continental climate and the second one with a Mediterranean climate. This data article provides detailed numerical data, as a function of the latent storage efficiency, including monthly average daily values: of the latent energy fraction, of the decrement factors of the temperature, of the heat flux and of the energy, and of the time lags of the maximum and minimum peaks of the temperature and of the heat flux

Impianto rinnovabile ibrido fotovoltaico-eolico con accumulo per la produzione di energia elettrica per uso residenziale: studio di fattibilità energetica ed economica

In questo lavoro è presentata un’analisi energetica ed economica di un sistema ibrido connesso alla rete, costituito da un generatore fotovoltaico, un microgeneratore eolico e un sistema di accumulo elettrico, per la fornitura di energia elettrica ad uso residenziale. Lo studio è stato effettuato in ambiente TRNSYS, attraverso la definizione di un modello e un algoritmo dinamico per la valutazione della potenza elettrica in ingresso e in uscita da ciascun componente del sistema ibrido. In particolare, la potenza prodotta e utilizzata dall’utenza, la potenza accumulata e rilasciata dalla batteria, la potenza in eccesso e la potenza prelevata dalla rete sono state calcolate in relazione all’andamento temporale del carico elettrico dell’utenza residenziale. Gli andamenti temporali delle potenze sono state utilizzate per valutare le prestazioni energetiche annuali del sistema al variare della potenza del generatore fotovoltaico e del generatore eolico, per diversi valori della capacità di accumulo elettrico. L’analisi parametrica ha permesso di identificare le configurazioni del sistema che garantiscono valori elevati di energia prodotta e autoconsumata e valori ridotti di energia in eccesso inviata alla rete. I risultati dell’analisi energetica sono stati utilizzati per sviluppare un’analisi economica impiegando il metodo del Net Present Value (NPV), allo scopo di stimare la fattibilità dell’investimento e di definire la migliore configurazione del sistema

Determination of antibodies to Borrelia burgdorferi in the serum of patients living in Calabria, Southern Italy

The aim of our work was to determine the sere-prevalence of antibodies to B. burgdorferi in 300 patients living in Calabria, a region of southern Italy, The research of antibodies to B. burgdorferi was conducted by ELISA as a screening method and Western Blot as a confirmatory test, Out of the 300 patients we found a rate of positivity of 7.3% with ELISA and 4.5% with Western Blot, This data allows us to classify Calabria, among the regions where Lyme borreliosis is non-endemic and where sero-epidemiological research has been carried out on patients, as having a degree of positivity second to that of Campania (9.1%) and higher than Lombardy (3.2%) and Umbria (2.8%), Considering all the demographic and clinical data, only that of the higher Ige positivity of males over females is statistically significant