103 documents found, page 1 of 11

Thermophysical properties of n-alkane system for low temperature thermal energy...

Over the past few decades, the escalating need for energy has posed a significant and pressing challenge. For centuries, fossil fuels stood as the dominant energy source; however, due to their dwindling availability and environmental complications, renewable energies have emerged as the promising solution for the future [1]. The intermittent nature of renewable energy sources often results in a disconnect betwe...

Capillary viscometry for routine measurements of newtonian liquids

Viscosity is a thermophysical property of paramount importance, being essential for many scientific and industrial applications. The most common instruments for its measurement are glass capillary viscometers. Therefore, the use of capillary viscometers is widespread both in industry and in research. The range of viscosities of interest range from lower than that of water to several orders of magnitude higher v...

Low temperature thermal energy storage: insights into odd-even n-alkane system

Revisiting odd-even effects in n-alkane systems

n-Alkanes have been widely studied for different applications. Recently, they became still more popular due to their exceptional characteristics as phase change materials (PCMs) for thermal energy storage (TES) applications [1]. In our research group, during the last three years, we have been studying the phase equilibrium behaviour of some binary systems with potential application as PCMs, including n-alkanes ...

Seeking new low temperature energy storage systems: n-alkanes as phase change m...

Over the last decades, the increasing need for energy has been a tremendous challenge. Until now, fossil fuels have been the dominant energy source, however, due to their environmental consequences, renewable energies are the promising solution for the future.1 Nevertheless, the intermittent nature of most renewable energy sources often leads to a discrepancy between the energy produced and its consumption, whi...

Solid–liquid phase equilibrium of the n-Nonane + n-Undecane system for low-temp...

The current article presents an exploration of the solid–liquid phase diagram for a binary system comprising n-alkanes with an odd number of carbon atoms, specifically n-nonane (n-C9) and n-undecane (n-C11). This binary system exhibits promising characteristics for application as a phase change material (PCM) in low-temperature thermal energy storage (TES), due to the fusion temperatures of the individual compo...

Microcredentials: an opportunity towards the digital transformation

This communication aims to present one of the online courses included in the Microcredentials portfolio of the Universidade Aberta, in Portugal. We start by presenting a framework of the European guidelines on Microcredentials, defining its main characteristics, namely highlighting its advantages in the context of reskilling or upskilling with a view to its applicability in the labor sector. Following the guide...

Viscosity and density measurements of poly(ethyleneglycol) 200 and poly(ethylen...

New measurements for the viscosity and density of poly(ethyleneglycol) 200 [PEG 200] and of poly(ethyleneglycol) 600 [PEG 600], at pressures up to 50 MPa, are presented. The temperature range of the measurements performed for PEG 200 was from 293 to 348 K and for PEG 600 was from 303 to 348 K. A vibrating wire viscometer operated in the steady-state mode was used to carry out the measurements with an estimated ...

Microcredentials: an opportunity towards the digital transformation

This communication aims to present one of the online courses included in the Microcredentials portfolio of the Universidade Aberta, in Portugal. We start by presenting a framework of the European guidelines on Microcredentials, defining its main characteristics, namely highlighting its advantages in the context of reskilling or upskilling with a view to its applicability in the labor sector. Following the guide...

Exploring the value and perception of microcredentials: a case study of the Uni...

The Universidade Aberta (UAb) – the Portuguese Open University - has extensive experience inproviding continuous professional development courses for adult learners, ranging frompostgraduate certificates to short learning programmes and MOOCs. In 2021, the UAb initiateda new portfolio of short learning opportunities leading to micro-credentials, driven by anationally-funded project called "Impulso Adultos" whic...