14 documents found, page 1 of 2
Thermophysical characterization of commercial paraffin-based PCMs for low tempe...
Matias, T.; Soares, N.; Campos-Gonçalves, I.; Costa, J.J.; Simões, P. N.; Durães, L.Reliable data on the thermophysical properties of commercial Phase Change Materials (PCMs) is fundamental for the design and modelling of low temperature Thermal Energy Storage (TES) applications. However, data provided by manufacturers is often insufficient and uncertain. In this work, an experimental study was conducted to determine the relevant thermophysical properties of some commercial paraffin-based PCMs...
The importance of the thermophysical characterization of microencapsulated PCMs...
Soares, N.; Luzio, A.; Matias, T.; Simões, P. N.; Durães, L.; Costa, J.J.This work presents the development of two-dimensional numerical models based on the “additional heat source” and the “effective heat capacity” methods to simulate the thermal behaviour of a microencapsulated phase change material (PCM) - Micronal® DS 5001 X. A purely diffusive, transient model was used, where conduction is the only heat transfer mechanism during phase change. Different ways are evaluated to spe...
Systems with PCM-filled rectangular cavities for the storage of solar thermal e...
Soares, N.; Lopes, A. G.; Gonçalves, M.; Gaspar, A. R.; Martins, C.; Matias, T.; Santos, P.; Simões, P. N.; Durães, L.; Costa, J. J.This paper provides an overview of the ongoing research project "PCMs4Buildings - Systems with PCM-filled rectangular cavities for the storage of solar thermal energy for buildings". The main goal of this project is to develop a holistic approach for the experimental and numerical evaluation of the thermal behaviour of new thermal energy storage (TES) systems with rectangular cavities filled with phase change m...
Apresentação do projeto PCMs4Buildings
Soares, N.; Lopes, A. G.; Gaspar, A. R.; Martins, C.; Durães, L.; Gonçalves, M.; Santos, P.; Simões, P. N.; Matias, T.; Costa, J.J.
Apresentação do projeto PCMs4Buildings - Sistemas com cavidades retangulares co...
Soares, N.; Lopes, A.G.; Gaspar, A. R.; Durães, L.; Gonçalves, M.; Santos, P.; Simões, P. N.; Matias, T.; Costa, J.J.
Kick-off presentation of the project "PCMs4Buildings" - Systems with PCM-filled...
Soares, N.; Gaspar, A. R.; Santos, P.; Lopes, A. G.; Durães, L.; Simões, P. N.; Costa, J. J.This paper aims to provide a kick-off presentation of the project “PCMs4Buildings” - Systems with PCM-filled rectangular cavities for the storage of solar thermal energy for buildings. The main goal of this project is to develop a CFD methodology for the parametric analysis of the thermal behaviour of new TES systems with rectangular cavities filled with phase change materials (PCMs). These systems are designed...
Effect of cholesterol-poly(N,N-dimethylaminoethyl methacrylate) on the properti...
Alves, P.; Hugo, A. A.; Tymczyszyn, E. E.; Ferreira, A. F.; Fausto, R.; Pérez, P. F.; Coelho, J. F. J.; Simões, P. N.; Gómez-Zavaglia, AThe development of new polymer-liposome complexes (PLCs) as delivery systems is the key issue of this work. Three main areas are dealt with: polymer synthesis/characterization, liposome formulation/characterization and evaluation of the PLCs uptake by eukaryotic cells. Poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) with low molecular weight and narrow polydispersity was synthesized by Atom Transfer Radical...
Transport and thermal properties of quaternary phosphonium ionic liquids and Io...
Ferreira, A. G. M.; Simões, P. N.; Ferreira, A. F.; Fonseca, M. A.; Oliveira, M. S. A.; Trino, A. S. M.The transport and thermal properties of phosphonium ionic liquids (ILs) and thermally stable suspensions of phosphonium ILs and multiwalled carbon nanotubes (MWCNT) were determined. The thermal conductivity was measured over the temperature range T = (280 to 360) K, and at atmospheric pressure, using the transient hot-wire method with an accuracy estimated as 5% from (0.2 to 2) W · m−1 · K−1 and less than ±0.01...
Study of Nα-benzoyl-L-argininate ethyl ester chloride, a model compound for pol...
Fonseca, A. C.; Jarmelo, S.; Silva, M. Ramos; Beja, A. M. Matos; Fausto, R.; Gil, M. H.; Simões, P. N.Poly(ester amide)s (PEAs) are lacking in structural and spectroscopic information. This paper reports a structural and spectroscopic characterization of Nα-benzoyl-L-argininate ethyl ester chloride (BAEEH+·Cl−), an important amino acid derivative and an adequate PEAs’ model compound. Crystals of BAEEH+·Cl− obtained by slow evaporation in an ethanol/water mixture were studied by different complementary technique...
Low-Temperature FTIR Spectroscopic and Theoretical Study on an Energetic Nitroi...
Simões, P. N.; Reva, I.; Pedroso, L. M.; Fausto, R.; Portugal, A. A.This paper presents an overview of recent progress in spectroscopic studies of the energetic nitroimine 4,6-bis(nitroimino)-1,3,5-triazinan-2-one (DNAM), based on experimental and theoretical data. The following topics are considered: variable temperature FTIR spectroscopy (4000−400 cm-1) applied to the study of natural and isotopically substituted (deuterated) samples aiming to obtain a successful vibrational ...