BackBrowsing by Author "Echániz, Telmo"
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Angle-resolved direct emissivity measurements on unencapsulated solar cells for passive thermal control
González de Arrieta Martinez, Iñigo
; Echániz Ariceta, Telmo ; ; López, Gabriel Alejandro (IEEE, 2024-03-18)
The emissivity of two unencapsulated photovoltaic cells has been measured by a direct radiometric method, between 30 and 50 °C, and indirectly at room temperature. The advantages of the angle-resolved direct method for the ... -
Effects of environmental and operational variability on the spectrally selective properties of W/WAlN/WAlON/Al2O3 –based solar absorber coating
; ; Echániz Ariceta, Telmo; González de Arrieta Martinez, Iñigo ; López, Gabriel Alejandro ; (Elsevier, 2018-06-01)
The stability of solar selective absorber coatings in hostile environments (e.g., humid condition, corrosive medium, longer exposure at elevated temperature) needs to be critically assessed to ensure durability of such ... -
Eguzki-energia termikoa metatzeko materialetako emisibitate-esperimentuak
Echániz Ariceta, Telmo; González de Arrieta Martinez, Iñigo ; ; Urcelay Olabarria, Irene ; López, Gabriel Alejandro ; Igartua Aldamiz, Josu Mirena (Servicio Editorial de la Universidad del País Vasco/Euskal Herriko Unibertsitatearen Argitalpen Zerbitzua, 2018)
Emisibitate infragorria materialen propietate termofisiko bat da. Erradiazio elektromagnetikoa igortzeko materialek daukaten ahalmena adierazten du parametro horrek. Eguzki-energiaren industrian erabiltzen diren materialen ... -
Emissivity measurements conducted on intermetallic γ-TiAl-based alloys for aeronautical applications
; ; Echániz Ariceta, Telmo; ; ; ; López, Gabriel Alejandro (Elsevier, 2023-11)
The directional spectral emissivity of a Ti–48Al–2Nb–2Cr alloy (in at.%), 4822 alloy, and a Ti-43.5Al–4Nb–1Mo-0.1B alloy (in at.%),TNM alloy, used in the aeronautical industry, are measured between 150 and 850 °C. The ... -
Emissivity measurements on noble metals: validation of a free-electron description including the anomalous skin effect
González de Arrieta Martinez, Iñigo; Echániz Ariceta, Telmo ; ; ; ; López, Gabriel Alejandro (Springer Nature, 2024)
The optical properties of noble metals (Cu, Ag, and Au) have been studied in the mid-infrared using emissivity measurements at 473 K. Their optical responses can be described using classical free-electron expressions in ... -
Experimental and numerical study of the emissivity of rolled aluminum
; ; González de Arrieta Martinez, Iñigo; Echániz Ariceta, Telmo ; López, Gabriel Alejandro (Elsevier, 2022-12)
Directional spectral emissivity measurements on a rolled aluminum sheet are reported between 423 and 823 K in vacuum. The results are compared to available literature data and to theoretical predictions, revealing the ... -
Experimental verification of the anomalous skin effect in copper using emissivity measurements
Echániz Ariceta, Telmo; ; ; (AIP, 2013-06-20)
Spectral directional emissivity has been measured in copper between 3 and 24 μm above room temperature. The experimental spectrum shows a weak broad peak between 7 and 14 μm, which is much more acute for higher emission ... -
First spectral emissivity study of a solar selective coating in the150–600 ºC temperature range
; Echániz Ariceta, Telmo; ; ; ; ; ; ; ; ; (Elsevier, 2013-07-20)
A complete experimental study of temperature dependence of the total spectral emissivity has been performed, for the first time, for absorber–reflector selective coatings used in concentrated solar power (CSP) systems for ... -
Importance of the spectral emissivity measurements at working temperature to determine the efficiency of a solar selective coating
Echániz Ariceta, Telmo; ; ; ; ; (Elsevier, 2015-09-01)
The total emissivity of the absorbing surfaces is a critical parameter in the calculation of the radiative thermal losses in solar thermal collectors. This is because the radiative heat losses have a significant economic ... -
In situ high-temperature emissivity measurements of heat-treated, silicon coated stainless steel for solar thermal applications
; ; ; Echániz Ariceta, Telmo; ; ; López, Gabriel Alejandro (Elsevier, 2024-11-01)
Understanding thermal emissivity at high temperatures is crucial for developing efficient materials for solar thermal applications. We present a new approach for creating an efficient material for solar absorber by developing ... -
Infrared emissivity of copper-alloyed spinel black coatings for concentrated solar power systems
González de Arrieta Martinez, Iñigo; Echániz Ariceta, Telmo ; ; ; ; Igartua Aldamiz, Josu Mirena ; ; López, Gabriel Alejandro (Elsevier, 2019-05-24)
The directional spectral emissivities of four new copper-alloyed spinel coatings for concentrated solar power applications were measured up to 800 °C and compared Pyromark 2500®, deposited in the same conditions on Inconel ... -
Infrared emissivity of reduced-activation Eurofer 97 for fusion reactor applications
Echániz Ariceta, Telmo; González de Arrieta Martinez, Iñigo ; ; ; ; ; López, Gabriel Alejandro (Elsevier, 2021-02-28)
The spectral directional emissivity of Eurofer 97 is reported between 423 and 873 K for two surface states. Total hemispherical data has been calculated by numerical integration of the measured data and compared to the ... -
Infrared spectral emissivity studies on metals and materials for solar thermal power plants
Echániz Ariceta, Telmo (2016-09-12)
Dentro del marco industrial mundial y del País Vasco en particular el sector metalúrgico ha tenido y tiene un peso muy importante. En muchos de los materiales utilizados es vital conocer las pérdidas de calor por radiación, ... -
IR radiometer sensitivity and accuracy improvement by eliminating spurious radiation for emissivity measurements on highly specular samples in the 2–25 lm spectral range
Echániz Ariceta, Telmo; ; (Elsevier, 2017-06-10)
This paper indicates that the sensitivity and accuracy of an infrared radiometer for emissivity measurements depends not only on its design and the measurement method, but also on the spurious radiation. This spurious ... -
Isothermal oxidation kinetics of nitrided Ti-6Al-4V studied by infrared emissivity
González de Arrieta Martinez, Iñigo; ; ; Echániz Ariceta, Telmo ; (Elsevier, 2020-08-15)
The oxidation kinetics of Ti-6Al-4V samples nitrided in forming gas (N2+5%H2) between 520 and 805 °C is investigated using infrared emissivity measurements. Several kinetic exponents have been observed depending on temperature ... -
Mid-infrared optical properties of pyrolytic boron nitride in the 390–1050 °C temperature range using spectral emissivity measurements
González de Arrieta Martinez, Iñigo; Echániz Ariceta, Telmo ; ; ; ; López, Gabriel Alejandro ; (Elsevier, 2017-03-17)
This paper shows a systematic experimental and theoretical study on the temperature dependence of the infrared optical properties of pyrolytic boron nitride (pBN), from 390 to 1050 °C for wavelengths between 4 and 16 μm. ... -
Optical properties of metals: Infrared emissivity in the anomalous skin effect spectral region
Echániz Ariceta, Telmo; ; (American Institute of Physics, 2014-09-07)
When the penetration depth of an electromagnetic wave in a metal is similar to the mean free path of the conduction electrons, the Drude classical theory is no longer satisfied and the skin effect becomes anomalous. Physical ... -
Precise spectral directional infrared emissivity of a Cantor high-entropy alloy
; ; ; ; ; ; Echániz Ariceta, Telmo (AIP, 2024-07-11)
The multicomponent equiatomic CrMnFeCoNi alloy was proposed by B. Cantor almost 20 years ago and was the first in the family of so-called multiprincipal or high-entropy alloys (HEAs). Various mechanical properties of the ... -
Purutasun handiko aluminio laminatuaren eremu infragorriko emisibitatearen neurketa zehatzak
(2021-12-03)[ES] A través de este trabajo se ha buscado el cumplimiento de los siguientes objetivos: Entrenamiento en la realización de mediciones experimentales, tratamiento de datos e interpretación de datos. Realización de ... -
Round Robin Test for the comparison of spectral emittance measurement apparatuses
; ; ; ; ; ; ; ; ; ; ; ; ; López, Gabriel Alejandro; Echániz Ariceta, Telmo ; ; ; ; ; (Elsevier, 2018-12-13)
CSP (Concentrated Solar Power) plants technologies use the concentration of solar energy on a receiver to produce heat and then electricity by a thermodynamical process. A solar absorber material is used to convert the ...