Modelo termo hidráulico solar para colectores solares de convección natural

We present the development of a thermal-hydraulic-solar model (MTHS) for design and numerical simulation of solar thermal collectors. The MTHS is a powerful tool that, not only simulates the above, but also allows to extrapolate collector behavior for different weather patterns for any day of the year, at any latitude of the country, thus allowing maximize the efficiency of the collector in each particular case. The model takes into account in its equations the characteristic parameters of a collector, such as: optical efficiency and the overall heat loss coefficient, what defined efficiency collector. The model also includes the geometrical parameters of a collector, such as length and diameter of the absorber (values that determine the pressure drop of hydrodynamic circuit), it also uses the positioning data such as azimuth angle of the absorber, and the height of tank (values of which depends heavily the buoyant force needed to establish the natural convection in the collector).Se presenta el desarrollo de un modelo termo-hidráulico solar (MTHS) para el diseño y simulación numérica de colectores solares térmicos. El MTHS es una poderosa herramienta que permite simular el comportamiento de un colector en diferentes patrones para cualquier día del año, en cualquier latitud del país, permitiendo maximizar el rendimiento en cada caso particular. El modelo tiene en cuenta en sus ecuaciones los parámetros característicos de un colector: la eficiencia óptica y el coeficiente de pérdida global de calor, ambos definen la eficiencia del mismo. Además contempla sus parámetros geométricos constructivos, como ser longitud y diámetro del absorbedor (valores que determinan la pérdida de carga hidrodinámica del sistema), y área de colección; además de las variables de ubicación como el ángulo de elevación acimutal del absorbedor, y la altura o desnivel del tanque (valor del cual depende fuertemente la fuerza boyante que origina la convección natural en el colector).Tema 3: Energía solar, aplicaciones térmicas y químicas.Facultad de Arquitectura y Urbanism

Modelo termo hidráulico solar para colectores solares de convección natural

We present the development of a thermal-hydraulic-solar model (MTHS) for design and numerical simulation of solar thermal collectors. The MTHS is a powerful tool that, not only simulates the above, but also allows to extrapolate collector behavior for different weather patterns for any day of the year, at any latitude of the country, thus allowing maximize the efficiency of the collector in each particular case. The model takes into account in its equations the characteristic parameters of a collector, such as: optical efficiency and the overall heat loss coefficient, what defined efficiency collector. The model also includes the geometrical parameters of a collector, such as length and diameter of the absorber (values that determine the pressure drop of hydrodynamic circuit), it also uses the positioning data such as azimuth angle of the absorber, and the height of tank (values of which depends heavily the buoyant force needed to establish the natural convection in the collector).Se presenta el desarrollo de un modelo termo-hidráulico solar (MTHS) para el diseño y simulación numérica de colectores solares térmicos. El MTHS es una poderosa herramienta que permite simular el comportamiento de un colector en diferentes patrones para cualquier día del año, en cualquier latitud del país, permitiendo maximizar el rendimiento en cada caso particular. El modelo tiene en cuenta en sus ecuaciones los parámetros característicos de un colector: la eficiencia óptica y el coeficiente de pérdida global de calor, ambos definen la eficiencia del mismo. Además contempla sus parámetros geométricos constructivos, como ser longitud y diámetro del absorbedor (valores que determinan la pérdida de carga hidrodinámica del sistema), y área de colección; además de las variables de ubicación como el ángulo de elevación acimutal del absorbedor, y la altura o desnivel del tanque (valor del cual depende fuertemente la fuerza boyante que origina la convección natural en el colector).Tema 3: Energía solar, aplicaciones térmicas y químicas.Facultad de Arquitectura y Urbanism

Nuevo colector solar térmico de bajo costo de flujo forzado autónomo por panel fotovoltaico

The development of simple and inexpensive design of solar thermal collectors is presented. They are based on a long LDPE hose, that works by forced recirculation assisted by a pump which is powered by a little photovoltaic panel. The feasibility of this simple and autonomous thermoidraulic configuration was experimentally demonstrated. A prototype, of 50 liters with 50 meters of hose (3/4") and a 2 W pump which is operated by 3W 12 V panel, has been elaborated. The prototype has worked with an average efficiency of 37%, reaching the water, on a winter day with solar average irradiances of 700 W / m2, a maximum temperature of 48 °C.Se presenta el desarrollo de colectores solares térmicos de bajo costo y simple diseño, basados en una larga manguera de PEBD que operan por recirculación forzada asistida por mini bomba regulada y alimentada por panel fotovoltaico. Se demostró experimentalmente la factibilidad de esta configuración termohidráulica simple y autónoma. Un prototipo (50 litros y 50 metros manguera de ¾”, bomba de 2W y panel fotovoltaico de 3W en 12 voltios) obtuvo eficiencias promedio del 37%, calentando agua a 48°C en invierno en Salta con irradiancias de 700 W/m2.Tema 3: Energía solar, aplicaciones térmicas y químicas.Facultad de Arquitectura y Urbanism

Nuevo colector solar térmico de bajo costo de flujo forzado autónomo por panel fotovoltaico

The development of simple and inexpensive design of solar thermal collectors is presented. They are based on a long LDPE hose, that works by forced recirculation assisted by a pump which is powered by a little photovoltaic panel. The feasibility of this simple and autonomous thermoidraulic configuration was experimentally demonstrated. A prototype, of 50 liters with 50 meters of hose (3/4") and a 2 W pump which is operated by 3W 12 V panel, has been elaborated. The prototype has worked with an average efficiency of 37%, reaching the water, on a winter day with solar average irradiances of 700 W / m2, a maximum temperature of 48 °C.Se presenta el desarrollo de colectores solares térmicos de bajo costo y simple diseño, basados en una larga manguera de PEBD que operan por recirculación forzada asistida por mini bomba regulada y alimentada por panel fotovoltaico. Se demostró experimentalmente la factibilidad de esta configuración termohidráulica simple y autónoma. Un prototipo (50 litros y 50 metros manguera de ¾”, bomba de 2W y panel fotovoltaico de 3W en 12 voltios) obtuvo eficiencias promedio del 37%, calentando agua a 48°C en invierno en Salta con irradiancias de 700 W/m2.Tema 3: Energía solar, aplicaciones térmicas y químicas.Facultad de Arquitectura y Urbanism

Modelo termo hidráulico solar para colectores solares de convección natural

We present the development of a thermal-hydraulic-solar model (MTHS) for design and numerical simulation of solar thermal collectors. The MTHS is a powerful tool that, not only simulates the above, but also allows to extrapolate collector behavior for different weather patterns for any day of the year, at any latitude of the country, thus allowing maximize the efficiency of the collector in each particular case. The model takes into account in its equations the characteristic parameters of a collector, such as: optical efficiency and the overall heat loss coefficient, what defined efficiency collector. The model also includes the geometrical parameters of a collector, such as length and diameter of the absorber (values that determine the pressure drop of hydrodynamic circuit), it also uses the positioning data such as azimuth angle of the absorber, and the height of tank (values of which depends heavily the buoyant force needed to establish the natural convection in the collector).Se presenta el desarrollo de un modelo termo-hidráulico solar (MTHS) para el diseño y simulación numérica de colectores solares térmicos. El MTHS es una poderosa herramienta que permite simular el comportamiento de un colector en diferentes patrones para cualquier día del año, en cualquier latitud del país, permitiendo maximizar el rendimiento en cada caso particular. El modelo tiene en cuenta en sus ecuaciones los parámetros característicos de un colector: la eficiencia óptica y el coeficiente de pérdida global de calor, ambos definen la eficiencia del mismo. Además contempla sus parámetros geométricos constructivos, como ser longitud y diámetro del absorbedor (valores que determinan la pérdida de carga hidrodinámica del sistema), y área de colección; además de las variables de ubicación como el ángulo de elevación acimutal del absorbedor, y la altura o desnivel del tanque (valor del cual depende fuertemente la fuerza boyante que origina la convección natural en el colector).Tema 3: Energía solar, aplicaciones térmicas y químicas.Facultad de Arquitectura y Urbanism

Nuevo colector solar térmico de bajo costo de flujo forzado autónomo por panel fotovoltaico

The development of simple and inexpensive design of solar thermal collectors is presented. They are based on a long LDPE hose, that works by forced recirculation assisted by a pump which is powered by a little photovoltaic panel. The feasibility of this simple and autonomous thermoidraulic configuration was experimentally demonstrated. A prototype, of 50 liters with 50 meters of hose (3/4") and a 2 W pump which is operated by 3W 12 V panel, has been elaborated. The prototype has worked with an average efficiency of 37%, reaching the water, on a winter day with solar average irradiances of 700 W / m2, a maximum temperature of 48 °C.Se presenta el desarrollo de colectores solares térmicos de bajo costo y simple diseño, basados en una larga manguera de PEBD que operan por recirculación forzada asistida por mini bomba regulada y alimentada por panel fotovoltaico. Se demostró experimentalmente la factibilidad de esta configuración termohidráulica simple y autónoma. Un prototipo (50 litros y 50 metros manguera de ¾”, bomba de 2W y panel fotovoltaico de 3W en 12 voltios) obtuvo eficiencias promedio del 37%, calentando agua a 48°C en invierno en Salta con irradiancias de 700 W/m2.Tema 3: Energía solar, aplicaciones térmicas y químicas.Facultad de Arquitectura y Urbanism

XIMPOL: A new X-ray polarimetry observation-simulation and analysis framework

We present a new simulation framework, based on the python programming language and specifically developed for X-ray polarimetric applications, called XIMPOL. Starting from an arbitrary source model (including morphological, temporal, spectral and polarimetric informations), XIMPOL uses the response functions of the detector under study to produce fast and realistic observationsimulations. A Chandra-to-XIMPOL converter is also available within the framework, designed to convert a real Chandra observation into a XIMPOL simulation. The generated output files can be directly fed into the standard visualization and analysis tools, including XSPEC, which makeXIMPOL a useful tool not only for simulating observations of astronomical sources, but also to develop and test end-to-end analysis chains

Low-Energy Electron-Track Imaging for a Liquid Argon Time-Projection-Chamber Telescope Concept using Probabilistic Deep Learning

The GammaTPC is an MeV-scale single-phase liquid argon time-projection-chamber gamma-ray telescope concept with a novel dual-scale pixel-based charge-readout system. It promises to enable a significant improvement in sensitivity to MeV-scale gamma-rays over previous telescopes. The novel pixel-based charge readout allows for imaging of the tracks of electrons scattered by Compton interactions of incident gamma-rays. The two primary contributors to the accuracy of a Compton telescope in reconstructing an incident gamma-ray's original direction are its energy and position resolution. In this work, we focus on using deep learning to optimize the reconstruction of the initial position and direction of electrons scattered in Compton interactions, including using probabilistic models to estimate predictive uncertainty. We show that the deep learning models are able to predict locations of Compton scatters of MeV-scale gamma-rays from simulated pixel-based data to better than 0.6 mm RMS error, and are sensitive to the initial direction of the scattered electron. We compare and contrast different deep learning uncertainty estimation algorithms for reconstruction applications. Additionally, we show that event-by-event estimates of the uncertainty of the locations of the Compton scatters can be used to select those events that were reconstructed most accurately, leading to improvement in locating the origin of gamma-ray sources on the sky

Polarisation leakage due to errors in track reconstruction in gas pixel detectors

X-ray polarimetry based on gas pixel detectors (GPDs) has reached a high level of maturity thanks to the Imaging X-ray Polarimeter Explorer (IXPE) providing the first-ever spatially resolved polarimetric measurements. However, as this a new technique, a few unexpected effects have emerged in the course of in-flight operations. In particular, it was almost immediately found that, the unpolarized calibration sources on-board were showing radially polarized halos. The origin of these features was recognized in a correlation between the error in reconstructing the absorption point of the X-ray photon and the direction of its electric field vector. Here, we present and discuss this effect in detail, showing that it is possible to provide a simple and robust mathematical formalism to handle it. We further show its role and relevance for the recent IXPE measures as well as for the use of GPD-based techniques in general. We also illustrate how to model it in the context of studying extended sources