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Acumulación de calor con materiales de cambio de fase en aplicaciones de energía solar

REA Auditado

[ES] En el departamento de Ingeniería del Instituto del Frío (IF-CSIC) se han investigado nuevos materiales de cambio de fase para acumular calor y desde hace años se les ha buscado aplicaciones en el campo de la energía solar. En el artículo se revisan algunas de las aplicaciones realizadas, entre las que se destacan: muros tipo Trombe translúcidos, cerramientos de gran inercia, suelos radiantes y techos fríos, captadores-acumuladores, proyectos de edificios de oficinas y polideportivos, escuelas y aulas de la naturaleza en diversas latitudes.

Tema: general: 

• Ciencias

Implementation of low thermal inertia injection molds using conformal passages

REA Auditado

by Earl S. Sun. Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995. Includes bibliographical references (p. [175]-176).

Tema: general: 

• Ingeniería y Ciencias Aplicadas›Ingeniería›Ingeniería Mecánica

Low thermal inertia injection molding

REA Auditado

by Byung Hoon Kim. Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983. MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. Vita. Includes bibliographical references.

Tema: general: 

• Ingeniería y Ciencias Aplicadas›Ingeniería›Ingeniería Mecánica

Los materials de cambio de fase en la climatización de hoteles

REA Auditado

Se revisan los consumos energéticos de los hoteles, en particular de la climatización y del agua caliente y se analizan las eficiencias de los sistemas que se están empleando.
Se analizan los materiales de cambio de fase o PCM y se propone su empleo en las instalaciones hoteleras dadas sus ventajas al permitir aprovechar: los calores de compresión y condensación, la inercia térmica, las tarifas eléctricas horarias, así como mejorar la regulación de capacidad y permitir, en algunas instalaciones, la cogeneración.

Tema: general: 

• Ciencias

Thermal conductivity of aluminium foil

REA Auditado

by Robert M. Kelly. Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of General Science, 1931. Includes bibliographical references (leaf 47). Preface: The purpose of this thesis was to investigate the insulation properties of aluminium foil. The use of aluminium foil as a heat insulator though used in the British Isles and on the continent particularly in Germany where it was first developed commercially, is comparatively unknown in this country. This is due to two principal reasons.

Tema: general: 

• Negocios y Economía›Economía›Urbanización y Uso de Suelo

Modelling of unidirectional thermal diffusers in shallow water

REA Auditado

This study is an experimental and theoretical investigation of the temperature field and velocity field induced by a unidirectional thermal diffuser in shallow water. A multiport thermal diffuser is essentially a pipe laid along the bottom of the water body and discharging heated water in the form of turbulent jets through a series of ports spaced along the pipe. A unidirectional diffuser inputs large momentum in one direction; it can achieve rapid mixing within relatively small areas, and has the advantage of directing the thermal effluent away from the shoreline.

Tema: general: 

• Ingeniería y Ciencias Aplicadas›Ingeniería›Ingeniería Ambiental, Hidráulica y Oceánica

Body-size influence on defensive behavior of Amazonian moths: an ecophysiological approach

REA Auditado

Ectotherm locomotion is restricted by low temperatures, and many species, such as some flying insects, need to achieve thermal thresholds before taking off. Body size influences heat exchange between an animal and the environment. Therefore, larger animals have higher thermal inertia, and necessarily spend more time in pre-flight warming up, a critical period when they remain exposed and more susceptible to predators.

Tema: general: 

• Ciencias›Biología

Characterization of the Martian Surface Layer

REA Auditado

We have estimated the diurnal evolution of Monin- Obukhov length, friction velocity, temperature scale, surface heat flux, eddy-transfer coefficients for momentum and heat, and turbulent viscous dissipation rate on the Martian surface layer for a complete Sol belonging to the Pathfinder mission. All these magnitudes have been derived from in situ wind and temperature measurements at around 1.3
m height, and simulated ground temperature (from 6 a.m. Sol 25 to 6 a.m. Sol 26).

Tema: general: 

• Ciencias›Física

Transient Simulation of Two-Phase On-chip Liquid Pump Cycle for Processor's Cooling

REA Auditado

Transient modeling and regulation of a two-phase on-chip liquid pump cooling cycle is studied. The purpose is to cool down multiple micro-processors in parallel and a set of memories, DC/DC converters in series. The cycle will be incorporated in a blade/drawer of a rack as shown in Figure 1. The cooling system is composed of multiple on-chip micro-evaporators, a condenser, a liquid accumulator, a pump and all piping joining components. In order to take advantage of enhanced heat transfer and more uniform chip temperature, two-phase refrigerant R134a is used as working fluid.

Tema: general: 

• Ciencias

Path Integral Monte Carlo Simulations of Helium: From Superfluid Droplets to Quantum Crystals

REA Auditado

Below Tλ = 2.17 K, bulk 4He is a superfluid and has a non-zero Bose-Einstein condensate
fraction. This work will focus primarily on how phenomena such as superfluidity,
Bose condensation and superfluid vortices are manifested in microscopic, inhomogeneous
helium systems. Path Integral Monte Carlo is a powerful method for calculating
the equilibrium properties of quantum systems at finite temperature.

Tema: general: 

• Ciencias›Física