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Radiation cooling causes a non-uniform temperature field in the glass sample. In this case, heat flow arises in the sample and generates mechanical stresses and, as a consequence, optical anisotropy and birefringence. Modulation polarimetry technique for birefringence measuring was used. Phase differences between orthogonal components of linearly polarized light are linearly dependent on a stress...
A single effect one-stage absorption cooling system (ACS) is considered, coupled to a parabolic trough collector (PTC) and a fully mixed water storage tank (ST). Solar energy is absorbed and converted into thermal energy by the use of a PTC. It is then stored as hot water and used for running the desorber of an ACS designed to cover air conditioning cooling needs. Daily cooling loads were considered...
This article discusses application of photovoltaic panels thermal features into complex numerical model. Heating of the panels affects power output and efficiency. This process depends on weather conditions including fast variations of solar radiation. Typical models of PV systems do not speculate about these fast changes. Analysis and simulation of this transient phenomenon is result of this research...
In the present work, a building integrated photovoltaic module (BIPV) is analyzed by passive cooling technique. The effect of incorporating wick in BIPV modules electrical energy conversion efficiency and surface temperatures are studied under different orientations of building. The BIPV module contains window glazing, Polycrystalline solar cells and coir mat wick material. The experimental results...
For gaining an effective cooling performance for motor, water cooling is commonly utilized. But as the requirement for power density increasing, solely the water cooling is not sufficient. This is duo to the thermal resistance of the end winding to the water is large. To obtain lower temperature of the end winding, a new cooling method is studied. The stator and the rotor are separated by an ultrathin...
Due to the increasing amount of energy consumption and CO2 emissions, Building Automation Systems have been developed in order to increase energy performance in buildings and guarantee indoor comfort at the same time. However, along with the development of the hardware itself, the need to develop also suitable control systems and methods for improving the management of smart buildings, is arising...
To reduce warpage of thinner package application such as POP (package on package), the ultra-low CTE (coefficient of thermal expansion) core materials has been developed. The resin system was originally designed by the concept of the combination of the hard and the soft segments. The hard segments composed of a stack structure of aromatic rings and the strong intermolecular force between them, which...
We examine cell cryopreservation method without cryoprotectant agent (CPA). In general, the CPA is supplemented to the freezing medium to inhibit the generation and growth of ice crystals inside and outside the cell because cell structures are destroyed by the ice crystals. On the other hand, we need to think about the cytotoxicity of CPA in the cell cryopreservation. The faster the cooling rate become,...
This contribution proposes a study of the energy nedeed to the greenhouse for a fixed cultivation and with the evaluation of the Levelized Cost Of Energy (LCOE). Since the micro-climate condition is a pre-requisite for each cultivation, then a devoted design is absolutely necessary. For this aim, a comparison has been made among three typologies of structural materials (single glass, polycarbonate,...
The paper deals with the study of the energy necessary to the greenhouse for the roses cultivation. Each cultivation requires specific micro-climate condition, then generic design is not an effective solution. In order to determine the best material to be used, a comparison has been made among three typologies, i.e. single glass, polycarbonate, and double glass. A solution with an integrated PV plant...
The cabin temperature increases sharply and can reach 70°C when the vehicle parks in the summer direct sunlight, which has a bad influence on the occupants entering comfort. At first, based on the theory of thermal, static heat transfer model of cabin is established and the rule of the indoor air temperature changing with time is obtained. After that, ventilation cooling model for car blower is set...
Application of adaptive fuzzy control in the purification of high-temperature gas from glass kiln is presented. With the increasing concern for environmental problems, how to carry on the high-temperature flue gas dedusting economically and effectively has become an important research direction. The adaptive fuzzy control strategy is applied to the temperature control of bag filter, and simulated...
The load of air conditioner has taken a significant percentage of whole social load. The paper firstly constructed a four-node electrical circuit to model the thermal behaviour of a building. And the four-node electrical circuit model was verified by a professional commercial software. Then the loads of heating and cooling systems installing on buildings with different thermal integrity levels were...
A large amount of energy is used in buildings for heating, cooling, ventilation and lighting. Among these applications, the energy consumption for heating and cooling accounts the largest proportion. So, the exploitation of renewable energy sources such as solar energy is the ideal solution for reducing energy costs. In this context, the architecture must be taken into consideration for the use of...
We have measured the temperature dependent changes in the terahertz spectra of three different amorphous polyols: sorbitol, glycerol and xylitol. As samples of each material are heated from temperatures well below its glass transition temperature, Tg, to temperatures close to its melting point a clear change in absorption coefficient at Tg is observed in all three samples. In addition, the spectra...
Optical refrigeration (solid-state laser cooling) is based on the principle of anti-Stokes fluorescence where incident light from a coherent (low entropy) source such as laser is upconverted into high entropy fluorescence via absorption or removal of vibrational energy (phonons) [1]. This phenomenon has been termed “a laser running in reverse” as it mimics the reverse operation of a solid-state laser...
Epoxies are widely used materials, especially in high voltage insulation for its mechanical and dielectric properties. Boron Nitride is an attractive filler because of its high insulating properties associated with a high thermal conductivity. Nanometric Silica used as filler is actually widely studied in the literature and enhancement of dielectric breakdown and insulating properties has been shown...
We present an improved cooling for a high power density UV LED module for a wavelength of 395 nm. The module consists of 98 LED chips soldered on a thick film printed alumina substrate on an area of 2.11 cm2. We investigated cooling by a commercial water cooler as well as by a surface micro cooler developed by our own. Further we describe a technology to replace alumina by aluminum as substrate material...
It is noted that glass is in non-equilibrium state on the way to the thermal equilibrium, that is, a kind of a slow relaxation process and depends on its whole thermal history. It is also known that, in the experimental way, so called the entropy of glass measured by cooling and heating shows respectively lower and upper bounds of the entropy defined by statistical thermodynamics. In this paper, we...
Bulk Cu50Zr42Al8 amorphous coniform shape samples (10mm in diameter at bottom and 80mm in length) were successfully prepared by the arc-melting master alloy in the water-cooled copper crucible and then suck cast in the copper mold. Using the techniques of X-ray diffraction, Optical microscope, SEM and TEM analysis. The experimental investigation of the samples research of axial and radial characteristics...
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