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In the current energy context, significant reductions in energy demand must be made in the building sector which is the biggest energy-consumer among all economic sector and whose consumption can be greatly reduced through the promotion of low energy buildings obtained from the optimization of the envelope and which is an effective way to reduce emissions of greenhouse gas and slow the depletion of...
The aim of this study is to investigate the benefits of pitch insulation and ceiling insulation for air-conditioned buildings in the tropical climate of Malaysia. These are performed via computer simulations using a whole-building thermal energy software Integrated Environmental Solution (IES) with Apache Sim 6.0.2. The benefits are appraised by the thermal impact and the cooling load in three cooling...
In order to accurately know the temperature field around a fixed anchorage and the heat loss of buried pipe we used the numerical simulation technology to simulate the temperature field in fixed anchorage of buried heating pipes, then, we got the intuitive temperature distribution figure and the size of heat loss. The simulation results indicate the necessity of effective insulation measures for fixed...
Steam pipelines play an important role in industrial enterprises. They joint the heat producer and users, and constitute the energy transmission networks. The total cost on steam pipelines include the expense of steel and heat insulator, converted expense of heat loss, and construction cost. This study develops a mathematical model of total cost on steam pipelines with golden section algorithm. The...
Based on the geological conditions of cut and cover tunnel of the South to North Water Transfer Project, lining temperature field for crack control is simulated by finite element software-ANSYS. Through simulation of hydration heat effects, large temperature difference areas can be identified quantitatively, thermal insulation and sprinkler maintenance can be carried on during the initial setting...
In a normal diesel engine, about thirty percent of the total energy is rejected to the coolant. The low heat rejection concept is based on suppressing this heat rejection to the coolant and recovering the energy in the form of useful work. The purpose of this project is to increase the performance of the engine and improved the fuel economy resulting from coating those using partially stabilized zirconia...
Polyimide (PI) is a widely used wiring insulation material for aircraft. Given the harsh environment of its employment, wiring insulation material for aircraft suffers from various degradation processes which may cause failure of electrical insulation. In this paper, the dielectric response of PI to thermal degradation and to saline exposure is investigated. To investigate the effect of thermal exposure,...
Space heating accounts for the greatest energy consumption in cold regions of China. Proper application of thermal insulation is one of the most effective energy conservation measures for residential buildings. Therefore, determining and selecting the optimum thickness of insulation is important not only for the environment but also for the energy costs. In this paper, a mathematical model demonstrating...
Laminar natural convection in a two-dimensional inclined square enclosure has been numerically studied using finite volume method. The research deals with the investigation of the effect of Prandtl number and inclination angle on the stream contours and isotherms in this enclosure where the left side wall is maintained at isothermal hot temperature, while the opposite side wall is maintained at isothermal...
External thermal insulation system (ETIS) is an important part of building energy efficiency. Polyurethane foam as a superior external insulation material was analyzed in this paper. The variation law of bond strength of the ETIS with polyurethane foam was studied by atmospheric exposure tests which consist of two stages including high temperature-spraying water cycle and heating-refrigeration cycle...
Permafrost area in china is about 2.15×106km2, and mainly distributed in Tibetan Plateau, Northeast china and Midwest mountains. Although engineering construction increased gradually in permafrost regions with the development of society and science technology, there was no precedent for the airport construction in permafrost regions two years ago. Mo-he airport, the first airport in permafrost region...
Wall insulation is one of the commonly used energy-saving measures. But many factors, such as climate, building type and indoor heat gain, have great influence on the effectiveness of building insulation. In this paper, the influence of thickness of building insulation layer on the building HVAC energy consumption has been analyzed for three different indoor heat gain, 20, 50, 80 W/m2, for an office...
The thermal conductivities of wall material were measured under various water contents to investigate the effect of water content on the thermal insulation properties. The results show that water contents have adverse impact to heat insulation of wall materials. The heat insulation of wall materials decreased with the increasing temperature. Sensitivity of the red block to water contents is larger...
Often, the printed circuit boards (PCB) for power applications are manufactured with some traces thickened by a deposit of soldering alloy. The reason for such a design feature comes from the thermal management requirements: as it is believed that this would significantly increase the current carrying capability of the trace. At a first view, such a statement might seem to make sense: thickening the...
Garment fitness is influenced by garment pattern, human body shape, garment size and fabric drape. To investigate the effect of garment fitness on human body heat transfer, six different sized men's shirts with increasing chest circumference from 91cm to 111cm are tested. A thermal manikin with adjustable joint is used to test the thermal insulations and an infrared thermal camera is used to quantify...
Two kinds of ultrafine polyester nonwoven wadding different in weight were tested, and two kinds of hollow-core polyester wadding available in market were chosen as contrast. Then four clothing ensembles which were filled in four different kinds of thermal materials respectively were made. The contents of tests involved material properties and clothing wearing comfort (through objective thermal manikin...
We have achieved the first complete, non-instrumented nucleic acid amplification test (NAAT) using a calcium oxide heat source thermally linked to an engineered phase change material. These two components alone maintain a thermal profile suitable for the loop-mediated isothermal amplification assay. Starting with computational fluid dynamics analysis, we identified nominal geometry for the exothermic...
This paper reports the design, fabrication, and testing of a multilayer cantilever structure having a doped silicon heater-thermometer separated from the silicon cantilever legs by a thermally insulating silicon nitride layer. The multilayer microcantilever can be heated above 600??C. Highly sensitive thermal topography measurements were successfully demonstrated on a 20 nm tall silicon grating. The...
A control system to regulate the temperature of the micro hotplate in a MEMS gas sensor is presented. The controlelement, called micro hotplate, is comprised of a micro heater and a temperature sensor, both made with polysilicon, located near each other. This material has a Temperature Coefficient of Resistance (TCR) that is the basis for the design of the temperature controller of the gas sensor...
The text researched the insulation work of fiberglass frame when it supports in favor of temperature difference. According to the require, we designed and calculation the insulating work layer thickness size h of the fiberglass frame member. Adopting finite element analysis, we calculated the thermal field in temperature difference inside and outside the fiberglass frame member, analyzing the property...
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