cross section area of 20 m2 and thickness of 3 cm. If the inner (hot) surface temperature is 600ºC and the thermal conductivity of the material is 0.5 W/mK‚ what is the outer surface temperature? Solution: Tout = 585 °C 1.2 The heat flux through a wood slab 50 mm thick‚ whose inner and outer temperatures are 40°C and 20ºC‚ respectively‚ has been determined to be 40 W/m2. What is the thermal conductivity of the wood? Solution: k = 0.1 W/mK 1.3 A concrete wall‚ which has a surface area of 20 m2 and
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denier‚ to produce three different fabrics of 100% polyester fibers‚ 75% polyester/25% hollow polyester fibers‚ and 55% polyester45% hollow polyester fibers. Four fabric weights were produced: 300‚ 400‚ 500 and 600 g/m2. All samples were bonded using thermal bonding technique. More results were reached and most samples have achieved the expected results for example‚ samples produced with high percentage of hollow fibers have recorded the highest rates of sound absorption whereas samples produced with
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needs. Lighter weight than competing materials‚ reducing fuel consumption during transportation. Extreme durability. Resistance to chemicals‚ water and impact. Good safety and hygiene properties for food packaging. Excellent thermal and electrical insulation properties. Relatively inexpensive to produce. Plastics makes up around 7% of the average household dustbin. Effects of plastic-Curse. Plastics production also involves the use of potentially harmful chemicals‚ which are
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The Chartered Institute of Building CPD 24 Aug 2012 Environmental Living and Building Insulation – Revisited Presented by Mr Winston Lam‚ Envirobuilding Solutions 3 ft ? 20 ft ? 200 ft? Average emission factor of CO2 : 0.7kg CO2e per KWh Each tree can absorb 23kg of C02 throughout its life Building Energy Efficiency Ordinance (Cap. 610‚ Laws of Hong Kong SAR)‚ will be enforced on 21 September 2012. 1. Total annual electricity consumption of HK in
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people are hesitant about their use. This unwillingness is because of several myths that have developed over years and they are still impacting the people. Here are some of the common myths and the reality behind them: • Less energy efficiency – Thermal resistance and the potency to maintain a temperature inside a log house is considered impossible. It is true in case of those DIY strategies‚ where there is always a chance of mistake. However‚ a beautifully designed and well constructed real American
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simple‚ without specific strategies; (three) you will find robust against nature destruction and corrosion resistance‚ and ability to weather-resistant; (four) can withstand a wide array of variants‚ and nonetheless will not collapse. Fixed thermal insulation effect; (5) the superb technological foundation ensures that the coating thickness uniformity‚ additional corrosion-resistant; (six) save on transport costs. Is usually compressed into small volumes and involved in moisture-proof paper
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gases in the atmosphere‚ resulting from human activities such as deforestation and burning of fossil fuels. The effects of global warming are that increasing global temperatures are causing a broad range of changes. Sea levels are rising due to thermal expansion of the ocean‚ in addition to melting of land ice. Amounts and patterns of precipitation are changing. The total annual power of hurricanes has already increased markedly since 1975 because their average intensity and average duration have
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one-time investment is small. Flour mill is widely used in barite‚ calcite‚ potassium feldspar‚ talc‚ marble‚ limestone‚ dolomite‚ fluorite‚ lime‚ activated clay‚ activated carbon‚ bentonite‚ kaolin‚ cement‚ phosphate rock‚ gypsum‚ glass‚ thermal insulation materials such as mohs hardness is not greater than 9.3‚ and the humidity below 6% of non flammable and explosive mineral‚ chemical‚ construction of more than 280 kinds of materials such as high fine milling processing‚ milling equipment within
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P1 AQA – Revision Notes 1. Heat Transfer • Thermal radiation = infra-red radiation (beyond red part of visible spectrum) • Surface of sun is 5500 degrees. • Greenhouse effect is the idea that the earth is a greenhouse‚ and the atmosphere is glass that stops substances exiting or entering. • DARK‚ MATT SURFACES emit more radiation than shiny‚ light ones‚ and absorb radiation better. • Conduction: free electrons are given energy where heated and diffuse – this energy is passed on as electrons
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Green architecture‚ or green design‚ is an approach to building that minimizes harmful effects on human health and the environment. The "green" architect or designer attempts to safeguard air‚ water‚ and earth by choosing eco-friendly building materials and construction practices. Green architecture may have many of these characteristics: • Ventilation systems designed for efficient heating and cooling • Energy efficient lighting and appliances • Water saving plumbing fixtures • Efficient
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