Xem 1-20 trên 54 kết quả Heat distribution
  • Tham khảo sách 'electricity for refrigeration,heating and air conditioning', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf740p nguyenthai_thinh 16-03-2013 46 20   Download

  • From this Chapter we will study thermal properties of matter, that is what means the terms “hot” or “cold”, what is the difference between “heat” and “temparature”, and the laws relative to these concepts. We will know that the thermal phenomena are determined by internal motions of molecules inside a matter. There exists a form of energy which is called thermal energy, or “heat”, which is the total energy of all molecular motions, or internal energy.

    pdf37p thanhan 22-07-2009 91 8   Download

  • Installation of new system. When no existing system is present, the designer must select the system that is most appropriate for the end user. High temperature hot water and steam/condensate systems are the most common types of distribution systems currently used on military installations. However, a new system should only use the temperatures and pressures necessary to meet the requirements…

    pdf143p kennybibo 14-07-2012 38 8   Download

  • Many of the techniques that have been developed have already been used to study the extent and distribution of variation in species gene-pools and to investigate evolutionary and taxonomic relationships among plant populations. With the development of the polymerase chain reaction (PCR) based techniques, in particular, numerous molecular technologies have been, and still are being, developed, which can be used for the detection, characterization, and evaluation of genetic diversity in plant populations.

    pdf394p conquynho32 18-09-2012 25 5   Download

  • The proportion of public domain content in the HathiTrust Digital Library is relatively small (approximately 16% of titles in June 2010) and typically represents material that is not widely held in the library system; as a result, the number of libraries that might hope to reduce local print management costs for these titles through negotiated agreements with the HathiTrust and shared print providers is quite low. Moreover, the age and subject distribution of titles in the public domain is not representative of academic research collections as a whole.

    pdf110p yeurauxanh88 01-10-2012 25 3   Download

  • Tham khảo sách 'refrigeration: the process of removing heat', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf384p ngoctu239 27-11-2012 11 1   Download

  • Electrical machines are almost entirely used in producing electricity, and there are very few electricity-producing processes where rotating machines are not used. In such processes, at least auxiliary motors are usually needed. In distributed energy systems, new machine types play a considerable role: for instance, the era of permanent magnet machines has now commenced. About half of all electricity produced globally is used in electric motors, and the share of accurately controlled motor drives applications is increasing.

    pdf531p nguyenthai_thinh 21-03-2013 46 23   Download

  • I. Introduction An important aspect of nuclear reactor core analysis involves the determination of the optimal coolant flow distribution and pressure drop across the reactor core. On the one hand, higher coolant flow rates will lead to better heat transfer coefficients and higher Critical Heat Flux (CHF) limits. On the other hand, higher flows rates will also in large pressure drops across the reactor core, hence larger required pumping powers and larger dynamic loads on the core components.

    ppt259p giotletinh_hd2009 20-04-2013 55 16   Download

  • An engine or motor is a machine designed to convert energy into useful mechanical motion.[1][2] Heat engines, including internal combustion engines and external combustion engines (such as steam engines) burn a fuel to create heat which is then used to create motion. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air and others, such as clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors like myosins in muscles use chemical energy to create motion....

    pdf107p khangoc239 10-08-2012 23 9   Download

  • With global populations on the rise and the increasing threat associated with climate change, the need for the development of low emission energy resources is clear. Geothermal energy, which originates from the underground heat of the earth (Sankaran, 2002), has the advantage of being a low-emission, baseload energy resource. Unlike other alternative energy resources, geothermal energy production does not fluctuate with time of day or season.

    pdf0p aries23 29-09-2012 53 8   Download

  • The purpose of this manual is to provide the reader with a fundamental understanding of controls and how they are applied to the many parts of heating, ventilating, and air conditioning systems in commercial buildings. Many aspects of control are presented including air handling units, terminal units, chillers, boilers, building airflow, water and steam distribution systems, smoke management, and indoor air quality.

    pdf518p quanghuubka 02-07-2014 38 7   Download

  • Although health economics provides a useful starting point for such analyses of coverage, the ultimate effect of a mandate is not easily reduced to, and in fact could differ from, the predicted effect of treating penalty amounts as dollar-for-dollar equivalents to subsidies. People can respond to penalties and subsidies differently and in ways that are not considered in standard health economics models.

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  • The chemical composition of bamboo is similar to that of wood. Table 2-2 shows the chemical composition of bamboo [Higuchi 1957]. The main constituents of bamboo culms are cellulose, hemi-cellulose and lignin, which amount to over 90% of the total mass. The minor constituents of bamboo are resins, tannins, waxes and inorganic salts. Compared with wood, however, bamboo has higher alkaline extractives, ash and silica contents [Tomalang et al. 1980; Chen et al. 1985]. Yusoff et al.

    pdf236p loixinloi 08-05-2013 24 5   Download

  • Natural gas has traditionally been used as a feedstock for the chemical industry, and as a fuel for process and space heating. Recent advances in exploration, drilling techniques and hydraulic fracturing have made it possible for natural gas to become available in abundance (as of 2012). As natural gas displaces traditional petroleum use in various sectors, a certain amount of disruption is likely.

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  • Some southern producers also feel that premiums for buy-up coverage or revenue products are not affordable, leaving catastrophic policies (with minimal coverage) as the only viable option for many farmers. More broadly, some farm groups have requested that current subsidies be maintained or increased so premiums would be more affordable. 28 Corn producers want their premiums reduced because the loss ratio has been well below 1.0 (indemnities paid divided by premiums).

    pdf20p quaivatxanh 29-11-2012 23 4   Download

  • Before 1999, PBgC did not make lump-sum payments to insolvent multiemployer plans or those expected to become insolvent in the future. it now does so in select cases to close out a plan or to facilitate a merger with another, financially stronger multiemployer plan. in a closeout, the plan either purchases annuities from the private insurance market to satisfy its obligations or pays participants lump sums in lieu of annuities.

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  • Hydraulic fracturing is an industrial process used to extract fossil fuel reserves that lie deep underground. With the introduction of horizontal drilling, new commercial sources of energy have become available. Wells are drilled and injected with large quantities of water mixed with specially selected chemicals at high pressures that allow petroleum reserves to flow to the surface. While the increased economic activities and the outputs of domestic energy are welcomed, there is growing concern over negative environmental impacts from horizontal drilling in shale formations.

    pdf12p tainhacmienphi 19-02-2013 19 4   Download

  • Tham khảo sách 'facilities criteria (ufc) heating and cooling distribution', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf143p khangoc2391 11-08-2012 23 3   Download

  • The engineering field requires an understanding of core concepts including mechanics, kinematics, thermodynamics, materials science, structural analysis, and electricity. Mechanical engineers use these core principles along with tools like computer-aided engineering and product lifecycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices, and others.

    pdf302p ngoctu239 27-11-2012 17 3   Download

  • Cloning in essence means ‘making an exact copy’. Cloning of cells is a commonplace procedure in the life sciences and reproductive cloning of some animals is now possible. Dolly, the sheep was the fi rst such mammal to be born, in 1997. 1 Although there has been some opposition to the cloning of mammals, by and large it has been generally accepted by society, however, it has brought the possibility of the cloning of human beings too close for comfort. While the majority of people do not support cloning of human beings, there are a small minority that do largely base...

    pdf601p thankinhphanliet 21-12-2012 18 3   Download

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