refrigeration cooling systems and heat pumps

Cooling load and COP optimization of an irreversible Carnot refrigerator with spin-1/2 systems

Ngày tải lên : 05/09/2013, 15:28

... is heat leakage between hot and cold reservoirs The hot and cold reservoirs are thermal phonon systems Bh and Bc respectively, and the heat leakage arises from the coupling action between hot and ... of heat resistance, internal friction and bypass heat leakage, and studied the optimal ecological performances of the quantum heat engines Besides performance of harmonic and spin-1/2 quantum refrigeration ... equations (58), (67) and (68), for given S1 and S , one can drive the maximum cooling load and corresponding COP of the irreversible quantum Carnot refrigerator with heat resistance and heat leakage...

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Evaluation of heat pumps usage and energy savings in residential buildings

Ngày tải lên : 05/09/2013, 16:10

... the conventional end-uses of heating, cooling and water heating [7] The present work focuses on determining the efficacy of using heat pumps as the main source of heating in eastern North Carolina ... intensity ratio of the heat pumps group) The energy intensity for homes with gas and homes with combination method of heating are 1.7 and 1.9 times the consumption of house with heat pumps Figure Number ... homes that have utilized and relied on heat pumps as their main heating source (test group) and homes that have relied on other heating alternatives such as gas, electricity and a combination of...

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introduction to thermal systems engineering thermodynamics, fluid mechanics, and heat transfer

Ngày tải lên : 02/04/2014, 16:45

... Improving Performance—Superheat and Reheat 198 8.40 Improving Performance—Regenerative Vapor Power Cycle 202 Vapor Refrigeration and Heat Pump Systems 206 8.50 Vapor Refrigeration Systems 207 8.60 Analyzing ... Vapor-Compression Refrigeration Systems 209 8.70 Vapor-Compression Heat Pump Systems 217 8.80 Working Fluids for Vapor Power and Refrigeration Systems 218 8.90 Chapter Summary and Study Guide 218 ... Chapter Summary and Study Guide 177 Problems 178 Vapor Power and Refrigeration Systems 185 Vapor Power Systems 185 8.10 Modeling Vapor Power Systems 185 8.20 Analyzing Vapor Power Systems Rankine...

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Principles of Digital Communication Systems and Computer Networks

Ngày tải lên : 18/09/2012, 10:13

... thức, entropy H = 4.07 bit/ký hiệu Lưu ý: Hãy xem xét câu sau: "I not knw wheter this is undrstandble." Mặc dù thực tế số chữ tích câu bạn làm câu văn Nói cách khác, có nhiều khả dự phòng văn...

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A Study of Channel Estimation for OFDM Systems and System Capacity for MIMO-OFDM Systems

Ngày tải lên : 20/11/2012, 11:28

... studies the channel estimation for OFDM systems and system capacity for MIMO-OFDM systems, this chapter briefly introduces the background of OFDM systems and MIMO systems OFDM is an effective technology ... of OFDM systems 38 2.2.5 Advantages and disadvantages of OFDM systems 39 2.3 MIMO systems 40 2.3.1 Basic MIMO system model 40 2.3.2 Functions of MIMO systems ... for OFDM systems over time varying and frequency dispersive fading channels With the increasing number of mobile phone users and higher demands for wireless services, future communication systems...

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Effect of periodic suction on three dimensional flow and heat transfer past a vertical porous plate embedded in a porous medium

Ngày tải lên : 05/09/2013, 14:58

... A., Das J K., Panda J P Mass transfer effects on MHD flow and heat transfer past a vertical porous plate through a porous medium under oscillatory suction and heat source Int J Heat Mass Transfer ... -6.4648 4.4 Rate of heat transfer The rate of heat transfer at the wall i.e the heat flux in terms of Nusselt number Nu for different values of α and Kp are entered in Table The heat flux at the ... the velocity and temperature of the flow field are solved employing perturbation technique and the effects of the flow parameters on the velocity and temperature of the flow field and also on...

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Natural convection unsteady magnetohydrodynamic mass transfer flow past an infinite vertical porous plate in presence of suction and heat sink

Ngày tải lên : 05/09/2013, 15:28

... effect of heat sink/source parameter S on the velocity of the flow field Curves with S0 correspond to the presence of heat sink and heat source respectively in the flow field The heat source ... Energy and Environment (IJEE), Volume 3, Issue 2, 2012, pp.209-222 220 4.4 Skin friction and rate of heat transfer Variations in the values of skin friction τ and the heat flux i e rate of heat ... plate in presence of constant suction and heat sink and a transverse magnetic field B0 The x′-axis is taken in vertically upward direction along the plate and the y′axis is chosen normal to it...

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Hydromagnetic convective flow past a vertical porous plate through a porous medium with suction and heat source

Ngày tải lên : 05/09/2013, 16:10

... suction and heat flux and transverse magnetic field Let the x′-axis be taken in vertically upward direction along the plate and y′-axis normal to it Neglecting the induced magnetic field and the ... specific heat at constant pressure, Pr is the Prandtl number, Gr is the Grashof number for heat transfer, S is the heat source parameter, Kp is the permeability parameter, Ec is the Eckert number and ... heat source parameter S reverses the effect A growing Prandtl number Pr or magnetic parameter M increases the magnitude of the rate of heat transfer at the wall On the other hand, a growing heat...

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Future Trends- Fourth Generation (4G) Systems and Beyond

Ngày tải lên : 29/09/2013, 21:20

... 2010 and beyond, there is time for 4G research and standards development So far, no 4G standard has been deﬁned and only speculations have been made regarding the structure and operation of 4G systems ... vision of 4G and future mobile and wireless systems Such systems target the market of 2010 and beyond, aiming to offer support to mobile applications demanding data rates of 50 Mbps and beyond ... Fourth Generation (4G) Systems and Beyond 201 the telecommunications scene and the services offered by 4G and future systems are not known yet and as a result aims for these systems may change over...

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Chapter-10-File systems and devices

Ngày tải lên : 22/10/2013, 19:15

... file systems across a network We’ll look at it in Chapter 25 • FreeBSD supports a number of file systems from other popular operating systems You mount the file systems with the mount command and ... groups of rwx: r stands for read permission, w stands for write permission, and x stands for execute permission The three groups represent the permissions for the owner, the group and others respectively ... of file system Local file systems on hard disk are always ufs, and file systems on CD-ROM are cd9660 Remote file systems are always nfs Specify swap partitions with swap, and the proc file system...

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$Dynamical systems and fractals Computer graphics experiments in ascal$

Dynamical systems and fractals Computer graphics experiments in ascal

Ngày tải lên : 26/10/2013, 17:15

... Pascal and the Fig-trees Some Are More Equal Than Others - Graphics on 12.1 Other Systems 12.2 MS-DOS and PS/2 Systems UNIX Systems 12.3 Macintosh Systems 12.4 Atari Systems 12.5 Apple II Systems ... in different operating systems and programming languages The contents apply to MS-DOS systems with Turbo Pascal and UNIX 4.2 BSD systems, with hints on Berkeley Pascal and C Further example programs, ... data, and supercomputers, the success rate of computer-generated predictions stands no higher than 80 per cent Why is it not better? Dynamical Systems and Fractals chemistry and mathematics, and...

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Introduction to statistics, Number Systems and Boolean Algebra

Ngày tải lên : 04/11/2013, 20:15

... understanding of the following subjects: numbering systems used in digital computers and computer programming; Boolean algebra: binomial theorem; statistics, statistical inference, matrices, and ... Mathematics, Introduction to Statistics, Number Systems and Boolean Algebra NAVEDTRA: 14142 Date: We need some information about you: Rate/Rank and Name: SSN: Command/Unit Street Address: City: State/FPO: ... provided by Enlisted Community Managers (ECMs) and other senior personnel, technical references, instructions, etc., and either the occupational or naval standards, which are listed in the Manual of...

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SYSTEMS AND CONTROLS P1

Ngày tải lên : 09/11/2013, 05:15

... involved in systems engineering efforts: systems engineering methods and tools, systems methodology or processes, and systems management Considerably more details are presented in Refs and 2, which ... Organizations and humans, and the understanding of organizational and human behavior Environments and understanding of the diverse interactions of organizations of people, technologies, and institutions ... methods and measurements, systems processes and methodology, and systems management Systems engineers must be aware of a wide variety of methods that assist in the formulation, analysis, and interpretation...

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SYSTEMS AND CONTROLS P2

Ngày tải lên : 09/11/2013, 05:15

... framework both for the design and evaluation of physical systems and for systems that assist in the planning and design of systems 26.5.3 The Development of Aids for the Systems Design Process This ... aspects concerning the systems engineering of large and complex systems We have been concerned especially with systems design engineering and associated information processing and analysis efforts ... Council on Systems Engineering (1), 35-42 (July/September 1994) W R Beam, Systems Engineering: Architecture and Design, McGraw-Hill, New York, 1990 10 D N Chorfas, Systems Architecture and Systems...

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Tài liệu Matlab tutorial for systems and control theory pdf

Ngày tải lên : 12/12/2013, 07:15

... figure Specify orientation of a figure Signals and Systems Commands The following commands are organized by topics in signals and systems Each of these commands has a number of options that extend ... command 1; MATLAB command 2; MATLAB command 3; The name of the m-file for this function is functionname.m and it is called from the MATLAB command line or from another m-file by the following command ... is that commands are saved and can be easily modified without retyping the entire list of commands 6.1.1 Scripts MATLAB script files are sequences of commands typed with an editor and saved in...

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Tài liệu Idea Group - Information Management Support Systems And Multimedia Technology P2 docx

Ngày tải lên : 13/12/2013, 01:15

... this view have already been built and are described in Rich Sidner and Lesh (2001), Babaian, Grosz and Shieber (2002), Ryall, Marks and Shieber (1997), and Ortiz and Grosz (2002) Theories of collaboration ... analysis and design of organizations in multi-agent systems ICMAS-98, Paris, France, 128-135 Fox, M S (1981) An organizational view of distributed systems IEEE Transaction on Systems, Man and Cybernetics, ... declarative specification of preconditions and effects of system’s actions and applies artificial intelligence, automated reasoning, and planning framework and techniques to dynamically recognize...

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Tài liệu Idea Group - Information Management Support Systems And Multimedia Technology P1 doc

Ngày tải lên : 13/12/2013, 01:15

... Using CORBA, Mobile Agents and Web-Based Technologies 298 Dongming Cui, The University of Auckland, New Zealand Jairo A Gutiérrez, The University of Auckland, New Zealand About the Authors ... mind both practitioners and researchers and is, therefore, suitable for both communities The book is also suitable for graduates and undergraduates in support systems and multimedia technology ... argues that a large and complex cooperative information system and its subsystems in a LAN can be modeled by multi-agent organization and basic organization respectively; and that with the BOS...

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Tài liệu A Practical Aproach to Signals Systems and Control pdf

Ngày tải lên : 13/12/2013, 01:16

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Tài liệu Financial Systems and Auditing Test of Control ppt

Ngày tải lên : 22/12/2013, 15:15

... placed Written, sequenced purchase order All outstanding order are kept on the file for chasing May miss out on bulk discounts Best price and quality not obtained Separate ordering department, ... info and order Invoice calculations are checked Payables ledger control account reconciled regularly Sequence check from GRNs to invoices, to ensure complete posting Exception reporting of outstanding ... available and discounts taken Cheque books / stationery kept secure Process Risks Possible Control Procedure Credit Received Credit not accounted for Return goods are accounted for as despatches and...

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Tài liệu FINANCIAL SYSTEMS AND AUDITING ppt

Ngày tải lên : 22/12/2013, 15:15

... information  customer and vendor information  entity objectives and standards  procedure manuals  information about external events, activities and conditions [Hayes, Dassen, Schilder and Wallage, ... overall attitude, awareness, and actions of directors and management regarding the internal control system and its importance in the entity [Hayes, Dassen, Schilder and Wallage, Principles of Auditing ... Management's philosophy and operating style - leadership via control by example; (5) Organizational structure; (6) Assignment of authority and responsibility; and (7) Human resource policies and practices...

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