overall heat transfer coefficient
Experimental investigation and comparison of heat transfer coefficient of a two phase closed thermosyphon
Ngày tải lên :
09/09/2015, 10:32
... In this study the heat transfer coefficient of condenser and evaporator and the heat transfer limits were investigated The analytical heat transfer coefficient and the heat transfer limits and ... for FR=15% Figure shows their experimental data for heat transfer coefficient Figure shows the heat transfer coefficient in evaporator versus heat flux for correlations of Rohsenow [2], Eq(8) for ... condensation and evaporation heat transfer coefficient increases as filling ratio increases Maximum of the heat transfer coefficient of condenser is at about 40°
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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
... -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 ... A1 B − A2 B − B − m )cos πz , (50) τz = − εα A1 A2 sin π z π 3.2 Rate of heat transfer The rate of heat transfer i.e heat flux at the wall in terms of Nusselt number (Nu) is given by ⎛ dθ ⎞ ⎛ ... 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 2009, 52, 5962-5969 S S...
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Cooling load optimization of an irreversible refrigerator with combined heat transfer
Ngày tải lên :
05/09/2013, 15:28
... a new generalized heat transfer law including generalized convective heat transfer law and generalized radiative heat transfer law has been derived [11] The heating load and coefficient of performance ... the heat transfer area, h is the convection heat transfer coefficient between the working fluid and the reservoir, σ is Stefan-Boltzmann coefficient, ε is the emittance coefficient of the heat ... area, h is the convection heat transfer coefficient between the working fluid and the reservoir, and t is the time of releasing heat process The radiation heat transfer coefficient of the hot side...
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Ecological performance of a generalized irreversible Carnot heat engine with complex heat transfer law
Ngày tải lên :
05/09/2013, 15:28
... overall heat transfer coefficient and F1 is the heat- transfer surface area of the hightemperature-side heat exchanger , β is the overall heat transfer coefficient and F2 is the heat- transfer surface ... Carnot heat engine with the losses of heat resistance, heat leakage and internal irreversibility, in which the heat transfer between the working fluid and the heat reservoirs obeys a complex heat transfer ... Carnot heat engine with the losses of heat- resistance, heat leakage and internal irreversibility, in which the heat transfer between the working fluid and the heat reservoirs obeys a complex heat transfer...
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Heat transfer and friction factor characteristics using continuous M shape ribs turbulators at different orientation on absorber plate solar air heater
Ngày tải lên :
05/09/2013, 15:28
... The heat transfer between absorber plate and air can be enhanced either by increasing the heat transfer surface area using extended and corrugated surface or by increasing the convective heat transfer ... outlet temperature of air (K) Step III: The heat transfer coefficient is to be calculated by h= Qu Ap T p − T f ( ) (6) where h is convective heat- transfer coefficient (W/m2K), Tp is average plate ... Glicksman L.R., Rohsenow W.M Heat transfer and friction for rib roughened surfaces Internatinal Journal of Heat Mass Transfer 1978, 21, 1143-56 [5] Han J.C Heat transfer and friction in channels...
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An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
Ngày tải lên :
05/09/2013, 16:10
... with the enhancement of heat transfer to correlate the flow field investigation with the mechanism of heat transfer Experimental setup Two experimental set-ups, one for heat transfer analysis and ... Journal of Heat Transfer, 106, 774-781, 1984 [3] Han J.C., Glicksman LR and Rosenow WM Investigation of heat transfer and friction for ribroughened surfaces, Int Journal of Heat & Mass Transfer ... augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated wall in transverse, inclined, V-continuous and V- discrete pattern Int Journal of Heat Mass Transfer...
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Heat transfer enhancement through inner grooved copper tubes with different tube parameters
Ngày tải lên :
05/09/2013, 16:10
... from the overall heat transfer coefficient and the annulus side heat transfer coefficient, ho, which is determined using the modified Wilson plot technique [43] The overall heat transfer coefficient ... evaluate the heat transfer coefficients of internally grooved copper tubes 3.1 Test facility The test used to conduct this study is capable of measuring in-tube average and local heat transfer coefficients ... copper tubing, the refrigerant side heat transfer coefficient is then determined as, hi = ⎛ 1 ⎞⎛ Ai ⎜ ⎟⎜ − ⎜U ho ⎟⎜ Ao ⎝ o ⎠⎝ ⎞ ⎟ ⎟ ⎠ (10) The heat transfer coefficient determined in this equation...
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The Thermodynamics, Heat Transfer, and Fluid Flow Fundamentals Handbook
Ngày tải lên :
22/10/2013, 10:15
... simply as the heat transferred per unit mass q Q m (1-16) where: q = heat transferred per unit mass (Btu/lbm) Q = heat transferred (Btu) m = mass (lbm) Example: Determine the heat transferred per ... J Conduction Heat Transfer, Addison-Wesley Pub Co., California Holman, J P., Heat Transfer, 3rd Edition, McGraw-Hill, New York Knudsen, J G and Katz, D L., Fluid Dynamics and Heat Transfer, McGraw-Hill, ... into an equivalent amount of heat and that heat could be converted into work EO 1.8 DEFINE the following: a Heat b Latent heat c Sensible heat d Units used to measure heat EO 1.9 DEFINE the following...
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Tài liệu HEAT TRANSFER FUNDAMENTALS P1 ppt
Ngày tải lên :
23/01/2014, 07:20
... resistance yields an overall heat transfer coefficient U Usage of this term allows the overall heat transfer to be defined as q = UAhT Table 43.8 shows the overall heat transfer coefficients for ... heat transfer, phase change heat transfer, that is, boiling and condensation, will be treated as a subset of convection heat transfer 43.2 CONDUCTION HEAT TRANSFER The exchange of energy or heat ... to as radiant energy and the heat transfer process that occurs is called radiation heat transfer or simply radiation In this mode of heat transfer, the energy is transferred through electromagnetic...
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Tài liệu HEAT TRANSFER FUNDAMENTALS P2 pdf
Ngày tải lên :
23/01/2014, 07:20
... The heat transfer from a surface to a liquid is due to both convection and radiation A total heattransfer coefficient is defined by the combination of convection and radiation heat- transfer coefficients ... (1930) A J Chapman, Heat Transfer, Macmillan, New York, 1974 S Whitaker, AICHE J 18, 361 (1972) M Jakob, Heat Transfer, Vol 1, Wiley, New York, 1949 10 A Zhukauska, "Heat Transfer from Tubes ... Convection Heat Transfer in Liquids Confined between Two Horizontal Plates," / Heat Transfer 81C, 24 (1959) 17 I Catton, "Natural Convection in Enclosures," in Proc 6th International Heat Transfer...
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heat transfer presentation (Tuan) pptx
Ngày tải lên :
06/03/2014, 20:21
... 30 W/m·oC All the heat generated in the chips is conducted across the circuit board and is dissipated from the back side of the board to a medium at 40oC, with a heat transfer coefficient of 40 ... http://www.csun.edu/~lcaretto Question a: Each chip dissipates: 0.04 W Thermal conductivity: k = 30 W/m.oC Heat transfer coefficient: h = 40 W/m.oC Temperature of front side: T1 = ? Temperature of back side: T2 ... (circuit board conduction, R = L/kA, and convection, R = 1/hA). The area, A = (0.12 m)(0.18 m) = 0.0216 m2. The heat transfer is the 80(0.04 W) = 3.2 W dissipated by the logic chips Question b: Aluminum plate (0.2cmthick, 12cmhigh, and 18cm...
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Heat Transfer Applications for the Practicing Engineer potx
Ngày tải lên :
08/03/2014, 17:20
... Temperature Profiles xi 262 265 Overall Heat Transfer Coefficients 268 Fouling Factors 271 The Controlling Resistance 272 Varying Overall Heat Transfer Coefficients The Heat Transfer Equation References ... History of Heat Transfer REFERENCES E LAYTON, History of Heat Transfer: Essays in the Honor of the 50th Anniversary of the ASME Heat Transfer Division, date and location unknown Y CENGEL, Heat Transfer, ... including those in heat transfer The second Part of the book is concerned with heat transfer principles Topics that receive treatment include steady-state heat conduction, unsteady-state heat conduction,...
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Tutorial lecture on nano heat transfer
Ngày tải lên :
15/03/2014, 23:15
... (2) Nanoscale Data Storage Systems (1) Nanoscale Heat Transfer in Nano Transistors TWO DISRUPTIVE HEAT TRANSFER TECHNOLOIES (1) Nanoscale Heat Transfer in Nano Transistors Silicon substrate (thin ... law for heat convection, and Fourier law for heat conduction in solids Both these cases require the use of nanoscale heat transfer techniques - A radically different from macroscale heat transfer ... energy and thus HEAT Lattice vibration of atoms generates heat Fundamental Mechanisms of Heat Transmission in Matter SUMMARY November 21, 2006 (Nanoscale Heat Transfer) Inter- Molecular Heat Transmission...
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Heat-transfer Equipment potx
Ngày tải lên :
17/03/2014, 14:20
... evaluate the heat- transfer coefficients and area required for each section 12.8 TUBE-SIDE HEAT- TRANSFER COEFFICIENT AND PRESSURE DROP (SINGLE PHASE) 12.8.1 Heat transfer Turbulent flow Heat- transfer ... shell-side heat transfer coefficient Step 11 Step Calculate overall heat transfer coefficient including fouling factors, Uo,calc Collect physical properties Step No Assume value of overall coefficient ... and are recommended for accurate work 12.3 OVERALL HEAT- TRANSFER COEFFICIENT Typical values of the overall heat- transfer coefficient for various types of heat exchanger are given in Table 12.1 More...
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doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 1 of 3
Ngày tải lên :
17/03/2014, 15:00
... simply as the heat transferred per unit mass q Q m (1-16) where: q = heat transferred per unit mass (Btu/lbm) Q = heat transferred (Btu) m = mass (lbm) Example: Determine the heat transferred per ... J Conduction Heat Transfer, Addison-Wesley Pub Co., California Holman, J P., Heat Transfer, 3rd Edition, McGraw-Hill, New York Knudsen, J G and Katz, D L., Fluid Dynamics and Heat Transfer, McGraw-Hill, ... into an equivalent amount of heat and that heat could be converted into work EO 1.8 DEFINE the following: a Heat b Latent heat c Sensible heat d Units used to measure heat EO 1.9 DEFINE the following...
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doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 2 of 3
Ngày tải lên :
17/03/2014, 15:00
... Q ), the overall cross-sectional area for heat transfer (Ao), and the overall temperature difference (∆To) using the overall heat transfer coefficient (Uo) The overall heat transfer coefficient ... Transfer Convective Heat Transfer Coefficient The convective heat transfer coefficient (h), defines, in part, the heat transfer due to convection The convective heat transfer coefficient is sometimes ... not physically connected to the heat transfer site Rev Page HT-02 CONDUCTION HEAT TRANSFER Heat Transfer CONDUCTION HEAT TRANSFER Conduction heat transfer is the transfer of thermal energy by interactions...
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doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 3 of 3
Ngày tải lên :
17/03/2014, 15:00
... Volume of Module - Heat Transfer This module describes conduction, convection, and radiation heat transfer The module also explains how specific parameters can affect the rate of heat transfer Volume ... especially those involving the transfer of heat Frequently, when it is desired to remove heat from the point at which it is generated, some type of fluid is involved in the heat transfer process Examples ... EG&G Idaho, Inc Rev HT THERMODYNAMICS, HEAT TRANSFER, AND FLUID FLOW OVERVIEW The Department of Energy Fundamentals Handbook entitled Thermodynamics, Heat Transfer, and Fluid Flow was prepared...
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Heat Transfer: Basics and Practice ppt
Ngày tải lên :
24/03/2014, 01:20
... definitions 1.1 Modes of heat transfer 1.2 Definitions 1.2.1 Heat (transfer) rate and heat flux 1.2.2 Heat transfer coefficients and overall heat transfer coefficients 1.2.3 ... (2.11) The overall heat transfer coefficient is: 1 1 = + + k α f αW α f (2.12) The reciprocal of the overall heat transfer coefficient is the sum of the reciprocals of the heat transfer coefficients ... of W/(m K) The heat transfer coefficient of the air on both sides has the value of W/(m2 K) Find The heat transfer coefficient of the wall, the overall heat transfer coefficient, heat flux and...
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computational fluid dynamics an heat transfer
Ngày tải lên :
01/04/2014, 10:42
... Developments in Heat Transfer Objectives The Developments in Heat Transfer book Series publishes state-of-the-art books and provides valuable contributions to the literature in the field of heat transfer, ... Compact Heat Exchangers, Engineering Heat Transfer Phenomena, Fins and Fin Systems, Condensation, Materials Processing, Gas Turbine Cooling, Electronics Cooling, Combustion-Related Heat Transfer, Heat ... Transfer, Heat Transfer in Gas-Solid Flows, Thermal Radiation, the Boundary Element Method in Heat Transfer, Phase Change Problems, Heat Transfer in Micro-Devices, Plate-and-Frame Heat Exchangers,...
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