asp net display barcode Boiling Liquids and Condensing Vapors in .NET framework

Creating Denso QR Bar Code in .NET framework Boiling Liquids and Condensing Vapors

Boiling Liquids and Condensing Vapors
Decode QR In .NET Framework
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in VS .NET applications.
Make Quick Response Code In .NET
Using Barcode generator for Visual Studio .NET Control to generate, create QR Code image in .NET framework applications.
Whenever level cont rol is to be effected on a boiling liquid or condensing vapor, properties more typical of t,hermaI processes appear. Transfer of both heat and mass is involved, which, combined with the integration of flow into level, renders cont rol surprisingly difficult. Level control in boilers and distillation columns is sufficient ly problematic to warrant special consideration, which is given in Chaps. 8, 9, and 11.
QR Code Reader In .NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications.
Barcode Printer In Visual Studio .NET
Using Barcode generation for .NET Control to generate, create barcode image in Visual Studio .NET applications.
TEMPERATURE CONTROL
Recognize Barcode In Visual Studio .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Denso QR Bar Code Creator In C#.NET
Using Barcode generator for .NET framework Control to generate, create QR image in VS .NET applications.
Temperature-cont,rol problems are really heat transfer problems, whether the mechanism is radiation, conduction, or convection. Al-
Printing QR Code ISO/IEC18004 In VS .NET
Using Barcode generator for ASP.NET Control to generate, create QR image in ASP.NET applications.
Make QR-Code In VB.NET
Using Barcode generator for .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
Analysis of Some Common Loops
EAN-13 Encoder In .NET
Using Barcode drawer for .NET Control to generate, create UPC - 13 image in Visual Studio .NET applications.
Generate Code 39 Full ASCII In Visual Studio .NET
Using Barcode drawer for .NET Control to generate, create Code39 image in VS .NET applications.
Overflow hv,Tcz
GS1 RSS Encoder In Visual Studio .NET
Using Barcode drawer for .NET Control to generate, create GS1 DataBar-14 image in Visual Studio .NET applications.
MSI Plessey Maker In .NET
Using Barcode maker for .NET Control to generate, create MSI Plessey image in VS .NET applications.
Cold water
Read UCC-128 In C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Make UCC - 12 In Java
Using Barcode maker for Eclipse BIRT Control to generate, create UPC-A Supplement 5 image in Eclipse BIRT applications.
F-F,, Tcz
Encoding DataMatrix In None
Using Barcode encoder for Software Control to generate, create ECC200 image in Software applications.
Creating UCC-128 In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create GTIN - 128 image in .NET framework applications.
FIG 3.6. The thermal process contains four interacting lags.
Drawing UPCA In Visual C#.NET
Using Barcode generator for VS .NET Control to generate, create UPC Symbol image in Visual Studio .NET applications.
Universal Product Code Version A Reader In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
though an entire chapter is devoted exclusively to energy control, it is important at this time to assay the general features of the temperature loop in order to establish its place in the classification that has been made.
Create Code 128 In VS .NET
Using Barcode generation for Reporting Service Control to generate, create USS Code 128 image in Reporting Service applications.
EAN / UCC - 13 Creation In Java
Using Barcode creator for BIRT reports Control to generate, create EAN-13 image in Eclipse BIRT applications.
Example of a Constant Parameter System
Because most heat transfer processes have variable parameters-heat transfer coefficient, dead time, etc.-which vary wit,h flow, care has been taken to choose an example free of these complications, to better introduce the subject. The example chosen is that of a stirred tank reactor cooled by a constant flow of liquid circulating through its jacket. The temperature controller, as shown in Fig. 3.6, adds cold water to the circulating coolant, in order to remove the heat of reaction. There are five important dynamic elements in the process: 1. 2. 3. 4. 5. Heat capacity of the contents of the reactor Heat capacity of the wall Heat capacity of the contents of the jacket Lag in the temperature bulb Dead time of circulation
Because all the heat leaving the reactor flows through the walls and into the coolant, the capacities of reactants, walls, and coolant interact. But in view of the slight heat capacity of the bulb, its time constant does not significantly interact with the others. Basically the process is fourcapacity plus dead-time.
Finding the Time Constants
To determine the values of the time constants, an unsteady-state heat balance must be written across each heat transfer surface. The equation
n 1 Ud erstanding Feedback Control
takes the form heat in equals heat out plus heat capacity times rate of temperature rise. Assuming a constant rate of heat evolution (the case of a variable rate will be taken up later), the heat balance at the surface of the reactor wall is
dT = klA(T - TI) + WlCq
where Q = rate of heat evolution, Btu/hr Ici = heat transfer coefficient, Btu/(hr) (ft2) ( F) A = heat transfer area, ft2 T = reactor temperature, F T1 = wall temperature, F IV1 = weight of reactants, lb C1 = specific heat of reactants, Btu/(lb)( F) Rearranging in the standard form, WICK dT T+xJYz=
T1 + i&Ix
(3.13)
The thermal time constant is (3.14) lteactor temperature responds to wall temperature with a time constant of 7i and a steady-state gain of 1. If lc,A is not directly known, Q/(1 TJ may be substituted: 71 = y (7 - TI) By the same token, the temperature of the outside wall of the reactor responds to that of the inside wall with a time constant of = k,A
__ = -CT (T1 - T2)
w2c21
w2c2
where Wz = weight of wall, lb Cz = specific heat of wall, Bt.u/(lb)( P ) lc, = thermal conductivity, Bt u/(hr) (ft2) ( F/in.) I = wall thickness, in. Tz = outside wall temperature Kext,, outside wall temperature responds to coolant temperature with a time constant of (3.17)
Analysis of Some Common Loops
where TVs = weight of jacket contents Cs = specific heat of jacket Ica = heat transfer coefficient T, = average coolant temperature The lag of the temperature bulb can be calculated in the same way as the other time constants: (3.18) where Wq = weight of bulb CJ = specific heat of bulb A4 = surface area of bulb For most types of thermal systems and heat transfer conditions, data on bulb response are already availnble.3
Copyright © OnBarcode.com . All rights reserved.