EES官方教程：精通EES V9.x版本方程处理

Engineering

Equation

Solver

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"《EES官方教程：精通EES》是一本由Sanford Klein和Gregory Nellis于2012年编撰的教程，专为EES V9.x及更早版本设计。该教程共600多页，详尽介绍了Engineering Equation Solver (EES)这款强大的工程方程求解器软件。书中涵盖了从获取和安装EES，到如何输入和解决方程式、设置变量信息、使用内置数学函数以及管理特殊格式和单位的各个方面。首先，章节1 'Introduction to EES' 引导读者了解EES的基础。它强调了如何下载并安装EES，包括常规安装步骤和静默安装选项，以适应不同的用户需求。在安装过程中，读者可以学习如何处理软件许可和版权问题，确保遵循国际和联邦的版权法和条约。章节的核心内容围绕着如何高效地使用EES进行方程编辑。这包括如何正确输入方程式，区分小数点与逗号作为分隔符的重要性，以及如何设置变量信息，如初始猜测值、极限和显示格式。此外，教程还教导读者如何利用EES内置的数学函数进行计算，以及如何处理字符串变量和使用$TabStops指令进行格式控制。在编辑方程式时，教程指导读者如何展示数值和设置变量的单位，这对于确保计算结果的准确性和一致性至关重要。此外，对于注释的使用和规则也进行了详细说明，帮助用户编写清晰易懂的代码。《Mastering EES》不仅提供理论知识，还可能包含实战案例和练习，让读者通过实际操作来掌握EES的使用技巧。由于版权保护，未经作者许可，任何未经授权的复制或电子传输都是被禁止的。该教程的发布日期为2012年7月30日，F-Chart Software作为出版社的联系信息也在此处列出。这本书是EES用户的必备参考资料，无论是初学者还是进阶用户，都能从中受益匪浅，提升在工程计算和方程求解中的效率和准确性。"

Chapter 1: Introduction to EES

Installing EES

Installing EES is relatively straightforward, but there are a few options that merit discussion. To

install the program, you will need both the Setup_EES.exe and EES.dft files. These files should

have been provided to you when you purchased the program or by a system administrator if you

obtained the program from your company or institution. There are a few institutions where the

EES.dft file has already been bundled with the setup file. Execute the Setup_EES.exe program

and click the Next button from the Welcome screen. Read the license agreement and, if you

agree, click the I Agree button and then click the Next button. Continue to click the Next button

until you see the Select Destination Directory dialog, shown in Figure 1-1.

Figure 1-1: Select Destination Directory dialog.

For historical reasons, the default directory that EES will be installed into is named EES32. EES

is a 32-bit program, but it will operate on all modern 32-bit and 64-bit Windows operating

systems. You can change the directory name, if you wish, by clicking the Browse button.

Depending on the particular installation program, you will need to copy the EES.dft file to the

directory that you choose to install EES. Click the Next button after you have selected the

directory.

The next window, shown in Figure 1-2, provides several installation options. If selected, the

Install Heat Transfer Library option will install an extensive set of library functions that facilitate

heat transfer calculations. These functions have been developed to accompany the text book

Heat Transfer, by G. F. Nellis and S.A. Klein (2009). Selection of this option is recommended

unless you are sure that you will never be doing any heat transfer calculations. A discussion of

these library functions is provided in Chapter 12.

Two versions of EES are provided in the installation program. One version is specifically

developed to allow 3-dimensional plotting. Checking the Install 3D plotting capability option in

the Select Components dialog will install this version. The only reason for not selecting this

option is that it may be incompatible with the graphic display capabilities of some computer

systems. If EES fails to start after installation then this is likely the problem. In this case,

Chapter 1: Introduction to EES

1.2 Entering and Solving Equations

A mathematical model of an engineering system is based on a system of equations that result

from the application of appropriate theory and simplifications. These equations describe mass,

energy, and entropy balances, rate relations, properties, etc. Modern computer tools, such as

EES, facilitate the solution of the large set of coupled equations that result from the analysis of a

typical engineering system. When you open EES for the first time you will encounter the

Equations Window where the equations that are to be solved are entered. EES allows the user to

enter equations rather than assignments, as are required by most formal programming languages.

This is an important distinction. In an assignment statement, the value of each variable on the

right side of an expression must have been previously determined. An equation is simply a

relationship between variables. Assignments are explicit and can be solved sequentially. A set

of equations may be implicit and nonlinear and must be solved simultaneously and iteratively.

Entering Equations

Consider the following set of equations:

3xy+=

(1-1)

4yz= −

(1-2)

3zx

= −

(1-3)

Equations (1-1) through (1-3) are three non-linear equations in the three unknowns x, y, and z.

However, they are not directly solvable using most formal programming languages (e.g.,

MATLAB or Fortran) because they are equations rather than assignments. In order to solve this

system of equations using a formal programming language, it would be necessary to either

employ an iterative solution technique (e.g., successive substitution) or carry out sufficient

algebra to convert the equations into assignments. Let's take the latter approach here.

Substituting Eq. (1-3) into Eq. (1-2) provides:

yx= −−

(1-4)

Substituting Eq. (1-4) into Eq. (1-1) provides:

73xx+ −=

(1-5)

which can be rearranged:

10 0xx

+− =

(1-6)

Equation (1-6) is a quadratic equation that can be solved using the quadratic formula:

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