NXPP-06C NXPP06C 应用于DCS系统适配器主板 ABB
管理和规范建筑施工、产品设计和制造、工程师资格的IOU规范和条例
实践等。规范通常在以下基础上具有法律效力
保护公共安全和福利。可施加处罚
对于违反既定规范的人，以及违规装置
可能会被谴责，并被视为不适用于强制执行
当局。作为年轻的设计从业者，我们被建议“卷曲”
直到我们完全熟悉
它的戒律。
对于建筑物的结构，规范特别明确
完整性、电气安全、管道卫生、燃油设备
和系统、防火探测和保护、生命安全和
残疾人无障碍建筑、节能、室内空气
这些区域中的每一个都对HVAC的设计有影响
系统。
特定的代码在采用和实现上有足够的多样性，因此本书列出任何细节都是不明智的。这个
暖通空调系统设计师只需知道，生活并非没有
限制该系统将符合规范，否则将获得建造许可
并且将拒绝使用；而设计师故意违反规范只会带来极大的个人风险。
每个暖通空调设计任务的推荐做法是：
对当地执行的法规和条例进行初步审查，
彻底熟悉适用段落，并
虔诚地遵循规定的做法，即使这种做法似乎会扼杀创造力。
有时，代码约束似乎违反或干扰
构造的目标。在这种情况下，通常可以向管理局请求变更。没有接受的保证，但没有冒险，没有收获。良好的准备会带来希望和理解，并将您与
无休无止的骗子为了个人的经济利益而逃避法规和规章。
暖通空调工程基础：1部分
下载自数字工程图书馆@McGraw-Hill（www.digitalengineeringlibrary.com）
版权所有©2004麦格劳-希尔公司。版权所有。
任何使用均受网站上给出的使用条款的约束。
6.一章
尽管存在差异程序，但一般而言，好的方法是
了解代码并在其中进行设计。有关本主题的进一步讨论，请参阅参考文献2。
1.5流体力学*
流体力学是物理学的一个基本领域
流体在静止和运动时的行为。它涉及财产
指流体，如密度和粘度，并涉及
物理，如热力学和传热，增加了
基本流体流功能的能量问题。就这一点而言
在提醒段落中，请记住：
流体系统中某点的静压与流体密度和流体柱高度成正比。静态压力在所有方向上施加相等。
流动流体的速度压力与平方成正比
流体速度；i、 即速度倍增，速度压力倍增。
管道中流动的流体的摩擦损失与
速度的平方。
移动流体所需的泵送功率与
流体密度
NXPP-06C NXPP06C 应用于DCS系统适配器主板 ABB
NXPP-06C NXPP06C 应用于DCS系统适配器主板 ABB
ious codes and ordinances which govern and regulate building construction, product design and fabrication, qualification of engineers in
practice, etc. Codes generally are given the force of law on the basis
of protecting the public safety and welfare. Penalties may be applied
to those who violate established codes, and the offending installation
may be condemned and regarded as unsuitable for use by enforcement
authorities. As young design practitioners, we were advised to ‘‘curl
up with a good code book’’ until we became thoroughly familiar with
its precepts.
Codes are particularly definitive regarding a building’s structural
integrity, electrical safety, plumbing sanitation, fuel-fired equipment
and systems, fire prevention detection and protection, life safety and
handicapped accessibility in buildings, energy conservation, indoor air
quality, etc. Each of these areas has an impact on the design of HVAC
systems.
Particular codes are sufficiently diverse in their adoption and implementation that it is unwise for this book to list any specifics. The
HVAC system designer should simply know that life is not without
constraint; that systems will conform to codes, or else a permit to build
and use will be denied; and that willful violation of codes by the designer is done only at great personal risk.
The recommended practice for every HVAC design assignment is to
make an initial review of the locally enforced codes and regulations,
to become thoroughly familiar with the applicable paragraphs, and to
religiously follow the prescribed practices, even though such an approach seems to stifle creativity.
Occasionally code constraints seem to violate or interfere with the
objective of a construction. At these times, it is often possible to request a variance from the authority. There is no guarantee of acceptance, but nothing ventured, nothing gained. Good preparation generates hope and understanding, and differentiates you from the
unending stream of charlatans who seek to sidestep codes and regulations for personal financial gain.
HVAC Engineering Fundamentals: Part 1
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Copyright © 2004 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.
6 Chapter One
Variance procedures notwithstanding, in general the best idea is to
know the codes and to design within them. See Ref. 2 for further discussion of this topic.
1.5 Fluid Mechanics*
Fluid mechanics, a fundamental area of physics, has to do with the
behavior of fluids, both at rest and in motion. It deals with properties
of fluids, such as density and viscosity, and relates to other aspects of
physics, such as thermodynamics and heat transfer, which add the
issues of energy to the functions of the basic fluid flow. For this brief
reminder paragraph, remember:
The static pressure at a point in a fluid system is directly proportional to the density of the fluid and to the height of the fluid column. Static pressure is exerted equally in all directions.
The velocity pressure of a flowing fluid is proportional to the square
of the fluid velocity; i.e., doubling the velocity quadruples the velocity pressure.
The friction loss of a fluid flowing in a conduit is proportional to the
square of the velocity.
The pumping power required to move a fluid is proportional to the
fluid density
NXPP-06C NXPP06C 应用于DCS系统适配器主板 ABB
