SGEA1000 5761011-5F 5741167B 模拟量输入控制卡 ABB
.开发替代方案。首先问一个问题，我们是否需要
这件事，这项服务？或者我们是习惯还是传统？
如果需要该功能，那么询问，我们还可以如何实现
目标相同吗？我们是否可以合理地降低我们的期望，或者可以接受地降低我们努力的程度？我们能否消除多余的材料（使其更轻或更小）？我们能换一个少一点的吗
昂贵的组装？我们能消除一部分装配劳动吗？我们可以将一系列多尺寸单元标准化为几个吗
组件？
在这个阶段，我们学会了不去批评，不去评价，因为“疯狂”产生了“赢家”不要对你不感兴趣的事情感到沮丧
要有创造力，思想开放。把想法写下来。
3.评估备选方案。开发了不同的想法
做同样事情的方法，现在评估每个备选方案的客观和主观优势和劣势。性能研究
暖通空调工程基础：1部分
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4.一章
相对于建造和运营的成本成本。寻找能以低的总体成本运行良好或更好的替代方案。这
通常是与原始解决方案不同的解决方案。
请注意，仅为降低成本而进行的分析工作是：
这不是真正的价值工程；以小化生命周期为目标
成本经常受到影响。这个国家有足够的建筑物
华丽的装饰和不舒适的居住者证明了这一说法。正如约翰·罗斯金多年前所说：
付出太多是不明智的，但付出太少更糟糕。当你
付出太多你会损失一点钱。当你付得太少的时候，你有时会失去一切，因为你买的东西不能
做它被买来做的事。商业平衡的普通法
禁止付出一点而得到很多，这是不可能的。如果你处理
对于出价低的投标人，好为你的风险增加一些东西。
如果你这样做，你将有足够的钱买更好的东西。
4.销售佳解决方案。这又回到了许多人的弱点
工程师和设计师：他们有伟大的想法，但他们有困难
现在是实施这些想法的时候了。通过首先了解设备或系统的用途，然后产生好的数据来理解
当前的性能，以及终开发一个具有记录可行性的替代方案，极大地支持了销售工作。
气体强制通风炉是HVAC装置的一个示例，该装置具有：
随着时间的推移，通过价值工程进行了改进。的目的
熔炉现在和以前一样，是利用燃料的化学能来加热
环境，即加热房屋。但是，20世纪30年代的熔炉与今天的高科技熔炉有着天壤之别，它有铸铁或重金属耐火材料衬里的火箱和直径为4英尺的阀盖。尺寸减少，容量增加，重量增加
相对成本降低，燃料燃烧效率提高，可靠性提高。
泵和风扇的变速驱动装置具有：
已改进到通用应用的程度。经营成本
降低速度以“匹配负载”的优势已为人所知
并在工业中使用了很长时间
SGEA1000 5761011-5F 5741167B 模拟量输入控制卡 ABB
SGEA1000 5761011-5F 5741167B 模拟量输入控制卡 ABB
. Develop alternatives. First ask the question, Do we even need
this thing, this service at all? Or are we into it by habit or tradition?
If the function is needed, then ask, How else could we accomplish the
same objective? Could we reasonably reduce our expectation or acceptably reduce the magnitude of our effort? Could we eliminate excess material (make it lighter or smaller)? Could we substitute a less
expensive assembly? Could we eliminate an element of assembly labor? Could we standardize a line of multisize units into just a few
components?
In this phase, we learn not to criticize, not to evaluate, for the ‘‘crazies’’ spawn the ‘‘winners.’’ ‘‘Don’t be down on what you are not up on.’’
Be creative and open-minded. Keep a written record of the ideas.
3. Evaluate the alternatives. Having developed ideas for different
ways of doing the same thing, now evaluate the objective and subjective strengths and weaknesses of each alternative. Study performance
HVAC Engineering Fundamentals: Part 1
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4 Chapter One
versus cost—cost both to construct and to operate. Look for the alternative which will work as well or better for the least overall cost. This
will often be a different solution from the original.
Note that an analysis effort solely for the purpose of cutting cost is
not really value engineering; for the objective of minimized life cycle
cost is often compromised. There are enough buildings in this country
with fancy finishes and uncomfortable occupants to attest to this assertion. As John Ruskin said many years ago:
It is unwise to pay too much but it is worse to pay too little. When you
pay too much you lose a little money. When you pay too little you sometimes lose everything, because the thing you bought was incapable of
doing the thing it was bought to do. The common law of business balance
prohibits paying a little and getting a lot—it can’t be done. If you deal
with the lowest bidder it is well to add something for the risk you run.
And if you do that you will have enough to pay for something better.
4. Sell the best solution. This ties back into a weakness of many
engineers and designers: They have great ideas, but they have a hard
time getting these ideas implemented. By first understanding the purpose of a device or system, then producing good data to understand
current performance, and finally developing an alternative with documented feasibility, the sales effort is greatly supported.
Gas forced-air furnaces are an example of an HVAC unit which has
been improved over time by value engineering. The purpose of the
furnace now, as before, is to use the chemical energy of a fuel to warm
the environment, i.e., to heat the house. But there is a world of difference between the furnace of the 1930s, with its cast-iron or heavymetal refractory-lined firebox and 4-ft-diameter bonnet, and the hightechnology furnaces of today. Size is down, capacity is up, weight is
down, relative cost is down, fuel combustion efficiency is up, and reliability is debatably up.
Variable-speed drives for pumps and fans are devices which have
been improved to the point of common application. The operating-cost
advantages of reduced speed to ‘‘match the load’’ have been known
and used in industry for a long tim
SGEA1000 5761011-5F 5741167B 模拟量输入控制卡 ABB
