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SAFT132CBS 57411619D SAFT132 CBS 过程控制板 ABB


SAFT132CBS 57411619D SAFT132 CBS 过程控制板 ABB

有意识地使用以下标准(表4.1)或

无意识地,因为很少正式应用问题解决过程。

1.舒适性或工艺要求。这些要求包括:

温度,一如既往;湿度、通风和加压,有时;如果需要,进行分区以更好地控制。至少在理论上

舒适性要求应优先考虑。在实践中,这一标准有时服从于***成本或***人士的愿望。这种情况很少发生在建筑物居住者身上

在他们的期望中变得更加成熟。工艺要求

并且需要HVAC设计师对该过程及其需求进行***调查。直到流程完全不足:暖通空调系统设计手册

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82第四章

表4.1暖通空调系统标准

设备选择

1.舒适性或工艺要求

2.节能、规范要求

3.***成本与寿命周期成本

4.业主、建筑师和/或设计办公室的愿望

5.空间限制

6.可维护性/可靠性

7.中央工厂与分布式系统

8.简单性和可控性

因此,设计师无法提供足够的暖通空调系统。最

通常,过程的不同部分具有不同的温度、湿度、压力和清洁度要求;最***的

这些可能会影响整个HVAC系统。

2.节能。这通常是一个代码要求,并且

这不是可选的。州和地方建筑法规几乎都包括:

限制使用新的、***能源的要求。***主要指化石燃料来源。可再生能源

包括太阳能、风能、水、地热、废物处理、热能

回收等。最严格的规范禁止任何形式的再热

(再生或可再生资源除外)除非湿度控制

是必要的。这种限制消除了终端再热、双层多区、多区和定容等常用系统

双风管系统,但双风机双风管仍然可行,三风管多区域系统也可接受(见***1章)。

大多数HVAC系统用于proc


SAFT132CBS 57411619D SAFT132 CBS 过程控制板 ABB


SAFT132CBS 57411619D SAFT132 CBS 过程控制板 ABB


SAFT132CBS 57411619D SAFT132 CBS 过程控制板 ABB

, the following criteria (Table 4.1) are used—consciously or

unconsciously—because only rarely is the problem-solving process formally applied.

1. Requirements of comfort or process. These requirements include

temperature, always; humidity, ventilation, and pressurization, sometimes; and zoning for better control, if needed. In theory at least, the

comfort requirement should have a high priority. In practice, this criterion is sometimes subordinated to first cost or to the desires of someone in authority. This is happening less often as building occupants

become more sophisticated in their expectations. Process requirements

are more difficult and require a thorough inquiry by the HVAC designer into the process and its needs. Until the process is fully underSource: HVAC Systems Design Handbook

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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.

82 Chapter Four

TABLE 4.1 Criteria for HVAC System and

Equipment Selection

1. Demands of comfort or process

2. Energy conservation, code requirements

3. First cost versus life-cycle cost

4. Desires of owner, architect, and/ or design office

5. Space limitations

6. Maintainability/ reliability

7. Central plant versus distributed systems

8. Simplicity and controllability

stood, the designer cannot provide an adequate HVAC system. Most

often, different parts of the process have different temperature, humidity, pressure, and cleanliness requirements; the most extreme of

these can penalize the entire HVAC system.

2. Energy conservation. This is usually a code requirement and

not optional. State and local building codes almost invariably include

requirements constraining the use of new, nonrenewable energy. Nonrenewable refers primarily to fossil-fuel sources. Renewable sources

include solar power, wind, water, geothermal, waste processing, heat

reclaim, and the like. The strictest codes prohibit any form of reheat

(except from reclaimed or renewable sources) unless humidity control

is essential. This restriction eliminates such popular systems as terminal reheat, two-deck multizone, multizone, and constant volume

dual-duct systems, although the two-fan dual-duct system is still possible and the three-duct multizone system is acceptable (see Chap. 11).

Most HVAC systems for proc


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