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What We Have Learned from 20 Years of HVAC System Commissioning 我们从20年的暖通空调系统调试中学到了什么
正如大多数人现在所知,ASHRAE指南0-2005规定,“调试过程是一个以质量为导向的过程,用于实现、验证和记录设施、系统和组件的性能是否符合规定的目标和标准”。在提供这项服务20年后,回顾并确定我们所学到的一些最有益的经验教训是合适的,这些经验教训可以帮助建筑设计师、业主和运营商。多年来,我们发现了许多问题,如回风管缺失、送回风管绝缘缺失、扩散器误用、终端装置误用以及系统影响问题。 虽然这些都不是那么不寻常,但也发现了一些对性能和能耗有重大影响的问题。本文将确定调试过程中发现的问题,这些问题对能源、舒适性有重大影响,最重要的是再次发生。它还将提供问题的解决方案以及由此带来的好处。其中许多问题出现在调试供应商在施工几乎完成之前没有参与的项目上,或者出现在重新调试项目上。在这些案例中发现的问题通常意义深远。 例如:回风机和建筑压力控制不当;VAV增压回风系统使用不当;管道式回风系统设计或安装不当;冷却盘管管道连接不当;VAV系统中控制排气压力的可疑策略;大型校园系统的一次/二次泵送系统中的冷冻水流量控制不足;以及对运维人员的不当培训。引用:ASHRAE Trans。,第118卷第。德克萨斯州圣安东尼奥2号
As most are aware by now ASHRAE Guideline 0 - 2005 states that "the Commissioning Process is a quality-oriented process for achieving, verifying, and documenting that the performance of the facilities, systems, and assemblies meets defined objectives and criteria". After 20 years of providing this service, it is appropriate to look back and identify some of the most beneficial lessons we have learned that can help building designers, owners and operators.Over the years we have found numerous issues such as missing return air ducts, missing supply and return air duct insulation, misapplied diffusers, misapplied terminal units, and system effect issues. While these are not all that unusual, there have been issues found that have a significant impact on performance and energy consumption.This paper will identify issues found during the commissioning process that were energy significant, comfort compromising, and most importantly re-occurring. It will also provide resolutions of the issues and the resulting benefits. Many of these issues were found on projects where the commissioning provider was not engaged until construction was almost complete or on retro-commissioning projects. Issues found in these cases are typically profound. Examples include: improper control of return air fans and building pressure; improper use of VAV plenum return air systems; improper designed or installed ducted return air systems; improper cooling coil piping connections; questionable strategies for controlling discharge air pressure in VAV systems; inadequate control of chilled water flow in primary / secondary pumping systems of large campus systems; and improper training of O&M staff.
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