燃烧设备区（CAZ）压力太低
Robert Post S.E. Pennsylvania Zone 4a|Posted in机械on
On an energy retrofit project during the test out I learned that under worst case conditions, without the air handler on, the unfinished basement combustion appliance zone (CAZ) pressure was at the threshold of the BPI guidelines of -5 pascals. There is an atmospherically vented furnace and HWH down there.
当空气处理程序打开并关闭地下室门时，压力为-7 PA。我读这件事是地下室漏气的漏气，其中许多是托运托梁的托架。房主将将其密封，但无法完美地密封。我怀疑，即使在裸露的收益密封后，最严重的情况CAZ压力也不会通过BPI标准。该客户将在几年内切换到地热，并获得密封的燃烧或电动HWH。
I have made temporary provisions to accommodate the combustion appliances, but what would be the best way to remedy this?
他在设备附近有一个料斗窗口，需要更换：是否有一个可以实现这一目标的玻璃砖瓷砖通风孔：只有在压力下降到设定点以下时才能打开？
提前致谢！
Rob Post
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答复
测量CAZ压力只是工商业的一部分t. Testing spillage, draft, and CO are also required. Was this done, and what were the results? And, what specifically was done to "accommodate the combustion appliances"?
All done. Spillage occurred when the CAZ went to -7pa, but not before when at -4.7. The units run clean and are as efficient as can be, given the technology.
I need a solution to offer "make up air". In the past, a passive fresh air vent would be installed, but I'm looking for a more controlled approach. Any suggestions?
In conditions where CAZ depressurization is severe, we've been installing a ducted intake with barometric damper. This sort of damper is designed for oil burning furnaces and can be obtained at your HVAC supply house. In your case, the depressurization is probably minor enough to get away with a 6" damper or even smaller. Just extend the duct through the hopper window opening, elbow down and feed to another elbow or "T" with closure on the bottom. Install the damper inside and use a grill on the outside to prevent animal entry. Adjust the weight to the greatest degree of sensitivity, (probably .02" WG which is equal to 5pa). This will allow intake air without creating a gaping hole in the house. Tony Olaivar - HERS Rater, BPI Professional - Lanz Heating and Cooling.
Tony-
很好的主意。我曾想到了这一点，但是关注如何将其与窗户甚至新的玻璃窗户窗口集成在一起。玻璃块带有一个4英寸的管道瓷砖，用于干衣机。此外，我是否必须向后安装阻尼器，因为它需要从外部绘制而不是锅炉上的地下室绘制？
校正：0.02“厕所等于5PA
You're mixing your metaphors (or your fluids).
我不确定是否可以向后安装此阻尼器。无论如何，答案是否定的，门将双向摆动。只需确保不要在其干预的地方种植任何钣金螺钉即可。更好的是，使用流行铆钉。Lanz Inc的Tony
TONY-
Thanks for your help.
.02" ofwater gauge也等于5PA。脚趾脚，脚趾脚，脚趾等。
罗伯特，
You're correct that you'll have to install it in reverse from the typical installation in a tee on the furnace stack because the air must be drawn out of it rather than into it, but those units are not reversible. You'll have to use an inline barometric damper which can be installed in either orientation.
Inches of water column ("WC) or inches of mercury ("HG) and Pa (N/M²) are absolute pressure units. Water gauge (or any gauge pressure) is the difference between system pressure and ambient air pressure.
Robert- thanks for the clarification and distinction between units.
Someone else recommended an Eqalizair (http://www.equaliz-air.com/). This unit provides combustion air and make up air to the return through 2 ports with dampers. It does not appear to be adjustable in terms of pressure activation.
有人熟悉这种方法吗？
罗伯特，
我认为最好使用内联可调气压阻尼器组成自己的全体会议。eqalizair系统可能会起作用，但不可调节，不提供打开襟翼所需的压力差的规格（这取决于管道尺寸，类型和长度）。谁创建该网站对该主题没有任何理解。这是我认为我见过的最荒谬和自我矛盾的网站（使用没有意义的类比，并引用一个“专家”，说“它不会让顾客敲门”）。
我听说有许多技术人员和讲师互换使用水表和水柱，无论您是不对的。托尼在说什么对我来说很清楚。
至少在我所在的地区，很难看到在5或7个Pascals或与之接近的任何事物的情况下打开的功能。风将不断吹，除非在夏天平静的时候，而且您不需要阻尼器。也许我过于冒险避开，但是在这种情况下，我不太可能向所有者提出临时解决方案。他们可能会更好地打开料斗窗口。
当目的是防止负压差异超过5 pa时，零PA阻尼器（一个打开的窗口）如何比校准的5 PA阻尼器更可取？
The duct could be run out the window, elbowed down and then elbowed outward and terminated with a tee with two (screened) horizontal openings. This would allow wind to pass through yet allow air to be drawn in when the CAZ pressure drops.
似乎是一个非常聪明且简单的“临时”解决方案。
P.S.所有压力读数都是仪表压力，除了气压压力，这是绝对的。但是，单位PSIA和PSIG注释了技术差异。水表等同于PA差速器（这是鼓风机的措施）。
罗伯特 - 查看现场控件，它们为您的情况制造产品。http://www.fieldcontrols.com/index.php