Passive Ventilation System

http://www.greenspec.co.uk/html/checklist/U-Ventilation.html

No power input. Used to be called natural ventilation in the olden days. In some places it's making a come-back because of the green lobby.

A hole..... or several holes joined together with stuff.

Or a hole with a fan that's broken!

Joking aside...there are often naturally occuring pressure differentials which can be utilised to provide passive ventilation.

Wind blowing across a conventional chimney can draw air out. Buildigs often have a natural low pressure and high pressure side depending on prevailing wind and layout of the surrounding buildings. Try opening the back and front doors at the same time , you may well get a good through breeze.

Active ventilation can be dangerous..

How many people have extractors fans and central heating boilers in their kitchen?

The extractor fan can end up pulling all the flue gas through the room turning it effectively into the chimney. This actually saved me knocking a hole in the kitchen wall...I just fitted carbon filters and recirculated the air...

(Before anyone starts shooting..please check on the Building Research Establishment website if you don't believe this.)

<burp>

A hole in the end of my box keeps my toes from thawing out in the winter <Phrrrrp>. Still, could be worse places. You try getting a WiFi spot outside Pitsea railway station <cough> at 4 in the morning.

There is a nice way to do it by having windows on the sides of you building, even at floor level, and chimneys or windows at the top of it. It is usually seen on warehouses. I mean, if you are talking about air contioning.

This may be one alternative:

Where did you find this I would like four for my chimney's?

The most interesting is in Vancouver Barracks, in Washington. Each building had 2 huge black pipes that billow at the top. They look like very odd chimneys. As they heat up, they pull cool air from under the buildings through the 2 or three stories. Intersting and very effective AC for the 1800's and still effective today.

Yeh I don't think the 'Chimneys Operating Stsystem' has been upgraded since 1800.

Bill Gates please note, they still work unlike your stuff.

lol Del !! I thought I was the only one giving gates hell....

I have a question. Does a Passive Ventilation System include using heat generated by the earth by digging a hole deep enough to access geothermal heat from underground ? I heard something like this in a "green" forum.

Yip, ye sure as hell do work up some kindofa sweat diggin' them darned holes! I'm off for a darned good bellyfull o beer y'all.

Is that your Britney Spears impression?

Was Britney around during the Gold Rush??? It was the concept of heat generated while digging under ground that got my facile imagination going.

I'm still practicing this Speed Reading thing.

I was just poking fun at what I thought was a southern redneck imitation. If you've ever heard her being interviewed, you would see what I mean. I missed the gold rush thing completely.

Might have been a bit of that too :)

With a hole in the ground there would also need to be an inlet for the air at the bottom of the hole. (something that would allow the air to circulate.)

Power plants often use a passive ventilation system to cool their water....The hour glass looking concrete stacks with steam bellowing out the top. the hot water from the plant free falls near the bottom of the stack and air flows through it. As the temperature of the air increases greater then ambient, it begins to rise up toward the top of the stack thus pulling in more air from the bottom. As the temperature differential between ambient and heated air increases, the faster the air will rise/circulate.

the same would be true for passive liquid system. A circulative loop is required for fluids.

An example of this would be the passive system utilized on the Alaska pipline support posts. A closed loop passive system with a heat exchanger and ammonia as the liquid keeps the ground surrounding the post frozen year round. This keeps them from sinking into the ground and causing damage to the pipline.

Bill Gates brough no harm to You and Me and CR4