Hello Joe,

no it is not size that matters, even tiny propeller would be too much.

Building is protected by National Board of Antiquities, and roof is fifth facade of building, so I cannot attach single screw to any surface, no matter how small propeller it would be.
I think this is better view to my point of view.



So only solution is use distance cold -system.
Here is Google translator version öbaut it.


Poi this moonshine is so refreshing.......

Hello Joe,

There is basically three individual layer on house technology to handle indoor condition. Ventilation, heating and cooling.
I think that propeller on roof, you meant ventilation layer...

Well anyhow that layer is very well covered here, especially on older building...
Old time architect did not have high tech gadgets (like electricity motor) so they did need to use ventilation based on gravitation. You know, warm air goes up.
So old times, those fellows did draw very large channels for air inside of building.

These has been modernized during time of course and it is very easy to do, simply because need for space will drop very dramatically if you start move air with motor, instead of gravity.
All mechanical (propellers of any size) needed to perform this, can be hidden inside building and there is already lot holes on outer core, if you take look at that picture, there is air vent on right hand side, on middle.
So this is no problem at all..


Cooling is performed very usually with local application.
Quite much standard indoor units and huge outdoor unit (with line of propellers)..

On some cases, this is simply not possible, so only solution is use use district cold system. It is very rear here, it requires own tubes all directions, so it means BIG renovation inside building, with own control room where cold is distributed and also counted for billing, etc.....
It is also quite expensive, it is lot more pricey that district heat.

But I guess when do not have change, price is always right.


Then we have heating.
Most popular is distributed heating. It all started here on 1950's by utilization waste heat of power plants.
Now öbaut 50% of all houses (one family houses counted) and 90% on city areas are heated with this way.

About this geothermal energy....
I really think that you have it exact same amount as we have, which is quite near 0 joule. Well, there might be some on Hawaii... Poi, this is something I need to study out..

There is geothermal energy on Iceland, on praxis it means borehole to ground and if you through water there, it will come back to surface something like +451 'F.

"Geothermal" -system sold here are pure heat pumps, quite much like big refrigerator.
Concept something like hundred to two meters (300 - 700 feet) deep borehole on bedrock.
Instead of throwing cold water there (this is where reality strikes) they put some tubes there carrying ammonium or something.
What they do on praxis is trying to freeze bedrock, and because they loose, they have some energy on their hands...

Quite much if you through -20 F' liquid to bedrock which temperature is -10 'F you will not manage freeze bedrock, instead your liquid will come back with +10 'F (-20 'F -> -10 'F) warmer.
If you going to put same liquid back with original temperature, you need to waste that +10 'F to somewhere, like house...

This is actually quite nice system, those who have it has told me that they will receive 3kW heat with 1kW of electricity.
On Sweden they do use really lot this method and they have some very nice statistics about what is most reliable compressor on long run, etc, etc...

But still, this has absolutely nothing to do with geothermal energy, that is actually caused by nuclear fission on core of earth.
Well, never the less, this refrigerator system is sold as geothermal stuff here.. Quite odd to say...
Maybe I should pay some wasteland and sold it as diamond mine..


I think there is some law coming that after 2012 build one family houses need to be able to create all their heating needed.
So in praxis there is going to be lot of these zero energy houses, that are quite much lite thermos bottle... And lot "geothermal" energy.

Here is one nice detail, it is called heat transformer.
Concept is ultra simple and mechanical, but it will move 70 -80 % of heat and moisture from exit waste air to incoming fresh air.

It has this rotating disk (3D-sieve), very much like heat sink on computer, except structured as disk and rotating.
When you shoot air from house (not sure but let's play it is upper half) metal 3D-sieve get warm and moist. Now that part is revolved to downside that works as channel for incoming air.
Coming air is of course cold and dry, so it will catch heat and moist from disk, a.k.a changing it cold and dry, which is then turned to upper side to get warmed and moisturised.

Finally got that little stinker working. It turns out the CMOS battery was bad which gave you a series of errors on boot. Bought a new one. Cost $4.00. Then I kept getting a motherboard error. Looked that error up and most of the posts were unhelpful, but I did find one which said the error could be caused by a defective or dead lithium battery. The solution it turns out is to just remove the battery pack and run it on AC. ( I bet those battery packs are expensive, if you can actually find one.) Voila ! The error goes away and I could load a operating system on it. I tried Linux mint, but there was a problem with the bios being too old and the videodriver made the screen really goofy. I loaded XP and that worked, but it is pretty slow, which I expected. This system does not have an ethernet port on it, but it came with a 3Com card with an ethernet connection. But the card is so old that none of the drivers I could find seemed to be XP compatible even though the literature said they were. Bottom line is I have not connected it to the internet yet. I do have a USB wireless hookup that I will try next. I need to borrow that from another system. It does have a built in telephone jack for connection to a modem. Big whoop . So sometime this weekend I will get it connected to the internet so I can download all of the updates it needs. An interesting project so far.

Cheers

From personal experience i have found that the best way to remove a big snapper is to use a tree branch big enough to support a 25 or 30 pound turtle and stick it in it's face. The turtle will bite it and now you can safely move it wherever you need to.

Your chicks would have been toast. as a kid i had pet snappers and anything that enters their striking range is toast...

We have a number of different species of turtles here, original fauna. They are active during the summer and they generally bury themselves in the mud in the autumn and hibernate through the winter. The snapping turtle is a particularly ornery critter. They are fast for a turtle and will grow very large. I have heard of specimens about 2 ft (2/3 M) in width, but I have never seen one that big.

http://en.wikipedia.org/wiki/Common_Snapping_Turtle

I do not know why anyone would ever want one of these things for a pet.

Cheers