Posted by Bret4207 on March 06, 2014 at 09:39:23 from (64.19.90.196):
In Reply to: Solar heating? posted by 55 50 Ron on March 05, 2014 at 09:58:58:
Tom, I was looking at examples like this- http://www.norishouse.com/PAHS/UmbrellaHouse.html
Now, looking at that what I see is an insulated (R20) ground mass, only insulated on top and a little of the sides. What I also see is that the thermal energy is theoretically somehow transferred to the ground mass via warm air convection through the labeled "heat tubes". (This is why I compared to a heat pump type system, I understand you're using natural convection- got it, no argument on the passive part.) The impression I get is that they are, in t e example I linked to anyway, somehow taking that warm air 50 feet down and attempting to warm the soil. And all this is being done through a relatively tiny window of the house.
Where I have a real problem is that if this was to work, then you are putting X BTU's (for lack of a better term) into the ground via natural convection during the day. As soon as the sun goes down or it clouds up significantly then the convection current is going to change and the BTU's start going the other way as cool air starts flowing in and cooling the mass. So I guess my question is, how can it "gain" heat once your losing more BTUs than you're gaining? I can let a rock get nice and hit in the sun and cover it with insulation, by midnight or so it's still going to have lost that heat. Unless the whole of the ground mass was insulated it's going to radiate out.
Please tell me more. I won't say it can't work, but I have a real hard time envisioning it.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
