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Country Discussion Topics
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How many BTUs?
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Tom A (Bkeepr)    Posted 01-17-2003 at 07:33:13       [Reply]  [No Email]
I notice that the byre of our old bank barn is 10-20 degrees warmer than the surrounding air, all winter long. The only heat sources in there are 13 goats, a pair of sheep, a mule and a donkey.

The doors are open, but the fact that it is 2/3ds below ground level must provide some insulation.

So, anybody got any idea how many BTUs these critters put out? Must be a bunch...just wonderin'


Ray    Posted 01-17-2003 at 15:02:46       [Reply]  [Send Email]
You can increase the btu output of your livestock by increasing the protein in their diets, you can put a heat exchanger in the manure pile and circulate water through the barn and heat it that way as well.

Greg S    Posted 01-17-2003 at 10:47:51       [Reply]  [No Email]
Sheep/goats-3 btu/hr per lb of weight
mule/donkey- 2000 btu/hr per 1000 lb of weight

heat losses at 50*F lower temps will increase heat loss about 25%

RayP(MI)    Posted 01-17-2003 at 16:10:31       [Reply]  [No Email]
How about 86 rabbits of varying sizes?

Greg S    Posted 01-21-2003 at 05:51:13       [Reply]  [No Email]
About 40 btu/hr per animal

Scott Hansen    Posted 01-17-2003 at 10:51:35       [Reply]  [Send Email]
How in the heck do you know that???

Greg S    Posted 01-17-2003 at 12:52:51       [Reply]  [No Email]
Was a consulting mechanical engineer in a previous life, designing HVAC and plumbing systems for all types of buildings. ASHRAE has a book that has charts and tables for heat generation factors for about anything you can think of, did an HVAC system once for a outfit that raised mice for research labs (amazing how much heat 50,000 little white bodies put out) and a monkey house at Univ. of Colo. med school. Had to come up with some real innovative grilles- the monkeys would pack a standard grille full of food and monkey shutt.

Tom A    Posted 01-18-2003 at 05:21:01       [Reply]  [Send Email]
Thanks Greg S, good info. Although I've never worked in it, my degree was in Mechanical Systems engineering and I vaguely remembered there were resources like that. Appreciate it.


Salmoneye    Posted 01-17-2003 at 08:03:44       [Reply]  [No Email]
Is that side below the frost level in your area?

If so I'd say that you are getting ground heat which if I remember correctly is around 54 degrees constantly...

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