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Date:   Thu, 10 Jun 2010 02:30:21 -0400
Reply-To:   David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:   Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:   David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:   Re: What is camping anyway?
Comments:   To: mcneely4@COX.NET
In-Reply-To:   <20100609142436.M11WC.680483.imail@eastrmwml43>
Content-Type:   text/plain; charset="us-ascii"; format=flowed

At 02:24 PM 6/9/2010, Dave Mcneely wrote: > It also uses a miniscule amount of fossil fuel compared to that > used to generate the electricity that drives the air conditioner.

Are you sure of your numbers, Dave? Modern window A/C units transfer approximately ten BTU/hr for every watt they consume, and whole-house units run closer to sixteen. A nice number but it's apples divided by oranges; in consistent units it means that a 5,000 BTU/hr A/C will consume about 1700 BTU/hr, while a 5,000 BTU/hr vented furnace will consume about 7,500 BTU/hr at 80% efficiency. Assuming 30% power-plant efficiency with no co-generation to help things out, the A/C will consume about 5700 BTU/hr in fuel, which is ~30% better than the furnace.

Yours, David


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