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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: net.consumers
Subject: Re: 3 zone heating ??
Message-ID: <659@kitty.UUCP>
Date: Sun, 22-Dec-85 12:04:33 EST
Article-I.D.: kitty.659
Posted: Sun Dec 22 12:04:33 1985
Date-Received: Tue, 14-Jan-86 07:55:49 EST
References: <307@rruxe.UUCP>
Organization: Recognition Research Corp., Clarence, NY
Lines: 28

> we have three zone hot water baseboard heat:(separate thermostats)
> 
> 	zone 1	- in the LR, DR, Kitchen, hallway
> 	zone 2	- in the bedrooms
> 	zone 3	- in the finished basement
> 
> we usually have zone 1 on during the day, zone 2 at night, and zone 3
> whenever we are downstairs.(zone 1 and zone 2 are on the same floor)
> 
> is there an easy way to figure out what the incremental costs of having
> a second(or third) zone on when one is already turned on.

	Well, the incremental cost of an additional zone is certainly less
than that of the first zone turned on - which is running the boiler with the
consequential energy "overhead" associated with the boiler operation.
	If I were to hazard a guess (I have a 3-zone gas-fired hot water
system in my house), I would say that 60% of the energy consumed when running
one zone is lost to the boiler and stack, with 40% going into the hot water
circulation system.  Assuming that your zones have approximately equal pipe
length and radiating area, the incremental cost of a second zone in operation
would be 40% of the first zone in operation.

===  Larry Lippman @ Recognition Research Corp., Clarence, New York        ===
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