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Is this really a <I>heat pump</I> cooling system, or a (pumped) direct water cooling system?<BR>
<BR>
-----Original Message-----<BR>
<B>From</B>: RT <<A HREF="mailto:RT%20%3carchilogic@yahoo.ca%3e">archilogic@yahoo.ca</A>><BR>
<B>Reply-to</B>: archilogic@chaffyahoo.ca, Green Building <greenbuilding@lists.bioenergylists.org><BR>
<B>To</B>: Green Building <<A HREF="mailto:Green%20Building%20%3cgreenbuilding@lists.bioenergylists.org%3e">greenbuilding@lists.bioenergylists.org</A>><BR>
<B>Subject</B>: Re: [Greenbuilding] water-source heat pump formula<BR>
<B>Date</B>: Tue, 06 Aug 2013 18:37:59 -0400<BR>
<BR>
<PRE>
On Mon, 05 Aug 2013 00:48:47 -0400, Carol Venolia <<A HREF="mailto:cvenolia@sonic.net">cvenolia@sonic.net</A>>
wrote:
<FONT COLOR="#737373">> friend wants to use the pond as a component of a water-source heat-pump </FONT>
<FONT COLOR="#737373">> cooling system. He’s looking for a formula (or several?) he can use to </FONT>
<FONT COLOR="#737373">> calculate the length of collector/coolant tubing he should install in </FONT>
<FONT COLOR="#737373">> the pond to provide a given amount of air cooling</FONT>
Dear Domestic Nature Goddess;
I don't know nuttin' about nuttin' about WSHP gizmology but if I did want
to find out, the first place that I'd go a-lookin' is ASHRAE.
And if I were too lazy to to try and figure out how to use the reams of
formulae that I'm sure one of the ASHRAE handbooks would provide, I think
that I'd contact one of the heat pump suppliers and/or manufacturers and
let them do the arithmetic for me.
So on the "preliminary lazy man's search" I plugged "ASHRAE water-source
heat pumps" into Google and one of the first hits was:
<A HREF="http://www.mcquay.com/mcquaybiz/literature/lit_systems/AppGuide/AG_31">http://www.mcquay.com/mcquaybiz/literature/lit_systems/AppGuide/AG_31</A>-
008_Geothermal_021607b.pdf
in which the section on "Surface Water (Loop) Design" starting on page 31
provides:
================= Copied material =================
" ... Pond depths are usually 10 to 12 feet minimum."
" ...typical operating range for surface water systems is 35°F to 87°F."
" ...Piping systems are generally made up of 300 to 350 ft coils of ¾ in.
HDPE pipe.
Each coil will reject about 1 ton of heat to the water."
================ end of copied material ===================
Looks to me like the above-cited PDF should be enough to get your friend
started.
</PRE>
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