[Greenbuilding] water-source heat pump formula

Peter Kidd peterkidd at shaw.ca
Tue Aug 6 18:10:42 CDT 2013


Is this really a heat pump cooling system, or a (pumped) direct water
cooling system?

-----Original Message-----
From: RT <archilogic at yahoo.ca>
Reply-to: archilogic at chaffyahoo.ca, Green Building
<greenbuilding at lists.bioenergylists.org>
To: Green Building <greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] water-source heat pump formula
Date: Tue, 06 Aug 2013 18:37:59 -0400


On Mon, 05 Aug 2013 00:48:47 -0400, Carol Venolia <cvenolia at sonic.net>  
wrote:

> friend wants to use the pond as a component of a water-source heat-pump  
> cooling system. He’s looking for a formula (or several?) he can use to  
> calculate the length of collector/coolant tubing he should install in  
> the pond to provide a given amount of air cooling


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:

http://www.mcquay.com/mcquaybiz/literature/lit_systems/AppGuide/AG_31-  
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.




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