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Can anyone comment on these numbers?

Last Post 06 Jan 2009 09:16 PM by geodean. 23 Replies.

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RayTy

New Member

Posts:4

06 Jan 2009 05:20 PM
I was thinking about the grout that goes into the vertical holes that your loops are placed. When using enhanced grouts you can reduce hole depth and the number of holes. But if just a regular 20% solids is used in a system designed for enhanced grouts you will run into some serious efficiency issues. Ray

geoSteve

New Member

Posts:7

06 Jan 2009 08:29 PM
If the heat load is 64053 BTU/hr wouldn't this require only a 5-1/2 ton unit (12,000Btuh per ton) -vs- the 8 tons (two 4 ton)? It seems like you have plenty of heat pump capacity. That would give you about 140' bore depth per ton of required heating. If all 8 tons were needed the bore field does seem undersized. -=Steve=-

engineer

Veteran Member

Posts:2749

06 Jan 2009 08:37 PM
Refer to ACCA Manual S - designer must incorporate specific parameters of each individual installation - model tonnages are nominal, not actual for every condition, and low loop temperatures significantly reduce actual heat output to well below nominal ratings.

Curt Kinder <br><br> The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>

Palace Geothermal User is Offline

Veteran Member

Posts:1609

06 Jan 2009 09:16 PM
Posted By geoSteve on 01/06/2009 8:29 PM If the heat load is 64053 BTU/hr wouldn't this require only a 5-1/2 ton unit (12,000Btuh per ton) -vs- the 8 tons (two 4 ton)? It seems like you have plenty of heat pump capacity. That would give you about 140' bore depth per ton of required heating. If all 8 tons were needed the bore field does seem undersized. -=Steve=- A 5 ton heat pump with EWT of 30° will give you about 48,000 Btuh not 60,000. This is a mistake easily made by new comers to the geo business.

Dewayne Dean <br>www.PalaceGeothermal.com<br>Why settle for 90% when you can have 400%<br>We heat and cool with dirt!<br>visit- http://welserver.com/WEL0114/- to see my system