ground source and hydronic cooling recommendation [RE-wrenches]

[Dean T. Newberry]

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Hi Kurt,
commercial Tbar ceiling panels with cooling piping attached are 
available from Invensys. They use active humidity control. The Kaiser 
headquarters in Oakland is chilled ceiling, and it is a common practice 
in burn wards. Basic rules for radiant flooring are used with heat trac 
transfer plates attached to touch the drywall ceiling.
A 55F degree chilled water loop with transfer plates on 8" centers on 
5/8" drywall should be able to absorb 20 btu/sqft/hour without 
condensing. There are tables on the Invensys CD that lay this out. Note: 
standard Chilled water loop temperatures in commercial buildings is 40F 
this will condense unimaginable amounts of water and cause a mold 
problem when applied to a radiant panel. Humidity is the devil in 
radiant cooling designs. I would stay with AC, Invensys Radiant ceilings 
or Valance convectors from Edwards Engineering in all but the driest 
climates.

Kurt Albershardt wrote:

> --On Saturday, February 07, 2004 6:17 PM -0800 "Dean T. Newberry" 
> <deant at dcn.org> wrote:
>
>>
>> The heat capacity of dry sand is .2 that of water the thermal 
>> conductivity is similar. I strongly recommend using the guidelines of 
>> the RPA and IGSHPA. I talked to a GSHP dealer in Phoenix AZ who 
>> closed down his AC business and bought a Postbox business because the 
>> conductivity and capacity of dry sand made the business model fail.  
>> The GSHP systems in CA that have been tested in 200 foot bores 1 per 
>> ton, run excessive return water temperatures ~120 degF at peak air 
>> conditioning load conditions I cannot recommend using a sand box as a 
>> thermal storage device, and the IGSPHA guidline designs in this 
>> climate zone have serious problems at limit conditions too.  Fine 
>> homebuilding sells advertising, not houses.
>
>
> I should mention that my plan is to pull fresh air through a 100' 
> culvert (3-4' diameter?) buried ~5' underground as a first stage, 
> which will then feed evaporative cooling for the Summer and provide 
> fresh air for the other months.
>
>
>
>
>> The most comfortable systems are the radiant chilled ceiling, radiant 
>> heated floor homes with good radiant and conductive insulation. 
>> Condensation in cooling is always a concern. Use glazing appropriate 
>> for the climate. Use plant shading appropriate for the climate
>>
>> I am using Valance convectors for heating cooling distribution, 
>> evaporative precooled high performance AC systems
>
>
> Any pointers on chilled ceiling setups?  Does one or more of the books 
> I listed cover this or is there another good reference?
>
>
>
>
>
> --thanks
>
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-- 

 
* Cooperative Community Energy* 	*Dean T. Newberry*

430 D Street, Davis CA, 95616
Tel: 530 758-6064
Fax: 530 758-3684
Email: deant at dcn.org
Web:  CCEnergy.com       
      Talbott Solar <http://www.dcn.davis.ca.us/go/deant/>

Contr. Lic. # B-667908

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