[Greenbuilding] DIY Cooler

Gennaro Brooks-Church - Eco Brooklyn info at ecobrooklyn.com
Tue Jul 9 15:07:11 MDT 2013


Has anyone built their own HVAC heat pumps? I saw this today and thought it
would be cool.
http://www.greendroplet.com/index.php/goodman-capf3030d6-vertical-evaporator-coil-24-5w-x-22h-x-21d-2-5-ton.html

You could hook it up to a thermal panel for heating. or an earth tube for
cooling?

Gennaro Brooks-Church
Director, Eco Brooklyn Inc.
Cell: 1 347 244 3016 USA
www.EcoBrooklyn.com
22 2nd St; Brooklyn, NY 11231


On Tue, Jul 9, 2013 at 4:55 PM, Gennaro Brooks-Church - Eco Brooklyn <
info at ecobrooklyn.com> wrote:

> Combing ERV/HRV and cooling is a huge question. Does anyone have
> experience with a new system where you can plan for the ductwork? In that
> can could you install large ducts and run the ERV and some sort of cooler
> in the same ducts? In that case I think it may be better to find some
> inline cooling system instead of jerryrigging a minisplit to work inline?
>
> Gennaro Brooks-Church
> Director, Eco Brooklyn Inc.
> Cell: 1 347 244 3016 USA
> www.EcoBrooklyn.com
> 22 2nd St; Brooklyn, NY 11231
>
>
> On Mon, Jul 8, 2013 at 2:03 PM, Lynelle Hamilton <lynelle at lahamilton.com>wrote:
>
>> Hi John
>>
>> Thank you so much for this.  I'd never planned to install AC, so
>> admittedly paid no attention to ducting.  The first two years here were
>> fine, but the last two have been oppressively humid.
>>
>> I'll look at the Fujitsu.
>>
>> My HVAC guy is recommending two systems, as the house is about 2000 sq
>> ft, but it's the great room that's the problem....only 900 sq ft., so the
>> model you suggest may just do the trick.
>>
>> Lynelle
>>
>> On 08/07/2013 10:59 AM, John Straube wrote:
>>
>>> It takes about 400 cubic feet per minute of airflow to deliver a ton (12
>>> 000 Btu/hr 3.5 kW) of cooling in normal systems.  You can reduce this to
>>> maybe 350 but at this flow rate you risk frost building up on the coldest
>>> part of the coil, which spreads until the coil is a block of ice.
>>> It is difficult to find commodity AC systems under 1.5 tons, so minimum
>>> ducting is usually for 600 cfm, and 2 tons with 800 cfm is far more common.
>>>  600 cfm can also deliver about 30 kBtu/hr of heating BTW, so a nice normal
>>> minimum.
>>> Given than an HRV is unlikely to be designed for much more than 100 cfm,
>>> the short answer to your question is "NO, not with normal systems"
>>> Minisplits are available that are smaller and have variable output that
>>> drops to only 3000 or 4000 Btu/hr, but most are not compatible with ducts.
>>>  Even the ones that are available for ducts are assuming ducts that are
>>> larger than normal and thus have less pressure drop than normal systems.
>>> I have a very similar situation that you do.  I dont need much cooling,
>>> if any at all, but the humidity is a huge issue. I have a dehumidifier
>>> running in the part of my basement that is not insulated under the slab
>>> (built 1960) and that helps but does not solve the above grade part of the
>>> house.
>>>
>>> For your house , I think it really is best to find a central spot near
>>> the open area where you can install a ductless mini-split.  I am installing
>>> a Fujitsu ASU12RLS2 system based on experience with several projects and
>>> hundreds of other home installation.  This unit can run down to about 3000
>>> Btu/hr and should therefore provide little cooling and a lot of
>>> dehumidification.  Will see.  Other houses, not as efficient as mine, have
>>> used this and very similar units, and found it worked very well.  It will
>>> cool your house however unlike a dehumidifier, so you will have to "live
>>> with" temperatures that are a few degrees cooler than now if you want the
>>> RH down to 50% (where you should be targeting).
>>>
>>> On 2013-07-08, at 10:47 AM, Lynelle Hamilton <lynelle at kos.net> wrote:
>>>
>>>  Can I run AC through the HRV ducting I already have?  I don't like the
>>>> look or noise of mini splits, so am looking for any other option.  My HVAC
>>>> guy says that an AC unit will freeze up, as the HRV ducts are too small.  I
>>>> did have one run through similar HRV ducts in my old home without problem,
>>>> however.
>>>>
>>>> Does anyone have any experience with such a configuration?  I've
>>>> googled, but came up empty.
>>>>
>>>> Should add that I don't need much cooling....it's the humidity that's
>>>> the problem.  House is well insulated and sealed. However, I'm on the water
>>>> so humidity gets to 80% in the house unless I run a dehumidifier. Running
>>>> it raises the heat in the house 8F and doubles my hydro bill--hardly green.
>>>>
>>>> Many thanks!
>>>>
>>>> Lynelle
>>>> --
>>>> */"Life is an experience and an opportunity. The meaning comes from
>>>> what we decide to do with the opportunity that is given to us."--Bernie
>>>> Siegel/*
>>>>
>>>> ______________________________**_________________
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>>>>
>>> John Straube
>>> www.JohnStraube.com
>>>
>>>
>>>
>>
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