[Greenbuilding] Greenbuilding Digest, Vol 16, Issue 41

[Holly M Ferguson]

i have tried to get off this list repeatedly over the years..ive 
unsubscribed several times..any hints on how to do this more effectively?
----- Original Message ----- 
From: "Mike Kelly" <mikekelly29 at gmail.com>
To: <greenbuilding at listserv.repp.org>
Sent: Wednesday, October 24, 2007 8:59 AM
Subject: Re: [Greenbuilding] Greenbuilding Digest, Vol 16, Issue 41


> We bought a house built in 1970 that was not energy efficient to begin 
> with.
> The previous owners installed recessed can lighting all over the house,
> which pulled the insulation back making a poorly insulated attic even 
> worse.
> I was surprised when I ran a manual J that I could almost double the 
> square
> footage and still reduce the load. The two big changes were the SIP roof 
> and
> the new windows throughout. The final part will be a blower door test to
> seal remaining leaks.
>
> The whole point was to make an inefficient house more efficient.
>
> Does anyone have any references to back up the inefficiencies of the high
> velocity system?
>
>
>>
>>
>> Date: Tue, 23 Oct 2007 10:27:25 -0400
>> From: candtcampbell at juno.com
>> Subject: [Greenbuilding] high velocity air conditioning
>> To: greenbuilding at listserv.repp.org
>> Message-ID: <20071023.103404.-437419.0.candtcampbell at juno.com>
>> Content-Type: text/plain; charset=us-ascii
>>
>> Mike,
>>
>> This is a bizarre question. If you are adding a story but not changing
>> the compressor which was not only originally oversized, but will be
>> oversized in the new house, to me that means that the existing compressor
>> was *hugely* oversized for the original house, which in turn means that
>> humidity was not controlled originally. What kind of a hack did the HVAC?
>> If I insisted on reusing an oversized compressor, I would *lower* the
>> insulation levels on the addition or add windows to match the
>> compressor's output.
>>
>> As for ERV's, (not HRV's) they do remove some humidity from the fresh air
>> stream, but not so much that I would include it in the calculations.
>>
>> Tim
>>
>> I am adding a second story to an existing house. The second story will be
>> constructed with SIPS and the first story will be sealed as well as I
>> can.
>> It is in the hot and humid gulf coast region. Plumbing, electrical and
>> HVAC
>> will be run through trusses between floors. One option that I am looking
>> at
>> is a high velocity HVAC system to reduce the depth of the trusses. Part
>> of
>> the system I am looking at is a Venmar heat exchanger to bring in fresh
>> air.
>> The air exchanger supposedly regulates humidity. Can anyone explain how
>> this
>> works? Will an air exchanger remove humidity sufficiently in this
>> climate?
>>
>> The existing condensor will be reused but will be slightly oversized. My
>> concern is that in tightening the envolope, the air conditioner will run
>> less than necessary to remove the humidity. This is not a problem if the
>> air
>> exchanger controls the humidity.
>>
>>
>>
>> ------------------------------
>>
>>
>>
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