Page 9 of 40 FirstFirst ... 234567891011121314151619 ... LastLast
Results 105 to 117 of 513
  1. #105
    Join Date
    Aug 2007
    Location
    Atlanta, Ga
    Posts
    213
    IF those are 5 PAV's...the clothes would get sucked off your back while walking down the hallway...

  2. #106
    Join Date
    May 2007
    Location
    Naples, Fl
    Posts
    889

    http://www.natresnet.org/conference/2006/presentations/Garrett_House_is_a_System.pdf

    The House Is A System
    •Research at the Advanced Energy Corporation showed that 40%of the air exhausted by a PAV is conditioned inside air!

    The House Is A System
    •Convection loops move only 20% of the heat from the roof deck to the attic floor!
    •Radiant heat transfer is responsible for 80%+ of the heat transfer.
    •So, you could create Hurricane Katrina in your attic and only affect 20% of the heat transfer.

    The House Is A System The House Is A System
    •Lessons:
    3.“Improve”attic ventilation and run the risk of making the house more humid, more likely to grow mold, cause the electric bills to go up and possibly cause a fire or CO poisoning!

  3. #107
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,087
    If "The House Is A System" was more widely understood, we'd be well on our way to seeing not only greater energy savings, but higher comfort level satisfaction within our homes. We've been trained to seek active (read: energy consuming) solutions for problems caused by passive sources that have been inadequately considered. Concurrently we'll always need some level of mechanical climate control due to the design of most homes and the various climates we all live in. It just makes sense to place focus on the dwelling structure itself to do more of what it is supposed to do...give us shelter. Shelter not only from rain and sun, heat and cold, but the vagaries of climate that we all must live with.

  4. #108
    Join Date
    May 2007
    Location
    Naples, Fl
    Posts
    889
    Quote Originally Posted by shophound View Post
    If "The House Is A System" was more widely understood, we'd be well on our way to seeing not only greater energy savings, but higher comfort level satisfaction within our homes. We've been trained to seek active (read: energy consuming) solutions for problems caused by passive sources that have been inadequately considered. Concurrently we'll always need some level of mechanical climate control due to the design of most homes and the various climates we all live in. It just makes sense to place focus on the dwelling structure itself to do more of what it is supposed to do...give us shelter. Shelter not only from rain and sun, heat and cold, but the vagaries of climate that we all must live with.
    I have personnaly invited and paid for GCs to attend building envelop seminars. Of the ones that I have invited very few have accepted.

  5. #109
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    I passed by a house last week that had 8 PAVs visible from where I was. I didn't have time to turn around to go take a picture, but I'll try to remember to get one soon.
    It was a large 6000+ sq ft home.
    They were large PAVs too, probably rated for 1200+ CFM each...

    Quote Originally Posted by adrianf View Post
    The House Is A System
    Amen to that!
    If more government is the answer, then it's a really stupid question.

  6. #110
    Join Date
    Feb 2008
    Location
    Tennessee
    Posts
    91
    Quote Originally Posted by captube View Post
    Saw this driving by.
    If these are PAVs as they appear from the distace i'd like to be there when they fire them off.
    looks like someone will be greasing the meter

    I wonder how loud they are. I bet you can heard them from the street!

  7. #111
    Join Date
    Mar 2005
    Location
    5,000 ft
    Posts
    2,182

  8. #112
    Join Date
    Aug 2007
    Location
    Dallas, TX
    Posts
    43
    Thanks all for the excellent information and discussion

  9. #113
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    2,997
    I think it would be a wonderful thing if more people would understand the
    house as a system.
    One hvac owner I deal with has an ongoing argument with me about pav's.
    Until I 'prove' to him that they don't work he will keep installing them.
    Unfortunately..any 'proof' is by quote college educated idiots' therefore
    not to be believed.
    I avoid the topic as much as possible with folks with that mindset, they will
    never chabge their minds.

    good discussion folks. Long..but good!
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  10. #114
    Join Date
    May 2007
    Location
    Naples, Fl
    Posts
    889
    Two quick qualifing questions.

    Is the earth flat or round?

    Is smoking 2 packs of unfiltered cigarettes a day unhealthy?

    But for the record the college educated idiots can be just as dense. My example: Measured air flow through a 5 ton system was 1260 in and 1260 out the recommendation was to clean the coil. The degreed individual didn't think there was anything wrong because you were getting out of the unit what went in

    "In my experience, logic did not convince anybody at any point of time. As I read in a book the other day, only when the spoken word appeals to the other person’s self-interest, will or thought process, will logic be of any use. Logic primarily is to be used for rational beings, or inanimate objects, say with computers. Logic works perfectly in such a system because they are devoid of their own thought process and neither do they possess a sense of individuality and hence self-interest. Human beings are primarily emotional creatures. In an emotional atmosphere, there is no place for logic." Kiran

  11. #115
    Join Date
    Mar 2008
    Location
    Long Beach, CA
    Posts
    3,147
    Quote Originally Posted by energy_rater_La View Post
    One hvac owner I deal with has an ongoing argument with me about pav's.
    Until I 'prove' to him that they don't work he will keep installing them.


    good discussion folks. Long..but good!
    Hasn’t it been determined here that not all PAVs are bad…only the ones used with inadequate soffet and gable vents? In less than ideal situations, reducing motor rpm to 200 – 300cfm would make for a perfectly operating PAV. Low power with low cfms. Disconnecting a PAV should never be the first choice, it’s illogical.

    Logic keep us out of trouble, emotions get us into it. Look at the animal kingdom, they’re 90% logic and do very well.

    Brian

  12. #116
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by Brian GC View Post
    Hasn’t it been determined here that not all PAVs are bad…only the ones used with inadequate soffet and gable vents? In less than ideal situations, reducing motor rpm to 200 – 300cfm would make for a perfectly operating PAV. Low power with low cfms. Disconnecting a PAV should never be the first choice, it’s illogical.

    Logic keep us out of trouble, emotions get us into it. Look at the animal kingdom, they’re 90% logic and do very well.

    Brian
    I disconnect them every chance I get, but I have the training and test instruments demonstrate and quantify the negative impact they have on a particular house.

    At least in my area, the cost to fix the average existing home in my area, so that a PAV doesn't negatively impact the building envelope, would be far higher than any alleged potential savings/benefit from having it running.
    It would not be economically feasible, if even physically possible, to seal many of the homes I see every day to a level that would prevent a PAV from causing unintended negative consequences.

    Then there is the issue that virtually all of the homes in my area with gas furnaces and water heaters draw their combustion air from a ventilated attic, most of the time the appliance is physically located in the attic.
    You can bet your a** I'm disconnecting any PAVs I find in those homes.

    If you are building a new house, I'm a big fan of moving the the insulation to the roof line, and sealing the attic. It makes one hell of a lot more sense than having to deal with super heated air in an unconditioned attic.
    Ventilated unconditioned attics in cooling dominated climates, with the air handling equipment and ductwork in the attic, are a pretty dumb idea, but it has been the norm for decades.
    If more government is the answer, then it's a really stupid question.

  13. #117
    Join Date
    Mar 2008
    Location
    Long Beach, CA
    Posts
    3,147
    Quote Originally Posted by mark beiser View Post
    I disconnect them every chance I get, but I have the training and test instruments demonstrate and quantify the negative impact they have on a particular house.

    At least in my area, the cost to fix the average existing home in my area, so that a PAV doesn't negatively impact the building envelope, would be far higher than any alleged potential savings/benefit from having it running.
    Though my post was quoted you did not respond to it.

    I'll pose the question again. Isn't reducing the PAV motor speed better in most cases than disconnecting it?

    Brian

Page 9 of 40 FirstFirst ... 234567891011121314151619 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event