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Type: Posts; User: garymunson

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  1. I'm not sure increasing duct size would help you...

    I'm not sure increasing duct size would help you since going to a bigger duct will decrease velocity in the duct, but the velocity will still be the same at the register. Only adding more registers...
  2. Roy, revisiting HRUs... I've been doing my...

    Roy, revisiting HRUs... I've been doing my 'unscientific' research with my infrared thermometer and have found that all condensing units I've checked, high, low, and average efficiency units seem to...
  3. Ugh...sounds like a real dilemma. You are...

    Ugh...sounds like a real dilemma. You are probably right about too-small duct size although maybe a better fix would be to add some more final ducts and registers if you can get at the main trunk....
  4. Skip, The ROI comes fast with the HRU. My...

    Skip,
    The ROI comes fast with the HRU. My water heater never comes on most of the year and when the HRU circulates water, my compressor draw drops 2 amps from around 11 to 9. To me this is about a...
  5. Skip... I haven't seen a bypass used with any...

    Skip...
    I haven't seen a bypass used with any residential HRU's. As I mentioned below, the range of temps encountered are so close to normal range anyway, the system is always operating within...
  6. I should couch my statement on solar heat storage...

    I should couch my statement on solar heat storage tanks with the disclaimer that with a very large secondary tank (100 gal. +) you can keep the cold water out of the backup heater but now you need...
  7. I use a SEER 13 system. I find that the...

    I use a SEER 13 system. I find that the compressor discharge temp is consistently around 150-175 degrees. Plenty of heat for the HRU to function. The 2 amp compressor current drop with the HRU...
  8. Any of the hru's will work with a pkg unit. They...

    Any of the hru's will work with a pkg unit. They just tie in at the compressor discharge. Are you in an area where you use enough A/C to get a benefit from an hru? Here in cent F/l our A/C runs 9 mo...
  9. Fre... Here's some sites referring to HRU's...

    Fre...
    Here's some sites referring to HRU's and the effect of sun on condensors.
    http://www.fsec.ucf.edu/en/publications/html/FSEC-PF-302-96/index.htm...
  10. Fre, I've used hrus for decades. All installs...

    Fre,
    I've used hrus for decades. All installs I've seen just use the water heater as the storage unit. My current new house has a 80 water heater with the thermostat set at 110 but the hru is set...
  11. I was just made aware of another mfg site on heat...

    I was just made aware of another mfg site on heat recovery units with a neat savings calculator....

    http://www.turbotecproducts.com/EPhome.html
  12. Robo...and I was following a thread on AC...

    Robo...and I was following a thread on AC condenser misters, not one on Cracker's junk.....
  13. My feeling is that solar PV will not be a...

    My feeling is that solar PV will not be a practical solution for a while due to the high install cost and still weak performance. Google 'EEstor' and 'Nanosolar' and see the two technologies that...
  14. Sorry, it was on page 28...I got directed there...

    Sorry, it was on page 28...I got directed there by an external link and didn't realize how old the post was until after my reply....
  15. Not very professional, Cracker.

    Not very professional, Cracker.
  16. Skip....where are you going to get a solar PV...

    Skip....where are you going to get a solar PV system for "10K-30K" that will eliminate a 250-400 a month electric bill? The numbers I've crunched said I'd need a 7Kw system at around a 50K price...
  17. generators

    I've had 2 for quite some time. An 8Kw to run everything and a 1Kw to run a window shaker at night. As you point out, the big ones consume way too much fuel. You don't know how cheap electricity is...
  18. I haven't had experience with any units with...

    I haven't had experience with any units with higher than 14 SEER rating. I've been told that their discharge temp is too low. My 13 SEER (R-22) runs at 180 on a 90 degree day here in cent FL. Plenty...
  19. Heat Recovery isn't an 'unproven techinque'. They...

    Heat Recovery isn't an 'unproven techinque'. They have been around a long time. Below is a mfg website and a power company document about them.

    http://www.trevormartin.com/about.asp
    ...
  20. Skip 2 my lou: Visited your website...well done!...

    Skip 2 my lou: Visited your website...well done! However, I see you promoting solar thermal hot water rather than de-superheating on A/C units. I know from traveling there, Houston residents use A/C...
  21. Come on, Skip 2 my lou, Solar is just not ready...

    Come on, Skip 2 my lou, Solar is just not ready for prime time yet. How can you justify me spending $60K or greater to eliminate a $135 monthly electric bill (achieved thru simple conservation and...
  22. I'm still surprised at the lack of interest in...

    I'm still surprised at the lack of interest in heat recovery units on condensers. At least York, Bryant and Dukane do not void warranties if approved units are installed by licensed...
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    more docs

    Another thing to Google is 'florida power pid-113' for another article.
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    U of F study

    Adrien...Google 'university of florida EES-26' for an interesting study of HRU's with a lot of good formulas to examine. I'd have to take exception to the study you are quoting as here in cent Fl, we...
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    roofs

    Something else that came to mind is how much better roofing materials perform now. i remember back in the 60's, as shingles got older they'd get obviously curled. Shingles nowadays maintain their...
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    leaks

    I'd still be concerned about roof leaks. A plumbing leak is an entirely different animal....constant flow of water that will eventually show up somewhere. A leaky roof will provide a sporadic...
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    Heat Recovery Units Again

    As the heat continues here in Cent FL, I continue to wonder why heat recovery units on A/Cs and heat pumps continue to be ignored. Most A/C pros dismiss them offhand saying 'they don't work with high...
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    Foam Problems

    No one in the foam business seems to want to answer what does happen when a roof leak occurs. Every sample of foam I've seen will not allow any water to pass through it. It also forms a very good...
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    I seem to have developed an opposite problem from...

    I seem to have developed an opposite problem from acnoob. When my house was built, the energy rater and A/C contractor sized my unit at 3.5 ton (2000 sq ft home in FL, meeting state energy code). As...
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    I know this is off topic but seemed important to...

    I know this is off topic but seemed important to mention....My concern with spray foam....regardless of the foam people's claim of 'open cell', I have yet to see a sample that allows water to pass...
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    temp

    Thinking about it some more, do you think your systems are actually grossly oversized? I would think any system would run even more efficiently if it was operating at full design capacity..I'm...
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    Discharge temp

    I'm so amazed at the relatively low discharge temp your system runs. You wouldn't think it could shed enough heat at the low a temp differential although I guess your water temp is around 70...still...
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    Thanks again!

    I'd like to thank the two of you for sharing your knowledge on this subject with me...I've had positive results with 3 HRU's but realize you guys have seen vast numbers of systems over the years and...
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    Temp of compressor discharge

    Here in DeLand (cent FL), the compressor discharge temp is 195 degrees on an 88 degree temp day. The data from the HRU mfg states you need an minimum of 180 degree discharge temp so I'm ok there....
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    Discharge temp

    I wonder why the compressor discharge temp of higher SEER units would be lower? Wouldn't the temp difference be at the end of the condenser coil rather than the compressor? After all, you should...
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    Air v Ground Source HP

    Are there any ground source heat pump owners on this board here in cent FL? I'm wondering how cost effective that equipment is here? It seems that after insulation, radiant barrier, desuperheater...
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    Heat Recovery Units

    For my new house, I asked my A/C guy (his own company, long time friend) to install a heat recovery unit for my domestic hot water like in my old house. He told me that it would require using an 'old...
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