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Type: Posts; User: watercop

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  1. Replies
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    Whenever we install a desuperheater / heat...

    Whenever we install a desuperheater / heat recovery system, we include an extra tank upstream of the tank (or tankless) water heater. The desuper then has coolest possible water to work on and its...
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    Every indication from my Trane dist is that...

    Every indication from my Trane dist is that Hyperions are here to stay. I'm 2 for 4 on warranty problems, and they seem to leak a lot of air, but I still like them; just hope they work the bugs out.
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    True, but...

    ... it tops out at 500 hits, so where's the harm?

    I could search on "HVAC" or "that" or "meter" or "guage" or "cold" or "no DIY" and have similar 'risk' of many many hits.

    My particular issue...
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    Still an issue... The function now allows...

    Still an issue...

    The function now allows sub-4-character search subjects but fails to return results.

    For example, a search of "eev" is accepted but returns no results, but a search for...
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    Thanks for that - interesting that "EEV" didn't...

    Thanks for that - interesting that "EEV" didn't return more results.

    I was similarly frustrated awhile back by the inability to search for "20i" (as in Trane) - same basic result. I don't...
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    search function shortcoming

    The refusal to search for a short word is really annoying, often rendering the search function virtually useless.

    For instance, I'm having problems with a Trane EEV. So I ran a search on "Trane...
  7. That size house with described features should be...

    That size house with described features should be able to be designed so as to load out to about 2 tons. Then you have to figure out the cost increment between a high end two stage air source and a...
  8. Thread: pond.

    by watercop
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    3,051

    Visit Greenbuildingtalk or Geoexchange.org for a...

    Visit Greenbuildingtalk or Geoexchange.org for a slightly less "reprimanding" experience.

    Pond sounds deep enough, but it must be reliably so. If it dries out some hot summer you could be very...
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    Before you commit to 4300 SF please look into the...

    Before you commit to 4300 SF please look into the 'not so big house' series authored by Sarah Susanka. Chances are you don't need anywhere near that SF

    That said, responding to your numbered...
  10. If it is a small attic consider having closed...

    If it is a small attic consider having closed cell sprayfoam applied to the underside of the sheathing and sealing the attic. With that done the space is pulled into the building envelope as an...
  11. I second that. As owner you want a turnkey...

    I second that.

    As owner you want a turnkey solution. If you separately contract with two or more parties, each can fingerpoint the other(s) if the integrated result is subpar. YOU DON'T WANT THAT!...
  12. Consider paying for a Manual J and D analysis...

    Consider paying for a Manual J and D analysis independent of bidding contractors. I do them for $300 for a typical house, and the reports (whole house load, individual room airflow needed, individual...
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    Free cooling, if I understand correctly, is only...

    Free cooling, if I understand correctly, is only feasible where earth temp is well below 50*F, else proper dehumidification is impossible. Places where earth temp is < 50 typically have short cooling...
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    Float switch trips out all 24 volt control power...

    Float switch trips out all 24 volt control power to unit and stat. When float switch returns to normal the stat will annunciate "wait" for up to 5 minutes depending on its setup.

    A properly...
  15. What happens during shoulder seasons during which...

    What happens during shoulder seasons during which little or no heating / cooling is needed?

    The "very small" on demand system has to tote the whole hot water load without preheat assistance. Does...
  16. Two tanks, without a doubt. Size the main tank...

    Two tanks, without a doubt.

    Size the main tank for the home's highest hourly hot water demand.

    Size the preheat tank for the home's typical daily hot water demand

    This arrangement is most...
  17. Another issue favoring use of two stage...

    Another issue favoring use of two stage compressors is humidity control. If humidity is a problem go with a two stage unit - it will run longer in lower stage and dehumidify better if it is set up...
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    That's a new one on me as well - thermostats do...

    That's a new one on me as well - thermostats do all manner of funky things these days, but it all comes down to sending 24 Vac down a particular conductor, or not...I don't see a grey area in that...
  19. Efficiencies are (or at least should be) rated at...

    Efficiencies are (or at least should be) rated at identical conditions mandated by AHRI, the industry clearinghouse for the ratings. The ratings are at conditions quite favorable to the equipment;...
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    Avoid yelling...no one wants to help a yeller ...

    Avoid yelling...no one wants to help a yeller

    Water temps you wrote are well within bounds.
  21. If EWT is low enough, there is no actual need to...

    If EWT is low enough, there is no actual need to run 1.5 GPM per ton. Water could come in at 60 and leave at 100 and still be within bounds for system operation albeit at some loss of capacity and...
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    Up in VA you may have entering water temps in the...

    Up in VA you may have entering water temps in the upper 50s or low 60s which makes for extremely efficient cooling performance. However, the system may be operating so efficiently that the compressor...
  23. 3/4" vs 1" loop pipe shouldn't be presented as an...

    3/4" vs 1" loop pipe shouldn't be presented as an extra cost option. Instead the proper diameter should be chosen to maintain the best balance between minimizing pump power and ensuring turbulent...
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    Where are you? It is sometimes the case that...

    Where are you?

    It is sometimes the case that more / hotter water is made in winter since heating operation is often characterized by higher compressor discharge pressure and temp.

    I'm near...
  25. Clogged drain would take all low voltage power...

    Clogged drain would take all low voltage power off unit if equipped with float switch.

    Has anyone looked at the possibility of high entering water temp?
  26. Absolutely go with a buffer tank. It gives the...

    Absolutely go with a buffer tank. It gives the desuper both cool water to work with and plenty of time to work on it.
  27. Replies
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    come on over to geoexchange.org or...

    come on over to geoexchange.org or greenbuildingtalk / geothermal heat pumps for both more civil and less censored discussions of geo
  28. Replies
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    If bacteria is in fact a problem in unheated...

    If bacteria is in fact a problem in unheated water tanks, why isn't it a concern in cold water lines, well tanks, etc.

    While I would avoid having potable water stagnate for weeks or more at a...
  29. Replies
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    "All-in-one" systems are more commonly called...

    "All-in-one" systems are more commonly called "package" systems.

    Splits have separate cabinets for compressor and air handler, connected by refrigerant lines.

    Package units combine everything...
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    Off the top of my head I'd look to incorporate...

    Off the top of my head I'd look to incorporate actual COP / EER measurements.

    Measure current / power, air flows, delta-T, delta-P.

    Maybe rig some ductwork to the system to demonstrate effects...
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    20x20 is nowhere near enough return or filter...

    20x20 is nowhere near enough return or filter area for 6 tons. The ECM blower 'knows' this and compensates by spinning up to get as much CFM as it can.

    Six tons at nominal CFM / ton needs 2400...
  32. Thread: Geo Thermal

    by watercop
    Replies
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    1,322

    GreenBuildingTalk and Geoexchange

    GreenBuildingTalk and Geoexchange
  33. Replies
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    Shouldn't need anywhere near 8 GPM for an 026....

    Shouldn't need anywhere near 8 GPM for an 026. For an open loop you can go as low as 1.5 GPM per ton so long as source water is 50 deg F or above. At 48 you should need no more than 4 GPM or so.
    ...
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    Cooper Atkins DFP450W

    I just ordered one off EBay. I saw it yesterday at the Cooper booth at ACCA in Tampa. The tip necks down much narrower than typical digital thermometers
  35. Replies
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    Nope. That superheated gas is already quite hot,...

    Nope. That superheated gas is already quite hot, and, being a gas it has low specific heat, so adding more raises temp relatively more. If you did find a way to significantly raise the temp of that...
  36. Replies
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    3400 SF conditioned with a single 038 dual stage...

    3400 SF conditioned with a single 038 dual stage in North Florida. Holds setpoints in any outside air temperature between 25-95 in stage one. Man J design temps 30 and 93

    Closed cell spray foam is...
  37. The idea that turning off a storage electric...

    The idea that turning off a storage electric water heater for hours each day saves significant power or money is a complete myth
  38. Replies
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    On days with little or no heating or cooling...

    On days with little or no heating or cooling (spring / fall) primary water tank steps in and provides all domestic hot water. Geo with DSH only produces hot water in the course of heating or cooling...
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    I disagree - a unit sized to meet worst case...

    I disagree - a unit sized to meet worst case demand in a heating-dominated climate will run with much shorter cycles than one allowing for occasional strip use. Those shorter cycles decrease...
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    Don Sleeth, author of HVAC-Calc, provides tech...

    Don Sleeth, author of HVAC-Calc, provides tech support last I checked. Google ground water or deep earth temps for a national map with temperature contour lines.

    EWT is only same as ground water...
  41. Replies
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    Not much difference between WF, CM, FHP, Hydron...

    Not much difference between WF, CM, FHP, Hydron Module. All use Copeland 2 speed scrolls and similar components
  42. Replies
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    I think you have a case in that Carrier's...

    I think you have a case in that Carrier's documentation appears to demand an ECM. You might have an avenue via the permit and inspection process - inspector should require system to be installed in...
  43. Depends on loads, climate, ground temp, etc. Also...

    Depends on loads, climate, ground temp, etc. Also must consider aggressive corrosion by pool water.

    I'm not saying it can't be done, in fact its on my to-do list of things to try some day, but it...
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    I'd give it a qualified yes. I'm involved in geo...

    I'd give it a qualified yes. I'm involved in geo installs in North FL, similar climate to Houston. The basic design issue is entering water temp - If it gets much above 90, efficiency of geo drops...
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    Would you prefer that water leaked into the...

    Would you prefer that water leaked into the attic?

    If the water is absorbed by the sheathing wouldn't it then get cooked off when next the sun came out?

    Is it a requirement that sheathing be...
  46. Replies
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    Sealed attic will almost certainly bring loads...

    Sealed attic will almost certainly bring loads down, especially if ductwork is in attic.

    We use closed cell since we like its extra strength and that it is a secondary vapor barrier
  47. Replies
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    This isn't a site geared toward DIY, regardless...

    This isn't a site geared toward DIY, regardless of your engineer / PE creds (no offense, I have those same creds, but I had to earn my chops here with EPA cert and contractor license)

    Try...
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    "I noticed that as the EWT increases so does the...

    "I noticed that as the EWT increases so does the delta t in the loop. At 28 degrees in stage 2 the delta t is about 3.5 to 4 degrees. At 40 degrees I measured the delta t at 6 degrees. Doesn't this...
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    Cheaper fix might be to resolve plumbing problem...

    Cheaper fix might be to resolve plumbing problem with present setup so as to balance flow between the two wells and then add a mini-split to chilly kid's room and a vented Propane heater for the...
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    Oops - somehow got 3 ton on my brain. My bad! ...

    Oops - somehow got 3 ton on my brain. My bad!

    Editing above for 4 nominal tons and 8 GPM:

    8 GPM still OK, though on the low side for 2nd stage. Extracted heat rates for 4 ton should be 20 and...
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