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Type: Posts; User: sbe

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  1. Replies
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    Actually what I was saying is that once an...

    Actually what I was saying is that once an installation moves beyond cookie cutter then costs skyrocket. The problem is that anything that isn't absolutely plug and play will almost certainly...
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    I think if you check my posts you will see that I...

    I think if you check my posts you will see that I am talking about exactly that. My installation is two heat pumps each with its own reverse cycle chiller...from Aqua Products.

    BTW I'd like to...
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    Yep still around. Glad you found the advice...

    Yep still around. Glad you found the advice useful. BTW I am an engineer.

    The "problem" is as you note that determining the lowest cost system is quite simple, IF you just run the numbers. Of...
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    Your analysis for the cost of funds, pre vs post...

    Your analysis for the cost of funds, pre vs post tax etc is all sound unfortunately that is the easy part to figure. But you've assumed is a $400/mo savings and that isn't at all clear.

    Remember...
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    The easiest way to tell is to look at the curves....

    The easiest way to tell is to look at the curves. You can find these on their website by navigating to Literature and Manuals then clicking the top link and then on 5th link from the top. Scroll...
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    It looks like Lifebreath has two sets of numbers...

    It looks like Lifebreath has two sets of numbers for power consumption.

    I remember a spec sheet listing 17 watts on low but I can't find it this morning and the only one I find when I go to their...
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    They must have some sort of engineering problem...

    They must have some sort of engineering problem since there are lots of ECM based air handlers that seem to work just fine. I can't imagine what it would be in the motor. Maybe the small fan has it...
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    Just to be clear I wasn't suggesting gaskets such...

    Just to be clear I wasn't suggesting gaskets such as those added aftermarket behind the plate. I was talking about using boxes with integrated gaskets on them. Totally different animal. These are...
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    I actually used a slight variant called Simple...

    I actually used a slight variant called Simple Caulk and Seal but it is very close to ADA. There are some excellent guides online to both of these methods and I highly recommend them to anyone...
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    Stopping leaks on anything but new construction...

    Stopping leaks on anything but new construction is a very difficult process. As I'm sure you are aware the problem is diffuse, sort of the "death by a thousand cuts" kind of thing.

    The whole...
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    I suggest getting a blower door test before doing...

    I suggest getting a blower door test before doing anything else and getting it from someone who only does tests, not upgrades.

    What you need to know is how much leakage you have and where it is. ...
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    Lifebreath HRV w. ECM motor noisy?

    I've been told by an installer that he had to remove a Lifebreath 155 with the ECM motor due to excessive noise. Apparently the unit sounded like it was growling which the client found problematic...
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    Trion makes a model 707-U that looks kind of...

    Trion makes a model 707-U that looks kind of interesting. Has anyone had any experience with it? It's a centrifugal atomizing humidifier which I'd never heard of before.

    One of the problems I...
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    motoguy, Thanks for the suggestions. One...

    motoguy,

    Thanks for the suggestions.

    One comment however. Although I see it all the time I don't think its really possible to say much of anything about whether or not a structure is going to...
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    So 16 hours a day, 1.6 kw/hr, that's 25 kwhrs/day...

    So 16 hours a day, 1.6 kw/hr, that's 25 kwhrs/day at about $0.10/kwh or about $77/month. Not cheap.

    Is there something cheaper than steam that works well with a heat pump or radiant? I see that...
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    Oops

    I get it now. That was 40 minutes out of every hour, yes?
  17. Replies
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    Question on run time

    Beenthere would you walk me through the calculation you did for run time? I just want to understand how one calculates this.

    On a 4000 sq ft home, with a .34 an hour air exchange, it would take...
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    I finally had a chance to rerun the loss numbers....

    I finally had a chance to rerun the loss numbers.

    Black body radiation at 143 F is 211 btu/sf/hr. At 100 F its 153. Since the patio is in equilibrium at each of these not accounting for...
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    Oh but it gets better. This guy is in Florence. ...

    Oh but it gets better. This guy is in Florence. As in Florence, ITALY. He is surrounded by some of the most beautiful artwork the world has ever created and what does he notice? That his sink...
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    Way too simple a solution. We are artists. We...

    Way too simple a solution. We are artists. We must suffer for our creations.
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    After your last set of suggestions I went online...

    After your last set of suggestions I went online and was successful in finding a number of options for an in deck nozzle. It turns out the magic words are "fountain" and "pool." I'm going to...
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    Thanks for the links. You just have to love a...

    Thanks for the links. You just have to love a world in which there is a web site called "laminar flow in my sink."

    I'm going to think about what I could extract from these that would result in a...
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    Shophound, You're going to have to stop this! ...

    Shophound,

    You're going to have to stop this! That was exactly were I was thinking to put them. I guess I should have expected good ideas from someone who quotes Joe. I was responsible for the...
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    I keep finding things I forgot to answer. It...

    I keep finding things I forgot to answer.

    It is a custom designed home. I'm afraid I opened this can of worms. One of the samples of the slate (the original material spec'ed for all the...
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    You guys are dead on with regards to evaporative...

    You guys are dead on with regards to evaporative cooling. As a quick look at the tables will tell you the energy sucked up by turning liquid water into vapor is way, way more than the energy to...
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    First off my apologies for not responding to your...

    First off my apologies for not responding to your post but I didn't see it.

    I agree with regards to your comment on the surface loop. In fact I've allowed for a water facet down near the pool...
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    Shophound, These are all extremely good...

    Shophound,

    These are all extremely good comments for which I'm very grateful. Let me walk through them one by one in the hopes you will continue the conversations.

    The house is built, the...
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    I take that as a compliment because its not...

    I take that as a compliment because its not possible to make such a thing except for any given set of conditions. Take the example above where the savings is $300 a month, is that a good deal or...
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    Well I ran a standard heating calc backwards so...

    Well I ran a standard heating calc backwards so perhaps this is a good approximation..

    Assume 50 btu/sf, 1000 sf, 50,000 btu yields 5 gal/minute. Assume .5 gal/loop (5 fps 3/4" pex) yields 10...
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    I agree with your sentiments regarding passive...

    I agree with your sentiments regarding passive solutions. My dad always said the parts you don't install have zero cost and 100% reliability.

    Maybe I'm just making a mountain out of a molehill. ...
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    Circulating the pool water isn't a very good...

    Circulating the pool water isn't a very good idea. The delta T is quite low, think 80-85 F pool water and 100 F stone so the amount of heat transferred isn't very much.

    As for the source of the...
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    Its very hard to have an useful discussion...

    Its very hard to have an useful discussion regarding geo vs air sourced hp without a discussion of ROI. And its not possible to discuss ROI without talking $ which isn't allowed. However what I can...
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    Radiant Cooling of a Patio

    I'm wondering if anyone would be willing to give a suggestion for how to calculate the loop lengths for cooling a patio. Here are the parameters.

    Assume I need to remove 50 btu/hr/sf. My...
  34. Thread: ERV HRV

    by sbe
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    I don't but unless I'm missing something you were...

    I don't but unless I'm missing something you were proposing pumping air into a structure. That would pressurize the building, yes?
  35. Thread: ERV HRV

    by sbe
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    We can take Christmas off and take this up again...

    We can take Christmas off and take this up again after the New Year if you like, but I don't think you answered my question.

    As I'm sure you are aware vapor migrating into the wall cavities cannot...
  36. Thread: ERV HRV

    by sbe
    Replies
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    Clear. However my concern is that the pressure...

    Clear.

    However my concern is that the pressure isn't so much that there is significant vapor migration into the wall cavities during the winter months and condensation.

    How much positive...
  37. Thread: ERV HRV

    by sbe
    Replies
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    Let me stick a few cents in here. For many, if...

    Let me stick a few cents in here.

    For many, if not all, units the equipment for an ERV and HRV is the same except for the core. In fact you can buy two cores and run the ERV during those times...
  38. Thread: ERV HRV

    by sbe
    Replies
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    3,384

    I'd like to ask a question about what you said to...

    I'd like to ask a question about what you said to see if I understand it correctly if you don't mind.

    When you talk about 60 cfm of make-up air are you talking about putting the house into a...
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    The answer is you are exposing my ignorance :). ...

    The answer is you are exposing my ignorance :). I'm an electrical engineer, not a HVAC guy so while I am comfortable with the logic portion of the design I'm dependent on the vendor to tell me what...
  40. Thread: ERV HRV

    by sbe
    Replies
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    That is what I am waiting for. It doesn't...

    That is what I am waiting for.

    It doesn't affect my equipment selection because I have to size the HRV/ERV for the amount of make up air I need (quite a bit due to the 48" pro range) but the...
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    I'm not the OP. My installation is 10 tons (two...

    I'm not the OP. My installation is 10 tons (two 5 ton units. this allows us to run one in heat and the other in cooling or both the same way). We wouldn't be heating the pool in the off season,...
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    The plan is....oh wait there isn't a complete...

    The plan is....oh wait there isn't a complete plan yet. Let me explain.

    Heat is radiant, cooling a water coil in (two) air handlers. The tricky part is that I'm also trying to use the rcc's to...
  43. Thread: ERV HRV

    by sbe
    Replies
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    3,384

    I almost always see people talking about the...

    I almost always see people talking about the amount of fresh air that is required without any consideration of the size of the structure. This seems odd. Wouldn't the correct procedure be to
    ...
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    I'm looking at this one. I've got to pin them...

    I'm looking at this one. I've got to pin them down on their COP vs air temp numbers. My impression is that these are mostly used for cooling with a bit of heating now and then so they haven't...
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    I've been looking closely at air to water heat...

    I've been looking closely at air to water heat pumps for about two years now and you're right there isn't much out there.

    The number add up very nicely in Portland due to our almost unique...
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