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  1. Replies
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    No, certainly not. They don't really have a...

    No, certainly not. They don't really have a 'black box' system, just code on standard Alerton controllers for the most part, it's just that they have a couple programmers that are good at writing...
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    That is what I posted earlier. the best way to...

    That is what I posted earlier. the best way to optimize a plant is to record the ins and outs of all the individual pieces of equipment, so you can predict what a given efficiency is going to be at...
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    The efficiency gains are minimal, and would not...

    The efficiency gains are minimal, and would not likely ever justify the cost of a TES system. TES is all about the load shifting, due to not only the massive difference in price between peak and...
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    Ice's ONLY advantage is space. The fact that the...

    Ice's ONLY advantage is space. The fact that the temperature has to be run so much lower makes the chiller itself much less efficient. If you don't have the SPACE for water storage, and Ice is your...
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    I was not describing a 'buffer tank'. I was...

    I was not describing a 'buffer tank'. I was describing a proper TES tank. We're talking about, depending on the size of the facility, million+ gallons of stratified storage.
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    Equipment specs don't mean anything. The ONLY...

    Equipment specs don't mean anything. The ONLY way to optimize a plant is by monitoring it, and logging everything, analyzing those logs, and determining sweet spots. Chiller performance, on older...
  7. Okay, so you're using the RPi as your OpenVPN...

    Okay, so you're using the RPi as your OpenVPN server then, and connecting INTO it remotely from your laptop. That is what I wasn't getting. Still, the hard part here is usually getting INTO the...
  8. You know you can just run openvpn ON the laptop,...

    You know you can just run openvpn ON the laptop, right?
  9. Of course you can connect the Pi to the remote...

    Of course you can connect the Pi to the remote network via the VPN - and it will essentially reside on the remote network. My piont was what are you DOING wiht the Pi on that remote network. If you...
  10. What I'm not getting is how you are connecting...

    What I'm not getting is how you are connecting your equipment over the VPN via the Pi, with it only having a single ethernet port/interface.
  11. We've had been using the consumer level routers...

    We've had been using the consumer level routers for years in this facility as simple routers anyway, with the BBMD's behind them. Most of my effort was simply reconfiguring them, not installing...
  12. If you set it up as I described, then yes, that...

    If you set it up as I described, then yes, that would be the case. In my situation, there's only a single point that is shared from one building to another for control, and it has always had a...
  13. similar, using Tomato, but any firmware that...

    similar, using Tomato, but any firmware that supports openvpn should work. For my server end, I actually have openvpn running on the windows pc that's running the BMS server, though it could be done...
  14. I was certainly not saying that BBMD doesn't...

    I was certainly not saying that BBMD doesn't work, I just find it is an unnecessary step if you can put everything on the same subnet.
  15. How many actual IP devices do you have per...

    How many actual IP devices do you have per building? What is your reasoning for actually segregating the buildings? Also, if you have IT involved, you would be far better off working a way to NOT...
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    You need to ensure that the VLAN is propagating...

    You need to ensure that the VLAN is propagating UDP broadcasts to/from the server and all the BCM's. I, personally, much prefer to keep the bacnet on it's own actual network. In many cases,...
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    Also, 'cranking a unit down to 70F' is no way to...

    Also, 'cranking a unit down to 70F' is no way to reduce relative humidity.
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    944

    He did say 'rarely'. which is exactly when...

    He did say 'rarely'. which is exactly when design conditions exist. In any case, 'design conditions' are only good to use when you only care about the comfort level at design conditions. I find...
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    "Dorothy Mantooth is a saint!"

    "Dorothy Mantooth is a saint!"
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    The easy fix is to install a proper dehumidifier...

    The easy fix is to install a proper dehumidifier on the home. The quick attempt is a portable type.
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    I'd agree, it's probably humidity. Dry the air,...

    I'd agree, it's probably humidity. Dry the air, and the person who's comfortable at 71F when humid may be perfectly fine at 76F when humidity is more reasonable. a portable dehumidifier won't...
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    a dehumidifier isn't just a fix for a system that...

    a dehumidifier isn't just a fix for a system that is too big. Depending on the climate (and especially in yours) no pure air conditioner is going to maintain humidity year round. Times exactly like...
  23. It could be a grounding issue - sort of. A...

    It could be a grounding issue - sort of. A ground rod isn't going to fix it though. For safety, you really should not ever have more than one ground rod in your home. That said, there is probably...
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    Just realize that he was wearing gloves when this...

    Just realize that he was wearing gloves when this happened.
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    0.433psi per foot

    0.433psi per foot
  26. I just hate it when the ghost of Darwin is slow...

    I just hate it when the ghost of Darwin is slow and doesn't kill the idiot until after he's had offspring...
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    I just figured it was the decidedly good looks......

    I just figured it was the decidedly good looks... but I can see that too...
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    honestly, in your climate, I'm not sure it's ever...

    honestly, in your climate, I'm not sure it's ever hot or cold enough to NEED an ERV or HRV, the difference between outdoor and indoor temps are unlikely to make a huge impact, and as you said, you...
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    I hope you can see the contradiction here. It...

    I hope you can see the contradiction here. It can't be that tight, if it still breathes adequately, and that breathing in uncontrolled, and through whatever cracks and gaps it can find in the...
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    Volume would have more impact on a manual D and...

    Volume would have more impact on a manual D and the air change of the individual rooms than it would on a manual J heat load and equipment sizing. If anything, it's probably short cycline because...
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    Honestly, my first recommendation on a 3 level...

    Honestly, my first recommendation on a 3 level structure that size? Don't go with a single unit, even with dampers. Comfort levels will never be what you would want. If you were already going to...
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    Why would you wish that on anyone? I run my...

    Why would you wish that on anyone? I run my humidifier with my air conditioner at the same time here.. :-)
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    To me, the real advantage of a separate...

    To me, the real advantage of a separate dehumidifier, is that it removes moisture a LOT more efficiently than an air conditioner. (W/btu), but that is because it is not 'removing' those BTU's from...
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    could simply be blocked with sludge and foreign...

    could simply be blocked with sludge and foreign material. My guess is these coils are the low-point in the system, so sediment is most likely to settle down there. You might try backflushing the...
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    Also, having that low of a pressure on the return...

    Also, having that low of a pressure on the return headed means that the pressure at the higher levels would be less than atmospheric, meaning any minor leak would be pulling air into your loop,...
  36. Replies
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    Gravity. The static pressure drops 0.433 psi for...

    Gravity. The static pressure drops 0.433 psi for every foot of elevation. So, if each story is 10 feet, then 6 stories up the pressure would be 26 psi lower than in the basement. If you have a...
  37. Replies
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    Probably the 'best' option is backdraft dampers...

    Probably the 'best' option is backdraft dampers on the lag fans. This will not only fix the issue of the fans spinning backward, but will also likely delay the lag fans even needing to run in the...
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    The good news is skin heals from 2nd degree burns...

    The good news is skin heals from 2nd degree burns pretty well. The bad news it does so slowly...
  39. Replies
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    if there's a manual vent on the separator, see if...

    if there's a manual vent on the separator, see if there's air there or not. If it bleeds a bunch of air out, the auto-vent is not functioning, and needs to be replaced.
  40. Replies
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    I honestly don't see a reason to measure it,...

    I honestly don't see a reason to measure it, unless its just personal curiosity. In a dry climate, you can't really have TOO high of a cfm/ton, and I've seen up to 800-1000 cfm/ton work extremely...
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    Honestly, where he's at in southern arizona,...

    Honestly, where he's at in southern arizona, there is almost no time in the year where an AC would be removing ANY moisture no matter what the runtime is. Average dewpoint in tucson for the last 365...
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    Technically, mold will start growing if there is...

    Technically, mold will start growing if there is condensed water. This means dewpoint has to be higher than the coldest surface in the structure (usually the incoming cold water temp) for mold to be...
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    No, dryer air will always feel colder at the same...

    No, dryer air will always feel colder at the same temperature than humid air. Not only is the skin evaporation rate faster, but you actually lose a LOT more body heat in your lungs (actually entire...
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    Could also be a lot of dissolved gasses in the...

    Could also be a lot of dissolved gasses in the water, which will increase noise at large pressure drops (like barely open control valves). Does the system have an air separator, and is the auto-air...
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    I can't ever imagine needing 70F indoor temp in...

    I can't ever imagine needing 70F indoor temp in a desert. At desert humidities, 70F is downright chilly for most people.
  46. Replies
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    In my experience, no builder has ever done a load...

    In my experience, no builder has ever done a load calc on a tract home.... ever... Every single one has too large of equipment for the home (usually by at LEAST a ton), with ductwork from 1/2 to 3/4...
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    Sizing an air conditioned based on square footage...

    Sizing an air conditioned based on square footage is a long standing extremely poor practice, and will ALWAYS result in an oversized system. This is because there are so many variables involved, so...
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    Which is especially true when the system doesn't...

    Which is especially true when the system doesn't even have sufficient ducting for the larger equipment (almost ALWAYS the case).
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    It certainly does look like it was installed to...

    It certainly does look like it was installed to be temporary - but I can tell you, many 'temporary' measures remain permanent as long as they are working.
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    When talking about lighting inside a structure,...

    When talking about lighting inside a structure, essentially 100% of the energy consumed by the light ends up a heat in the structure. This is the same for halogen lights as it is for LED lights. ...
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