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  1. Replies
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    Unless outdoor dew point is relatively constant,...

    Unless outdoor dew point is relatively constant, you cannot determine that 'low relative humidity' is the result of an improper air change or not. There is a given amount of moisture in a room, and...
  2. Any piece of equipment that can be damaged by a...

    Any piece of equipment that can be damaged by a very short power dip or outage should have electronics in place to delay restart. The electronics to accomplish this are ridiculously cheap, so...
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    Having an oversized furnace is not going to be...

    Having an oversized furnace is not going to be the end of the world. A 2-stage would be nicer, as it would minimize the instabilities of the unit cycling on and off, but I'm not sure the amount...
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    Part of the overall issues, and something...

    Part of the overall issues, and something particular to gyms and dance studios, for instance, is that indoor moisture build-up is not related to outdoor moisture levels - unlike...
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    I believe that technically, the louvered door and...

    I believe that technically, the louvered door and mech closet ARE the return plenum. This is hardly an uncommon install practice. My only real issue with this install (other than the OAT sensor...
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    If you are unable to get a refund on the 400, the...

    If you are unable to get a refund on the 400, the price of the 700 is likely going to be more than finding a real installer to put a short plenum on the furnace inlet, or even cut in a new port on...
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    Did you ever find a good solution for this? My...

    Did you ever find a good solution for this? My hunch is that a 'custom' item would be required here for the best use - something like making up and sealing a cable of 1-wire temp sensors (Maxim...
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    I think it you really wanted to define it, it's...

    I think it you really wanted to define it, it's be any system that cools a working fluid, and that working fluid then cools the load. This would be in contrast to a DX (Direct eXpansion), where the...
  9. I think you (whatever GOOD designer you find)...

    I think you (whatever GOOD designer you find) need to first look at the structure, and completely ignore what is currently there. Come up with the ideal design that will say how much heating and...
  10. Replies
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    Looks like it's in the process of fixing itself...

    Looks like it's in the process of fixing itself anyway, right?
  11. Replies
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    Don't be afraid to sit on your ass or hip instead...

    Don't be afraid to sit on your ass or hip instead of kneeling. Humans weren't made for kneeling long, and we've got nice padded rumps for a reason.
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    that certainly does look crowded. That tight of...

    that certainly does look crowded. That tight of quarters I'd worry about the 100% OSA units pulling in a lot of condenser heat.
  13. Replies
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    I think DGLux's power resides in the fact that...

    I think DGLux's power resides in the fact that every property of every on (and off) screen object can be tied to logic. This opens up a LOT of interaction that can be done that simply isn't possible...
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    The type of sensor they use really shouldn't be...

    The type of sensor they use really shouldn't be susceptible to much zero drift, which is why the simple included the scaling factor, and not a zero shift.
  15. Replies
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    4,098

    "Most common" doesn't mean best (or even good,...

    "Most common" doesn't mean best (or even good, for that matter). Most 'common' hvac guys will size a unit from the drive-way as well. A flowhood is the best way to measure the flow in or out of a...
  16. 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...
  17. Replies
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    12,457

    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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    12,457

    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...
  20. Replies
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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.
  21. Replies
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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...
  22. 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...
  23. You know you can just run openvpn ON the laptop,...

    You know you can just run openvpn ON the laptop, right?
  24. 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...
  25. 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.
  26. 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...
  27. 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...
  28. 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...
  29. 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.
  30. 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...
  31. Replies
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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,...
  32. Replies
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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.
  33. Replies
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    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.
  36. Replies
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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...
  37. Replies
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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...
  38. 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
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    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...
  42. Replies
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    1,119

    I just figured it was the decidedly good looks......

    I just figured it was the decidedly good looks... but I can see that too...
  43. Replies
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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...
  45. Replies
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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...
  47. Replies
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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,...
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