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  1. If you are pulling air out of the box (the...

    If you are pulling air out of the box (the building), then air will also be flowing back into the box. If you don't give a specific path for that air to go in through, than it will find it's own way...
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    In the systems I've worked with, the chilled...

    In the systems I've worked with, the chilled water provided to the MRI equipment is essentially condensing water for the cryo chiller that keeps the superconductor's helium shield cool. Typically,...
  3. Poll: There are plenty of units out there.. Geothermal...

    There are plenty of units out there.. Geothermal is just one of the ways of getting much better thermal performance - another is evaporative condensing units - it all depends on the climate. The...
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    Not entirely sure what you are asking - but I...

    Not entirely sure what you are asking - but I think you are talking about in VisualLogic, the different tabs/pages in the document. Those tabs are essentially just pages for your own use to organize...
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    I believe this is set as the ToS (Type of...

    I believe this is set as the ToS (Type of Service) in the IP Packet header - which can be used by some routers to determine routing priority. I honestly cannot ever foresee a reason to set this to...
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    Webtalk can export that info... or, depending on...

    Webtalk can export that info... or, depending on how computer saavy you are, you can open the files directly from excel, but it takes some learning to figure out how they are stored and archived.
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    True, but it did get me to read through that...

    True, but it did get me to read through that great thread....
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    One could make logic that does count...

    One could make logic that does count hour/minute/day/month/year AV's, triggered by the currtime object, if desired, but it might be just as easy to have a very cheap/simple bacnet clock...
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    While true, I can't see a real use case for...

    While true, I can't see a real use case for needing it. The question posed here was more an issue of an absolutely terrible engineer, than it is a limited platform. Seriously - there's no excuse to...
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    As I was saying, the hardware supports analog...

    As I was saying, the hardware supports analog schedules just fine, and I use them often for resetting room temps and such - it's more an issue of the terrible Envision software making assumptions...
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    While you can read device object properties in...

    While you can read device object properties in VisualLogic (off-hand, that would be written in visual basic as T8-0-56, or something similar), it can't handle non-numeric data, so it will read in as...
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    I think the issue, PHM, is that the humidistat...

    I think the issue, PHM, is that the humidistat itself is in the room, so it gets to its setpoint very quickly, and shuts down the solenoid valve. This is why there isn't a significant humidity...
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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...
  14. 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...
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    DewPoint should stay fairly steady day to night...

    DewPoint should stay fairly steady day to night (as you said, unless a weather shift moves through that brings in or takes out moisture). Wet Bulb =/= Dew Point though, and in some regions (dryer...
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    The IDCP is not in Saudi Arabia, and has nothing...

    The IDCP is not in Saudi Arabia, and has nothing to do with any Mosque or Mecca. The IDCP that is described is the plant in Qatar, on 'The Pearl' - a man made island, where it cools nearly every...
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    Also, no storage, but this: 130,000 tons...

    Also, no storage, but this:

    130,000 tons
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    Something else you'll notice in the TECO images,...

    Something else you'll notice in the TECO images, as well as most district cooling plants, is the massive Thermal Energy Storage tank. That is a huge part of the overall system efficiency, in that...
  25. 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...
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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?
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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.
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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.
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    "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...
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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...
  38. It is more a function of simply running the...

    It is more a function of simply running the system itself more efficiently, than it is any electrical magic. In the case of your condensers, it is far less efficient running a pump that is too big...
  39. 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...
  40. You know you can just run openvpn ON the laptop,...

    You know you can just run openvpn ON the laptop, right?
  41. 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...
  42. 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.
  43. 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...
  44. 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...
  45. 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...
  46. 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.
  47. 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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    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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