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  1. Replies
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    get in with hospital companies be a good idea...

    get in with hospital companies be a good idea hah
    small manufacturing at a standstill here. food processing ticking over
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    also pumping power to circulate lphw chw...

    also pumping power to circulate lphw chw throughout building thats often overlooked. I think its clear that properly set maintained and optimized VAV system is the winner, I was surprised after...
  3. https://i.gyazo.com/d77331a5e05f385a7988df5ef6cb50...

    https://i.gyazo.com/d77331a5e05f385a7988df5ef6cb50a2.png

    the inputs are pressure in bar converted from 0-10v input and outputs are the sat temp
  4. I can do it with my Innotech software as we...

    I can do it with my Innotech software as we have very powerful universal curves that are customizable,ie I was able to scale every psi to a *f. I used it to control Danfoss AKV valves on a chiller...
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    take him up on his offer :) may be one local to...

    take him up on his offer :) may be one local to you
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    https://www.aircon-services.co.uk/air-conditioning...

    https://www.aircon-services.co.uk/air-conditioning-news/
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    I know of a few in UK that run fine,I cant...

    I know of a few in UK that run fine,I cant speak on the efficiency etc, as stated its best suited for inverter driven splits
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    CANT CONDEMN THEIR TECHNOLOGY OVER ONE BUTTHURT...

    CANT CONDEMN THEIR TECHNOLOGY OVER ONE BUTTHURT INSTALLATION , i WAS INVOLVED WITH XDX WHEN THEY FIRST CAME OUT AND i THOUGHT IT WAS bs ONLY AFTER i LEARNED MORE ABOUT REFRIGERATION DID i...
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    what a soap opera

    what a soap opera
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    completely agree

    completely agree
  11. Replies
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    thats just it a FCU system still requires a good...

    thats just it a FCU system still requires a good size AHU for fresh air requirements,probably somewhere like half the size roughly to a VAV AHU thats a big power consumer which rarely have vfd on...
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    70% CHW

    70% CHW
  13. Replies
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    VAV vs FCU efficiency

    Hello gents hope your weekends going well , I was wondering if anyone could point me to any infos resources regarding real world case studies and energy models to compare VAV vs FCU systems...
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    my main point of post was not whats best but...

    my main point of post was not whats best but what certain people have seen and implemented in field vs hard wired enablkes and ctrl , I would never do it in a critical environment on Bacnet ...
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    built in KWh meters (cost) and specific alarms ...

    built in KWh meters (cost) and specific alarms (remote monitoring sites) are excellent features to use comms on in my opinion
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    people get stuck on what they learned on ,...

    people get stuck on what they learned on , tridium is other one now :whistle:
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    I have had on rare occasion York send me the...

    I have had on rare occasion York send me the incorrect LCD , very close , same pins but not exact. worth checking
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    https://www.youtube.com/watch?v=tVggc70Zl1w

    https://www.youtube.com/watch?v=tVggc70Zl1w
  19. which is which

    which is which
  20. Replies
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    I dint know RIB was from Indiana :)

    I dint know RIB was from Indiana :)
  21. Replies
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    yes exactly

    yes exactly
  22. Replies
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    youre missing that a device can appear online and...

    youre missing that a device can appear online and not be in essence hibernating kind of locked up internally.
  23. you cant beat hot water

    you cant beat hot water
  24. Replies
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    hardwired always for guarrantedd instant shutdown...

    hardwired always for guarrantedd instant shutdown , mstp comms can have long delay in transmission , and also can hibernate and not respond , both can be deadly in emergency or fire. my take on it
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    Check out Invertek UK manuf with international...

    Check out Invertek UK manuf with international base , extremely competitive reliable and user friendly half the price of ABB which is major £$ when you start getting into bigger HP ...
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    Im looking at one drive a UK manuf Invertek ,...

    Im looking at one drive a UK manuf Invertek , they seem to give specific fault code via bacnet , that is a great thing for remote monitoring I think. unfortunately issue with establishing comms, ...
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    hi thanks guys yes that sounds a major disaster...

    hi thanks guys yes that sounds a major disaster with delays in networks for emergency shutdown or even stable control. Im wonder do some drives give specific alarms on the mstp? say abb etc?
  28. Replies
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    VFDs and Bacnet

    Hi I am curious and interested i hearing how many of you are utilizing HLI to drives as far and Bacnet MSTP. I have almost unilaterally been told by all that all control points should be hard...
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    what are you saying return air was pulling from...

    what are you saying return air was pulling from under the house before?
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    Titus have some great stuff on youtube

    Titus have some great stuff on youtube
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    so these Ax systems will still carry on operating...

    so these Ax systems will still carry on operating just no support or upgrades?
  32. Replies
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    Obviously improving conditions such as cooler...

    Obviously improving conditions such as cooler tower water will increase efficiency of refrigeration and chiller output. Im glad I have finally got my head around this calculation , thanks all.
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    so its simple just the outdoor air you want...

    so its simple just the outdoor air you want it to kick in and then you pick % or how many degrees to raise, Its hard not being at the machine . good luck ;)
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    found this ...

    found this https://www.danfoss.com/en-gb/service-and-support/downloads/dcs/coolselector-2/#tab-overview
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    Hi Jay hope youve been well through this crazy...

    Hi Jay hope youve been well through this crazy time , I have a feelking you stay busy thats great ,

    could you give us 1 or 2 real world examples if not too busy , I know you are referring...
  36. Replies
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    Quantity of heat = Mass of water Ltrs/ Sec...

    Quantity of heat
    =
    Mass of water Ltrs/ Sec through evap
    x
    Coefficient of water (4.19)
    x
    TD Temperature Difference (Delta T) evap in to out
    morning

    so example 10L/s X 4.2 X 5*c (dt) ...
  37. Replies
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    yeah converting the 500 constant to kw/kg will...

    yeah converting the 500 constant to kw/kg will be the tricky bit , I have passed to the mathematical department :)


    the actual flow isnt too hard its mostly l/s vs gpm


    thanks for all...
  38. Replies
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    This refers to Chiller Flow yes I think I get...

    This refers to Chiller Flow yes I think I get it now , if theres a simple way to do this in metric that will be great so dont need to convert it everytime.
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    Im messing with this , it seems to work, is...

    Im messing with this , it seems to work,

    is there a simple metric version I wonder?
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    so Both are correct and considered accurate...

    so Both are correct and considered accurate enough for energy purposes?
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    Thanks guys , is there any free programs to run...

    Thanks guys , is there any free programs to run online for this?
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    Calculating Chiller capacity

    Hello everyone I have see this formula used on here many times over the years. can someone please tell me if this is accurate enough to measure actual running capacity to measure COP or do you...
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    couldn't quite make sense of that , I do know...

    couldn't quite make sense of that , I do know distech blocks are all BACnet by default if that helps. Im sure someone will help guide you
  44. Replies
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    id paint the piping

    id paint the piping
  45. Replies
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    Id recommend using remote contact or 0-10v from...

    Id recommend using remote contact or 0-10v from BAS rather than using these parameters , very 1990s. good luck :)
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    3 reset option water or outside air then you...

    3 reset option water or outside air then you enable at a fixed setpoint and it looks like 3 options what % to reset , simple as that you choose how much reset you once. the controller does the...
  47. Replies
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    LOOKS THAT YOU HAVE 3 RESET OPTIONS , and a...

    LOOKS THAT YOU HAVE 3 RESET OPTIONS , and a temperature range adjustment for each
  48. Replies
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    http://bascustomgraphics.com/Standard_Library.html...

    http://bascustomgraphics.com/Standard_Library.html

    Highly recommended over 10,000 items
  49. haha I wasnt saying ON the space shuttle but...

    haha I wasnt saying ON the space shuttle but referring to test chamber ets , you def have more experience than me on that area , my experience and its been awhile was more the refrigeration side...
  50. actually reading the data sheet I posted see...

    actually reading the data sheet I posted see response time way way slower than what Im trying to describe , but that's the basic dimension, Id recommend talking to siemens technical sales :) ...
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