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  1. Thread: Corrosion?

    by Paulinator
    Replies
    7
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    598

    Heresite coating on all coils. Stainless steel...

    Heresite coating on all coils. Stainless steel everywhere (316). Hydrogen sulfide reacts with most metals to form corrosion. I've had experience with designing lift stations where the HVAC and...
  2. Replies
    7
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    917

    Conversion from Watts to Btu/Hr (1 W = 3.415...

    Conversion from Watts to Btu/Hr (1 W = 3.415 Btu/Hr), your calculation checks out. I'm not familiar with that model since I'm Canada but i took a look at the cutsheet. So the 30,700 BTU/Hr total...
  3. A bathroom fan that would blow in air from...

    A bathroom fan that would blow in air from outside into your space wouldn't do too much because they do not have the airflow needed (lets say max 200 CFM MAX, it would take over an hour to alone to...
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    7
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    917

    I've successfully designed several data centers...

    I've successfully designed several data centers with mitsubishi split units and some larger ones with a ducted system.

    Best bet for your 8 KW is to go with two units so you will have some back...
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    7
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    940

    NFPA 37-2006 clause 8.2.3.1 "Exhaust systems...

    NFPA 37-2006 clause 8.2.3.1 "Exhaust systems shall terminate outside the structure at a point where hot gases, sparks, or products of combustion discharge to a safe location."
  6. Running VFD's past 60hz can be done but motor...

    Running VFD's past 60hz can be done but motor torque goes down after 60 Hz, and the motor starts to lose the ability to move more air at a higher pressure.

    Achieving higher flow rates by over...
  7. Replies
    5
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    929

    Best way to do it. However, with it being two...

    Best way to do it. However, with it being two offices and a conference room even a 3 ton unit might be too big!
  8. Replies
    20
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    1,669

    If only one tower provides enough cooling for...

    If only one tower provides enough cooling for winter, then one additional bypass on either cooling towers would give you redundancy during winter (based on my understanding of your system). All...
  9. Replies
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    1,669

    Is the bypass sized to match only one tower or...

    Is the bypass sized to match only one tower or all three towers?
  10. Replies
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    1,784

    The 10ft between intake/exhaust is most likely...

    The 10ft between intake/exhaust is most likely used where the exhaust is potentially contaminated (ie. bathroom exhaust). 10ft separation is code (In canada) for this application. If it's general...
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    4,085

    I guess that's my cue to contact EH Price...lol...

    I guess that's my cue to contact EH Price...lol...
  12. Replies
    3
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    4,085

    EH Price/Titus ESV-3000 VAV box info?

    I'm doing as-builds for a commercial high rise.

    Some VAV boxes have tags that show model, inlet size and max CFM and some don't. The tag says EH Price & Titus.... (kinda weird?)

    Does anyone...
  13. Replies
    5
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    874

    Checked out the unit specs and did the temp. rise...

    Checked out the unit specs and did the temp. rise based on actual air flows on site. Can only push 120F discharge air temp. Current discharge air temp is 100F and i'm getting complaints!

    FYI,...
  14. Replies
    5
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    874

    Max supply air temp. not to burn?

    I'm going to site with the air handling unit manufacturer & building operator to increase the discharge air temp. on an air handling unit.

    Anybody know what a recommended max. supply air temp...
  15. If it comes to fan replacement, i was just going...

    If it comes to fan replacement, i was just going to specify a higher static on the fan and bigger HP. I really don't want it to come to that. I've specified many inline fans, but always work with...
  16. Replies
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    589

    Double posted... (lets make use of it) Refrigerant charge question

    For some LEED projects that i have been documenting we have DX cooled AHU's with remote condensers.

    In order to document the LEED credit i need to know the refrigerant charge in the system. The...
  17. Cook DB series cabinet fans under performing

    Got two fans that are under performing.

    Here is what is happening from the air balancer

    1) Fans are high RPM
    2) Static is 0.2" and fans are rated for .35"
    3) Flow is roughly 50-60% of rated...
  18. Replies
    36
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    3,946

    Ever consider doing contract administration?

    Ever consider doing contract administration?
  19. Replies
    21
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    33,052

    If the external static pressure is calculated via...

    If the external static pressure is calculated via duct friction losses, pressure drops through coils dampers etc... etc... wouldn't this actually be a pressure drop to the velocity pressure and not...
  20. So, the thing is.... I am only the junior here...

    So, the thing is.... I am only the junior here asking for some food for thought. I have spoken to the senior engineer here who is signing and stamping the drawings about this post and he feels...
  21. Replies
    18
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    2,211

    lol......nice

    lol......nice
  22. I will definitely keep you guys posted on how...

    I will definitely keep you guys posted on how this works out. The filter i am using is a specialty filter from AMIAD filtration systems. We are capable of filtering from 800 to 10 microns ( i have...
  23. Yea i've got the strainers covered. I am going...

    Yea i've got the strainers covered. I am going to use a self cleaning filter that purges when differential pressure across the filter is greater than a specified value. The cleaning cycle lasts...
  24. Lol... our local trane reps told us using...

    Lol... our local trane reps told us using multistacks was the way to go.
  25. Trane model CVHA (A means comes assembled). 362...

    Trane model CVHA (A means comes assembled). 362 Tons design capacity. Did cooling load calcs, and im at 200 Tons. I am going to propose to the client we change the centravac to R-123, add in...
  26. Looks like lots of people hate these suckers, and...

    Looks like lots of people hate these suckers, and a few people don't have problems with them. I don't really have any other options. The roof is full of piping everywhere, we do not have...
  27. I'm installing a filter on the condenser water...

    I'm installing a filter on the condenser water supply to avoid any pine needles/debris from entering. Thanks for your input guys!
  28. Replies
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    4,033

    Hmmm, this sounds very fascinating and still very...

    Hmmm, this sounds very fascinating and still very whimsicle to me. I am just barely wetting my feet right now learning about chillers by reading ASHREA handbooks and the like. Can someone please...
  29. I've rejected heat from elevator machine rooms...

    I've rejected heat from elevator machine rooms and electrical rooms (transformer heat gain) into heated spaces during the winter, and outside during the summer. I think it would be highly beneficial...
  30. Anybody have bad experience with Multistack (Trane) Modular Chillers?

    I got hired to do consulting on an existing office tower in my city. Chiller is up in penthouse and I am going to provide the client with modular chillers because they can fit in the elevator and up...
  31. Replies
    339
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    50,569

    Hi, im from Edmonton Alberta Canada. I've been...

    Hi, im from Edmonton Alberta Canada. I've been in the HVAC industry for 2.5 years. I do HVAC consulting as an engineer in training.
  32. Replies
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    6,359

    Wow, that's harsh.

    Wow, that's harsh.
  33. My career has been very humbling and rewarding at...

    My career has been very humbling and rewarding at times to say the least and I am glad to find a community of people that I can bounce things off of. I have been put in a bad position many times in...
  34. Perry Zapernick?! Hmm, i only know Dale and...

    Perry Zapernick?! Hmm, i only know Dale and Richard. Yea, i do need some help. Unfortunately I have been pressured into doing many things i am comfortable doing. I just finished tendering a...
  35. Ok thats what i thought. There has to be a...

    Ok thats what i thought. There has to be a relief in there somewhere to take care of the excess outside air (in my case), and to push out return air once you are in the free cooling mode. Its just...
  36. Frustrated engineer trying to learn... help?

    Hi, I have been in HVAC for a little over two years. Ten months ago, the senior engineer quit. He gave me a 300 million dollar job to handle which was not making leed... etc etc...(VAV system +...
  37. Replies
    6
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    2,801

    I wish I had a copy of carrier's design...

    I wish I had a copy of carrier's design handbooks. My company wouldnt buy them for me.....lol *but thats a whole other subject*. Thanks for your insight, I have been learning quite a bit from this...
  38. Replies
    6
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    2,801

    I've used 0.5 ACH to account for infiltration in...

    I've used 0.5 ACH to account for infiltration in the case of overhead doors.

    I've also seen a more complicated method where you assume an air velocity (500fpm is reasonable). With that you get...
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