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  1. 317069

    energy consumption is very high-centrifugal chiller

    What are the name plat capacity of the chillers compressors? what are the numbers, 2708333, 879167, 14423077, 152243549 and what are the units (dollars, KW/H, ..etc.)
  2. 317069

    Rehabilitation Code

    What is the difference between two office's common corridor and two offices common return air plenum above suspending ceiling when the HVAC system is running
  3. 317069

    Carpark Natural Ventilation

    Joseph56.......................................................................... Engineering principals are the same in 79 and present, there is nothing called 3 sides or 4 sides natural ventilation, there is a flow rate should be ensured to a space by a natural or mechanical mean.
  4. 317069

    Carpark Natural Ventilation

    it is not about feeling or even engineering, it is about code and legal issue for the future, local code says minimum 50% of free area, it is clear, you have 50%, no problem, you have 49.99% you are against the local code, use code definition not your company or client definition. you can talk...
  5. 317069

    Direct fired MUA

    "This is not the way I'd like to do it", what would you like to do? you want to use static pressure, but it looks like you want to run MAU with capacity more then 10% of the exhaust capacity, otherwise there is no reason to try to avoid table B149 requirement.
  6. 317069

    Direct fired MUA

    Each MUA cannot be interlocked with more than one fan. In BC, MUA can be interlock with a fan that represents the 1/20 of total exhaust rate, I could not understand it clearly, can you give an example, Table B149.1 is not mentioned in Ontario Building Code I belief but need double check.
  7. 317069

    chillers paralleling

    Is this a new project or existing project, if it is an existing project, did you have this problem recently?
  8. 317069

    Outdoor air for Brewery

    Hello, I am looking for the outdoor air rate required for a brewery project, ASHRAE 62 refers to ACGIH, ACGIH says the outdoor air rate must be as ASHRAE, any supported advise and thanks in advance
  9. 317069

    ASHRAE 183 or equivalent Heating and Cooling load calculations worksheet

    Contact ASHRAE. ask them about such spread sheet, if they have it buy it, it is 58 dollar, I think the spread sheet city meant is about air leakage calculation and basement heat loss, not the entire calculation.
  10. 317069

    Room Pressurization

    Lilliput1, I didn't understand the experience rules exactly, do you mean that 0.001 in wg will cause a 400 cfm to leak through the door, I mean if we have 1000 cfm supply then we need to return 600 cfm to the AHU and 400 through the door? and what does cfm2= 2122 mean in your example...
  11. 317069

    Space cfm calculation in a residential house

    Hid, don't go to far, before you suggest anything, my post was about adding ventilation load to the space level or to the equipment level, for your information, HRAI, and CSA F280 add ventilation load to the space level. most existing houses do not have outdoor air ducts, recently they start to...
  12. 317069

    Space cfm calculation in a residential house

    Thank you lilliput1, but the question is: where did mixing happen? does OA mix with room air in the room space or right before the furnace? the idea of the post is weather to include the OA load in space load or coil load?
  13. 317069

    Space cfm calculation in a residential house

    Thank you trashcanman, it is helpful, my concern is if we consider the OA loas as a coil load or a zone load, my HAP software take it as a coil load, but another opinion is to consider it as a zone load, ans as you know the cfm depend on zone load, if we take OA as a coil load then why we take...
  14. 317069

    Space cfm calculation in a residential house

    ...+ infiltration): 60000 Btu/hr - OA ventilation requirement 100 cfm, (7560 Btu/hr) the question is about air flow calculation: 1- cfm = 60000/(1.08*(120-70)) = 1111.11 cfm 2- cfm = 67560/(1.08*(120-70)) = 1251.11 cfm which one is much correct.? Do we consider ventilation load in space cfm...
  15. 317069

    for a regular house HVAC system (Fu

    dbill74, when we say 1600 cfm @.5", does 0.5 " here includes cooling coil, heat exchanger, filter, duct system, and grilles or just duct system and grilles. please note that 1600 cfm and 0.5" are just examples to explain my question. I am not asking in regard to a certain design, I am asking in...
  16. 317069

    for a regular house HVAC system (Fu

    DrRTU, I am not worry about heating vs cooling, my concern is about if the heating dp equal to cooling dp.?
  17. 317069

    for a regular house HVAC system (Fu

    Dr. RTU, I agree with you but as I mentioned before I am asking about the theory not a specific design. dbill74, my concern is about using the same cfm at the same pressure loss for heating and cooling for a regular small house with simple furnace, AC unit, and simple duct design, is it right...
  18. 317069

    for a regular house HVAC system (Fu

    I agree, we must run room by room load and duct design, but my question is about principals, I am saying that when heating cfms different than cooling cfms, then the index circuit in heating mode is not the same one in cooling mode, is it right?
  19. 317069

    for a regular house HVAC system (Fu

    What about 1600 cfm @0.5" in heating and 1600 cfm @0.5" in cooling for the same furnace and same house, is it right to say that?, And as you know when we calculate fan pressure we use index circuit ( the circuit having the highest pressure drop), is this circuit the same in heating and cooling...
  20. 317069

    for a regular house HVAC system (Fu

    for a regular house HVAC system (Furnace and AC unit), is the external static pressure the same in both heating and cooling modes? in my understanding the answer is No. I mean can we say the furnace fan is 1600 cfm @ 0.5" for heating and 1600 cfm @0.5" for cooling.

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