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  • Users: ZDR1985
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  1. ZDR1985

    Body temperature of concrete block

    Hi guys, Is there a way I could calculate or estimate a surface temperature of a concrete block exposed to an ambient temperature of 55C?
  2. ZDR1985

    Dehumidifier Size

    Hi, I am in Middle east with design temp of 50degC DB/30degC WB. We have fertilizer warehouse that needs dehumidified air, my question is how do I size the dehumidifier? is it just based on my air changes requirement? Thanks!
  3. ZDR1985

    air inlet at walls

    I have a battery room with 500 L/s exhaust fan. This room is cooled by decorative split unit. The thing is, there is no make up air provided for the exhaust. I cannot put air handlers as there is no space for it within the building / room. Can I just put air inlet (sand trap louver with filter)...
  4. ZDR1985

    Local panel for ductless mini split

    Hi guys, Is it possible to provide single power and control panel for multiple ductless mini split units? (not VRF). I have around 10 small electrical buildings with mini split AC units, I want single power and control panel for each building for the HVAC.
  5. ZDR1985

    Abort switches in CO2 systems

    Hi guys, NFPA 12 4.5.4.11 Abort switches shall not be used on carbon dioxide systems. Can someone explain to me why?
  6. ZDR1985

    FM200 multiple area of protection

    Dear All, I would like to ask if I could use only one FM200 container to protect multiple rooms? The size of container will be selected based on largest area protected. But what if the smallest area has fire? Do all the agent in the container discharge? Thanks!
  7. ZDR1985

    Make Up water demand

    Hi to all. I need some advice on this. The location is somewhere in middle east and the facilities were already built. Air washers were used to air condition some facilities and total make up water was calculated to be 120m3/day based on peak temperature of 55C. Note that the location is in...
  8. ZDR1985

    Inert Gas discharge time

    Hi guys, I am just a bit confused on this, so someone in here could enlighten me please. What is the difference between the two statements below from NFPA-2001 (Standard on Clean Agent Fire Extinguishing System). Distribution System Section 5.7.1.1.2* For inert gas agents, the discharge time...
  9. ZDR1985

    NFPA reference for foam concentration percentage

    Hi to all, I would like to know if there is any international code like NFPA that defines foam concentration application. I have seen in NFPA 16 foam concentration percentages such as 1%, 3%, and 6%. How do I determine which concentration percentage shall I use for a certain application? Thanks!
  10. ZDR1985

    Indoor Theme park HVAC

    I am looking at a project right now which involves hvac design for an indoor theme park within a mall with an estimated area of 5000 sq.meter for the theme park. Outdoor conditions are 46C db and 30C wb. Indoor theme park will have rides and small offices, and dining areas with kitchens as...
  11. ZDR1985

    VFD heat dissipation

    Hi to all, I am no electrical guy so I need your help. We have pumps with 14MW motor power each (9 nos) and this are VFD controlled. How much would be the heat dissipation on the VFD controller for this size? Any rough estimate or calculation would be much appreciated. As I need to determine the...
  12. ZDR1985

    VAV system

    Hi I am just new in HVAC. I have a DX system split type comprising of Air Handling Unit and Air cooled condensing unit. I will be using VAV boxes for zoning. Question is how do I maintain the fresh air and pressure requirement for my indoor conditions?

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