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  1. M

    NFPA 30 Fuel Dispensing area - extract fan to be spark resistant?

    Hello I am working on a simple extract system for a diesel fuel dispensing area. NFPA 30 guides the required extract CFM from the room to control the vapour concentration to max. 25% of the lower flammability limit (LFL). I see no stipulation that spark resistant extract fans are required...
  2. M

    Refrigerant indoor unit for cooling - what is the entering Wet Bulb Temperature?

    Hi I am carrying out thermal/load modelling of a building with a standard thermal modelling package. There are some rooms that are served (cooled) by indoor refrigerant units. These rooms have a summer dry bulb set-point (80 deg F). For purposes of modelling, I have set the room set point as...
  3. M

    Equipment Heat Gains / Diversity During Winter

    Hi, I was wondering how you manage the following general situation: Say you have an electrical equipment room, which when the equipment is running, the sensible heat gains are X. I want to heat / cool the room via VRF systems. The equipment rooms need to be maintained at a temperature range...
  4. M

    Trace TRACE 3D Plus - external supply air modelling query

    Hi I was wondering if anyone has experience with Trane TRACE 3D Plus? We are trying to model the following situation but cannot work out how to do it: We have rooms where we are introducing external air to the rooms in order to positively pressurize them (constant flow rate to each room)...

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