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  1. pablo2410

    presurization of main stairs¦ building

    ok the volume of the stairwell is 1,100 m3. Which criteria will determine the air changes? and how do i know the pressure i need to maintain
  2. pablo2410

    presurization of main stairs¦ building

    Hello I need to select a fan to presurize a 21 floors bulding´stairs. Which parameter will determine de cfm required for this porpuse? the building is located in Dominican Republic. Thanks.
  3. pablo2410

    selection of 2 pumps working in paralel pipe

    Ok, here is some data, a chilled water secundary circuit, (not open to atmosfere), 35´drop pressure due to fricction through the pipe,10´drop pressure due to valves and fittings, 8.5´drop pressure through a coil, (all this in the critical circuit). Total system head estimated= 53.5 ftwc Total...
  4. pablo2410

    selection of 2 pumps working in paralel pipe

    Hello, I would like to know the procedure for selecting 2 pumps to work in paralel both recirculating half of the total flow.
  5. pablo2410

    UNDERGROUND CHILLED WATER PIPING

    You could look here too. www.thermalpipe.com in this situations, it is recommendable to use pre-insulated pipe with a PVC cover for protection. It saves a lot in installation cost and is not that expensive.
  6. pablo2410

    Interior Shading = More cooling???

    (To schola) But is not the heat gain from direct solar radiation trough the windows suposed to drop down?
  7. pablo2410

    calculation of a 100% outside air cooling load

    ok, here is the problem a locker room Area 3550 sqft height 10ft 35 persons in the room what will be the diference in my load calculation if the system is 100% recirculate air or 100% outside air.
  8. pablo2410

    calculation of a 100% outside air cooling load

    Ok, so far, all the things that had been told here, i already knew it.I think i,m not asking the right question, so here i go, how can i determine the total cfm that is required to pass trough a cooling coil in a system that requires 100% outside air, or how do i know how many changes of air do...
  9. pablo2410

    calculation of a 100% outside air cooling load

    Ok, (willard3) the first formula you gave, me was a variation of the first law of thermodinamics, another way to put it is using the mass flow times the enthalpy difference between ambient condition and dew point condition, but in both cases i need a flow of air in terms of mass or volume, and...
  10. pablo2410

    calculation of a 100% outside air cooling load

    What i want to know is how can i determine the CFM needed for the area.
  11. pablo2410

    calculation of a 100% outside air cooling load

    Thank you all of you for your help Here comes another question, how can i calculate mass flow, i mean, i know the volume of air in the room, but how do i know how many times do i have to recirculate it
  12. pablo2410

    calculation of a 100% outside air cooling load

    Hello, I´m new in this forum and have a question. I need to calculate de cooling load of an area that demands 100% outside air, and to be honest, I don´t Know how to do it. There are some questions that comes to my mind: What should be the leaving air temperature? The loads produce by people...

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