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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

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.

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...

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

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.

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

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.

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...

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...

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

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

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...