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How do I determine the pressure drop of air across an opening? For example if I have 3,000 L/s (3 m3/s) and an opening of 8.4 m2 I know the velocity is 0.4 m/s. If the free area is 80%, the velocity increases to 0.45 m/s. What I'd like to cal is the pressure drop in each case. Cheers

Yes its in Australia but not near the coast. The outdoor design in winter is around -1.0C. The condensation is on the inside of the external windows. Sounds like double glazing and adequate ventilation for wet areas is the answer. I'm a little surprised there are no little window heaters for...

Thanks [thumbsup2]

I have a project that I'll be looking at in Aust. They have a block of home units that gets massive condensation on the inside of the glass windows and this leads to serious mould issues and corrossion/damage to the window surrounds. Im thinking double glazing. This problem is surely not...

What would be acceptable "industry standards" for insulating condensate drains in unconditioned spaces (like in ceilings of houses in warm places like Sydney Aust) for air cooled split conditioners. I'm guessing first 2 meters for PVC and first 5 meters for copper. Clarification greatly...

Haven't measured but from what I've seen, when new around 3 - 4 mm.

I have a shutter that uses a lead weight to counter the weight within the frame of the shutter. The shutter can be opened and closed by hand and the lead counter weight connected by cable and rollers slides up and down an aluminum extruded section that forms part of the frame. The problem is...

I have seen climate type SN, N, ST and T in refrigerators. Can anyone give me a reference to find out what they are? I believe that they relate to ambient operating conditions and understand (have been told) that they relate to SN = 25C; N = 32C; ST 38C and T 43C. Are these numbers correct?