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Where: P = Absolute pressure * lb/ ft 2 (kPa) V = Volume * ft3 (m3) T = Absolute temperature *460_ + _F (273_ + _C) R = Gas constant The actual value of R has little meaning here, but the fact that R remains constant for any given perfect gas is extremely important. 5 (I−P Units) It is possible to make similar calculations which in− clude pressure variations. An example might be to find the correct volume for an altitude of 5000 feet. Assume that the temperature is the same at both points for con− venience.
This increase in static pressure is commonly known as static regain and is expressed in terms of either the upstream or downstream velocity pressure. 22 At the exit fitting, section H, the total pressure loss co− efficient may be greater than one upstream velocity pressure, equal to one velocity pressure, or less than one velocity pressure. The static pressure just upstream of the discharge fit− ting can be calculated by subtracting the upstream ve− locity pressure from the total pressure upstream.
4 Airstream Mixtures Mixtures of two or more airstreams are a common requirement of the environmental system. The mixing of outside and return air on the entering side of the air cooling and heating equipment is the common method of introducing the outside ventilation air to the system. Outside air can be one of the greatest heating and cooling loads in more extreme climates. Assume that the airstreams are being mixed in a 50 percent ratio which causes the mixed point to be directly between points “A” and “B”.
HVAC System Test-Adjust-Balance by SMACNA