from the equation of state
pressure = density * gas constant * temperature
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MAT=RAT - [(RAT - DT) * ((100 - %HA)/100)] MAT = mixed air temperature ODT = outdoor design temp. RAT = return air temp. (68) DT = HRV air delivery temp. %HA = percentage of house air
ambient temp is the outside air temp
Power & Torque at rated RPM Power & Torque at Prime RPM Lubrication oil PR, Lubrication oil Temp Fuel Pressure Air Intake Temp Exhaust Temp Coolant Temp Turbo Pressure/ Temp if it is a turbo aspired Engine
The speed of sound in air changes clearly with temperature, a little bit with humidity − but not with air pressure (atmospheric pressure).Statement: The static air pressure p_ and the density ρ of air (air density) are proportional at the same temperature, because the ratio p_ / ρ is always constant, on a high mountain or even on sea level altitude.Notice: The ratio p_ / ρ (static air pressure to air density) is really always constant.
20 degree difference