UFC 3-410-01 Heating, Ventilating, And Air Conditioning
The analysis must provide calculations of system cooling load, energy/mass transfer through conditioning equipment and fans, and a system schematic indicating state point dry bulb and
To calculate mixed air properties, use a psychrometric chart or mixed air calculation formulas. The general procedure is as follows: Determine the enthalpy, humidity ratio, and specific volume of the HVAC return air and outside air streams. With h3, and ω3, determine the dry bulb temperature, relative humidity, and specific volume.
Mixed air refers to the stream of air that results from combining two separate streams of air with different properties, such as temperature, humidity, and flow rate. The resulting mixture of air will have unique properties that depend on the properties of the original streams and the proportion in which they were mixed.
The equation to calculate the Mixed air of 3 air streams is: T MA = T1 x Q1 + T2 x Q2 + T3 x Q3 Q1 + Q2 + Q3 where: TMA = The dry bulb or wet bulb Mixed Air Temperature, oF [oC] T# = The dry bulb or wet bulb temperature of each airstream, oF [oC] Q# = The flow rate of each airstream, CFM [l/s] Methodology, Equations and Examples:
Therefore, when the electricity price was at its peak, the base station system had a low power load and would discharge to the grid in part of the time. Conversely, when the electricity price was at its low, the base station system had a high power load.
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