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Basic Air Conditioning Calculations: The air conditioning loads are the Sensible Heat Loads + Latent Heat Loads as explained below: Sensible Heat Loads: Sensible heat gain is directly added to the air-conditioned space by conduction, convection, and/or radiation. Sensible heat load is a total of:
D. Determine inside and outside design temperatures—assume inside space temper-ature has dropped to the outside design temperature because doors have been open for an extended period of time. E. Use sensible heat equation to determine heating requirement using CFM and inside and outside design temperatures determined above. BHP3φ M/D EFF.
Section #9-Determining the TRUE % of OSA Using Charts and Formulas. • The TRUE percent (%) of outside air entering into the building via the air handling unit is found by using percentage charts or formulas. The next couple of slides will demonstrate both. OA Percentage Chart.
CLTD (cooling load temperature difference), SCL (solar cooling load factor), and CLF (cooling load factor): all include the effect of (1) time-lag in conductive heat gain through opaque exterior surfaces and (2) time delay by thermal storage in converting radiant heat gain to cooling load.
25 Απρ 2022 · Example: 2,000 CFM of outdoor air (Ventilation Air) at 90°F and 40% relative humidity (RH) is drawn through a cooling coil that brings the conditions to 55°F and 100% relative humidity (RH) Step #1 – Plot the given conditions on the Psychrometric Chart. Step #2 – Get the h1 and h2 values from the Psychrometric Chart 34.9 and 23.2.
Algebraic expressions for the correction factor Fhave been developed for vari- ous shell-and-tube and cross-flow heat exchanger configurations [1–3], and the results may be represented graphically. Selected results are shown in Figures 11S.1 through 11S.4 for common heat exchanger configurations.
When the outside air enthalpy is below the return air enthalpy and the outside air dry-bulb temperature is below the return air dry-bulb temperature but above the cooling coil control point, use 100 percent outside air.
