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This article describes the method of calculation for airflow rate and cooling loads of ventilation and air-conditioning systems in commercial kitchens that takes into account full heat gains and moisture loads.
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provides a snapshot of the psychrometric chart for the summer and winter comfort zones. For most of the comfort systems, the recommended indoor temperature and relative humidity are: 1) Summer: 73 to 79°F; The load calculations are usually based at 75ºF dry bulb temperatures & 50% relative humidity
Latent heat load - humidifying and dehumidifying - and required air volume to keep temperature constant at various temperature differences between entering air and room air are indicated in the chart below:
Sensible heat (or dry heat) is directly added to the conditioned space by conduction, convection and radiation. Latent heat gain occurs when moisture is added to the space (e.g., from vapour emitted by the cooking process, equipment and occupants). Space heat gain by radiation is not immediate. Radiant
1. Load calculations 2. Equipment selection and sizing 3. Duct and register sizing. Best Practice for Right- Sizing HVAC
calculating design cooling loads—the heat balance method (HBM) and the radiant time series method (RTSM)—in a thorough, applications-oriented approach that includes extensive step-by-step examples for the RTSM.
Accurate load calculations have a direct impact on energy efficiency, occupant comfort, indoor air quality, and building durability. The load calculation is the first step of the iterative HVAC design procedure, as a full HVAC design involves much more than just the load calculation.
