hvac-design

# HVAC System Design Skill ## Purpose The HVAC System Design skill provides comprehensive capabilities for heating, ventilation, and air conditioning system design according to ASHRAE standards, enabling systematic load calculations, equipment selection, ductwork design, and energy efficiency analysis for commercial and industrial buildings. ## Capabilities - Heating and cooling load calculations - Psychrometric analysis and chart calculations - Equipment selection (AHU, chillers, boilers) - Duct and piping system sizing - Energy efficiency analysis (ASHRAE 90.1) - Indoor air quality assessment (ASHRAE 62.1) - System simulation and optimization - Control system specification ## Usage Guidelines ### Load Calculations #### Cooling Load Components 1. **External Loads** - Solar radiation through windows (SHGC consideration) - Conduction through envelope (walls, roof, floor) - Infiltration and ventilation air 2. **Internal Loads** - People: 250 Btu/h sensible, 200 Btu/h latent (typical office) - Lighting: Use installed wattage with diversity - Equipment: Plug loads with usage factors 3. **Calculation Methods** - CLTD/CLF method: Manual calculations - RTS (Radiant Time Series): More accurate - Heat Balance Method: Full simulation #### Heating Load 1. **Design Conditions** - Use ASHRAE 99.6% or 99% design temperature - No solar credit for heating design - Full infiltration at design conditions 2. **Load Components** - Envelope cond...