Loop, Equipment Sizing and other Design Data¶

The importance of correct equipment sizing is often ignored in discussions of building simulation methods. The lack of reliable, efficient and flexible sizing calculations can present a serious barrier to the adoption and acceptance of building simulation programs. This section describes the sizing methodology implemented in EnergyPlus. This method includes:

1. A zone by zone heat balance load and air-flow calculation for multiple design days;

2. Significant user control with modest input requirements;

3. Zone, system and plant level calculations of design heating and cooling capacities and fluid flow rates;

4. Modular, component-specific sizing algorithms for each HVAC component.

5. Options for monitoring how the initial sizes operate over multiple design days and then making adjustments and repeating plant level calculations

Contents¶

• Sizing Manager
• HVAC Sizing Simulation Manager
• Zone Design Loads and Air Flow Rates
• System Design Loads and Air Flow Rates
• Plant and Condenser Loop Sizing
• Coincident Plant Sizing using HVAC Sizing Simulation
• Component Sizing
• Zone Outdoor Air Design Data