Which statement best describes 'lead/lag sequencing' in a multi-chiller plant?

Which statement best describes 'lead/lag sequencing' in a multi-chiller plant?

• A. Running all chillers at the same load regardless of demand
• B. Sequencing based on the oldest chiller first and never shut off
• C. Always using the largest chiller first
• D. Starting and staging chillers in a preferred order to match demand and energy efficiency, with a defined lead chiller and lagging backups

Answer: (D)