61-IFB25033 Appendix F - LCCA.pdf

This is a Life Cycle Cost Analysis (LCCA) appendix for an Invitation for Bids issued by North Carolina Central University for an early procurement rotary-screw compressor water chiller as part of the Walker Complex HVAC and BAS Renovation project. The procurement requires one 250-ton chiller that meets specified design documents. The chiller must be delivered to the site between February 15, 2027 and March 1, 2027, with delivery date identified as a critical consideration. Vendors are permitted to submit multiple options in their bids to facilitate meeting the delivery timeline, and minor deviations from technical specifications may be considered to improve delivery dates, though major deviations will not be accepted. The Engineer of Record will evaluate submissions, and vendors are encouraged to submit reasonable alternatives.

The LCCA methodology requires bidders to submit initial cost plus estimated energy usage over an economic life of 23 years at an electricity rate of $0.079 per kilowatt-hour. Chiller efficiency is evaluated based on four load conditions: 100% load at 300 tons for 2,500 hours annually, 75% load at 225 tons for 4,000 hours, 50% load at 150 tons for 1,260 hours, and 25% load at 75 tons for 1,000 hours. Bid documentation must include input power (kW/ton) calculations at each condition with associated total energy costs, flow rates, temperatures, pressure drops, sound data, physical dimensions, weight, and refrigerant charge specifications. Selections exceeding maximum pressure drop requirements will be disqualified, and no energy credit will be awarded for pressure drop reductions. Following owner selection based on equal criteria, the successful manufacturer may propose modifications outside bid constraints to enhance overall plant energy performance.