Presentation Title:
Evaluating Hybrid VRF + Gas DOAS Systems Across Climate Zones
Track C: Decarbonization and Electrification Strategies
Session C1: Building Decarbonization
Day 1 - March 11, 2026Â 3:00 pm
Speaker(s):
Abstract:
| This work evaluates hybrid HVAC configurations pairing electric variable refrigerant flow (VRF) with natural gas or propane-based dedicated outdoor air systems (DOAS), benchmarked against fully electric VRF systems. Using EnergyPlus models calibrated with field data, simulations across ASHRAE climate zones revealed significant reductions in electricity use (40–50% in cold climates), annual CO₂e emissions (35–45%), and operating costs, particularly where heating loads are large and grid carbon intensity is high. In warmer climates, benefits were limited or negligible due to low heating demand. Natural gas proved more cost-effective than propane, though both reduced grid reliance and improved system resilience. These results underscore the role of hybrid VRF + DOAS as a scalable pathway for energy efficiency and emissions reduction in offices, schools, and healthcare facilities, aligning with decarbonization goals while supporting flexible fuel strategies. |