Alternative Pathway Modeling for Healthcare Energy Compliance: Stanford Blood Center – Palo Alto, CA
At a Glance
When the installed air-cooled chiller did not qualify under the prescriptive compliance path, Pragmatic PE developed a performance pathway energy model demonstrating that overall building energy performance exceeded the standard design baseline. The modeling approach cleared plan check without equipment replacement and kept the project on schedule.
Project Specifications
Category: Data Centers
Overall Area: 21,342 ft²
Services Provided: Title 24 Energy Modeling
Completion Date: 2026
Owner: Stanford Medicine
Contractor: Accel Air Systems
Project Description
Lead
Stanford Blood Center required energy code compliance for a facility where the installed chiller did not qualify under prescriptive efficiency standards, raising the prospect of equipment replacement and procurement delays. Pragmatic PE developed a performance pathway energy model to demonstrate that overall building energy use exceeded the standard design baseline, making the chiller substitution unnecessary. The approach resolved a compliance gap that would otherwise have disrupted construction schedule and material commitments.
Scope of Work
Pragmatic PE provided energy modeling and compliance coordination for this project.
Energy Modeling
• Evaluated prescriptive versus performance compliance pathways to identify the approach that preserved the installed chiller
• Defined thermal zone boundaries aligned with architectural layout and mechanical system assignments
• Developed the building envelope model coordinating wall assemblies, glazing properties, and air barrier characteristics
• Modeled HVAC systems including variable air volume distribution, chiller plant, and hot water heating
Compliance Coordination
• Developed performance pathway calculations demonstrating overall energy compliance through the alternative method
• Coordinated directly with plan check to resolve efficiency comments and provide supporting technical documentation
Challenges and Solutions
Constraint: Installed chiller efficiency fell below prescriptive thresholds, creating a compliance gap that threatened equipment replacement and project schedule.
Response: Pragmatic PE developed a performance pathway model demonstrating that overall building energy performance exceeded the standard design baseline, allowing existing equipment to remain in place.
Constraint: Plan check raised comments questioning chiller efficiency under the prescriptive method.
Response: Provided performance calculations and technical documentation demonstrating the alternative compliance pathway addressed all plan check concerns without equipment redesign.
Results and Impact
• Project proceeded without chiller replacement, eliminating procurement delays and associated construction disruption.
• Energy model demonstrated building performance above the regulatory baseline, closing the prescriptive compliance gap.
• Plan check comments resolved without redesign, preserving the project schedule through permit approval.
• Performance documentation established a defensible compliance record for the owner and permit authority.