ToolFusion
📋 Case Study

Microgrid LFP Installation in Puerto Rico Hospital

Space-constrained indoor location; strict smoke toxicity limits (ASTM E662) and zero water discharge into occupied floors

🏗️ Project Overview

1.2 MWh lithium iron phosphate (LFP) backup system inside hospital mechanical penthouse

🎯 Challenge

Space-constrained indoor location; strict smoke toxicity limits (ASTM E662) and zero water discharge into occupied floors

🔧 Design Approach

Sealed rack enclosures with active CO₂ suppression, dual-wavelength optical smoke detection, hydrogen sensors with auto-ventilation interlock

📐 Design Diagram

Puerto Rico Hospital — Microgrid LFP Room Sealed LFP Rack (IP65, NEMA 12) CO₂ Discharge\nQ = 2.8 kg/min t_hold = 18 min Optical Smoke\nDetector (2λ) H₂ Sensor → Auto-Vent Interlock ASTM E662 Ds = log₁₀[(1−T)/T] = 2.1 @ t = 4 min Constraints • Space-limited indoor • Zero water discharge Legend Enclosure CO₂ System Smoke Detection H₂ / Hazard 160 cm

AI-generated project design illustration

📐 Key Calculations

CO₂ Hold Time

t_hold = V_room × 0.4 / Q_discharge
Result: 18 min
Meets NFPA 2001 minimum retention

Toxicity Index (ASTM E662)

Ds = log₁₀[(1−T)/T] at 4 min
Result: Ds = 2.1
Well below hospital limit of Ds ≤ 3.5

📊 Results

Approved by PR State Fire Marshal and CMS Joint Commission; no false alarms in 2+ years of operation

💡 Lessons Learned

  • •LFP’s lower heat release rate enabled smaller suppression volumes—but hydrogen generation remained critical
  • •Optical smoke detectors required recalibration after HVAC filter changes

✅ Key Takeaways

  • 1LFP’s lower heat release rate enabled smaller suppression volumes—but hydrogen generation remained critical
  • 2Optical smoke detectors required recalibration after HVAC filter changes