Indian Phase-Change Material (PCM) for Building + TES — ASTM C1850 + EN 16235 + IEA SHC Task 42 + ASHRAE
Indian PCM building envelope + TES — paraffin + salt-hydrate + bio-based PCM at ₹1500-12000/m² + saves 12-50 % peak HVAC load shifted. ASTM C1850 + EN 16235 + IEA SHC Task 42 + RAL-GZ 896 + ASHRAE Handbook Ch 17 govern. India 2030 market potential ₹1485 Cr. Three failures: wrong melting-point (22-24°C never freezes in Indian summer), PCM encapsulation 8-12 % yearly degradation in plastic, PCM + active HVAC not coordinated via BMS for night-flush.
Indian phase-change material (PCM) framework
India PCM (Phase-Change Material) — paraffin + salt-hydrate + bio-based PCM embedded in building envelope. Absorbs heat during phase transition (solid ↔ liquid) at design temperature. Players — Rubitherm + PCM Energy + Microtek Encapsulation + IISc Bangalore R&D. Standards stack — ASTM C1850 (PCM enthalpy) + EN 16235 (PCM thermal-comfort) + IEA SHC Task 42 + RAL-GZ 896 + ASHRAE Handbook 2024 Ch 17 + WBCSD Bioeconomy + India IIT Bombay PCM Programme.
Indian residential + commercial PCM MEP scope — 5000 m² building
| PCM type | Melting temp (°C) | Enthalpy (kJ/kg) | Application | Capex (₹/m²) |
|---|---|---|---|---|
| Paraffin RT22 | 22 | 165 | Indoor air comfort | 1500 |
| Paraffin RT26 | 26 | 190 | Indoor walls + ceiling | 1500 |
| Salt-hydrate SP25 | 25 | 210 | High-load capacity (high enthalpy) | 2500 |
| Bio-based PCM (RT28HC) | 28 | 220 | Hot climate India + sustainable | 3500 |
| Eutectic salt-hydrate (cold) | 7-15 | 180 | Cold-storage TES | 2200 |
| Encapsulated PCM (microcapsule) | 22-28 | 150 | Embedded in drywall | 3500 |
| PCM panel (macro-encapsulation) | — | 180 | Roof / facade application | 5500 |
| PCM-enhanced concrete | — | 120 | Slab thermal mass | 4500 |
| PCM in cool-roof | — | — | Roof | 3500 |
| PCM in HVAC system (TES tank) | 22-28 / -3 | — | Cold storage | 12000 (system) |
Three Indian PCM MEP failures
- Wrong melting-point for Indian climate — Indian summer indoor 28-32°C; PCM melting at 22-24°C never freezes back at night → permanent liquid → no cycling. Specify PCM at 28-30°C for Indian context per IEA SHC Task 42.
- PCM encapsulation degradation — paraffin PCM in plastic capsule degrades 8-12 % per year. Specify metallic or ceramic encapsulation + 25-yr-rated per RAL-GZ 896.
- PCM + active HVAC coordination missing — PCM passive + active HVAC must coordinate. Without smart control PCM holds heat too long. Specify BMS control + night-cooling night-flush per ASHRAE Handbook Ch 17.
- ASTM C1850:2024 — PCM Enthalpy Measurement.
- EN 16235:2014 — PCM Thermal Comfort.
- IEA SHC Task 42 — Compact Thermal Energy Storage.
- RAL-GZ 896 — PCM Quality Assurance.
- ASHRAE Handbook HVAC Systems 2024 Ch 17 + Ch 51.
- WBCSD Bioeconomy + Bio-PCM 2024.
- IIT Bombay PCM Programme + IISc Bangalore 2024.
- ISO 17832 + ISO 14000 series.