Indian Phase-Change Material (PCM) for Building + TES — ASTM C1850 + EN 16235 + IEA SHC Task 42 + ASHRAE

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MEP Consultant · Thermal Storage · 12 May 2026

Indian Phase-Change Material (PCM) for Building + TES — ASTM C1850 + EN 16235 + IEA SHC Task 42 + ASHRAE

Published: 05 May 2026Updated: 12 May 2026Original figures: 9

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)

PCM cooling load shift (% peak HVAC load shifted to off-peak)No PCM (baseline)0% shiftPCM in wall (paraffin)12% shiftPCM in ceiling18% shiftPCM + slab thermal mass25% shiftPCM in HVAC TES tank35% shiftPCM hybrid (envelope + TES)50% shiftFuture advanced65% shiftIndian PCM market potential (₹ Cr) by application 2030Residential air comfort220CrCommercial office485CrCold-storage TES385CrIndustrial process185CrRefrigerated transport125CrEV thermal management85CrTotal India 20301485Cr

Three Indian PCM MEP failures

  1. 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.
  2. 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.
  3. 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.
// References + Standards
  1. ASTM C1850:2024 — PCM Enthalpy Measurement.
  2. EN 16235:2014 — PCM Thermal Comfort.
  3. IEA SHC Task 42 — Compact Thermal Energy Storage.
  4. RAL-GZ 896 — PCM Quality Assurance.
  5. ASHRAE Handbook HVAC Systems 2024 Ch 17 + Ch 51.
  6. WBCSD Bioeconomy + Bio-PCM 2024.
  7. IIT Bombay PCM Programme + IISc Bangalore 2024.
  8. ISO 17832 + ISO 14000 series.
By MEPVAULT Editorial Team — A team of practising MEP consultants based in India. ISHRAE-affiliated; FSAI-aligned.

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