This project integrates PCM packs inside a refrigerator’s walls/evaporator zone. When the compressor runs, the PCM freezes (stores “cold”). During off‑cycle or power cuts, the PCM melts slowly, releasing latent heat and maintaining internal temperature without frequent compressor starts. Result: reduced energy consumption, fewer on/off cycles, better temperature stability, and extended safe time during outages.

How it Works (brief)

1. Compressor cools the evaporator; PCM (with melting point ~2–8 °C) solidifies and stores latent heat.
2. When the thermostat cuts off or power fails, PCM melts, absorbing heat ingress and keeping the cabinet near setpoint.
3. Fewer compressor restarts → lower kWh, longer compressor life.

Parts Used

1. Refrigeration Unit: compressor, condenser, capillary/expansion device, evaporator
2. PCM Packs/Modules (food‑safe, melt point 2–8 °C)
3. PCM Enclosures (HDPE/aluminum sleeves/pouches)
4. Temperature Sensors (cabinet + PCM surface)
5. Thermostat / Microcontroller (optional PID or smart control)
6. Insulation Materials (PUF/EPS) & sealing tapes
7. Data Logger / Wattmeter (for performance testing)