Abstract
In this study, focusing on hot zones, several different PCMs are added to the wall with the intention of forecasting the energy demand (ED) from a green building. A new PID control was approved to adjust the interior temperature compatible with PCM melting range. Preliminary calculations were performed numerically at a thickness of 1 cm, and it was found that in winter gas consumption dropped by 3.9%. This amount was estimated by 1.9% for summer, and 3.1% for the whole year. To study the PCM thickness effects on ED, it is observed that when the thickness of PCM18C is doubled, annual energy saving intensified by 54% (more energy saving by 1483 kWh). To study the PCM type effects on ED, the same PCMs with different melting point of 21–23 (for PCM21C), 22–24 (for PCM23C), 24–26 (for PCM25C) and 28–30 (for PCM29C) were chosen. In summer, electricity demand declined by 11% (best conditions under the case of PCM25C). Unexpectedly, it was observed that PCM29C intensified electricity demand by 5.4%. Finally, with 2 cm thickness it was observed PCM18C reduced ED by 4.8% (PCM18C), 5.3% (PCM21C), 6.3% (PCM23C), 6.9% (PCM25C), and only 0.5% for PCM29C.