Abstract
<title>Abstract</title> <p>To enhance the thermal storage and temperature regulation capacity of building envelopes and reduce indoor temperature fluctuations, sandwich-type phase change gypsum boards were prepared using the sandwich method, and their thermal regulation performance was investigated through heat transfer experiments combined with COMSOL numerical simulation. Using palmitic acid–lauric acid eutectic composite phase change material as the functional layer, phase change gypsum boards with a sandwich thickness of 1 cm and dimensions of 10 × 10 × 3 cm³ were fabricated. The results show that, compared with ordinary gypsum boards, the phase change gypsum boards exhibit significant peak-shaving and delayed heat transfer effects: the indoor-side temperature peak decreased from 32.43°C to 31.17°C, the inner wall-side temperature peak decreased from 39.90°C to 34.91°C, and the thermal lag time was extended by approximately 81 min. The 72 h transient heat transfer simulation results are consistent with the experimental trends. The phase change wall demonstrates lower overall temperature levels, smaller fluctuation amplitudes, more uniform indoor temperature field distribution, and more pronounced suppression of indoor temperature peaks during high-temperature periods. This study demonstrates that sandwich-type phase change gypsum boards can effectively enhance the thermal inertia of building envelopes, improve dynamic thermal performance, and possess promising application potential in the field of building energy conservation.</p>