A Parametric Investigation on Energy-Saving Effect of Solar Building Based on Double Phase Change Material Layer Wallboard

Abstract

In order to further understand the thermal performance of the double phase change material (PCM) layer wallboard, the wallboard model was established and a comprehensively numerical parametric investigation was carried out. The variation laws of inner wall temperature rise and the heat flux transferred under different phase transition temperatures and thermal conductivities are presented in detail. The main results show that the temperature of the inside wall for case 2 can be reduced by about 1.5 K further compared to that for case 1. About 83% of the heat transferred from the outside is absorbed by the PCM layer in case 2. Reducing the phase transition temperature of the PCM layer can decrease the inside wall temperature to a certain extent in the period of high temperature. The utilization of double PCM layers shows much more performance compared to that of the single PCM layer case, and the temperature of the inside wall can be reduced by 2 K further.

Fabrication and Thermal Properties of Capric Acid/Calcinated Iron Tailings/Carbon Nanotubes Composite as Form-Stable Phase Change Materials for Thermal Energy Storage

“…The melting and cooling curves of CA, CA/CIT PSPCM, and CA/CIT/CNT FSPCM with different mass fraction CNT were shown in Figure 11. From the curves of Figure 11, for a 40 °C increase in temperature (from −12 to 30 °C ) during the melting process, the required time was about 21,18,15,13,12, and 11 min for CA, CA/CIT FSPCM, and CA/CIT/CNT FSPCM, respectively. Compared with the melting time of CA and CA/CIT FSPCM, the melting time was reduced by 47.62% and 38.89%, respectively for CA/CIT/CNT (7 wt.%) whereas it was reduced by 42.86% and 33.33% for CA/CIT/CNT (5 wt.%).…”

“…[3]. Therefore, PCMs are widely researched and applied in many fields, including air-conditioning [4,5], electronic devices [6][7][8][9][10], waste heat recovery [11,12], building energy [13,14], smart textile [15,16], and solar energy storage [17,18]. According to the phase change process, PCMs can be divided into solid-liquid, solid-solid, solid-gas, and liquid-gas categories [19].…”