PCM-enhanced sunspace for energy efficiency and CO2 mitigation in a house in mediterranean climate

In this study, a phase change material (PCM) was integrated to a partition wall between the sunspace and the room of a detached house to reduce energy use. To find the optimal sunspace configuration, various phase transition temperatures, glazing types, and locations of PCM in the partition wall and the presence of active shading were evaluated in terms of energy saving and consumption in Mediterranean climate. Furthermore, economic and CO2 emission analyses were conducted to reveal potential savings for the optimal sunspace-PCM design. The optimal phase transition temperature was found as 27 ? for cooling and 21 ? for heating application, regardless of the location of the PCM in the wall. A glass with low U-value and high SHGC was beneficial in winter, whereas a glass with high U-value and low SHGC was appropriate in sum-mer. Not using an active shading device in summer increased energy consumption, but the negative effect was compensated by effective exploitation of the latent heat content of the PCM. In the yearly energy analysis, the optimal phase transition temperature was 27 C and the PCM was located at the front of the partition wall. A glazing type with high SHGC and high U-value (SG-1), or low SHGC and low U-value (TG-2) was recommended to minimize the annual energy demand. A reduction in CO2 emissions of 98 kg was achieved with the optimal configuration compared to a case without sunspace.

Automated summary

In this study, the integration of a phase change material (PCM) into a partition wall between a sunspace and a room in a detached house was investigated for energy reduction. The optimal sunspace configuration was determined through evaluating various factors such as phase transition temperatures, glazing types, PCM locations, and the presence of active shading. Economic and CO2 emission analyses were also conducted to measure potential savings and benefits. The results showed that the optimal phase transition temperatures were 27 ℃ for cooling and 21 ℃ for heating applications, regardless of the PCM location in the wall. The choice of glass type varied depending on the season, with low U-value and high SHGC glass recommended for winter, and high U-value and low SHGC glass preferred for summer. The use of active shading in summer increased energy consumption, but this negative effect was offset by the effective utilization of the latent heat content of the PCM. The yearly energy analysis revealed that locating the PCM at the front of the partition wall and using a glazing type with high SHGC and high U-value or low SHGC and low U-value could minimize the annual energy demand. Compared to a case without sunspace, the optimal configuration achieved a reduction in CO2 emissions of 98 kg.