tailieunhanh - Energy Efficiency Part 9

Tham khảo tài liệu 'energy efficiency part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Low-energy buildings - scientific trends and developments 113 obtained using Energy10 and . The results from these two models gave similar results. The study concludes that four components were clearly economically under given constraints high-performance windows compact fluorescent lighting well insulated roofs and AC units with water-cooled condensers. If financial support was included PV tiles were also considered to have good financial return. Thermal mass walls were found to be too costly. Walls are in focus in Zhu 2009b where a detailed energy-saving analysis of a high thermal mass wall is presented. This is demonstrated in an actual construction project and compared to a conventional wall. It is shown that for this wall construction the heating use in the building was much lower but the load slightly higher. According to the study this is due to the effect that more heat is stored during the day than can be returned during the night increasing the cooling demand. The simulation software used is Energy10 and the experimental part of the study was carried out in Las Vegas. In Heim et al. 2010 the authors investigate isothermal storage of solar energy in building construction with focus on passive houses. A storage system with phase change materials that absorbs heat during the hot period and releases heat during the cold period is analyzed. The material behaviour is studied using numerical techniques. These methods are then implemented in a general building simulation tool ESP-r. The paper investigates the effect of a PCM wall and the influence on internal surface temperature. The case is compared with a conventional wall without the PCM material. Both diurnal as well as seasonal latent heat storage is studied. The authors conclude that isothermal heat storage may improve thermal conditions on internal surfaces but emphasize that the effect of the latent heat storage will depend on its structure phase change temperature range and total latent heat of

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