Optimization method for prefabricated restroom envelope energy saving characteristics in hot summer and cold winter zone

Abstract

In order to reduce the restroom envelope energy consumption, one optimization method on basis of analyzing the influence of heat transfer coefficient on the performance of a prefabricated restroom envelope in a hot summer and cold winter zone was proposed. An energy-consuming model of prefabricated restroom in Nanjing is initially built based on Designer's Simulation Toolkit software. Subsequently, the effect of external walls, rooftops, external windows with various thermal characteristics on the building envelope is analyzed respectively. Simultaneously, a method that only changes the heat transfer coefficient of the prefabricated restroom envelope while keeping other parameters unchanged is adopted. Results show that, for a prefabricated restroom, the optimal range of heat transfer coefficient of the external wall, rooftop, and external window in hot summer and cold winter zone is 0.199∼0.22, 0.16∼0.19, and 3.0∼3.1 W/(m2·K), respectively. When the window-to-wall ratio is less than 0.2, the priority of the wall heat transfer coefficient on building energy consumption is higher than that of the rooftop heat transfer coefficient, simultaneously, the rooftop heat transfer coefficient has priority higher than window heat transfer coefficient. Thus, it is of great significance to optimize the design of the prefabricated restroom envelope in a hot summer and cold winter zone, which provides relative reference for thermal performance improvement of prefabricated restrooms.

Benefitting from Solar Energy Due to Different Emissivity Levels of Multiple Glass Windows for Buildings

“…In the study, argon gas, krypton and air were used as insulators between the windows, and various singleglazed and double-glazed windows were examined. Zhang L et al [39] proposed an optimization method to analyze the effect of the heat transfer coefficient on the performance of the prefabricated room envelope for hot summer and cold winter climates, in order to reduce the energy consumption for the sample room. Used in Designer's Simulation Toolkit software for an energy-consuming prefab room in Nanjing (China).…”