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.
Highlights
At present, energy issues have become the top priority of all countries
The envelope is an important channel for heat exchange inside and outside the building, generally, it can be effectively predicted by computer simulation methods (Mirante et al, 2014), such as Designer’s Simulation Toolkit (DeST) software (Qian et al, 2011)
The thermal insulation layer of the external wall internal thermal insulation is placed on the inside of the external wall, and it can be used for intermittent heating of the room because of its fast heating and cooling speed (Cheng et al, 2017)
Summary
Energy issues have become the top priority of all countries. Building energy consumption in all countries accounts for a high proportion of national energy consumption, which is about 33% (Liu et al, 2019a). It is urgent to save building energy consumption, especially in a HSCW (hot summer and cold winter) zone, which has a significant impact on building (Tan et al, 2020). 11 ultra-low energy consumption buildings in the HSCW zone were investigated (Qun et al, 2019), and the thermal design parameters of their envelopes were sorted out to refine the common range of design parameters of the envelope, including heat transfer coefficient (K), the indoor thermal disturbance, the plane area of the building, window-to-wall ratio, etc. The influence of the change of envelope performance on the energy demand of low-density buildings in HSCW zone was evaluated (Yang and Yiqun, 2020). The impact of the envelope on the Energy Exploration & Exploitation 39(3)
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