Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu 808-0135, Japan.
Int J Environ Res Public Health. 2021 Oct 23;18(21):11147. doi: 10.3390/ijerph182111147.
With the growth in China's economic GDP, energy consumption has increased year by year. The energy demand of rural residential buildings is 223 million tons of standard coal equivalent, accounting for 24% of the national energy demand. Therefore, an energy-saving design for rural residences is necessary. This research took the traditional residences in southern Shaanxi as the research object and combined the cooking methods in southern Shaanxi with solar heating, proposing a sunlight heating system with an additional firewall. The system is composed of a firewall system and a sunlight system. The combination of the two systems prolongs the heating time and makes up for the lack of intermittent heating. The firewall principle involves using the heat generated by cooking through the heat storage and heat release capacity of the wall, and using the principle of heat radiation and convection to increase the indoor temperature. Meanwhile, the principle of the additional sunlight room involves using the external facade of the building to establish an additional sunlight room, by absorbing the heat radiation of the sun and using the principle of heat transfer from the wall. The rapid loss of indoor hot air is avoided, the heating time is prolonged, and part of the heat is retained, thereby improving the heating efficiency. A model was established based on the typical residential model in southern Shaanxi, and the presence or absence of solar radiation on the wall was used as the research variable. Using ANSYS software to simulate the analysis, it is concluded that the firewall-sunlight system can extend the heating time and meet the continuous heating demand, and the heating effect is better than that of the firewall heating system alone. When the walls have solar radiation, the annual heat load reduction rate of the buildings under the new system is 20.21%. When the walls do not have solar radiation, the annual heat load reduction rate of the buildings under the new system is 8.56%.
随着中国经济 GDP 的增长，能源消耗逐年增加。农村住宅的能源需求为 2.23 亿吨标准煤，占全国能源需求的 24%。因此，有必要对农村住宅进行节能设计。本研究以陕南传统住宅为研究对象，结合陕南的烹饪方法和太阳能加热，提出了一种带有附加防火墙的阳光加热系统。该系统由防火墙系统和阳光系统组成。两个系统的结合延长了加热时间，弥补了间歇性加热的不足。防火墙的原理涉及利用通过墙壁的储热和放热能力产生的烹饪热量，以及利用热辐射和对流原理来提高室内温度。同时，附加阳光房的原理涉及利用建筑物的外部立面建立附加阳光房，通过吸收太阳的热辐射并利用墙壁的热传递原理。避免了室内热空气的快速流失，延长了加热时间，并保留了部分热量，从而提高了加热效率。根据陕南典型住宅模型建立了模型，并将墙壁上是否存在太阳辐射作为研究变量。使用 ANSYS 软件进行模拟分析，得出防火墙-阳光系统可以延长加热时间，满足持续加热需求，且加热效果优于单独的防火墙加热系统。当墙壁有太阳辐射时，新系统下建筑物的年热负荷降低率为 20.21%。当墙壁没有太阳辐射时，新系统下建筑物的年热负荷降低率为 8.56%。
