Study on the Passive Heating System of a Heated Cooking Wall in Dwellings: A Case Study of Traditional Dwellings in Southern Shaanxi, China

Abstract

In China, research on winter heating and energy saving for residential buildings mainly focuses on urban residences rather than rural ones. According to the 2018 China Building Energy Consumption Research Report, rural residential buildings emit about 423 million tons of carbon, accounting for 21% of the country’s total carbon emissions. According to the research on China’s greenhouse gas inventory, the main sources of carbon emissions in rural areas are from cooking and the burning of fuelwood and biomass for heating in winter. In this study, the southern Shaanxi area, which is hot in summer and cold in winter, was selected as the research site, and a fire wall system was planned that combines cooking and heating facilities in residential buildings. The system uses the heat generated by cooking and the heat storage capacity of the wall, as well as the principle of thermal radiation and heat convection, to increase the indoor temperature. The advantage is that the hot air generated is mainly concentrated in the inside of the wall, which reduces the direct contact with the cold outdoor air and avoids excess heat loss. In this study, in addition to considering the influence of the cooking fire wall system on the indoor temperature, the difference in the outer wall with or without solar thermal radiation was also considered. The research results show that the use of a cooking fire wall heating system reduces the annual heat load of the building to 440.8318 KW·h, which is a reduction rate of 7.91%. When there is solar radiation on the outer wall, the annual thermal load of the building is reduced by 1104.723 kW·h, and the reduction rate is 19.84%.

Study on Passive Heating Involving Firewalls with an Additional Sunlight Room in Rural Residential Buildings

“…Ordinary heating refers to keeping the body of the residential house unchanged, and only relying on solar energy to heat the interior. The new system is the firewall system with an additional sunlight room mentioned in a previous article [ 62 ], which refers to the renovation of residential buildings, adding firewalls and additional sunlight rooms. Heating the interior using the heat generated by the firewall from cooking while relying on absorption of additional sunlight and storing and converting solar energy, so as to heat the interior more effectively.…”

“…In previous studies, a new passive heating design strategy for rural residential buildings has been proposed, combining the characteristics of cooking and heating methods, and studying the basic working principles of firewall heating and energy saving [ 62 ]. Based on this principle, this research added new heating equipment, combined the cooking firewall system with solar energy technology, and comprehensively analyzed the heating time, effect, and energy saving.…”