Abstract
In the field investigation of rural dwellings, it was found that thermal feelings are significantly different with varied envelopes even under the same indoor air temperature, and this paper explores the phenomenon in simulation. Based on building thermal investigations in several villages of North China, a typical energy and environment simulation model for rural residences was developed using DeST, and the hourly parameters of temperature and humidity were used to calculate the adaptive thermal comfort (APMV) of the rooms. The results show that the main reason for the different thermal comfort at the same air temperature is the large difference in the inner surface temperature. By adjusting the insulation thickness of the envelope structure, the relationship between it and the APMV value is obtained. By adjusting the insulation thickness of the enclosure structure and getting the correlation between it and the APMV value, it is obtained that when the heat transfer coefficient of the enclosure structure meets 0.5 W/(m2·K), the indoors can be in thermal comfort. This paper considers that the indoor air temperature cannot represent the APMV to evaluate the indoor thermal comfort, and the APMV value should be used to evaluate the thermal comfort of the renovated building and calculate the corresponding energy saving rate.
Highlights
Introduction published maps and institutional affilAt present, rural construction is a priority for the Chinese government
Zhou et al [11] used Fluent to analyze the effect of Trombe wall on the indoor thermal environment of two rural buildings in Qingdao during summer, and the results showed that Trombe wall can effectively enhance the natural ventilation and improve the thermal comfort of the buildings
The hourly values of indoor air temperature, humidity and internal surface temperature for all rooms were obtained by simulations with DeST software, and the values from the simulations were imported into the CBE [25] thermal comfort calculation tool to obtain the hourly values of room Predicted Mean Vote (PMV)
Summary
Rural construction is a priority for the Chinese government. How to reduce the energy consumption of rural buildings and improve the happiness of farmers is one of the urgent issues that the government needs to solve [1]. Of which rural buildings account for 24%, urban residential buildings and public buildings account for 76% [2]. China’s rural dwellings are mostly built by residents based on preferences and traditional experience rather than construction codes, and 80% have no insulation for building envelopes [3]. Most rural buildings are built at the expense of indoor comfort and energy efficiency to reduce costs, and rural residents have to pay a large sum for additional heating of uncomfortable indoor spaces.
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