Study On Thermal Environment And Thermal Comfort In Winter At Rural Houses With Kang In Severe Cold Region

Kang heating system is commonly used in rural houses in Heilongjiang province in winter,which creates a micro-climate environment with multiple heat sources and uneven radiation.At present,there are few quantitative analysis on the influence of ecological design experience on indoor thermal environment and human thermal comfort.This thesis studies the indoor thermal environment and thermal comfort under the heating mode of Kang,which has important application value for inheriting the heating mode of Kang.Firstly,a field survey was carried out at a village in Helen,Heilongjiang Province.This study is to explore the indoor thermal environment characteristics and residents’ thermal response characteristics of kang heating mode.The results of the test and subjective survey were analyzed statistically to obtain the thermal environment and thermal comfort of the rural houses.The test results of daytime and nighttime were compared.Besides the results of this survey were compared and analyzed with other test results.It has been shown that residents have different heat requirements for their rooms during day and night.The indoor thermal neutral temperature at night is lower than that during the daytime.80% and 90% acceptable operating temperature ranges are lower than that during the daytime.Compared with results five years ago,the indoor thermal environment in rural houses has not changed significantly,but the thermal neutral temperature has been improved significantly.Rural residents are more sensitive to temperature changes,and the acceptable temperature range is also narrower significantly.Residents have a higher demand for the thermal environment.Secondly,continuous testing and analysis of the indoor thermal environment of Kang were carried out.The parameters of Kang were dicussed,such as the surface temperature of Kang,the internal surface temperature of the envelope,the mean radiant temperature and the indoor air temperature.In the extremely uneven thermal environment of Kang at night,the indoor air temperature and the bedding temperature affect the thermal comfort of the residents.The results show that there is a certain temperature fluctuation in the thermal environment of bedding,but the overall comfort is better.The indoor thermal environment of the rural houses in severe cold region is poor.The high surface temperature of Kang creates a good micro-climate environment around the human body,so that it ensure thermal comfort of residents.Thirdly,a physical model was established for the typical rural house.Numerical study of the rural house with Kang was conducted in a typical condition.It was found that the distribution of thermal environment is obviously uneven in the vertical direction.The air temperature at the upper part of the Kang is slightly higher than other parts of the room,and the temperature difference was lower than 1°C.The air temperature at the upper part of the ground was not related to the distance to Kang.The effects of surface temperature of Kang,auxiliary heat source surface temperature,outdoor temperature and enclosure structure on the indoor thermal environment of rural house were studied.The variation law of various influencing factors with indoor temperature and temperature gradient was obtained.