Research On Characteristics Of Heat Transfer Between Adjacent Chambers In Partial Space Heating Mode In Hot Summer And Cold Winter Area

The hot summer and cold winter area contains 16 provinces,municipalities and autonomous regions.The average outdoor temperature in the coldest months in winter ranges from 0-10°C,thus the indoor thermal environment in winter is of poor quality.Unlike the centralized heating mode in cold regions,the heating mode in the region is space and time uncertained,which means the operation mode is of partial space and part of the time.Users in this area tend to naturally ventilate.Therefore,with the existing envelope structure in the area,whether the effect of heat transfer between the adjacent rooms on the heating effect should be included in the design and operation considerations,whether it is necessary to optimize the internal envolope structure in order to reduce the energy consumption of the adjacent room heat transfer,and whether the diversified heating methods have the same effect on the adjacent chamber heat transfer? These issues are still worth studying.In this paper,firstly,experiments were conducted with different heating end forms under the condition of adjacent rooms heating and not heating,respectively,and then the effects of different heating end heating modes on the indoor thermal environment and heat consumption characteristics were compared.Secondly,this paper focused on the factors affecting the internal wall heat transfer characteristics and analyzed from three aspects: the type and structure of the internal wall,the type of the heating terminal,and the number of non-heating adjacent rooms.This study found that whether the adjacent room is heating directly affects the temperature of the inner surface of the internal wall and total heat consumption,compared to the adjacent rooms heating,the average temperature of the innerwall surface decreases 1.436 °C when adjacent rooms were not heating.And the total heat consumption of the inner envelope structure in the heating 12 hours is approximately 76.04% when adjacent rooms are not heating.The total heat consumption of the envelope structure increases as the number of non-heating adjacent rooms increases,and the maximum value of the total heat consumption of the envelope structure is relatively 8.633 MJ more than the minimum value,of which the increase rate is 20.75%.The maximum total heat consumption of the inner envelope structure is relatively 10.634 MJ more than the minimum value,of which the increase rate is 38.63%.Comparing to the condition that the adjacent rooms are heated,the average room temperature after heating 12 hours is approximately 1.621°C less when adjacent rooms are heated.The degree of influence by the heating of the adjacent room on the heating room under different radiant heating methods is: wall heating(coil)> ceiling heating(capillary ceiling installation)> floor heating(capillary & wood floor).In view of the factors that affect the heat transfer characteristics of interior walls under heating conditions,this paper has found that the characteristics of the thermal performance of interior walls in the hot summer and cold winter regions.The inner wall with smaller inner thickness within 120mm-240 mm,the better the thermal performance.The inner wall with the same thickness and structure,different types of inner walls,the smaller the heat transfer coefficient and the smaller the heat storage coefficient,the better the thermal performance.That is,the lightweight interior wall is superior to the heavy interior wall.The same kind and the same thickness,the closer the insulation layer is to the side wall surface of the room,the better the thermal performance.The advantage of interior wall with the insulation layer out is not obvious compared to the non-insulation interior wall.Furthermore,this paper compared the performance of heating methods: floor radiant heating and fan-coil convection heating,from the perspectives of wall temperature,heat flux,wall heat loss,wall heat storage ratio,and total heat supply of the room.Results show that in most of the time the temperature of inwall inner surface of the fancoil convection heating is higher than that of the floor radiant heating.The peak time of the heat flow of wall is about 1.5 hours under the convection heating,and the radiant heating is about 3.5h(this time is related to heating interval time,floor surface temperature and heating rate,supply air temperature,air supply speed and other factors.Convection heating is lower than radiant heating generally).The wall heat consumption of convection heating is higher than the radiant heating.Affected by the floor heat storage,the total heating energy of radiant heating is more than that of convection heating.The wall heat storage of continuous heating is related to the end heating mode in the initial stage of heating(about 0-5 hours),and it is unrelated to the heating end mode during the later heating period(after 5 hours).