Capillary Radiation And Fresh Air Work Together For The Study Of Residential Heating

Capillary radiant air conditioning system have become more and more widely used in residential houses in recent years due to their comfort and energy saving.At present,in the hot summer and cold winter regions,research on this field mostly focuses on the problems of anti-condensation in summer,and there are few studies on winter research,especially the combined work of capillary radiation and outdoor air in the winter environment.With the increasing demand for central heating in southern China,the system is expected to be more widely used in the winter environment in hot summer and cold winter regions.For the district central heating environment,how to design the system,such as the accurate calculation of the load,capillary radiation and outdoor air cooperation,need further research.This paper takes a practical application project in the hot summer and cold winter area as the research background,and studies the combined use of capillary ceiling radiation and outdoor air system for heating in residential buildings.According to the capillary laying situation in the experimental room,the scale model of heat exchange distribution of the capillary ceiling radiation panel is established.The distribution ratio of heat exchange capacity between heating room or non-heating room and capillary layer was calculated by measuring various parameters of indoor thermal environment,and verify the model created.When the capillary ceiling radiant air conditioning system is running,the capillary water supply temperature is kept constant,the heat exchange capacity of the capillary layer and the heating side or the non-heating side is increased,the heat transfer amount distribution ratio of the capillary ceiling radiation panel is rapidly increased,and then tends to be stable;when the indoor temperature reaches the control system setting,and the heat transfer amount distribution ratio of the capillary ceiling radiation panel is also gradually reduced.The model can evaluate the thermal performance of the enclosure in which the capillary is located,and provide an effective theoretical basis for the winter load calculation of the building using the capillary ceiling radiant air conditioning system.It is known to study the distribution of indoor heat transfer in the building by using experimental methods.As the number of heating users increases,the indoor temperature difference between users gradually decreases;heat transfer between households has a great impact on the heating of the room.The upper and lower heating households through the heat transfer of the slab have a greater impact on the middle non-heating households.The left and right heating households that transfer heat through the household wall in the same layer have less impact on the middle non-heating households.The study believes that the water supply temperature of the heating user's capillary can be set according to the heating condition of the adjacent user to reduce the energy consumption of the air conditioning system.The temperature distribution of different vertical gradients in the user room is relatively uniform,and the use of capillary ceiling radiation and outdoor air combined heating in the room has the disadvantage of uneven temperature distribution.According to the dynamic experimental study of the capillary ceiling radiant air conditioning system,the user can take intermittent operation to save the cost of running the system.The CFD simulation method is used to analyze the operating conditions of different outdoor air supply temperatures and speeds under capillary radiation and outdoor air combined heating.When the outdoor air supply speed can meet the indoor air exchange frequency requirement,the temperature of capillary ceiling radiation panel is relatively low,the outdoor air temperature is relatively high,and the air temperature distribution of different heights of the human body active area in the air supply room is relatively uniform,which can meet the comfort of the human body.When the temperature of the capillary ceiling radiation panel increases and the air supply temperature decreases,the greater the temperature difference between capillary ceiling radiation panel and outdoor air,the greater the temperature difference in the vertical direction of the human active area,the comfort of the human body is reduced indoors.The temperature difference in the vertical direction of the human active area is large,and the comfort of the human body in the room is poor.When the temperature of capillary ceiling radiation panel is 25 degrees Celsius and outdoor air supply temperature is 21 degrees Celsius,the wind speed is from 0.2m/s to 0.4m/s,the indoor air exchange frequency is 1?2 times/h,which can meet the indoor air ventilation.The temperature and velocity distribution of the active area of the human body are within a good range of comfort.The research in this paper can provide useful reference for the design and construction of residential buildings with capillary radiant heating in hot summer and cold winter regions.