Thermal Comfort Investigation Of Capillary Network Air Conditioning Radiant Heating In Hot Summer And Cold Winter Zone

With the rapid development of modern society,people's pursuit of life is constantly improving.People's requirements for the thermal environment of life are no longer the balance between heat and cold,and comfort has been put to a new height.Traditional air conditioners have gradually exposed many problems.The temperature and humidity cannot be controlled independently,and the air blow feeling is obviously easy to cause people's discomfort,loud noise,and mildew on the surface of the fan coil.The air conditioning of the all-air system needs to occupy a large area,and the energy is often wasted when the air volume is delivered.In order to replace the traditional air conditioner and improve the indoor comfort,capillary net radiant air conditioning came into being in this context.The essence of capillary network radiant air conditioning is independent control of temperature and humidity.The temperature and humidity are controlled separately by two sets of systems.The capillary network radiation system is responsible for taking away a large amount of heat and cold load in the room,so that the indoor temperature is in a suitable thermal environment of the human body.The fresh air system is responsible for taking away the wet load in the room and the cold and heat load that the radiant air conditioner does not handle,and undertakes the task of ensuring the quality of the indoor fresh air.Capillary radiant air conditioning has advantages in many aspects,so its indoor thermal environment is also different.The evaluation criteria for comfort in China are generally based on the international standards ASHRAE 55-2013 and ISO 7730.However,in the hot summer and cold winter regions of China,the indoor comfort level with the capillary network as the end,whether the above international standards are still applicable,it is necessary to establish an experimental platform for demonstration.In this paper,the radiant air conditioner with capillary network as the end is introduced systematically.The advantages and disadvantages of capillary air radiant air conditioning are expounded.The influencing factors affecting the indoor thermal environment of capillary air radiant air conditioning are analyzed.Then use the CFD simulation method to study the indoor thermal environment under different laying methods and joint laying of capillary grids.The simulation is divided into floor radiation model,wall radiation model,ceiling radiation model,floor + wall radiationmodel,wall + ceiling radiation model and floor + ceiling radiation model.The above conditions are modeled respectively to obtain the temperature field cloud map under various working conditions.,velocity field cloud map,PMV-PPD map,particle trajectory map,and cloud map of each section.According to the analytical analysis obtained from the modeling,the optimal laying method of the indoor capillary grid in the hot summer and cold winter regions is analyzed.Then build an experimental platform and use experimental methods to demonstrate the conclusions of the simulation.The experiment is also composed of six forms,real-time detection of indoor thermal environment indicators such as temperature,humidity and air flow rate under different working conditions in indoors.The experimentally measured data is aggregated and analyzed,and the conclusions of the simulation are compared to verify its authenticity.Finally,the questionnaire survey method is used to objectively record the actual feelings of the tested population.Exploring the linear relationship between indoor parameters and external climate parameters and the human thermal adaptability model under the above optimal laying conditions.This paper believes that people in summer hot and cold winter wear more clothing in winter,the average thermal resistance is1.43 clo;the hot and neutral temperature in winter hot and cold winter is 19.51 ° C,people in this area are sensitive to the thermal sensation of temperature,winter The temperature range that satisfies 80% of people's comfortable temperature requirements is 18.89?-21.38?;the indoor thermal environment with capillary network as the end can maintain the indoor thermal environment at 19?-22?,basically in comfortable working conditions.