Research On Capillary Floor Radiant Heating System

With the advancement of science and technology,people's living standards continue to increase.Demand for energy also increases exponentially.In particular,building energy consumption accounts for 40% to 50% of the national energy consumption and is an important area for the construction of ecological civilization.According to related research,it is pointed out that by 2050,the construction sector will have a reduction potential of 74%,which will contribute 50% of the energy savings for carbon emissions in advance.The central heating in the North accounts for 25% of the total building energy consumption.The heating energy consumption of urban buildings in the hot summer and cold winter districts of other non-central heating districts also increased exponentially.At the same time,China has gradually entered an aging society,and people's demand for comfortable and healthy living environment is also increasing.Therefore,for the country's corresponding "energy-saving emission reduction" call,and people's growing health needs.The research and promotion of new healthy and energysaving heating methods have great potential in the field of heating in China.As a new type of heating method,the capillary tube floor radiant heating has a low water supply temperature,and particularly shows obvious energy saving advantages at the heat source side.At present,the study of capillary networks is mainly in the radiant cooling area of the ceiling.There is no much research on radiant heating of capillary floors.More is in the field of practical engineering applications.In this paper,the effects of different heating parameters on the end of capillary heat transfer are studied.Based on this,different indoor models are established and the thermal comfort of different indoor models is compared and analyzed.First,we make reasonable assumptions about the heat transfer process of the floor,establish a two-dimensional ground heat transfer model.The effects of different tube spacings,depth of buried layers,average temperature of return water,floor decoration layer and interior design temperature on the heat transfer performance of Capillary network radiation heating end device were simulated.It is concluded that different heating parameters affect the surface temperature of the floor in different forms.It is mainly reflected in the average surface temperature of the floor surface and the uniformity of the temperature distribution on the floor surface.From the viewpoint of heat transfer performance and protection of capillary networks,marble is most suitable as a floor decorative layer for radiant heating of capillary floors.At the same time,the effect of the ground decoration layer on the ground temperature should be taken into consideration when designing heating.Tube spacing affects the average temperature of the floor surface and also affects the uniformity of the temperature distribution on the floor surface.The average temperature of the returned water has the most direct effect on the average surface temperature of the floor,but it is also directly related to the overall energy consumption of the heating system.Priority should be given to the design of heating.Relative to other parameters,the depth of the buried layer has little effect on the surface temperature of the floor,but it can play a role in heat storage,and can maintain the stability of the indoor temperature to a certain extent.But also consider its impact on floor load.Based on the simulation of floor heat transfer,Airpak was used to simulate the indoor thermal environment of different indoor models during winter heating.It is concluded that the coverage of different indoor environments is different,and the influence of indoor air temperature,air flow,and distribution of PMV increases.For example,the bedroom model 2 in which the bed model is added on the ground is lower than the indoor average temperature of the bedroom model without the floor shelter by about 4° C.,and the living room model with little difference in the ground coverage ratio is comparable to the one without the ground shelter.In the living room model,the average indoor temperature is only reduced by about 1°C due to the larger overall heating area.At the same time,due to the influence of the interior furniture model on the overall air flow in the room,the uniformity of the indoor temperature and PMV distribution has a greater influence on the space area near the furniture.Therefore,in the design of radiant floor heating,the influence of floor furniture on the heating effect should be considered according to different room applications.