Experiment Test And Simulation Opertimization On The Dry Cavity Floor Radiant Heating System

With the rapid development of industry, the cost and performance of the traditional heating system improved a lot, which becomes a great challenge to floor heating system especially saying of the difficulty and inconvenience in site installing and maintaining. As a new and energy-efficient way of heating, the dry cavity floor radiant heating system use the prefabricated technology, it's convenient for the construction and has been widely used in recent years. Based on the comprehensive research methods such as theory analysis, experimental tests and CFD simulation, the design of the unit model, heat transfer performance, mechanisms analysis, as well as the performance optimization are processed on the operating mode of the dry cavity floor radiant heating system, the process design procedure and technical code is progressed as a result. This will play a guide role in the area of building energy efficiency and indoor thermal comfort.The dry cavity floor Radiant heating system has some characteristics, such as the temperature field is uniform, the energy conservation and so on. First of all, we build a test-room and measure the temperature under different working conditions with the Copper-constantan thermocouple, study on the temperature distribution of floor under the condition of different water temperature and flow. Comparing the temperature distribution of floor installed in three different ways, the result shows that:The surface temperature is uniform on floor installed with a cover layer under it. While the Water supply temperature is 40? and the flow rate is 0.34 m3/h, the temperature in the work place is 20?, the average temperature on the floor surface could be controlled within 24?-26?, that can meet the demand of people's thermal comfort. Secondly, the CFD model of the dry with cavity floor Radiant heating system is built to analysis the changes in the average temperature of floor surface when the return water temperature is changed, compared with the experiment data to prove the validity of the model. Simulate on the floor surface temperature under the influence of floor materials, cover layer materials thermal conductive layer materials and the coil spacing. The result shows that the CFD model and calculation method is feasible; the greater floor material coefficient of thermal conductivity will made the surface temperature distribution more uniform, but the relative humidity is lower; The greater cover layer material coefficient of thermal conductivity will made the floor temperature distribution more uniform, but there will be more Energy dissipation; the longer coil spacing will made a lower floor temperature, the influence of the coil space can't be ignored.A systematically comment about the dry cavity floor Radiant heating system is made, suggestions and measures for system optimization are raised, and how to made the dry cavity floor Radiant heating system unleash the Advantages in energy conservation and environment protection is discussed. Theoretical and experimental studies illustrate that the dry cavity floor Radiant heating system can make a good result for comfort and Have a good development prospects.