Study On The Detection Method Of Heat Storage Performance For Wooden Heating Floor

China is one of the largest producer and consumer of wooden floors used for ground heating system in the world.In recent years,the floor heating industry in China has developed rapidly.However,specific detection methods and devices for thermal storage efficiency of such kind of wooden floor have not been invented and applied by inspection and identification departments concerned.Therefore,it is important and urgent for the floor heating industry to study the principle and method of measuring the thermal storage efficiency of such kind of floor and develop the corresponding devices.In this study,we proposed a new concept of the thermal storage efficiency of wooded floors for ground heating system,explained the detection principle and method,and developed a thermal storage efficiency measuring device with sealed adiabatic double chamber structure.Based on the concept and detection principle of thermal storage efficiency proposed in this study,a device to measure thermal storage efficiency for wooden floor is developed.A test piece heated to T_e°C is placed into a closed adiabatic cavity which initial temperature is T₀°C（T_e>T₀）.The test piece releases heat,and the temperature rises in the space.When the equilibrium state is reached,the heat absorbed by all the media in the space can calculate to get the heat released by the test piece,and the heat storage efficiency of the test piece can be deduced.The design,development and debugging of the insulated dual-chamber system,the control system of cold and heat sources and the action logic control system of the detection device have been completed.And so has been done for the temperature sensor array.The sealed adiabatic space is divided by fan cylinder to establish a gradient space,and a temperature sensor is installed in the geometric center of each fan cylinder,so that a temperature sensor array is formed in the space to realize real-time monitoring.The temperature regulating chamber is designed with cooling and heating components,then an air circulation system installed outside the cavity to jointly adjust the initial detection temperature in the detection chamber.The constructed test piece heating and pushing system realizes the adjustment of the initial temperature of the tested piece and the pushing into the detecting cavity.The main controller,controller A,controller B and sensor array are independently developed in this detector.The photoelectric isolation technology is used to isolate the control end of the main control from input and output,which enhances the anti-interference ability.The controller has been running continuously for two years and has been in stable state.The design of controller A,controller B and sensor array realize the layout of each fan cylinder sensor in the space,temperature collection and temperature data processing.A limiting fuzzy and PID hybrid control model is constructed in this paper.all control operations are completed in a function body,which short the time for reaching the preset initial temperature in the detection cavity,improves the scalability,portability and maintainability of system.The parallel-distributed temperature acquisition method is proposed in this paper,which reduces the acquisition time and improve the synchronization of the system.Repeatability and stability of the thermal storage efficiency of the device are also examined by different experiments.The results show that the testing method and the device are feasible for measuring the thermal storage efficiency of wooden floor for ground heating system.The detection accuracy is±0.1kJ/（s.m3）,and the measuring device is stable and reliable.In this study,the proposed method and the developed device can be used to accurately measure the thermal storage efficiency value of certain kind of wooded floor used for ground heating system.And meanwhile,the temperature field data in the detection chamber can be obtained.This method and the developed measuring device are of great significance to the improvement of correlative industry standards.