Study On Heat Storage And Discharge Characteristics Of An Improved Electric Heating Solid Heat Storage Unit

With the continuous advancement of clean energy heating,electric heating solid energy storage heating units have been widely used in the heating industry.The product has the advantages of small floor space,stable heating and strong adjustable heating parameters,but it also has the characteristics of high equipment investment cost and large floor space.According to the characteristics of conventional solid heat storage device,an improved electric heating solid heat storage device with "side storage and side supply" was put forward in cooperation with the enterprise.Firstly,according to the heating load change,the lumped parameter method is used to establish the mathematical model of the heat storage body and fan of the electric heated solid energy storage heating unit,and the numerical simulation is used to study the electric heated solid energy storage heating unit.Secondly,the design and calculation of the heat storage device of the unit was carried out,and the unit was applied to a residential area in Fuyu City,Jilin Province for heating.Temperature sensors and pressure sensors were set up in each part of the unit to record test data and conduct experimental research.Compare and analyze the test data and simulation data to verify the reliability of the model and program.Finally,mathematical model and program are used to study the heat storage and release of the unit under different regulation modes.The results show that the solid heat storage device can reduce the volume of heat storage body.The rate of heat storage and release decreases with the increase of heating area and time.Under different operation modes,the temperature of the regenerator can reach up to 900 K under the heat storage condition and 500 K under the exothermic condition.In the qualitatively regulated operation mode,the temperature of the heat storage body increases gradually with time,but the rate of increase is lower than that of the volumetric regulated operation mode.When the quality intermodulation operation mode is adopted,a higher "quality" water supply temperature can be provided when the outdoor temperature is 0?,the basic flow in the pipe network is maintained,the running frequency of the pump is set at 26.5Hz,and the running frequency of the fan is set at 60%Hz or above.When the outdoor temperature is 0? ?-8?,the fan operation frequency is set as 60%Hz,and the pump operation frequency is set as 70%Hz or above,which can provide "quality" high water supply temperature.When the initial temperature of the heat exchanger is adjusted from 320 K to 316 K,the temperature of water supply on the secondary side will not be able to meet the needs of the heat user.In this case,the running frequency of the fan should be adjusted to above 70%Hz in a timely manner.At the same time,it is found in the study that no matter the unit power is changed or the regulation mode is changed,the heat of the heat storage body cannot be released,which will lead to the reduction of the heat release efficiency of the unit.