Analysis Of Hydraulic Disequilib-Rium Condition Of Heating Pipe Net-Work And Test Of Return Temperature Balance Method

The problem of hydraulic disequilibrium has always been one of the main causes of excessive heating energy consumption.Most of today's central heating systems have hydraulic disequilibriums.Therefore,solving the problem of hydraulic disequilibrium problem is the primary goal of saving heating energy.Hydraulic balance technology is the most effective way to solve the hydraulic imbalance phenomenon,and the economic and social benefits are very significant.In this paper,the horizontal disequilibrium phenomenon is studied firstly.The mathematical models of hydraulic conditions and thermal conditions under horizontal disequilibrium are constructed.Based on this,the factors affecting hydraulic balance are calculated and analyzed,including the heating radius.The influence on the hydraulic conditions of the pipe network,the influence of the heating radius on the thermal working conditions,the influence of the pipe network regulation mode on the thermal working conditions and the influence of the outdoor calculated temperature on the thermal working conditions.Then,the return temperature method is used to modify and debug the case of the level imbalance problem.The main operation is to apply the temperature sensor and the electric control valve to transfer the return temperature to the cloud in real time,and adjust the valve based on the difference between the return temperature and the total return temperature.After the transformation and commissioning,the parameters of the pipe network were measured and compared with the previous parameters to obtain the energy saving effect of the pipe network.During the transformation and debugging process,it was found that the vertical imbalance of the system is more serious.In order to solve this problem,this paper establishes a mathematical model of vertical imbalance,compares the parameters of the top and bottom of the same building,and analyzes the effect of the circulating pressure pump head and the cyclic flow on the vertical offset.In addition,during the adjustment process,it was found that the return temperature of most buildings could not be the same as the total return temperature.The cause analysis of this phenomenon was carried out,and the two factors of the habits of the hot users and the surplus of the heat dissipating equipment were studied,and the mathematical model was established and the specific analysis was carried out.After the above research,it is concluded that the increase of the heating ra-dius will aggravate the horizontal disequilibrium phenomenon.The application of the quality adjustment mode can better mitigate the horizontal disequilibrium phenomenon and the increase of the outdoor calculation temperature compared with the application of the staged change flow adjustment mode.The conclusion of the horizontal disequilibrium phenomenon.After the application of the return temperature method to the heating system,the hydraulic conditions of the system have been improved to some extent.For vertical misalignment,the larger the indenter of the circulating water pump,the larger the circulating flow rate,and the smaller the influence of the vertical offset on the system.Based on the above analysis,the adjustment method for relieving the vertical offset is found.The difference of the return temperature of the building increases with the increase of the number of air exchanges by the heat user.For the surplus of the heat dissipation equipment,the return temperature decreases with the increase of the surplus amount,and the formula for correcting the return temperature is obtained.