Electricity costs are an uneconomical way of operating

It was demonstrated that this operating mode can improve the hydraulic stability of the single and double pipe indoor heating system and the network to reduce the network heat loss, and save the fuel consumption to improve the most unfavorable loop room temperature for users. However, the problem of uneven cooling and heating and the problem of hydraulic imbalance have not been solved, and a large increase in the cost of electrical energy for transporting hot water is an uneconomical mode of operation. It is proposed that the hydraulic stability of the indoor heating system and the outdoor pipe network system can only be improved in the design, the heat transfer coefficient of the heat transfer coefficient of the radiator is calculated accurately, and the system debugging work can be strengthened to solve the uneven heating and cooling. Heating pipe network large-flow small-temperature difference operation mode The concept of large-flow and small-temperature difference operation mode The large-flow and small-temperature operation mode means that the actual operation flow of the heating network is greater than the design flow or the ideal flow. When the actual operation flow is greater than the design flow or the ideal flow, the temperature difference between the supply and return water of the heating pipe network will inevitably be less than the design value or the ideal value (ie, the actual water supply temperature of the heating network decreases and the return water temperature increases). Therefore, the large flow and small temperature difference occur at the same time. The reason for the large flow and small temperature difference operation mode lacks the quantitative adjustment device for eliminating the residual head of the heating system loop. Currently, the globe valve and the gate valve do not have the adjustment function. The adjustment valve has the adjustment function but there is no quantitative display, and the orifice plate is often difficult. Accurately calculated, coupled with its easy to plug, the remaining pressure head of the favorable loop can not be eliminated only by the diameter change, manual adjustment of the heat network by experience, hydraulic imbalance is inevitable. It is common for heat users near the heat source to overheat, exceeding the interior design temperature, and away from the end of the heat source to reach the design room temperature. Others believe that users with poor heating effect are naturally caused by insufficient circulation flow. Therefore, they adopt the method of increasing the circulation pump flow rate to solve the phenomenon of uneven cooling and heating. The circulating water pump of the hot water heating system is too large. When designing the heating system, the pump model is selected according to two parameters. The flow rate is the total system flow (according to the total load). The lift is determined according to the most unfavorable loop resistance loss plus a certain safety factor, because the actual resistance is often lower than the design resistance. The operating point of the pump is at the lower right side of the nameplate area of ​​the pump characteristic curve, making the actual water volume large.