Econmical Saving Energy Operation Mode Of Heating System Based On Heating Medium Temperature

The resource-saving has been regarded as one of the basic national policies in our country. At present, the building energy-saving is unprecedented paid more attention . Our country has large scale and high energy consuming building heat supply. Its energy consumption for heating on unit area was 20 (kg/㎡.a) standard coal, which was 1～1.5 times compared to developed country in the same style of building heat supply and the same climate situation. Besides the problems of poor thermal insulation performance of building envelope, low efficient heating system and improper energy source control, which could result in high building heating consumption, another important reason was the prevalent operation mechanism of large flow rate and small temperature difference, which could bring about high transport consumption of pump and the waste of material for the terminal device and pipeline. The relationship between heating medium temperature in central heating system and system initial investment as well as transport consumption is studied in this article.Taking a residential architecture district for example in Changchun, it contain that relationship of secondary network investment as well as operation power consumption and heating medium temperature, relationship of primary network investment as well as operation power consumption and heating medium temperature, relationship of initial investment as well as operation power consumption and temperature difference in connection with heat transfer station, mixing-pump and direct connection. Analyzing the results to optimize heat medium temperature and return water temperature, and compred different heat medium temperature of Exergy efficiency and Exergy loss by Eexergy analysis.The results show that the heat medium temperature of heating system deserve greater impact on the economy, the higher the heat medium temperature, the greater difference in temperature, the smaller initial investment of the system pipe and transport energy consumption;In heating system, connection with mixing-pump has more superiority for saving systems initial investment and operating power consumption, it should be used widely. This paper also proposed the use of cost method in all year computing to determine the optimum return water temperature. when the water temperature of the second network is 60℃, the best return water temperature is 48℃; when the water temperature of the second network is 90℃, the best return water temperature is 64-66℃. Exergy use of thermodynamic analysis shows that as the heat source to the boiler heating system should be adopted in high-temperature heat medium. Appropriately increasing the heat medium temperature, reducing energy consumption and heating system to carry the material consumption has a significant impact.In this paper, the realationship among heat medium temperature, pipe connection, transport energy consumption, material consumption of central heating system are studied, it is applicable to heating system by boiler as the heat source, it has a universal significance on the central heating system design, operation and management. The results show that the heat medium temperature of heating system greater impact on the economy, the higher the heat medium temperature, the greater difference in temperature, the system pipe smaller initial investment and transport energy consumption;In heating system, Connection Type of mixing with water for saving systems initial investment and operating power consumption aspects show great advantages,it should actively promote the use widely. This paper also proposed the use of cost method in all year computing to determine the best return water temperature and the best method of best return water temperature calculation, when the water temperature of the second network is 60℃, the best return water temperature is 48℃; when the water temperature of the second network is 90℃, the best return water temperature is 64-66℃. Exergy use of thermodynamic analysis shows that as the heat source to the boiler heating system should be adopted in high-temperature heat medium. Appropriately increasing the heat medium temperature, reducing energy consumption and heating system to carry the material consumption has a significant impact.In this paper, the realationship among heat medium temperature, pipe connection, transport energy consumption, material consumption of central heating system are studied, it is applicable to heating system by boiler as the heat source, it has a universal significance on the central heating system design, operation and management.