There are many ways to utilize heat from city sewage, but the effective way is to utilize sewage. This means that in summer, excess heat from the building is discharged into the municipal sewage through the unit, and in winter, heat from the municipal sewage is discharged into the building through the unit.
The resource potential of municipal wastewater heat is largely dependent on the temperature of the wastewater. After municipal wastewater treatment, the annual water temperature varies within a certain range. For example, the water temperature after secondary sewage treatment ranges from 13 to 16°C in winter and 22 to 26°C in summer. In general, the sewage temperature is 20°C higher than that of North China in winter and more than 10°C lower in summer. Using the temperature difference between sewage and the environment to obtain heat energy has great prospects for energy utilization. Sometimes the heat exchanger does not work.
In addition, there is no readily available data on the effect of various harmful components of sewage on the corrosion of titanium tube materials. All these bring great difficulties to the research of sewage titanium tube. According to different quality of sewage. What kind of system should be used, what kind of material and form of titanium tube should be used so that it still has good heat transfer performance in the sewage, which is a difficult point in the design of sewage system.
The use of sewage system for cooling and heating of buildings can make full use of the residual heat in the city sewage and reduce the consumption of high-rise energy. Not only saves energy, but also reduces environmental pollution and water consumption, sewage treatment devices work efficiently, the mechanical room occupies a small area, significantly reducing the operating costs and initial investment costs.
So sewage, as a renewable energy source, has been recognized in building air conditioning systems, and is gradually being used more and more in China. Although the sewage source heat pump system has many advantages. But due to the special characteristics of sewage. This can easily lead to poor working conditions of the heat pump. In particular, the working conditions of the heat pump titanium tube are worse. When the sewage passes through the titanium tube, the sewage composition is very complex. It can lead to scaling, clogging and even corrosion on the surface of the titanium tube.
Due to these phenomena, the heat exchange efficiency of the titanium tube is reduced. The resistance to fluid flow increases, and the life of the titanium tube is shortened.
