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Problems and solutions for the renovation of heating and exchange stations in universities

Problems and solutions for the renovation of heating and exchange stations in universities
Due to the rapid development of higher education, higher requirements have been put forward for the renewal and expansion of heating equipment and facilities in schools. Various problems are prone to occur during the heating renovation process in universities. This article proposes a solution for the renovation of heat exchange stations and studies how it can be more conducive to the sustainable development of heating renovation plans.
Is the heating system for direct or indirect heating? Due to the particularity of university architecture, it is a diverse architectural complex with a large number of buildings for different purposes such as student dormitories, family residences, teaching and experimental buildings, libraries, etc. These buildings require different heating temperatures and heating times. If heating is not done according to the simple standards of building properties, it will cause significant waste. Heating in universities should be classified according to the nature of the building, and buildings with similar heating time and temperature should be divided into the same or multiple heat exchange stations. It is recommended to control the area under the jurisdiction of the heat exchange station at around 80000 square meters and the heating radius within its jurisdiction at around 400 meters. This is because the above data shows that the equipment of the heat exchange station is more economical, and the electrical equipment capacity happens to be at the economic node. Similarly, the selection of heating radius is also within the range of minimizing heating blind spots and effectively regulating hydraulic balance.
In addition, boiler rooms in various schools are generally located downwind of the entire school, with most of them built on the edge of the school, resulting in a large heating radius, severe hydraulic imbalance, difficult system regulation, and many blind spots in heating. Blindly increasing the circulation pump not only wastes energy, but also cannot fundamentally solve the problem. If multiple heat exchange stations are constructed within a reasonable division of areas on campus, the heating distance can be reduced, and the heating temperature and time of the heat exchange stations can be adjusted according to the nature of the building.
Another advantage of indirect heating is that it greatly reduces the loss of network circulating water, reduces system water replenishment, reduces heat loss, and improves the heating efficiency of the boiler. The system is filled with high-quality water for deoxygenation and softening, reducing the generation of equipment and pipeline scale, especially the corrosion of the boiler, greatly extending the service life and maintenance cycle of the boiler.
At present, plate heat exchange is the most popular indirect heating method. According to heat transfer theory, the faster the flow rate of heat exchange fluids, the higher the heat exchange efficiency. If a narrow channel design is adopted, the fluid path inside the heat exchanger is long, the flow rate is fast, and the heat transfer efficiency is high. However, the increase in fluid flow rate of this product undoubtedly greatly increases the resistance of the heat exchanger. In addition, the secondary network water quality in many regions is turbid, causing blockage of the heat exchanger flow channels in a short period of time, further increasing the circulation resistance of the system, deteriorating the most unfavorable loop heating effect of the pipeline network, and increasing the number of non hot spots in the system year by year; Although heat exchangers can be cleaned regularly, the inherent defects caused by these types of heat exchangers cannot be overcome, but they also increase the maintenance capacity and cost of the equipment. In summary, this type of heat exchanger is not suitable as a heating exchanger. At present, there are various types and models of plate heat exchangers with reasonable prices. It can overcome the shortcomings of the imported plate heat exchanger mentioned above, reduce system resistance, have a long maintenance cycle, easy to purchase sealing gaskets, and low prices.