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This post was last edited by hesonchang214 on 2020-3-24 at 10:20. Which of the following statements regarding the selection of heat sources for centralized hot water supply systems is correct? A. It is advisable to use a thermal pipeline network that can ensure heating throughout the year as the heat source. B. When using waste heat boilers to produce heating medium, the temperature of the waste steam and flue gas fed into these boilers should not exceed 400°C. C. In the absence of industrial waste heat, geothermal energy, solar energy, thermal pipeline networks, or steam or hot water supplied by regional boiler rooms, fuel or gas-fired hot water units can be used to supply hot water directly. D. Heating equipment that uses solar energy as its heat source should operate independently; there is no need for additional heating devices. Answer: C. Option A does not comply with the provisions of Article 5.2.2 of the current “Code for Design of Building Water Supply and Drainage Systems”. It is advisable to use industrial waste heat, exhaust heat, geothermal energy, solar energy, etc. as heat sources first; when such sources are not available, thermal distribution networks that can ensure heating throughout the year should be given priority as heat sources. Option B does not comply with the provisions of Note 1 in Article 5.2.2 of the current Code for Design of Building Water Supply and Drainage. To ensure heat exchange efficiency, the temperature of the waste steam and flue gas introduced into the waste heat boiler should be no less than 400°C, rather than not exceeding 400°C. Option C complies with the provisions of Article 5.2.5 of the current Code for Design of Building Water Supply and Drainage. Option D does not comply with the provisions of Note 2 in Article 5.2.2 of the current \"Code for Design of Building Water Supply and Drainage Systems\". Heating equipment that uses solar energy as a heat source cannot operate around the clock due to factors such as sunlight duration and weather conditions like wind, snow, rain, and dew; therefore, it is advisable to install an additional heating system to assist in supplying hot water when the solar water heater is not sufficient