【Daily Question】Utilities - Water Supply and Drainage - 20200322

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Depending on the circulation method of the hot water piping network, hot water supply systems can be classified into ( ). A. Natural circulation hot water supply systems and mechanical circulation hot water supply systems B. Non-circulation hot water supply systems, semi-circulation hot water supply systems, and full-circulation hot water supply systems C. Continuous circulation hot water supply systems and timed circulation hot water supply systems D. Riser circulation hot water supply systems and non-circulation hot water supply systems Answer: B. Option A is classified based on the driving force for circulation in the hot water piping network; Option C is classified according to the operating mode of the piping network; Option D is classified by the circulation method, but its coverage is not comprehensive enough, as riser circulation falls under the category of semi-circulation systems