Positive displacement, semi-positive displacement, flow-guiding positive displacement. Guided-flow semi-volumetric heat exchangers: Comparison and analysis

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A volumetric heat exchanger is easy to understand: it is a heating device that can withstand pressure and store a certain amount of hot water. Simply put, it’s a tank with some heating tubes inserted into it. Guided-type volumetric heat exchanger: A volumetric heat exchanger that guides the flow of the water to be heated toward the heating tubes. A semi-volume heat exchanger is a combination of a rapid heat exchanger and a volume heat exchanger. It’s simply about putting a complete heat exchanger into the tank. A flow-guiding semi-volumetric heat exchanger has a cylinder for the internal heat exchanger, as well as flow-guiding devices inside; its structure is more complex and its manufacture is more difficult. I work in sales, so my understanding might be a bit limited; please forgive me. If there are any mistakes or omissions, I hope everyone will point them out and provide supplements. Let’s learn together*, okay? Show the image below