In on-site inspection records, changes in inlet and outlet temperatures, flow rates, and pressure differentials on the hot and cold sides are often given priority attention. Design and selection personnel need to judge whether the heat exchanger meets process requirements based on these parameters. The following Q&A focuses on application scenarios.
A: The plate-and-shell heat exchanger uses a combined structure of a plate pack and a shell, and is suitable for steam-liquid and liquid-liquid heat exchange scenarios. It is commonly used in HVAC, district heating, and intermediate heat exchange links in chemical processes. During selection, the medium temperature, pressure, and corrosiveness must be clarified in order to match the plate material and gasket type.
A: The plate-and-shell type has a larger heat transfer area per unit volume, a compact structure, and a smaller footprint; it uses demountable gasket sealing, making it easy to pull the core for cleaning and maintenance. During design, the compatibility of the gasket material with the medium temperature and chemical properties must be verified, and space for core pulling must be reserved.
A: It is recommended to specify the inlet and outlet temperatures on the hot and cold sides, flow rates, allowable pressure drop, and whether there are temperature fluctuations, start-stop frequency, and installation space limitations. This information helps determine the number of plates, port orientation, and gasket selection, avoiding later rework.
