The selection of a hot and cold heat exchanger typically starts with three parameters: heat transfer capacity, allowable pressure drop, and medium corrosiveness. Taking the HRS-960 model as an example, the heat transfer capacity of a single unit under design conditions can be configured within a wide range according to process requirements. The plate material and flow channel combination are determined based on medium characteristics, and procurement personnel can verify these item by item with the supplier accordingly.
Under the same heat transfer capacity, the footprint of a plate-type hot and cold heat exchanger is usually smaller than that of a shell-and-tube solution, and disassembly and cleaning are more convenient; shell-and-tube types are more adaptable in high-pressure, high-temperature, and particle-containing medium applications. Procurement personnel should make trade-offs based on medium cleanliness, maintenance cycle, and installation space, and should not judge solely by initial investment. The HRS-960 model adopts a detachable plate structure, facilitating periodic inspection of scaling conditions.
When the medium is corrosive, the compatibility of the heat exchange plate material should first be confirmed, and the supplier should be required to provide material certificates and corrosion resistance data. If corrosiveness is strong, consideration may be given to replacing the heat exchange plates with compatible materials or adding anti-corrosion coatings. It is recommended that the procurement documents specify the medium composition, concentration, and operating temperature as the basis for material selection, to avoid rework due to material mismatch after delivery.
It is recommended to record inlet and outlet temperature and pressure data across different seasons to provide a basis for subsequent selection adjustments. These data can both reflect the margin of the equipment under actual operating conditions and serve as a reference for capacity expansion or plate replacement. Procurement personnel can stipulate the data recording frequency and delivery format in the technical agreement.
The technical agreement should preferably list design pressure, design temperature, plate material, gasket material, connection specifications, and allowable pressure drop, and clearly specify factory inspection items. For corrosive medium applications, the supplier may be required to provide material certificate documents with the goods as a basis for acceptance.
