During design selection, it is common to encounter situations where equipment foundations have already been reserved and available on-site space is limited. In such cases, the allowable installation space and interface orientation must first be confirmed, and then the heat exchanger's external dimensions and nozzle positions can be derived. The QCR-88 tube-fin heat exchanger supports customized interface orientation according to submission requirements, avoiding on-site re-piping caused by mismatched nozzle directions. During the engineering submission stage, four basic data items should be provided: medium composition, flow rate, inlet and outlet temperatures, and allowable pressure drop, to facilitate calculation of the heat balance between the tube side and fin side.
In industrial waste heat recovery or drying line scenarios, flue gas or hot air may contain corrosive components such as sulfur and chlorine. Fin material and surface treatment directly affect service life. During selection, the approximate concentration of corrosive components in the medium and the dew point temperature should be specified, so that a match can be made among carbon steel, stainless steel, or coated fins. For airflows with high dust content, the fin spacing can be appropriately enlarged to reduce the risk of ash accumulation and blockage.
Allowable pressure drop is often an implicit constraint in selection. Increasing the fin-side flow velocity can reduce equipment volume, but pressure drop rises accordingly. In the design of the QCR-88, the fin pitch and number of tube rows can be adjusted according to the user-specified pressure drop upper limit, controlling fan or system resistance while meeting heat transfer requirements. It is recommended to specify the allowable pressure drop under normal and maximum operating conditions during submission, so as to leave adjustment margin.
After the heat exchanger is put into operation, the fin surfaces need regular cleaning. During selection, maintenance space should be reserved, and it should be confirmed whether removable panels are provided on the fin side. Before shutdown cleaning, the power supply should be cut off first, and operation should wait until the surface temperature drops to ambient temperature to avoid burns or electric shock. For continuous operation applications, two parallel units can be designed for alternating use to reduce overall downtime.
