There are some criteria for a successful heat exchanger design.
These principles are given below
The process requirements which are accomplishing the thermal change on the streams within the allowable pressure drops, and retaining the capability to do this in the presence of fouling until the next scheduled maintenance period must be fulfilled.
• The heat exchanger must withstand the service conditions of the plant environment.
• The exchanger must be maintainable. In other words, a configuration that permits cleaning and replacement of any component that is especially vulnerable to corrosion, erosion, vibration, or aging, must be chosen.
• The designer should consider the advantages of a multi shell arrangement with flexible piping and valving provided to allow one unit to be taken out of service for maintenance without disturbing the rest of the plant.
• The heat exchanger should cost as little as possible provided that the above criteria are satisfied. • Limitations on the heat exchanger length, diameter, weight, and/or tube specifications due to site requirements, lifting and servicing capabilities must be all taken into consideration in the design