Optimal design of plate heat exchangers

Velappan, K. C.; Saravanan, S.; Murugaraja, S.; Deepak, S.; Sivashanmugam, P.
July 2005
Chemical Business;Jul2005, Vol. 19 Issue 7, p32
Trade Publication
The traditional design method for the plate heat exchanger either Number of Transfer Units (NTU) or Logarithmic Mean Temperature Difference (LMTD) method involves many trials in order to meet the pressure drop constraints. This can be avoided through the developed design method, which takes the full utilization of the allowable pressure drop as a design objective. In this paper, an optimal design method for Plate Heat Exchanger (PHE) with and without pressure drop specifications is presented. The optimization is based on a thermal hydraulic model, which represents the relationship between heat transfer, pressure drop and exchanger area. A computer program in QBASIC has been developed for thermal design of a PHE. The design is first carried out for the situation with fixed allowable pressure drop. The complete optimal design without pressure drop specification is undertaken. In this case, the optimal values of Reynolds number, corresponding value of fluid velocities are determined through process optimization. The chevron angle is also optimized for the most common type Plate heat exchanger. Input data of two plant exchangers have been fed in to the program and the output variables/computed where comparable with the data, validating the programme.


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