15-02-2016, 04:33 PM
INTRODUCTION :
Three fluid and multi-fluid heat exchangers are widely used in cryogenics and different chemical processes, such as air separation, helium separation from natural gas, purification and liquefaction of hydrogen, and ammonia gas synthesis. Three fluid heat exchangers allow a more compact and economical design in various other applications also.A transient temperature response of parallel and counter three-fluid heat exchangers with finite core capacitance of the separating sheets is to be investigated numerically for the effect of temperature nonuniformity. Step perturbation is provided in the central (hot) fluid inlet temperature. A direct-transfer, three-fluid, parallel and counter flow plate heat exchanger can have four possible arrangements.
Due to the introduction of a third fluid the process of energy exchange in a three-fluid heat exchanger is more complex compared to that in a conventional heat exchanger. The central fluid stream exchanges heat simultaneously with two adjacent streams. The exact distribution of this thermal energy plays an important role in steady state as well as in the dynamic behaviour of the heat exchanger.In this phase of our project we have to develop a way to solve the Differential equations and obtain transient Temperature distribution. In the later phases of our project we will design and later optimize the heat exchanger.