Abstract
In the present paper, a model for the transient simulation of a 2 layer plate fin heat exchanger having offset strip fins with helium as working fluid is formulated based on unsteady mass and energy conservation equations. The behaviour of the heat exchanger during start up from a given initial condition, cool down and during a step and ramp change in the inlet temperature of one of the fluids is studied with the help of this model. Initially, a model based on average helium properties is developed which is further extended to take into account the temperature dependence of helium properties along with axial heat conduction and variable thermal capacity of the metal separating plate. A computer code has also been developed to this effect.
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