Graduate Thesis Or Dissertation
 

Performance of rotary regenerative heat exchanger--a numerical simulation

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  • This thesis examines the transient and steady-state temperature performance of a rotary regenerative heat exchanger. In contrast to previous studies on this problem, fluid flow in the circumferential direction was considered. Appropriate modeling was included to measure the effect of carry-over on the differential equations describing mass and energy conservation. The energy equations describing transient temperature profiles in two spatial dimensions were derived from the general case. These energy equations were then non-dimensionalized for the case where both fluids were identical, producing the appropriate parameters for evaluating performance. A step-by-step system was obtained in explicit form for the fluid temperatures and in implicit form for the matrix temperature using upstream differencing methods. The errors for this numerical system were analyzed and a necessary condition for stability was obtained. Sample problems for balanced and symmetrical cases were solved and the effect of carry-over and matrix rotation speed on performance was discussed. A parameter representing the effects of carry-over was suggested. This thesis treats two conditions not considered previously. These are the effects of carry-over on regenerator performance and the solution of transient temperature profiles in both axial and circumferential directions. Carry-over effects were evaluated to be unimportant, however a more complete description of the temperature field suggests that previous results for unit effectiveness are in error by as much as 13 percent.
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