Modeling and simulation of a heat regenerator in cyclic equilibrium with radiation
- Univ. Simon Bolicar, Caracas (Venezuela)
Heat exchangers containing a heat storing mass are called generators. The heat storing mass, usually formed of prous packing material, offers a large heat transfer surface to the fluids passing through it. Regenerators are reversed at fixed, usually regular, time intervals. The thermal storing mass removes heat from the hot fluid passing through through it and after the reversal releases it to the cold fluid. The passages of the fluids, between which heat isexchanged, are separated in time but not spatially. Regenerators are clearly distinguished from recuperators by the fact that their operation depends not only on position but also on time, and an exact calculation is considerably more involved for regenerators than it is for recuperators. A comprehensive review article by Shah (1983) encompasses all aspects of regenator theory. However, one finds that the radiation mechanism has not been directly considered, except as part of the heat exchange coefficient (Razelos and Benjamin, 1978) or by including an apparent thermal solid conductivity involving a solid-solid-fluid contact radiation effect (Olale et al., 1980). With a high fluid temperature, it would seem appropriate to consider radiation energy transfer directly into the model equations, as is done in this work. Furthermore, in view of the attention focused in the last few years on the use of a porous bed as a solid matrix for energy storage in solar applications, this work also considers the effect of void fraction on the various heat transfer mechanisms.
- OSTI ID:
- 5345288
- Journal Information:
- Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Vol. 110:4A; ISSN 0022-1481
- Country of Publication:
- United States
- Language:
- English
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