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COBEM 2019
25th International Congress of Mechanical Engineering
THERMAL MODELING OF A RADIATOR ASSEMBLY COUPLED TO A REGENERATIVE CLOSED BRAYTON CYCLE
Submission Author:
Guilherme Borges Ribeiro , SP , Brazil
Co-Authors:
Luis Felipe Ribeiro Romano, Guilherme Borges Ribeiro
Presenter: Guilherme Borges Ribeiro
doi://10.26678/ABCM.COBEM2019.COB2019-0125
Abstract
Compact energy conversion systems for space applications allow the emergence of new mission possibilities and technological applications. Besides energy availability, another crucial factor of any energy conversion system for space purposes is its total mass and size. For a regenerative Closed Brayton Cycle (CBC) as the energy conversion system for a nuclear power system, thermal analysis was carried out in order to predict the overall properties of the cold side of the system (i.e., heat pipes and radiator) under the influence of the hot side temperature of operation. Titanium-water Heat Pipe and aluminum Radiator panels compose the Heat Pipe-Radiator (HP-RAD) assembly, which is discretized in similarly operating control volumes (CV), each positioned along the Cold Heat Exchanger (CHE) and possessing a variable geometry, resulting in a trapezoidal-shaped radiator as output. Each CV has the heat transfer rate determined by the panel dimensions, while the HP is modeled to fit the given geometry, being later verified against known operational limits. CBC and HP-RAD models are coupled and their conjunct solution provides operational data for evaluation and aid for the design of the heat rejection system, such as expected number of HP, total assembly mass, length energy conversion efficiency.
Keywords
Radiator, Brayton, heat pipe, Space
