Heat Rejection Concepts for Brayton Power Conversion Systems

Siamidis, John; Mason, Lee S.; Beach, Duane E.; Yuko, James R.

doi:10.2514/6.2004-5653

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…Typical heat pipes for JIMO have 2 m condensers (Mason, 2003, Siamidis et al, 2004. The first is that the water surface tension continually decreases as the temperature is increased, reducing the wick pumping capability.…”

Section: Heat Pipe Designmentioning

confidence: 99%

“…NASA is interested in Brayton cycle converters for Nuclear electric propulsion for missions including the proposed Jupiter Icy Moon Orbital (JIMO) mission (Mason, 2003, Siamidis et al, 2004. A radiator is required to dissipate the waste heat generated during the thermal-to-electric conversion process.…”

Section: Introductionmentioning

confidence: 99%

“…A radiator is required to dissipate the waste heat generated during the thermal-to-electric conversion process. Siamidis et al (2004) describe a typical radiator design for a Brayton system. Mason (2003) discusses the overall system concept.…”

Section: Introductionmentioning

confidence: 99%

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Water Heat Pipe Radiator Trade Study for the 300–550 K Temperature Range

Anderson¹,

Stern²

2005

AIP Conference Proceedings

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A heat pipe radiator trade study has been completed for radiators in the 300-550 K temperature range. Initially, a thorough component level study was completed to determine heat pipe operating properties over the temperature range, particularly at the high end where the Merit Number starts fall off. Heat pipe designs for different dimensions were developed, and the maximum heat pipe power was determined. A trade study was then conducted that varied heat pipe O.D., evaporator length, heat pipe length, temperature, heat pipe spacing, fin thickness, and fin thermal conductivity. The radiator design that maximized specific power is shown, as well as the variation in mass with heat pipe spacing. RADIATOR PANEL DESIGNThe overall radiator panel layout is shown in Figure 1. The panel has the following: 1. A series of titanium/water heat pipes to transfer heat from the secondary fluid to the radiator panel 2. High conductivity graphite foam saddles to form an interface between the circular heat pipe and the flat fin 3. High conductivity Graphite Fiber Reinforced Composites (GFRC) fins 4. Aluminum honeycomb to provide stiffness to the structure The heat pipe configuration assumes that a series of round heat pipes (with integral saddles) are embedded in the radiator panel to distribute heat. The thermally active part of the radiator panel uses high-temperature-capable Graphite Fiber Reinforced Composites (GFRC's). This is a polymer matrix material, which we feel represents a

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Section: Heat Pipe Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water Heat Pipe Radiator Trade Study for the 300–550 K Temperature Range

Anderson¹,

Stern²

2005

AIP Conference Proceedings

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“…A pumped-loop heat transport system coupled to a heat pipe radiator, similar to the JIMO concept (Siamidis, et al, 2005), is proposed for all three power conversion options. The heat pipe radiator approach permits efficient heat spreading to the panel surface and reduces the vulnerability to micrometeoroid damage as compared to an all pumped-loop system.…”

Section: Heat Rejection Conceptmentioning

confidence: 99%