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Modular Membrane Controlled Three-phase Deployable Radiator (MMC-TDR)

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: 80NSSC20C0606
Agency Tracking Number: 206840
Amount: $124,948.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: Z2
Solicitation Number: SBIR_20_P1
Solicitation Year: 2020
Award Year: 2020
Award Start Date (Proposal Award Date): 2020-08-12
Award End Date (Contract End Date): 2021-03-01
Small Business Information
200 Yellow Place
Rockledge, FL 32955-5327
United States
DUNS: 175302579
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Jeff Milkie
 (321) 631-3550
Business Contact
 Kate Wensil
Phone: (321) 631-3550
Research Institution

Mainstream proposes a Modular Membrane Controlled Three-phase Deployable Radiator (MMC-TDR) that has a turndown ratio of 200:1, a mass of only 7.8 kg, and design life of over 15 years. The key enabling components of the MMC-TDR are 1) a passive, reliable membrane phase separator for robust two-phase flow control in the absence of gravity, 2) a passive bypass valve which regulates flowrates in the radiator to control heat rejection, and 3) a modular, deployable tube-on-plate three phase radiator design which is three-phase compatible. The system integrates with a two-phase pumped loop using ammonia as the process fluid. The MMC-TDR uses an integrated membrane phase separator that achieves separation via capillary action, so that operation is insensitive to gravity and inertia effects. Separate vapor and liquid ammonia streams are distributed to the freezable radiator through two distributions headers. The subcooled liquid from both streams is combined at the outlet of the radiator array in the collection header. The MMC-TDR will use increased pressure losses and heat transfer from longer channel lengths with a variable opening PCM bypass valve to selectively reduce flow through outer most channels as heat load is reduced. The reduction in flow will results in high degrees of subcooling until freezing occurs. The percentage of flow through the bypass line vs. the radiator channels is passively controlled by modulating the bypass valve position, increasing or reducing the bypass line pressure drop relative to the channel pressure drops. The PCM bypass valve regulates the flow through the system to achieve the desired subcooled temperature, effectively allowing the radiator channels to gradually lose flow and freeze during periods of low desired heat dissipation. The freezable radiator panel is constructed of a series of parallel ldquo;Urdquo; channels. The channels are constructed of aluminum encased Inconel tubes.

* Information listed above is at the time of submission. *

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