COMPUTING RADIANT INTERCHANGE AMONG REAL SURFACES

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$171,724.00
Award Year:
1990
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
10421
Agency Tracking Number:
10421
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Frederick A Costello Inc. (Currently Frederick A. Costello, Inc.)
12864 Tewksbury Dr, Herndon, VA, 22071
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Frederick A Costello
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
WE PROPOSE TO DEVELOP A FORTRAN COMPUTER PROGRAM TO DETERMINE THE THERMAL RADIANT INTERCHANGE FACTORS AMONG REAL, NON-DIFFUSE, NON-SPECULAR SURFACES. THE INNOVATION LIES IN OUR SOLUTION PROCEDURE, WHICH YIELDS, IN ONE STEP, AN EXACT SOLUTION TO THE COMPUTATIONAL PROBLEM. PREVIOUS METHODS FOR REAL SURFACES ARE BASED ON RAY-TRACE, MONTE CARLO SIMULATIONS, WHICH ARE COSTLY AND INACCURATE FOR NON-IDEAL SURFACES; OR ON AN ADAPTION OF STRAY-LIGHT METHODS FOUND IN OPTICS TECHNOLOGIES, A COSTLY AND CUMBERSOME METHOD THAT IS INACCURATE FOR HIGHLY SPECULAR SURFACES. THE COSTLINESS, AWKWARDNESS AND INACCURACY OF THESE PREVIOUS METHODS CAUSES SPACECRAFT DESIGNERS TO DESIGNWITH THE SIMPLER PURE-DIFFUSE/PURE-SPECULAR MODELS WHICH INCUR CURRENTLY UNKNOWABLE INACCURACIES. THEREFORE, TODAY'SDESIGNERS CANNOT ASCERTAIN THE ADEQUACY OF MANY OF THEIR DESIGNS. THE RESULT OF OUR DEVELOPMENT, WHICH WILL BE COMPLETED IN PHASE II, IS OF GREAT IMPORTANCE TO CURRENT AND FUTURE NASA MISSIONS. FOR EXAMPLE, A RADIATOR ON THE MOON THAT USES NON-DIFFUSE REFLECTORS TO DIVERT SUNLIGHT CAN ACHIEVE END-OF-LIFE SINK TEMPERATURES OF 2 F; TODAY'S FLAT-PLATE RADIATOR DESIGNS CAN ACHIEVE ONLY 94 F -- SO HIGH THAT A COSTLY AND RELATIVELY UNRELIABLE HEAT PUMP IS NEEDED. SIMILAR PERFORMANCE IMPROVEMENTS ARE POSSIBLE WITH NON-DIFFUSE REFLECTORS FOR SPACE RADIATORS OPERATING AT 80 K. THE PROPOSED COMPUTER PROGRAM WILL PROVIDE THE TOOL NECESSARY FOR THE DESIGN OF SUCH RADIATORS.

* information listed above is at the time of submission.

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