A Self-Regulating Freezable Heat Exchanger for Spacecraft

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$687,217.00
Award Year:
2013
Program:
STTR
Phase:
Phase II
Contract:
NNX13CJ46C
Award Id:
n/a
Agency Tracking Number:
110137
Solicitation Year:
2011
Solicitation Topic Code:
T6.01
Solicitation Number:
n/a
Small Business Information
12345 W. 52nd Ave., Wheat Ridge, CO, 80033-1916
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
181947730
Principal Investigator:
Robert Copeland
Principal Investigator
(303) 940-2323
Copeland@tda.com
Business Contact:
John Wright
Chief Technology Officer
(303) 940-2300
krhodus@tda.com
Research Institute:
University of Colorado at Boulder
Anselmo Serralheiro
572 UCB
Boulder, CO, 80309-80309
() -
Domestic nonprofit research organization
Abstract
A spacecraft thermal control system must keep the vehicle, avionics and atmosphere (if crewed) within a defined temperature range. Since water is non-toxic and good for heat transport, it is typically used as the coolant that circulates within the crew cabin boundary. This loop then interfaces with another low freeze point fluid, such as ammonia, for transport of heat to a radiator where the temperatures can be considerably below the freezing point of water. The volumetric expansion during freeze usually prevents its use in external systems since freezing will damage the components. Yet, if the system can accommodate the forces generated by freezing, then selectively allowing parts of a heat exchanger to freeze can be used to passively increase the turn-down of the heat rejection from radiators. TDA Research, Inc. has been developing freezable water/ice phase change heat exchangers for several years that offer several advantages: they can eliminate the need for a separate heavy Freon or ammonia loop; use the buildup of ice to regulate the rate of heat transfer, and the endotherm of melting ice can absorb peak loads from the spacecraft to reduce the size and mass of the radiator. Therefore, TDA Research and the University of Colorado set out to demonstrate a lightweight and freeze tolerant water/ice heat exchanger to passively regulate the heat rejection rate from the water coolant loop of a manned spacecraft to its heat sink systems. The heat exchanger has no actively moving parts and is thus extremely reliable. In Phase I, we designed and built a self-regulating freezable heat exchanger that we put through 191 freeze/thaw cycles without damage and it has the capability to transfer the loads expected in crewed spacecraft. In Phase II, we will design, build and test a large-scale freeze tolerant water/ice heat exchanger that forms the heart of a thermal control system that we will deliver to NASA.

* information listed above is at the time of submission.

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