Low-Cost Phase-Distribution Enhancement for Two-Phase Heat Exchangers

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$149,764.00
Award Year:
2014
Program:
SBIR
Phase:
Phase I
Contract:
N00014-14-P-1167
Agency Tracking Number:
N141-068-1046
Solicitation Year:
2014
Solicitation Topic Code:
N141-068
Solicitation Number:
2014.1
Small Business Information
Mainstream Engineering Corporation
200 Yellow Place Pines Industrial Center, Rockledge, FL, 32955-5327
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
000000000
Principal Investigator:
Joshua Sole
Sr. Engineer
(321) 631-3550
jsole@mainstream-engr.com
Business Contact:
Michael Rizzo
CFO
(321) 631-3550
mar@mainstream-engr.com
Research Institution:
n/a
Abstract
Military Environmental Control Units (ECUs) are one of the greatest consumers of electric energy in forward operating bases (FOBs). Microchannel condensers have replaced tube-fin coils in both military ECUs and commercial air conditioners to improve system efficiency. Flow into the condenser is single-phase superheated vapor and therefore uniform flow distribution through multiple parallel microchannel arrays is easily achieved. Manufacturers are interested in exploiting the same benefits by replacing the tube-fin evaporator coil with a microchannel heat exchanger. However, flow into the evaporator is a saturated mixture of liquid and vapor refrigerant, typically at a thermodynamic quality of 0.1 0.4, and therefore two-phase flow distribution through a multitude of parallel microchannels can be very non-uniform. In this proposal, Mainstream compares multiple concepts for achieving two-phase distribution in a microchannel evaporator. Pros and cons of each concept regarding cost, manufacturability, size, and weight are summarized. A final concept is selected for investigation in Phase I. A preliminary two-phase finite element model of the phase distribution phenomena for the selected concept is presented and results are discussed. Based on this model we expect to reduce the two-phase maldistribution to less than 10%.

* information listed above is at the time of submission.

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