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Title: Microtube strip heat exchanger

The purpose of this contract has been to explore the limits of miniaturization of heat exchangers with the goals of (1) improving the theoretical understanding of laminar heat exchangers, (2) evaluating various manufacturing difficulties, and (3) identifying major applications for the technology. A low-cost, ultra-compact heat exchanger could have an enormous impact on industry in the areas of cryocoolers and energy conversion. Compact cryocoolers based on the reverse Brayton cycle (RBC) would become practical with the availability of compact heat exchangers. Many experts believe that hardware advances in personal computer technology will rapidly slow down in four to six years unless lowcost, portable cryocoolers suitable for the desktop supercomputer can be developed. Compact refrigeration systems would permit dramatic advances in high-performance computer work stations with conventional'' microprocessors operating at 150 K, and especially with low-cost cryocoolers below 77 K. NASA has also expressed strong interest in our MTS exchanger for space-based RBC cryocoolers for sensor cooling. We have demonstrated feasibility of higher specific conductance by a factor of five than any other work in high-temperature gas-to-gas exchangers. These laminar-flow, microtube exchangers exhibit extremely low pressure drop compared to alternative compact designs under similar conditions because of their much shorter flowmore » length and larger total flow area for lower flow velocities. The design appears to be amenable to mass production techniques, but considerable process development remains. The reduction in materials usage and the improved heat exchanger performance promise to be of enormous significance in advanced engine designs and in cryogenics.« less
Authors:
Publication Date:
OSTI Identifier:
7295355
Report Number(s):
DOE/CE/15440-T5
ON: DE92018709
DOE Contract Number:
FG01-90CE15440
Resource Type:
Technical Report
Research Org:
Doty Scientific, Inc., Columbia, SC (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; 42 ENGINEERING; DIRECT CONTACT HEAT EXCHANGERS; FEASIBILITY STUDIES; CRYOGENICS; ENCAPSULATION; ENERGY CONVERSION; HEAT TRANSFER; LAMINAR FLOW; PROGRESS REPORT; SIZE; TECHNOLOGY ASSESSMENT; TUBES; WELDING; CONVERSION; DOCUMENT TYPES; ENERGY TRANSFER; FABRICATION; FLUID FLOW; HEAT EXCHANGERS; JOINING 320303* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Equipment & Processes; 990200 -- Mathematics & Computers; 420200 -- Engineering-- Facilities, Equipment, & Techniques; 320201 -- Energy Conservation, Consumption, & Utilization-- Transportation-- Air & Aerospace