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Temperature Control with Two Parallel Small Loop Heat Pipes for GLM ProgramThe concept of temperature control of an electronic component using a single Loop Heat Pipe (LHP) is well established for Aerospace applications. Using two LHPs is often desirable for redundancy/reliability reasons or for increasing the overall heat source-sink thermal conductance. This effort elaborates on temperature controlling operation of a thermal system that includes two small ammonia LHPs thermally coupled together at the evaporator end as well as at the condenser end and operating "in parallel". A transient model of the LHP system was developed on the Thermal Desktop (TradeMark) platform to understand some fundamental details of such parallel operation of the two LHPs. Extensive thermal-vacuum testing was conducted with two thermally coupled LHPs operating simultaneously as well as with only one LHP operating at a time. This paper outlines the temperature control procedures for two LHPs operating simultaneously with widely varying sink temperatures. The test data obtained during the thermal-vacuum testing, with both LHPs running simultaneously in comparison with only one LHP operating at a time, are presented with detailed explanations.
Document ID
20150001430
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Khrustalev, Dmitry (ATK Space Systems and Services Beltsville, MD, United States)
Stouffer, Chuck (ATK Space Systems and Services Beltsville, MD, United States)
Ku, Jentung (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hamilton, Jon (Lockheed Martin Space Systems Co. Palo Alto, CA, United States)
Anderson, Mark (Lockheed Martin Space Systems Co. Palo Alto, CA, United States)
Date Acquired
February 10, 2015
Publication Date
January 1, 2014
Publication Information
Publication: Frontiers in Heat Pipes (FHP)
Volume: 5
Issue: 9
Subject Category
Fluid Mechanics and Thermodynamics
Report/Patent Number
GSFC-E-DAA-TN19620
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
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Two-Phase Heat Transfer
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