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Pump and Flow Control Subassembly of Thermal Control Subsystem for Photovoltaic Power ModuleThe pump and flow control subassembly (PFCS) is an orbital replacement unit (ORU) on the Space Station Freedom photovoltaic power module (PVM). The PFCS pumps liquid ammonia at a constant rate of approximately 1170 kg/hr while providing temperature control by flow regulation between the radiator and the bypass loop. Also, housed within the ORU is an accumulator to compensate for fluid volumetric changes as well as the electronics and firmware for monitoring and control of the photovoltaic thermal control system (PVTCS). Major electronic functions include signal conditioning, data interfacing and motor control. This paper will provide a description of each major component within the PFCS along with performance test data. In addition, this paper will discuss the flow control algorithm and describe how the nickel hydrogen batteries and associated power electronics will be thermally controlled through regulation of coolant flow to the radiator.
Document ID
Document Type
Conference Paper
Motil, Brian
(NASA Lewis Research Center United States)
Santen, Mark A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
ISSN: 0148-7191
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
SAE PAPER 932150
Meeting Information
International Conference on Environmental Systems(Colorado Springs, CO)
Accession Number
Distribution Limits

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