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33 Cards in this Set
- Front
- Back
What military Standard applies for cooling systems that interface with electronics?
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MIL-STD-1399 Section 101
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What NSTM provides a system approach to the operation and maint of liquid cooling system for electronic equipment?
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NSTM chapter 532
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What makes up a Type I cooling system?
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SW/DW heat exchanger with SW/DW heat exchanger backup.
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What makes up a Type II cooling system?
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SW/DW heat exchanger with CW/DW heat exchanger backup.
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What makes up a Type III cooling system?
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CW/DW heat exchanger with CW/DW heat exchanger backup.
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What tempature regulating valve is used where Seawater is the cooling medium in the heat exchanger?
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3 way valve
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What tempature regulating valve is used where Chilled water is the cooling medium in the heat exchanger?
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2 way valve
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Where is the 2 way tempature valve installed?
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In CW supply to the heat exchanger with the sensing bulb installed in DW outlet from heat exchanger.
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How does the 3 way tempature valve operate?
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The temp sensitive elements respond to variations in temp and control the flow rate of the cooling medimum throught the heat exchanger. The results is demineralized water output of a temp that is consistent with operating parameters of the electronic system installed.
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What is the normal output temp range for most electronic equipment secondary loops?
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80-85 degrees
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What will happen if the secondary cooling loop operates below recommended temp range?
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Electronic equipment will sweat.
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How is flow regualtion accomplished?
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By means of flow regulators which control the quanity of water flowing through various parts of systems.
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How is purity of the cooling water systems maintained?
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With a demineralizer and monitored by purity cells and salinity cells.
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What component provides the indications that determine the need for changing the resigns in the deminerizers?
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Purity Cells
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How are salinity cells used in low purity systems?
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Provide an indication of seawater leakage into freshwater portion.
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An oxygen removal cartridge is used to prevent.
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Atmospheric corrision
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What is used to remove solids, dissolved metals and carbon dioxide from liquid cooling systems?
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Mixed bed cartridge
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What is used to remove minute particles from water in a liquid cooling system?
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Sub-micron filter
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What is the first step in cleaning a distilled water system?
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Replace flow switch assembly with temporary piping, remove strainer basket, and isolate water purifier.
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Why should you flush one section of cooling water at a time?
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Obtain maximum velocity for cleaning.
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What is the best solution for flushing a fresh water cooling system?
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solution of 160 degree freshwater and low sudzing detergent for 2 hours.
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What indication might indicate that the seawater strainer basket requires cleaning?
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Pressure exceeds clean pressure by 5 psig.
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What are the basic procedures for cleaning the DW section of an heat exchanger?
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Cleaned under a chemist direct supervision, using chemical means.
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What may be used to remove foreign matter from the tube interror for the SW section of a heat exchanger?
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water lance
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What is primary purpose of the expansion tank?
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to ensure positive pressure through out the water system, even when pumps are shutdown.
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What support system is used to ensure posistive pressure through out water sytem?
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LP air
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How is the flow of distilled water monitored in the cooling loop?
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Flow meter
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What is measured by electrodes of a purity cell?
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Resistance or conductivity of the water.
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How is tempature effect cancelled in a purity cell?
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Tempature compenstation
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SPS-49 utilized what type of cooling system?
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Type I
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What fixed device is used to control the pressure and flow of SW in primary loop?
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Orifice plate
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What is used to remove debris and sealife from SW side?
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Strainers
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How does a typical electronic heat exchanger function?
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Transfer heat from one fluid(DW) to another (coolant).
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