Cooling Systems

Front 1

What military Standard applies for cooling systems that interface with electronics?

Back 1

MIL-STD-1399 Section 101

Front 2

What NSTM provides a system approach to the operation and maint of liquid cooling system for electronic equipment?

Back 2

NSTM chapter 532

Front 3

What makes up a Type I cooling system?

Back 3

SW/DW heat exchanger with SW/DW heat exchanger backup.

Front 4

What makes up a Type II cooling system?

Back 4

SW/DW heat exchanger with CW/DW heat exchanger backup.

Front 5

What makes up a Type III cooling system?

Back 5

CW/DW heat exchanger with CW/DW heat exchanger backup.

Front 6

What tempature regulating valve is used where Seawater is the cooling medium in the heat exchanger?

Back 6

3 way valve

Front 7

What tempature regulating valve is used where Chilled water is the cooling medium in the heat exchanger?

Back 7

2 way valve

Front 8

Where is the 2 way tempature valve installed?

Back 8

In CW supply to the heat exchanger with the sensing bulb installed in DW outlet from heat exchanger.

Front 9

How does the 3 way tempature valve operate?

Back 9

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.

Front 10

What is the normal output temp range for most electronic equipment secondary loops?

Back 10

80-85 degrees

Front 11

What will happen if the secondary cooling loop operates below recommended temp range?

Back 11

Electronic equipment will sweat.

Front 12

How is flow regualtion accomplished?

Back 12

By means of flow regulators which control the quanity of water flowing through various parts of systems.

Front 13

How is purity of the cooling water systems maintained?

Back 13

With a demineralizer and monitored by purity cells and salinity cells.

Front 14

What component provides the indications that determine the need for changing the resigns in the deminerizers?

Back 14

Purity Cells

Front 15

How are salinity cells used in low purity systems?

Back 15

Provide an indication of seawater leakage into freshwater portion.

Front 16

An oxygen removal cartridge is used to prevent.

Back 16

Atmospheric corrision

Front 17

What is used to remove solids, dissolved metals and carbon dioxide from liquid cooling systems?

Back 17

Mixed bed cartridge

Front 18

What is used to remove minute particles from water in a liquid cooling system?

Back 18

Sub-micron filter

Front 19

What is the first step in cleaning a distilled water system?

Back 19

Replace flow switch assembly with temporary piping, remove strainer basket, and isolate water purifier.

Front 20

Why should you flush one section of cooling water at a time?

Back 20

Obtain maximum velocity for cleaning.

Front 21

What is the best solution for flushing a fresh water cooling system?

Back 21

solution of 160 degree freshwater and low sudzing detergent for 2 hours.

Front 22

What indication might indicate that the seawater strainer basket requires cleaning?

Back 22

Pressure exceeds clean pressure by 5 psig.

Front 23

What are the basic procedures for cleaning the DW section of an heat exchanger?

Back 23

Cleaned under a chemist direct supervision, using chemical means.

Front 24

What may be used to remove foreign matter from the tube interror for the SW section of a heat exchanger?

Back 24

water lance

Front 25

What is primary purpose of the expansion tank?

Back 25

to ensure positive pressure through out the water system, even when pumps are shutdown.

Front 26

What support system is used to ensure posistive pressure through out water sytem?

Back 26

LP air

Front 27

How is the flow of distilled water monitored in the cooling loop?

Back 27

Flow meter

Front 28

What is measured by electrodes of a purity cell?

Back 28

Resistance or conductivity of the water.

Front 29

How is tempature effect cancelled in a purity cell?

Back 29

Tempature compenstation

Front 30

SPS-49 utilized what type of cooling system?

Back 30

Type I

Front 31

What fixed device is used to control the pressure and flow of SW in primary loop?

Back 31

Orifice plate

Front 32

What is used to remove debris and sealife from SW side?

Back 32

Strainers

Front 33

How does a typical electronic heat exchanger function?

Back 33

Transfer heat from one fluid(DW) to another (coolant).