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refrigeration n that > refrigeration and ventilation > Flashcards

refrigeration and ventilation Flashcards

(56 cards)

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1
Q

what is a cold room

A

freezer

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2
Q

what is a cool room (1)

A

fridge

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3
Q

what happens to the boiling point of water if you in crease and decrease the pressure acting apon it (2)

A

when you increase the pressure water boils at a higher temperature
when you decrease the pressure water boils at a lower temp

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4
Q

describe and name the 3 ways of moving heat (3)

A

conduction- heat transferred by direct contact
convection- heat transferred by air
radiation- heat transferred by radiation

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5
Q

give examples of the 3 ways of moving heat (3)

A

conduction- touching a hot stove
convection- a radiator
radiation- the sun

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6
Q

what states to materials exist in (3)

A

liquid, solid, gas

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7
Q

what is sensible heat (1)

A

where the state if matter isn’t changing but heat is

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8
Q

what is latent heat (1)

A

change in state without change in temp

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9
Q

what is super heat (1)

A

any agree above 100 degrees
101 degrees = 1 degree of super heat

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10
Q

what temp is a cold room (1)

A

-18 to -22 degrees

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11
Q

what temp is a cool room (1)

A

4-6 degrees

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12
Q

what temp is a fruit and veg store (1)

A

4-6 degrees

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13
Q

what temp is a gally ready use cupboard (1)

A

5-7 degrees

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14
Q

what does a compressor do in the refrigerator cycle (2)

A

provides motive force
turns lp gas to hp gas

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15
Q

what does a condenser do in the refrigerator cycle (2)

A

uses salt water to cool the gas
turns the hp gas to hp liquid

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16
Q

what does a tev do in the refrigeration cycle (3)

A

thermal expansion valve
turns hp liquid into lp liquid
senses the temp of refrigerant leaving evaporater using a liquid line stop valve

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17
Q

what does a evaporator do in the refrigerator cycle (1)

A

turns lp liquid to lp gas

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18
Q

what is sub cooling

A

cooling down from a gas/vapor to a liquid

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19
Q

what do the colours mean in the sight glass indicator (2)

A

green- dry
yellow- moisture

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20
Q

explain natural defrosting (3)

A

turning everything off
de- store
do it every 3-6 months

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21
Q

explain hot gas defrosting (2)

A

passing a hp gass through coils
max 1 hour a day for 15 minute intervals

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22
Q

explain electric heating coils (2)

A

rod wrapped around coils
max 1 hour a day

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23
Q

what is the montreal protocol 1987 (1)

Study These Flashcards
A

phase out the use of cfc gass

24
Q

what causes ozone depletion (3)

Study These Flashcards
A

cfc
hcfc
halons

25
what is kyoto summit (1)
limit and reduce green house gasses
26
what is infra red leak detection system irlds (2)
senses atmosphere at various points around machinary and system pipework control point outside compartment
27
what are oil slicks (1)
white deck plates to show if any oil leakage
28
what is spectolyne dye and uv lamp (2)
dye added to oil use of uv lamp to detect leaks
29
what is snoop (2)
soapy demineralised water applied to suspect areas and leaks will show up as bubbles
30
what is a halogen leak detecor (3)
hand held device detects refrigeration leaks electronically extremely sensitive
31
what is om70 (1)
general purpose
32
what is suniso 3gs oil (2)
synthetic oil used in t23s and tboats
33
what is sw68 (1)
R134A refrigeraants
34
what does hydroscopic mean (1)
readily absorbs moisture
35
what are the 3 ways to add oil to a sump (3)
sump filler hand pump dosing pot
36
what are chilled water plants used for (4)
weapon systems radars ships computer system air treatment units
37
what does chilled water leave and return from the plant at (2)
leaved at 4-6 returns at 13-20
38
what are the steps before entering a refrigeration plant (8)
tell someone where you are breathing apperatus running fans running no smoking irdls working warning lights working have a sentry door mechanism working
39
what is fan supply and fan exhaust and where do you find it (5)
using a fan to ventilate a compartment blowing in and out wcs bathrooms laundries machinery spaces
40
what is fan supply and natural exhaust and where do you find it (3)
using a fan to blow in and letting it naturally disapate store rooms workshops
41
what is natural supply and fan exhaust and where do you find it (4)
nothing to blow air in but using a fan to bring it out paint stores spirit rooms inflam stores
42
what is natural supply and natural exhaust (2)
using nothing to ventilate minor occupied compartments and lobbies
43
what kind of filters do you get (6)
panel supply grease lint dust flamproof gauzes
44
where requires speacial filters (5)
galleys store rooms auxiliary machinery spaces magazines paint stores
45
where are fire flaps found (3)
galleys main machinery spaces magazines
46
how many air changes to stps require (1)
15 an hour
47
what do magazines require (1)
100% treated fresh air
48
in a basic ac cycle what percentage of air is drawn in and recirc (2)
33% drawn in 67% recirc
49
what are the types of air filtration units (3)
nbc no6 mk1 nbc no7 mk1 no3 mk1
50
in afu sections what are pre particulate filters (1)
paper filters removes course particlulate
51
in afu sections what is a particulate filter (2)
fiber glass removes bacteria
52
in afu sections what are gas filters (2)
removes all chemical warfare agents active charcoal filtering
53
when do you do a citidel test (5)
annually prior to DED during HATS during SATS during FOST work up
54
how do you do a citidel test (5)
close all openings open and start afu restrict access search fir leaks record results in SEF and D171 part 2
55
what is a crash stop and where is it (2)
built into ventilation system to stop fans incase of emergency in HQ1/SCC
56
before a restart what do you do (1)
check vents are clear

refrigeration n that (3 decks)

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