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refrigeration n that > refrigeration and ventilation > Flashcards

refrigeration and ventilation Flashcards

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)

A

phase out the use of cfc gass

24
Q

what causes ozone depletion (3)

A

cfc
hcfc
halons

25
Q

what is kyoto summit (1)

A

limit and reduce green house gasses

26
Q

what is infra red leak detection system irlds (2)

A

senses atmosphere at various points around machinary and system pipework
control point outside compartment

27
Q

what are oil slicks (1)

A

white deck plates to show if any oil leakage

28
Q

what is spectolyne dye and uv lamp (2)

A

dye added to oil
use of uv lamp to detect leaks

29
Q

what is snoop (2)

A

soapy demineralised water
applied to suspect areas and leaks will show up as bubbles

30
Q

what is a halogen leak detecor (3)

A

hand held device
detects refrigeration leaks electronically
extremely sensitive

31
Q

what is om70 (1)

A

general purpose

32
Q

what is suniso 3gs oil (2)

A

synthetic oil used in t23s and tboats

33
Q

what is sw68 (1)

A

R134A refrigeraants

34
Q

what does hydroscopic mean (1)

A

readily absorbs moisture

35
Q

what are the 3 ways to add oil to a sump (3)

A

sump filler
hand pump
dosing pot

36
Q

what are chilled water plants used for (4)

A

weapon systems
radars
ships computer system
air treatment units

37
Q

what does chilled water leave and return from the plant at (2)

A

leaved at 4-6
returns at 13-20

38
Q

what are the steps before entering a refrigeration plant (8)

A

tell someone where you are
breathing apperatus running
fans running
no smoking
irdls working
warning lights working
have a sentry
door mechanism working

39
Q

what is fan supply and fan exhaust and where do you find it (5)

A

using a fan to ventilate a compartment blowing in and out
wcs
bathrooms
laundries
machinery spaces

40
Q

what is fan supply and natural exhaust and where do you find it (3)

A

using a fan to blow in and letting it naturally disapate
store rooms
workshops

41
Q

what is natural supply and fan exhaust and where do you find it (4)

A

nothing to blow air in but using a fan to bring it out
paint stores
spirit rooms
inflam stores

42
Q

what is natural supply and natural exhaust (2)

A

using nothing to ventilate
minor occupied compartments and lobbies

43
Q

what kind of filters do you get (6)

A

panel
supply
grease
lint
dust
flamproof gauzes

44
Q

where requires speacial filters (5)

A

galleys
store rooms
auxiliary machinery spaces
magazines
paint stores

45
Q

where are fire flaps found (3)

A

galleys
main machinery spaces
magazines

46
Q

how many air changes to stps require
(1)

A

15 an hour

47
Q

what do magazines require (1)

A

100% treated fresh air

48
Q

in a basic ac cycle what percentage of air is drawn in and recirc (2)

A

33% drawn in
67% recirc

49
Q

what are the types of air filtration units (3)

A

nbc no6 mk1
nbc no7 mk1
no3 mk1

50
Q

in afu sections what are pre particulate filters (1)

A

paper filters
removes course particlulate

51
Q

in afu sections what is a particulate filter (2)

A

fiber glass
removes bacteria

52
Q

in afu sections what are gas filters (2)

A

removes all chemical warfare agents
active charcoal filtering

53
Q

when do you do a citidel test (5)

A

annually
prior to DED
during HATS
during SATS
during FOST work up

54
Q

how do you do a citidel test (5)

A

close all openings
open and start afu
restrict access
search fir leaks
record results in SEF and D171 part 2

55
Q

what is a crash stop and where is it (2)

A

built into ventilation system to stop fans incase of emergency
in HQ1/SCC

56
Q

before a restart what do you do (1)

A

check vents are clear

refrigeration n that (3 decks)

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