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Theory 4 Refrigeration > Refrigeration > Flashcards

Refrigeration Flashcards

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WSET ® Level 4 D2 Business of Wine flashcards
1
Q

Name the 3 types of heat transfer

A
  1. Radiation
  2. Convection
  3. Conduction
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2
Q

Describe conduction

A

The transfer of heat between two solid bodies
Eg: Cooking

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3
Q

Describe Convection

A

Transfer of heat between a solid body & a gas or liquid
Eg:Radiators

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4
Q

Describe Radiation

A

Energy transfered by electromagnetic radiation
Eg: The sun , Campfire

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5
Q

Heat will always…?

A

Go from HOT to COLD

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6
Q

Name the 4 on-board refridgeration plants

A

**1. COLD ROOM (Freezer) -18 to -22 degrees
2. COOL ROOM (Fridge) +4 to + 6 degrees
3. FRUIT & VEG STORE +4 to +6
4. GALLEY READY USE CUPBOARD +5 to +7

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7
Q

Increasing pressure increases?

A

Boiling point

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8
Q

Decreasing pressure decreases?

A

Boiling point

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9
Q

On a Sight glass indicator Green & Yellow indicate?

A

Green = Dry
Yellow = Wet

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10
Q

Describe * Natural defrosting*

A
  • Turn off electrics
  • Done every 3-6 months
  • Air melts the ice
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11
Q

Describe Hot gas defrosting

A
  • Done using hot vapor passed through evaporator
  • 1 hour a day 4x15 mins
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12
Q

Defrosting methods

Describe the Electrical heating coils defrosting method

A
  • A wrap around
  • Done for 1 hour
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13
Q

What is the Montreal Protocol 1987 about?

A

CFC gases

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14
Q

What was the Kyoto summit 1997 about?

A

Limiting greenhouse gases

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15
Q

What is Sensible heat?

A

The heat required to change temp not the state of a substance

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16
Q

What is Latent heat?

A

Heat that changes the state of a substance without changing temperature

17
Q

What is Superheat?

A

When a substance goes above its boiling point

18
Q

Name the 5 methods of testing systems for leakage

A
  1. Infrared
  2. Oil slicks
  3. Spectrodyne
  4. Snoop
  5. Halogen detector
19
Q

What are the 3 oils used in refridgeration?

A
  1. OM70 - Gen purpose
  2. SUNISO - Type 23’s & T-Boats
  3. SW68- R134A
20
Q

When you refill your refrigeration oil sump you should..

A

Use a fresh can of oil,

21
Q

Refridgeration Oil

What are the 3 methods to adding oil to the sump?

A
  1. Sump filler plug
  2. Hand pump
  3. Dosing pot
22
Q

Refridgerant hazard

Chilled water provides cooling for?

A
  • Weapons
  • Radar
  • Computer systems
  • Air treatment unit (ATU)
23
Q

What gas is produced if refridgerant gets too hot?

A

Phosgene gas

24
Q

What is the hazard of fruit and veg stores?

A

As it rots it produces C02

25
Q

What are the procedures for entering the refridgeration machinery room?

A
  1. Rating in charge informed
  2. B/A available
  3. Exhaust fans are on
  4. No smoking
  5. Infrared is working
  6. Warning lights are on
  7. Have a sentry
  8. Door can open & close

Theory 4 Refrigeration (5 decks)

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