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Refrigeration 1st Year > Refrigeration Principles TERMS (140102a) > Flashcards

Refrigeration Principles TERMS (140102a) Flashcards

1
Q

British Thermal Unit

A

The Heat Energy Unit of the imperial measurement system and the amount of heat required to raise the temperature of one pound of water one Fahrenheit degree.

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2
Q

Superheating

A

Increasing the temperature of a vapour above its saturated pressure.

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3
Q

Back Pressure

A

The low pressure of a refrigeration system. Also called low side pressure and evaporator pressure.

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4
Q

Sil-Fos Silvabrite Solder

A

Melting Point: 430*F

Flow: 430*F

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5
Q

TQSpecific Density

A

The ratio of a substance’s mass to the density of a given reference substance (usually water) at a given volume.

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6
Q

Head pressure

A

The high pressure on a normal refrigeration system, also called high side, condenser or discharge pressure.

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7
Q

Low side pressure

A

The low-pressure side of a refrigeration system. It aid also called LOW SIDE, SUCTION or EVAPORATOR PRESSURE

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8
Q

Adiabatic Compression

A

The Compression of refrigerant gas without removing or adding heat

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9
Q

Hydrometer

A

An instrument that measures the specific gravity of a liquid.

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10
Q

Gas

A

An invisible state in which a substance attempts to fill its surrounding space; also called VAPOUR

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11
Q

Refrigeration System

A

A combination of interconnected parts forming a closed circuit in which refrigeration is circulated for the purpose of extracting then rejecting heat.

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12
Q

Enthalpy

A

The heat in 1 POUND (lb) or KILOGRAM (kg) of a substance from a zero base point at -40* (F or C)

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13
Q

Sil-Fos 15

A

Melting Point: 1190*F

Flow: 1475*

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14
Q

Refrigerant

A

A liquid that absorbs heat while evaporating and expels heat while condensing, both at useful temperatures.

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15
Q

Laminar Flow

A

The smooth undisturbed flow of a fluid within a duct or pipe.

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16
Q

TQ Question

1: ) TON of refrigeration
2. ) How many BTU/24hrs in 1 TON of refrigeration?

A

1.) A measurement of refrigeration capacity based on the melting of one ton of ice in one day. One ton of refrigeration equals

2.) 288,000 BTU/24hrs
Or 12,000 BTU/Hr
Or 200 BTU/min

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17
Q

Melting point

A

The temperature at which solids melt.

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18
Q

Hydrostatic Pressure

A

The force applied by a liquid over an area.

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19
Q

Kilopascal

A

The SI unit of pressure based on the Pascal. The Kilopascal is 1000 pascals.

Symbol: kPa.

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20
Q

Reclaim

A

Returning recovered refrigerant to design characteristics by a refrigerant manufacturer.

Cleaning

“We don’t reclaim as techs, we recover”

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21
Q

Kelvin

A

A temperature scale starting at absolute zero, Kelvin Degrees is the same magnitude at Celsius degrees.

Symbol: K

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22
Q

Sublimation

A

A change of state from solid directly to a vapour without having a liquid state.

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23
Q

Specific Volume

A

The amount of space required for a unit of mass of a substance

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24
Q

Absolute temperature

A

System temperature measurement based on either a starting or a zero point where there is no heat or molecular motion theoretically stops.

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25
Q

Adiabatic Process

A

A change in pressure, volume and temperature of a vapour without a change in that vapour’s heat content

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26
Q

Hygrometer

A

An instrument that measures the quantity of H20 in a substance.

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27
Q

Saturation pressure

A

At a given temperature, the pressure at which vapour and liquid can exist in equilibrium.

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28
Q

Recycle

A

The process of cleaning recovered refrigerant (using a filter) in a posta me recycling unit on a job site or in a shop.

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29
Q

Ozone (o3)

A

A molecule composed of three oxygen atoms. Ozone filters harmful ultraviolet solar radiation in the ozone layer, but is a pollutant at ground level.

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30
Q

Micron

A

One millionth of a metre.

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31
Q

Temperature

A

Average level of molecule motion.

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32
Q

Manometer

A

A pressure measuring instrument that is based on liquid movement due to applied gas pressure.

33
Q

Work

A

The result of applying a force through a distance.

34
Q

Sil-Fos 5

A

Melting Point: 1190*F

Flow: 1495*F

35
Q

Matter

A

Any form that takes up space and has a mass

36
Q

Revolutions per minute. (RPM)

A

The number of times a shaft will completely revolve in one minute.

Symbol: RPM

37
Q

Refrigerating effect

A

The act of removing Heat by any means that reduces the temperature of mass.

38
Q

Saturation

A

A mixed condition where one substance holds as much of another substance as possible at a given temperature

39
Q

Density

A

The Ratio is MASS and VOLUME. The weight per unit volume of substance.

40
Q

Evaporation

A

The process of a liquid changing to a Vapour due to an addition of heat energy and a change in Vapour pressure.

41
Q

Recovery

A

The removal of refrigerant from mechanical refrigeration or air conditioning systems.

42
Q

Dry Bulb Temperature

A

The SENSIBLE temperature of the air determined with a dry thermometer.

43
Q

Sil-Fos 5

A

5% Silver
89% Copper
6% Phos

44
Q

Pressure

A

Forced applied over an area

45
Q

Heat

A

Thermal energy in the form of molecular motion.

46
Q

Saturated Vapour

A

In refrigeration, a vapour that contains as much of a liquid of the same substance as it can hold.

47
Q

High side

A

The portions of a refrigerating system that are subject to condensing pressure.

48
Q

Convection

A

Heat transferred through FLUIDS by the movement of currents. The fluid becomes lighter and is affected by gravity.

49
Q

Mass

A

The quality that gives an object shape and gravitational weight.

50
Q

Saturation Temperature

A

At a given pressure, the temperature at which vapour and liquid can exist in equilibrium.

51
Q

Newton

Definition and Symbol

A

The force accelerating 1kg of mass at a rate of 1m per second squared.

Symbol: N

52
Q

Specific Volume

A

The amount of space required for a unit

53
Q

Subcool

A

To lower the temperature of a liquid while it remains at its condensing or saturated pressure.

54
Q

Absolute Pressure

A

A system of pressure measurement with a starting position in a perfect vacuum.

Absolute is ZERO lbs/square inch.

55
Q

Saturated Liquid

A

In refrigeration, a liquid that contains as much of a Vapour of the same substance as it can hold.

56
Q

Sensible heat change

A

A change in a mass’ heat quantity caused by a rise or fall in temperature of that mass.

57
Q

Threshold limit Value (TLV)

A

The refrigerant concentration in air for a normal eight hour workday and 40 hour workweek to which nearly all workers may be repeatedly exposed, day after day, without adverse effect.

Note: TLV is a registered trademark of the American conference of government industrial Hygienists. (ACGIH)

58
Q

Radiation

A

Heat transferred through vacuums.

59
Q

IDLH

A

Immediately dangerous to life or health.

60
Q

Counter Flow

A

Two fluids flowing near each other in opposite directions.

61
Q

Low side

A

The low-pressure side of a refrigeration system. It is also referred to as the SUCTION SIDE

62
Q

TQ**Specific gravity**

A

A ratio of a substances density divided by water density at 4C (39F)

63
Q

Silvabrite Sil-Fos Solder

A

96% Tin

4% Silver

64
Q

Suction side

A

The low pressure of a refrigeration system. Also called low side pressure, back or evaporator pressure.

65
Q

Joule

Definition and Symbol

A

The amount of work done by a force of 1 NEWTON (N) over a distance of 1m

Symbol: J

66
Q

Suction pressure

A

The low pressure of a refrigeration system. Also called back pressure or evaporator pressure.

67
Q

Cross Flow

A

Two fluids flowing near each other at right angles to each other

68
Q

What change of state is;

  1. ) Melting
  2. ) Freezing
  3. ) Evaporating
  4. ) Condensing
  5. ) Sublimating
A
  1. ) Solid To Liquid
  2. ) Liquid to Solid
  3. ) Liquid to Vapor
  4. ) Vapour To Liquid
  5. ) Solid To Vapour
69
Q

Energy

A

The ability to perform work

70
Q

Force

A

The creator of motion or acceleration

71
Q

Superheat

A

Heat added to a vapour at its saturated pressure.

72
Q

Sil-Fos 15

A

15% Silver
80% Copper
5% Phos

73
Q

Kinetic energy

A

Energy based in motion.

74
Q

Humidity

A

The total water content of a specified air sample. Also the % of water air can hold.

75
Q

Latent Heat

A

Non-measurable heat gained or lost with no temperature change

Changes state.

76
Q

Entropy

A

A measurement of energy transfer where the energy is moved but not used to do work.

77
Q

Subcooling

A

The difference between the temperature at which a liquid is formed from vapour and the measured temperature of that liquid if it remains at its condensing or saturated pressure

78
Q

Static pressure

A

The pressure exerted by stationary air

79
Q

Superheat

A

Heat added to a vapour at its saturated pressure.

Refrigeration 1st Year (6 decks)

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