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BU > 2nd Year Finals > Flashcards

2nd Year Finals Flashcards

1
Q

form of energy that is transformed by temp difference

A

heat

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2
Q

quantity of heat in BTU/min in a fluid or gas

A

enthalpy

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3
Q

a heat exchange device in a refrigeration system

A

condenser

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4
Q

machine for drawing refrigerant from the evaporator at a relatively low pressure, compresses it then discharges it

A

compressor

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5
Q

part in which refrigerant is vaporized

A

evaporator

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6
Q

heat transmission by currents resulting from differences in density due to temperature differences

A

convection

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7
Q

water vapor within a confined space

A

humidity

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8
Q

ratio of the weight of water vapor actually in humid air to the max possible weight of water vapor that air could contain at the same temp

A

relative humidity

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9
Q

weight of water vapor in a mixture per pound of dry air

A

humidity ratio

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10
Q

regulatory device actuated by changes in humidity

A

humidistat/ hygrostat

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11
Q

device which responds to changes in temp

A

thermostat

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12
Q

introduction of water into an unsaturated air to increase humidity ratio but without transfer of heat

A

adiabatic saturation

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13
Q

temp in which air-water vapor mixture will become saturated and begins to yield drops of condensed water

A

dew point

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14
Q

amount of heat absorbed in changing the state of the substance without changing its temp

A

latent heat

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15
Q

one where change is from liquid to solid state

A

latent heat of fusion

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16
Q

one where change is from liquid to gas

A

latent heat of vaporization

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17
Q

heat in BTU absorbed by a substance in changing its temperature without changing its state

A

sensible heat

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18
Q

temp shown by a thermometer with a wetted bulb rotated rapidly in the air

A

wet bulb temperature

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19
Q

temp of air-water vapor mix as measured in the normal way with Fahrenheit thermometer

A

dry bulb temperature

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20
Q

an absorber that can remove water vapor from a material

A

desiccant

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21
Q

device used to vary the volume of air passing through an air outler

A

damper

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22
Q

substance that produces refrigerating effect by absorbing heat

A

refrigerant

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23
Q

synthetic chemical refrigerant

A

freon

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24
Q

process of supplying or removing air

A

ventilation

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25
Q

useful refrigerating effect equal to 211 KJ/min or 12000BTU/hr

A

ton of refrigeration

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26
Q

specific refrigerating machine combination for a given refrigerant

A

condensing unit

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27
Q

evaporator constructed with a pipe or tubing

A

expansion coil

28
Q

device equipped with heating element

A

generator

29
Q

equipment including: compressor, condenser, generator, evaporator, etc.

A

air conditioning machinery

30
Q

type of system used for small installation such as residences

A

unit air conditioner

31
Q

aircon system used for large installations with the use of ducts

A

centralized type air conditioning system

32
Q

structure usually on the roof in which water is circulated so as to cool it

A

cooling tower

33
Q

ratio of annual fuel output energy to annual input energy

A

AFUE annual fuel utilization effieciency

34
Q

the ratio of heat removal/delivered to the rate of the energy input

A

COP (coefficient of performance)

35
Q

ratio of net equipment cooling capacity in BTU/hr to the total rate of electric imput in watts

A

EER energy efficiency ratio

36
Q

single number figure of merit based on part-load EER or COP

A

IPLV integrated part load value

37
Q

total cooling output of an aircon during its normal annual usage divided by the total energy input

A

SEER seasonal energy efficiency ratio

38
Q

transfer of heat from one place of higher temp to lower temp

A

conduction

39
Q

transfer of heat by motion of the particles

A

convection

40
Q

process of transmittin rays of heat through the air

A

radiation

41
Q

comfortable cooling temperature

A

68-74 Fahrenheit

42
Q

based upon the alternate liquefying and evaporating of a volatile liquid refrigerant with a low boiling point

A

mechanical refrigeration

43
Q

self-contained unit which houses all the necessary air conditining components such as the compressor condenser evaporator

A

unitary/ room airconditioner

44
Q

unitary type ac is composed of the ff:

A

fan coil unit, air cooled condensing unit ACCU

45
Q

fan coil unit FCU is composed of the ff:

A

fan, coil, filter

46
Q

ACCU is comprised of the ff:

A

air cooled condenser ACC, compressor

47
Q

ACC is composed of the ff:

A

ACC fan, condensing coil

48
Q

commonly known as piston type compressor

A

reciprocating type

49
Q

defined as the simultaneous control of air temp, humidity, motino, and purity or air in a confined space

A

air conditioning

50
Q

used for humidifying and cleaning the air

A

air washer

51
Q

power unit to raise and lower an elevator

A

drive machine

52
Q

grooved wheel of a traction-type machine over which the hoist rope motion is imparted to the car

A

drive sheave

53
Q

average time between departure of cars from the lobby

A

interval or lobby dispatch time

54
Q

waiting time at an upper after registering a call

A

registration time

55
Q

an electric device that is designed to interpret input conditions

A

relay

56
Q

group of floors

A

zone

57
Q

elevator with cables fastened to and would around a drum

A

winding drum machine

58
Q

consists of a dc motor, shaft directly connected to the break wheel and driving sheave

A

gearless traction machine

59
Q

the power from the motor is transmitted through reduction gears

A

geared traction machine

60
Q

used to guide rails

A

guide shoes

61
Q

ropes that hang from the bottom of the car to the bottom of the counterweight

A

compensator

62
Q

carries current to and from the car

A

brush

63
Q

causes car and counterweight to stop in case of emergency

A

governor

64
Q

gives stability to a governor rope

A

tension sheave

65
Q

18” above or below landing

A

landing zone

BU (2 decks)

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