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2nd Year Finals Flashcards

(65 cards)

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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
useful refrigerating effect equal to 211 KJ/min or 12000BTU/hr
ton of refrigeration
26
specific refrigerating machine combination for a given refrigerant
condensing unit
27
evaporator constructed with a pipe or tubing
expansion coil
28
device equipped with heating element
generator
29
equipment including: compressor, condenser, generator, evaporator, etc.
air conditioning machinery
30
type of system used for small installation such as residences
unit air conditioner
31
aircon system used for large installations with the use of ducts
centralized type air conditioning system
32
structure usually on the roof in which water is circulated so as to cool it
cooling tower
33
ratio of annual fuel output energy to annual input energy
AFUE annual fuel utilization effieciency
34
the ratio of heat removal/delivered to the rate of the energy input
COP (coefficient of performance)
35
ratio of net equipment cooling capacity in BTU/hr to the total rate of electric imput in watts
EER energy efficiency ratio
36
single number figure of merit based on part-load EER or COP
IPLV integrated part load value
37
total cooling output of an aircon during its normal annual usage divided by the total energy input
SEER seasonal energy efficiency ratio
38
transfer of heat from one place of higher temp to lower temp
conduction
39
transfer of heat by motion of the particles
convection
40
process of transmittin rays of heat through the air
radiation
41
comfortable cooling temperature
68-74 Fahrenheit
42
based upon the alternate liquefying and evaporating of a volatile liquid refrigerant with a low boiling point
mechanical refrigeration
43
self-contained unit which houses all the necessary air conditining components such as the compressor condenser evaporator
unitary/ room airconditioner
44
unitary type ac is composed of the ff:
fan coil unit, air cooled condensing unit ACCU
45
fan coil unit FCU is composed of the ff:
fan, coil, filter
46
ACCU is comprised of the ff:
air cooled condenser ACC, compressor
47
ACC is composed of the ff:
ACC fan, condensing coil
48
commonly known as piston type compressor
reciprocating type
49
defined as the simultaneous control of air temp, humidity, motino, and purity or air in a confined space
air conditioning
50
used for humidifying and cleaning the air
air washer
51
power unit to raise and lower an elevator
drive machine
52
grooved wheel of a traction-type machine over which the hoist rope motion is imparted to the car
drive sheave
53
average time between departure of cars from the lobby
interval or lobby dispatch time
54
waiting time at an upper after registering a call
registration time
55
an electric device that is designed to interpret input conditions
relay
56
group of floors
zone
57
elevator with cables fastened to and would around a drum
winding drum machine
58
consists of a dc motor, shaft directly connected to the break wheel and driving sheave
gearless traction machine
59
the power from the motor is transmitted through reduction gears
geared traction machine
60
used to guide rails
guide shoes
61
ropes that hang from the bottom of the car to the bottom of the counterweight
compensator
62
carries current to and from the car
brush
63
causes car and counterweight to stop in case of emergency
governor
64
gives stability to a governor rope
tension sheave
65
18" above or below landing
landing zone

BU (2 decks)

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