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Use this Construction/HVAC Glossary to answer the
questions below.
- · ABSOLUTE
HUMIDITY - The weight of water vapor in a given amount of air.
- · ABSOLUTE
PRESSURE - Pressure measured with the base of zero.
- · ABSOLUTE
TEMPERATURE - A temperature scale expressed in degrees oF
or oC using absolute zero as a base.
Referred to as the Rankin or Kelvin scale.
- · ABSOLUTE
ZERO - The temperature at which molecular activity theoretically ceases.
-456.69 F0 or -273.16 oC.
- · AIR
CONDITIONING - The process of controlling the temperature, humidity, cleanliness
and distribution of the air.
- · AIR,
Conditions at which capacity ratings for air conditioning equipment is
rated.
- · AMBIENT
- Refers to the temperature surrounding a body or unit under test.
- · ATMOSPHERIC
PRESSURE - The weight of a 1 unit column of the earth's atmosphere.
- · BIMETAL
- Two metals with different rates of expansion fastened together. When
heated or cooled they will warp and can be made to open or close a switch
or valve.
- · BOILING
POINT - The temperature at which the addition of any heat will begin a
change of state from a liquid to a vapor.
- · BRITISH
THERMAL UNIT (BTU) - The amount of heat necessary to change the
temperature of 1 pound of pure water 1 degree Fahrenheit (oF).
- · CAPILLARY
TUBE - A refrigerant control consisting of a small diameter tube which
controls flow by restriction. They are carefully sized by inside diameter
and length for each particular application.
- · CENTIGRADE
- A temperature scale with the freezing point of water 0 oC
and the boiling point 100 oC at sea level.
- · CHECK
VALVE - A valve designed to permit flow in one direction only.
- · COMPRESSION
- The reduction of volume of a vapor or gas by mechanical means.
- · COMPRESSION
RATIO - The ratio determined by dividing the discharge pressure, in PSI
(Pa), by the suction pressure in PSI (Pa).
- · COMPRESSOR
- A mechanical device used to compress gases. Three main types -
reciprocating, centrifugal and rotary.
- · CONDENSATION
POINT - The temperature at which the removal of any heat will begin a change
of state from a vapor to a liquid.
- · CONDENSING
MEDIUM - The substance, usually air or water, to which the heat in a
condenser is transferred.
- · CONDENSING
UNIT - The portion of a refrigeration system where the compression and
condensation of refrigerant is accomplished. Sometimes referred to as the
'high side'.
- · CONDUCTION
- The transfer of heat from molecule to molecule within a substance.
- · CONTACTOR
- An electromagnetic actuated relay. Usually used to refer to the relay which
closes the circuit to a compressor.
- · CONVECTION
- The transfer of heat by a moving fluid.
- · COOLING
ANTICIPATOR - A resistance heater (usually not adjustable) in parallel
with the cooling circuit. It is 'on' when the current is 'off",
adding heat to shorten the off cycle.
- · COP -
Ratio of work performed or accomplished as compared to the energy used.
- · CUBIC
FEET PER MINUTE - A common means of assigning quantitative values to
volumes of air in transit, usually abbreviated CFM.
- · CYCLE -
The complete course of operation of a refrigerant back to a selected
starting point in a system.
- · DENSITY
- Mass or weight per unit of volume.
- · DISCHARGE
LINE - A tube used to convey the compressed refrigerant vapor from the
compressor to the condenser inlet.
- · DISCHARGE
PRESSURE - The pressure read at the compressor outlet. Also called head
pressure or high side pressure.
- · DRY AIR
- Air which contains no moisture vapor.
- · DRY
BULB TEMPERATURE - Temperature read with an ordinary thermometer.
- · EFFECTIVE
TEMPERATURE - An arbitrary concept which combines into a single value the
effect of temperature, humidity, and air movement as sensed by the human
body.
- · ENTHALPY
- Total amount of heat in one pound (kg) of a substance calculated from accepted
temperature base, expressed in BTU's per pound mass (J/kg).
- · EQUIVALENT LENGTH - That length
of straight tubing which has the same pressure drop as the fitting, valve
or accessory (of the same nominal size) being considered.
- · EVAPORATIVE
COOLING - The cooling effect of vaporization of a liquid in a moving air
stream.
- · EVAPORATOR
- A device in which a liquid refrigerant is vaporized. Some superheating
usually takes place.
- · EVAPORATOR
SUPERHEAT - The actual temperature of the refrigerant vapor at the
evaporator exit as compared to the saturated vapor temperature indicated
by the suction pressure.
- · EXTERNAL
STATIC PRESSURE - The sum of the static and velocity pressures of a moving
air system at the point of measurement.
- · FAHRENHEIT
- A temperature scale with the freezing point of water 320 F
and the boiling point 2120 F at sea level.
- · FEET
PER MINUTE - A term assigned to a velocity of a moving air stream, usually
express FPM.
- · FILTER-DRIER
- A device that removes moisture, acid and foreign matter from the
refrigerant.
- · FLASH
GAS - Instantaneous evaporation of some liquid refrigerant at the metering
device due to pressure drop which cools the remaining liquid refrigerant
to desired evaporation temperature.
- · FREEZING
POINT - The temperature at which the removal of any heat will begin a
change of state from a liquid to a solid.
- · GAUGE
PRESSURE - Pressure measured with atmospheric pressure as a base.
- · HEAT -
A form of energy causing the agitation of molecules within a substance.
- · HEAT
EXCHANGER - A device for the transfer of heat energy from the source to
the conveying medium.
- · HEAT
FLOW - Heat flows from a warmer to a cooler substance. The rate depends
upon the temperature difference, the area exposed and the type of material.
- · HEAT OF
COMPRESSION - The heat added to a vapor by the work done on it during
compression.
- · HEAT OF
THE LIQUID - The increase in total heat (Enthalpy) per pound of a
saturated liquid as its temperature is increased above a chosen base temperature.
(Usually - 400F for refrigerants).
- · HEAT
TRANSFER - The three methods of heat transfer are conduction, convection
and radiation.
- · INCHES
OF MERCURY - Atmospheric pressure is equal to 29.92 inches of mercury.
- · LATENT HEAT - Heat that produces
a change of state without a change in temperature; i.e., ice to water at
32 oF or water to steam at 212 oF.
- · LATENT
HEAT OF CONDENSATION - The amount of heat energy in BTU's that must be
removed to change the state of one pound of a vapor to one pound of liquid
at the same temperature.
- · LATENT
HEAT OF FUSION - The amount of heat energy, in BTU's required to change
the state of one pound of a liquid to one pound of solid at the same
temperature.
- · LATENT HEAT OF MELTING - The
amount of heat energy, in BTU'S, that must be removed to change the state
of one pound of solid to one pound of vapor at the same temperature.
- · LATENT
HEAT OF VAPORIZATION - The amount of heat energy in BTU's required to
change the state of one pound of a liquid to one pound of vapor at the
same temperature.
- · LIFT -
To elevate a fluid from one level to a higher level.
- · LIQUID
LINE - A tube used to convey the liquid refrigerant from the condenser
outlet to the refrigerant control device of the evaporator.
- · MANOMETER
- A tube filled with a liquid used to measure pressures.
- · MBH -
One MBH is equivalent to 1,000 BTU's per hour.
- · MEAN
TEMPERATURE DIFFERENCES - The mean of difference between the temperature
of a fluid receiving and a fluid yielding heat.
- · MELTING
POINT - The temperature at which the addition of any heat will begin a
change of state from a solid to a liquid.
- · MERCURY
MANOMETER - Used to measure vacuum in inches of mercury.
- · MICRON
- A unit used to measure high vacuums. One micron equals 1/25,400 of one
inch mercury.
- · MUFFLER
- Device installed in hot gas line to silence discharge surges.
- · OIL
SEPARATOR - A device for separating out oil entrained in the discharge gas
from the compressor and returning it to the crankcase.
- · PARTIAL
PRESSURE - The pressure exerted by any individual gas in a mixture.
- · PITCH -
The slope of a pipe line for the purpose of improving drainage.
- · PITOT TUBE - A device comprising
a small diameter orifice projecting directly into an air stream measuring
total pressure and surrounded by an annular section with small diameter
entrances normal to the flow, measuring static pressure; both sections are
usually connected to a manometer to indicate velocity pressure.
- · PRECHARGED
LINES - Refrigerant line's which are filled with refrigerant and are
sealed at both ends. The seals are broken when the lines are installed and
the line charge becomes part of the total system charge.
- · PRESSURE
DROP - The decrease in pressure due to friction of a fluid or vapor as it passes
through a tube or duct or/and lift.
- · PRESSURE
- TEMPERATURE RELATIONSHIP - The change effected in temperature when
pressure is changed or vice versa. Only used at saturated conditions. An
increase in pressure results in a temperature increase. A decrease in
temperature results in a pressure decrease.
- · PUMPDOWN - Process of pumping
refrigerant out of the evaporator and suction line at the end of the on-
cycle by closing a solenoid valve in the liquid line and letting the
compressor shut-off by the low pressure control.
- · PSYCHROMETER
- A devices having both a dry and wet bulb thermometer. It is used to
determine the relative humidity in a conditioned space. Most have an
indexed scale to allow direct conversion from the temperature readings to
the percentage of relative humidity.
- · PSYCHROMETRIC CHART - A chart on
which can be found the properties of air under varying conditions of
temperature, water vapor content, volume, etc.
- · QUICK
CONNECT - Name given to the end connections on precharged
lines which screw on to mated fittings of the outdoor and indoor sections.
Tightening the quick connections ruptures the seals on the fittings and
the line charge becomes part of the total system charge.
- · RADIATION
- The transfer of heat without an intervening medium. It is absorbed on
contact with a solid surface.
- · RECEIVER
- A vessel for holding refrigerant liquefied by the condenser.
- · REFRIGERANT
- A substance which produces a refrigerating effect while expanding or
vaporizing.
- · REFRIGERANT
CONTROL - A device used to meter the amount of refrigerant to an
evaporator. It also serves as a dividing point between the high and low
pressure sides of the system.
- · REFRIGERANT
DISTRIBUTOR - A device which meters equal quantities of refrigerant to
independent circuits in the evaporator coil.
- · REFRIGERANT
MIGRATION - The movement of refrigerant through the system to the
compressor crankcase during the off-cycle, caused by its attraction to
oil.
- · REFRIGERANT
OPERATING CHARGE - The total amount of refrigerant required by a a system for correct operation.
- · REFRIGERANT
VELOCITY - The rate at which refrigerant is moving at a given point in a
system, usually given in feet per minute (FPM).
- · REFRIGERATION
- The transfer of heat from a place where it is not wanted to a place
where its presence is not desirable.
- · REFRIGERATION
EFFECT - The amount of heat a given quantity of refrigerant will absorb in
changing from a liquid to a vapor at a given evaporating pressure.
- · RELATIVE
HUMIDITY - The percentage of water vapor present in a given quantity air
compared to the amount it can hold at its temperature.
- · RELAY -
A device used to open and close an electrical circuit. The relay may may be actuated by a bimetal electrically heated
strip, a rod wrapped with a fine resistance wire causing expansion when
energized, a bellows actuated by expansion of a fluid or gas or an
electromagnetic coil.
- · REVERSING VALVE - A device in a
heat pump that is electrically controlled to reverse the flow of
refrigerant as the system is switched from cooling to heating; also called
a four-way valve.
- · RISER -
A vertical tube or pipe which carries refrigerant in any form from a lower
to a higher level.
- · SATURATED
VAPOR - Vapor in contact with a liquid.
- · SATURATION
- A condition of stable equilibrium of a vapor and a liquid.
- · SENSIBLE
HEAT - Heat that can be measured or felt. Sensible heat always causes a
temperature rise.
- · SIGHT
GLASS - A glass installed in the liquid line permitting visual inspection
of the liquid refrigerant for the purpose of detecting vapor in the
liquid. They also generally have a device included to monitor moisture
content of the refrigerant.
- · SLUGGING
- A condition in which a quantity of liquid enters the compressor causing
hammering and possible compressor damage.
- · SPECIFIC
HEAT - VACUUM The amount of heat necessary to change the temperature of
one pound of a substance 10 F.
- SPECIFIC
VOLUME - The volume of a substance per unit of mass; i.e., standard air
13.33 cubic feet per pound. The reciprocal of density.
- · STANDARD
AIR DENSITY - .075 pounds per cubic foot. Equivalent to dry air at 700
F and at sea level pressure.
100.
· STATE CONDITION - Substances can exist
in three states - solid, liquid or vapor.
101.
· STATIC PRESSURE - The normal force per
unit area at a small hole in the wall of a duct.
102.
· STATIC TAP - A means by which static
pressures of a duct system may be read directly, usually consisting of a small
diameter hole in the side of the duct connected to a manometer.
103.
· SUB COOLING - Cooling of a liquid, at a
constant pressure, below the point at which it was condensed.
104.
· SUBLIMATION - A condition where a
substance changes from a solid to a gas without becoming a liquid.
105.
· SUCTION LINE - A tube used to convey
the refrigerant vapor from the evaporator outlet to the suction inlet of
compressor.
106.
· SUCTION LINE ACCUMULATOR - A device
located in the suction line that intercepts quantities of a liquid refrigerant
and thereby prevents damage to the compressor.
107.
· SUPERHEAT - Heat added to a vapor after
all liquid has been vaporized.
108.
· TEMPERATURE - A measurement of heat
intensity.
109.
· THERMISTOR - Basically a semiconductor
which has electrical resistance that varies inversely with temperature.
110.
· THERMOSTAT - A bimetal actuated switch
to close and open a circuit to indicate or terminate operation of a heating or
air conditioning system.
111.
· THERMOSTATIC EXPANSION VALVE -
Refrigerant control which monitors the flow rate according to the superheat at
the evaporator outlet.
112.
· TON OF REFRIGERATION - The amount of
heat necessary to completely melt one ton of 32oF ice in 24 hours.
113.
· TOTAL HEAT (Enthalpy) - Total heat
energy in a substance. The sum of sensible and latent heat.
114.
· TOTAL PRESSURE - The sum of all partial
pressures in a mixture of gases.
115.
· TRAP - A depression or dip in
refrigerant piping in which oil will collect. A trap may be placed at the base
of a suction or hot gas riser to improve oil return up the riser.
116.
· VACUUM - Any pressure below atmospheric
pressure.
117.
· VAPOR BARRIER - The term applied to an
impervious layer of material superimposed upon a layer of insulation. Vapor
barriers are always applied on the warm side of the insulation layer.
118.
· VAPOR PRESSURE - The pressure exerted
by vapor.
119.
· VELOCITY PRESSURE - In a moving fluid,
the pressure capable of causing an equivalent velocity as applied to move the
same fluid through an orifice such that all pressure energy expanded is
converted into kinetic energy.
120.
· WATER MANOMETER - Used to measure
pressure in inches of water.
121.
· WET BULB TEMPERATURE - Temperature read
with a thermometer whose bulb is encased in a wetted wick.
Match the definition to the correct word or phase
- The
total amount of refrigerant required by a system for correct operation.
- REFRIGERANT
OPERATING CHARGE
- REFRIGERANT
- REFRIGERANT
MIGRATION
- REFRIGERANT
DISTRIBUTOR
- A
device used to open and close an electrical circuit. The relay may be
actuated by a bimetal electrically heated strip, a rod wrapped with a fine
resistance wire causing expansion when energized, a bellows actuated by
expansion of a fluid or gas or an electromagnetic coil.
- RISER
- TRAP
- RELAY
- VACUUM
- In a
moving fluid, the pressure capable of causing an equivalent velocity as
applied to move the same fluid through an orifice such that all pressure
energy expanded is converted into kinetic energy.
- VELOCITY
PRESSURE
- GAUGE
PRESSURE
- VAPOR
PRESSURE
- VACUUM
- Process
of pumping refrigerant out of the evaporator and suction line at the end
of the on-cycle by closing a solenoid valve in the liquid line and letting
the compressor shut-off by the low pressure control.
- VELOCITY
PRESSURE
- PRESSURE
DROP
- VAPOR
PRESSURE
- PUMPDOWN
- A
temperature scale with the freezing point of water 320 F and
the boiling point 2120 F at sea level.
- FAHRENHEIT
- BRITISH
THERMAL UNIT
- CENTIGRADE
- LATENT
HEAT
- Heat
flows from a warmer to a cooler substance. The rate depends upon the
temperature difference, the area exposed and the type of material.
- HEAT
FLOW
- HEAT
OF COMPRESSION
- HEAT
OF THE LIQUID
- HEAT
TRANSFER
- One
______ is equivalent to 1,000 BTU's per hour.
- BTU
- COP
- MBH
- MICRON
- A
device which meters equal quantities of refrigerant to independent
circuits in the evaporator coil.
- REFRIGERANT
DISTRIBUTOR
- REFRIGERANT
MIGRATION
- REFRIGERANT
OPERATING CHARGE
- REFRIGERANT
VELOCITY
- The
substance, usually air or water, to which the heat in a condenser is
transferred.
- CONDENSING
UNIT
- CONDENSING
MEDIUM
- COMPRESSION
RATIO
- CONDENSATION
POINT
- The
amount of heat necessary to change the temperature of one pound of a
substance 10 F.
- VACUUM
- SPECIFIC
HEAT
- SPECIFIC
VOLUME
- VAPOR
PRESSURE
- That
length of straight tubing which has the same pressure drop as the fitting,
valve or accessory (of the same nominal size) being considered.
- EQUIVALENT
LENGTH
- EVAPORATIVE
COOLING
- EVAPORATOR
- EVAPORATOR
SUPERHEAT
- The
heat added to a vapor by the work done on it during compression.
- HEAT
FLOW
- HEAT
OF COMPRESSION
- HEAT
OF THE LIQUID
- HEAT
TRANSFER
- The
transfer of heat from a place where it is not wanted to a place where its
presence is not desirable.
- REFRIGERANT
DISTRIBUTOR
- REFRIGERATION
- REFRIGERANT
OPERATING CHARGE
- REFRIGERANT
VELOCITY
- The
sum of all partial pressures in a mixture of gases.
- BRITISH
THERMAL UNIT
- TOTAL
HEAT
- TOTAL
PRESSURE
- SUPERHEAT
- A
form of energy causing the agitation of molecules within a substance.
- HEAT
- HEAT
OF COMPRESSION
- HEAT
OF THE LIQUID
- HEAT
TRANSFER
- The
amount of heat energy, in BTU'S, that must be removed to change the state of
one pound of solid to one pound of vapor at the same temperature.
- LATENT
HEAT OF CONDENSATION
- LATENT
HEAT OF FUSION
- LATENT
HEAT OF MELTING
- LATENT
HEAT OF VAPORIZATION
- A
resistance heater (usually not adjustable) in parallel with the cooling
circuit. It is 'on' when the current is 'off", adding heat to shorten
the off cycle.
- COOLING
ANTICIPATOR
- AIR
CONDITIONING
- EVAPORATIVE
COOLING
- REFRIGERANT
- The
transfer of heat by a moving fluid.
- COMPRESSION
- CONDUCTION
- CONVECTION
- HEAT
FLOW
- The
change effected in temperature when pressure is changed or vice versa.
Only used at saturated conditions. An increase in pressure results in a
temperature increase. A decrease in temperature results in a pressure
decrease.
- VELOCITY
PRESSURE
- PRESSURE
DROP
- VAPOR
PRESSURE
- PRESSURE
- TEMPERATURE RELATIONSHIP
- Cooling
of a liquid, at a constant pressure, below the point at which it was
condensed.
- FREEZING
POINT
- STATE
CONDITION
- SUB
COOLING
- TON
OF REFRIGERATION
- A
measurement of heat intensity.
- TEMPERATURE
- FAHRENHEIT
- WET
BULB TEMPERATURE
- EFFECTIVE
TEMPERATURE
- The
movement of refrigerant through the system to the compressor crankcase
during the off-cycle, caused by its attraction to oil.
- REFRIGERANT
DISTRIBUTOR
- REFRIGERANT
MIGRATION
- REFRIGERANT
OPERATING CHARGE
- REFRIGERANT
VELOCITY
- A
valve designed to permit flow in one direction only.
- CHECK
VALVE
- CAPILLARY
TUBE
- CONTACTOR
- COMPRESSOR
- The
normal force per unit area at a small hole in the wall of a duct.
- STATIC
TAP
- STATIC
PRESSURE
- SATURATION
- PRESSURE
DROP
- A vertical
tube or pipe which carries refrigerant in any form from a lower to a
higher level.
- RISER
- TRAP
- PITCH
- LIFT
- The
amount of heat energy, in BTU's required to change
the state of one pound of a liquid to one pound of solid at the same
temperature.
- LATENT
HEAT OF CONDENSATION
- LATENT
HEAT OF FUSION
- LATENT
HEAT OF MELTING
- LATENT
HEAT OF VAPORIZATION
- A
device used to meter the amount of refrigerant to an evaporator. It also
serves as a dividing point between the high and low pressure sides of the
system.
- REFRIGERANT
CONTROL
- REFRIGERANT
OPERATING CHARGE
- REFRIGERATION
- REFRIGERANT
MIGRATION
- Refrigerant
line's which are filled with refrigerant and are sealed at both ends. The
seals are broken when the lines are installed and the line charge becomes
part of the total system charge.
- PRESSURE
DROP
- PRECHARGED
LINES
- WATER
MANOMETER
- VACUUM
- An
electromagnetic actuated relay. Usually used to refer to the relay which
closes the circuit to a compressor.
- CHECK
VALVE
- CAPILLARY
TUBE
- CONTACTOR
- COMPRESSOR
- Atmospheric
pressure is equal to 29.92 inches of mercury.
- LATENT
HEAT OF MELTING
- WATER
MANOMETER
- WET
BULB TEMPERATURE
- INCHES
OF MERCURY
- The
sum of sensible and latent heat.
- BRITISH
THERMAL UNIT
- TOTAL
HEAT
- TOTAL
PRESSURE
- SUPERHEAT
- The
amount of heat energy in BTU's required to change
the state of one pound of a liquid to one pound of vapor at the same
temperature.
- LATENT
HEAT OF CONDENSATION
- LATENT
HEAT OF FUSION
- LATENT
HEAT OF MELTING
- LATENT
HEAT OF VAPORIZATION
- Heat
that can be measured or felt. Sensible heat always causes a temperature
rise.
- HEAT
FLOW
- HEAT
TRANSFER
- SENSIBLE
HEAT
- HEAT
- A
tube filled with a liquid used to measure pressures.
- LATENT
HEAT OF MELTING
- MANOMETER
- WET
BULB TEMPERATURE
- INCHES
OF MERCURY
- Ratio
of work performed or accomplished as compared to the energy used.
- BTU
- COP
- MBH
- MICRON
- The
temperature at which the addition of any heat will begin a change of state
from a solid to a liquid.
- MELTING
POINT
- BOILING
POINT
- VAPOR
PRESSURE
- RADIATION
- A
common means of assigning quantitative values to volumes of air in
transit, usually abbreviated CFM.
- CUBIC
FEET PER MINUTE
- STATIC
PRESSURE
- THERMISTOR
- WATER
MANOMETER
- Heat
that produces a change of state without a change in temperature; i.e., ice
to water at 32 oF or water to steam
at 212 oF.
- FAHRENHEIT
- BRITISH
THERMAL UNIT
- CENTIGRADE
- LATENT
HEAT
- The
temperature at which the removal of any heat will begin a change of state
from a vapor to a liquid.
- CONDENSING
UNIT -
- CONDENSING
MEDIUM
- COMPRESSION
RATIO
- CONDENSATION
POINT
- Substances
can exist in three states - solid, liquid or vapor.
- FREEZING
POINT
- STATE
CONDITION
- SUB
COOLING
- TON
OF REFRIGERATION
- The
temperature at which the addition of any heat will begin a change of state
from a liquid to a vapor.
- MELTING
POINT
- BOILING
POINT
- VAPOR
PRESSURE
- RADIATION
- Pressure
measured with the base of zero.
- ABSOLUTE
HUMIDITY
- ABSOLUTE
PRESSURE
- ABSOLUTE
TEMPERATURE
- ABSOLUTE
ZERO
- The
reduction of volume of a vapor or gas by mechanical means.
- COMPRESSION
- CONVECTION
- CYCLE
- FLASH
GAS
- The
transfer of heat from molecule to molecule within a substance.
- EVAPORATIVE
COOLING
- HEAT
OF THE LIQUID
- RELATIVE
HUMIDITY
- CONDUCTION
- The
total amount of refrigerant required by a a system for correct operation.
- REFRIGERANT
DISTRIBUTOR
- REFRIGERANT
MIGRATION
- REFRIGERANT
OPERATING CHARGE
- REFRIGERANT
VELOCITY
- A
tube used to convey the compressed refrigerant vapor from the compressor
to the condenser inlet.
- DISCHARGE
PRESSURE
- PRESSURE
DROP
- PUMPDOWN
- DISCHARGE
LINE
- The
mean of difference between the temperature of a fluid receiving and a
fluid yielding heat.
- PSYCHROMETER
- CAPILLARY
TUBE
- TEMPERATURE
- MEAN
TEMPERATURE DIFFERENCES
- Used
to measure vacuum in inches of mercury.
- INCHES
OF MERCURY
- LIQUID
LINE
- MERCURY
MANOMETER
- WATER
MANOMETER
- Conditions
at which capacity ratings for air conditioning equipment is rated.
- MEAN
TEMPERATURE DIFFERENCES
- AMBIENT
- AIR
- TEMPERATURE
- A
condition in which a quantity of liquid enters the compressor causing
hammering and possible compressor damage.
- STATIC
PRESSURE
- EXTERNAL
STATIC PRESSURE
- MUFFLER
- SLUGGING
- The
amount of heat energy, in BTU'S, that must be removed to change the state
of one pound of solid to one pound of vapor at the same temperature.
a.
LATENT HEAT OF CONDENSATION
b.
LATENT HEAT OF FUSION
c.
LATENT HEAT OF MELTING
d.
LATENT HEAT OF VAPORIZATION
- The
slope of a pipe line for the purpose of improving drainage.
- RISER
- TRAP
- PITCH
- LIFT
- The
rate at which refrigerant is moving at a given point in a system, usually
given in feet per minute (FPM).
- REFRIGERANT
DISTRIBUTOR
- REFRIGERANT
MIGRATION
- REFRIGERANT
OPERATING CHARGE
- REFRIGERANT
VELOCITY
- Heat
added to a vapor after all liquid has been vaporized.
- BRITISH
THERMAL UNIT
- TOTAL
HEAT
- TOTAL
PRESSURE
- SUPERHEAT
- The
amount of heat necessary to completely melt one ton of 32oF ice
in 24 hours.
- FREEZING
POINT
- STATE
CONDITION
- SUB
COOLING
- TON
OF REFRIGERATION
- The
cooling effect of vaporization of a liquid in a moving air stream.
- EQUIVALENT
LENGTH
- EVAPORATIVE
COOLING
- EVAPORATOR
- EVAPORATOR
SUPERHEAT
- The
pressure exerted by vapor.
- VELOCITY
PRESSURE
- GAUGE
PRESSURE
- VAPOR
PRESSURE
- VACUUM
- The
transfer of heat without an intervening medium. It is absorbed on contact
with a solid surface.
- MELTING
POINT
- BOILING
POINT
- VAPOR
PRESSURE
- RADIATION
- The portion
of a refrigeration system where the compression and condensation of
refrigerant is accomplished. Sometimes referred to as the 'high side'.
- CONDENSING
UNIT
- CONDENSING
MEDIUM
- COMPRESSION
RATIO
- CONDENSATION
POINT
- The
percentage of water vapor present in a given quantity air compared to the
amount it can hold at its temperature.
- EVAPORATIVE
COOLING
- HEAT
OF THE LIQUID
- RELATIVE
HUMIDITY
- CONDUCTION
- A
temperature scale expressed in degrees oF
- ABSOLUTE
HUMIDITY
- ABSOLUTE
PRESSURE
- ABSOLUTE
TEMPERATURE
- ABSOLUTE
ZERO
- The
pressure read at the compressor outlet. Also called head pressure or high
side pressure.
- DISCHARGE
PRESSURE
- PRESSURE
DROP
- PUMPDOWN
- DISCHARGE
LINE
- A
device for separating out oil entrained in the discharge gas from the compressor
and returning it to the crankcase.
- VAPOR
BARRIER
- HEAT
EXCHANGER
- FILTER-DRIER
- OIL
SEPARATOR
- A
mechanical device used to compress gases. Three main types -
reciprocating, centrifugal and rotary.
- CHECK
VALVE
- CAPILLARY
TUBE
- CONTACTOR
- COMPRESSOR
- Heat
flows from a warmer to a cooler substance. The rate depends upon the
temperature difference, the area exposed and the type of material.
- COMPRESSION
- CONDUCTION
- CONVECTION
- HEAT
FLOW
- An
arbitrary concept which combines into a single value the effect of temperature,
humidity, and air movement as sensed by the human body.
- TEMPERATURE
- FAHRENHEIT
- WET
BULB TEMPERATURE
- EFFECTIVE
TEMPERATURE
- A
depression or dip in refrigerant piping in which oil will collect. A trap may
be placed at the base of a suction or hot gas riser to improve oil return
up the riser.
- VACUUM
- TRAP
- RISER
- PITCH
- The
weight of water vapor in a given amount of air.
- ABSOLUTE
HUMIDITY
- ABSOLUTE
PRESSURE
- ABSOLUTE
TEMPERATURE
- ABSOLUTE
ZERO
- The
amount of heat necessary to change the temperature of 1 pound of pure
water 1 degree Fahrenheit (oF).
- BRITISH
THERMAL UNIT
- TOTAL
HEAT
- TOTAL
PRESSURE
- SUPERHEAT
- A
device in which a liquid refrigerant is vaporized. Some superheating
usually takes place.
- EQUIVALENT
LENGTH
- EVAPORATIVE
COOLING
- EVAPORATOR
- EVAPORATOR
SUPERHEAT
- The
temperature at which molecular activity theoretically ceases. -456.69 F0
or -273.16 oC.
- ABSOLUTE
HUMIDITY
- ABSOLUTE
PRESSURE
- ABSOLUTE
TEMPERATURE
- ABSOLUTE
ZERO
- Refers
to the temperature surrounding a body or unit under test.
- MEAN
TEMPERATURE DIFFERENCES
- AMBIENT
- AIR
- TEMPERATURE
- The
actual temperature of the refrigerant vapor at the evaporator exit as
compared to the saturated vapor temperature indicated by the suction pressure.
- EQUIVALENT
LENGTH
- EVAPORATIVE
COOLING
- EVAPORATOR
- EVAPORATOR
SUPERHEAT
- Conditions
at which capacity ratings for air conditioning equipment is rated.
- MEAN
TEMPERATURE DIFFERENCES
- AMBIENT
- AIR
- TEMPERATURE
- Two
metals with different rates of expansion fastened together. When heated or
cooled they will warp and can be made to open or close a switch or valve.
- CONTACTOR
- BIMETAL
- COP
- MBH
- Device
installed in hot gas line to silence discharge surges.
- STATIC
PRESSURE
- EXTERNAL
STATIC PRESSURE
- MUFFLER
- SLUGGING
- Air
which contains no moisture vapor.
- MEAN
TEMPERATURE DIFFERENCES
- AMBIENT
- AIR
- DRY
AIR
- To
elevate a fluid from one level to a higher level.
- RISER
- TRAP
- PITCH
- LIFT
- A
substance which produces a refrigerating effect while expanding or
vaporizing.
- COOLING
ANTICIPATOR
- AIR
CONDITIONING
- EVAPORATIVE
COOLING
- REFRIGERANT
- A
temperature scale with the freezing point of water 0 oC
and the boiling point 100 oC at sea level.
- FAHRENHEIT
- BRITISH
THERMAL UNIT
- CENTIGRADE
- LATENT
HEAT
- The amount
of heat energy in BTU's that must be removed to change the state of one
pound of a vapor to one pound of liquid at the same temperature.
- LATENT
HEAT OF CONDENSATION
- LATENT
HEAT OF FUSION
- LATENT
HEAT OF MELTING
- LATENT
HEAT OF VAPORIZATION
- A
tube used to convey the liquid refrigerant from the condenser outlet to
the refrigerant control device of the evaporator.
- INCHES
OF MERCURY
- LIQUID
LINE
- MERCURY
MANOMETER
- WATER
MANOMETER
- A
device for the transfer of heat energy from the source to the conveying
medium.
- VAPOR
BARRIER
- HEAT
EXCHANGER
- FILTER-DRIER
- OIL
SEPARATOR
- A
unit used to measure high vacuums. One _________ equals 1/25,400 of one
inch mercury.
- BTU
- COP
- MBH
- MICRON
- The
sum of the static and velocity pressures of a moving air system at the
point of measurement.
- STATIC
PRESSURE
- EXTERNAL
STATIC PRESSURE
- MUFFLER
- SLUGGING
- The
process of controlling the temperature, humidity, cleanliness and
distribution of the air.
- COOLING
ANTICIPATOR
- AIR
CONDITIONING
- EVAPORATIVE
COOLING
- REFRIGERANT
- The weight
of a 1 unit column of the earth's atmosphere.
- ATMOSPHERIC
PRESSURE
- COP
- MBH
- MICRON
- A
refrigerant control consisting of a small diameter tube which controls
flow by restriction. They are carefully sized by inside diameter.
- CHECK
VALVE
- CAPILLARY
TUBE
- CONTACTOR
- COMPRESSOR
- A
chart on which can be found the properties of air under varying conditions
of temperature, water vapor content, volume, etc. A chart on which can be
found the properties of air under varying conditions of temperature, water
vapor content, volume, etc.
- VELOCITY
PRESSURE
- PSYCHROMETRIC
CHART
- VAPOR
PRESSURE
- PSYCHROMETER
- The
ratio determined by dividing the discharge pressure, in PSI (Pa), by the
suction pressure in PSI (Pa).
- CONDENSING
UNIT
- CONDENSING
MEDIUM
- COMPRESSION
RATIO
- CONDENSATION
POINT
- The
complete course of operation of a refrigerant back to a selected starting
point in a system.
- CYCLE
- CHECK
VALVE
- CONTACTOR
- PRESSURE
DROP
- The
term applied to an impervious layer of material superimposed upon a layer
of insulation. Vapor barriers are always applied on the warm side of the
insulation layer.
- VAPOR
BARRIER
- HEAT
EXCHANGER
- FILTER-DRIER
- OIL
SEPARATOR
- The
three methods of heat transfer are conduction, convection and radiation.
- HEAT
FLOW
- HEAT
OF COMPRESSION
- HEAT
OF THE LIQUID
- HEAT
TRANSFER
- Mass
or weight per unit of volume.
- DENSITY
- COP
- MBH
- MICRON
- A
device comprising a small diameter orifice projecting directly into an air
stream measuring total pressure and surrounded by an annular section with small
diameter entrances normal to the flow, measuring static pressure; both
sections are usually connected to a manometer to indicate velocity
pressure.
- PITOT
TUBE
- CHECK
VALVE
- CONTACTOR
- QUICK
CONNECT
- Temperature
read with an ordinary thermometer.
- AMBIENT
- THERMISTOR
- TEMPERATURE
- DRY
BULB TEMPERATURE
- Total
amount of heat in one pound (kg) of a substance calculated from accepted
temperature base, expressed in BTU's per pound mass.
- ENTHALPY
- EQUIVALENT
LENGTH
- EVAPORATIVE
COOLING
- EVAPORATOR
- EVAPORATOR
SUPERHEAT
- Any
pressure below atmospheric pressure.
- VELOCITY
PRESSURE
- GAUGE
PRESSURE
- VAPOR
PRESSURE
- VACUUM
- The
normal force per unit area at a small hole in the wall of a duct.
- STATIC
PRESSURE
- EXTERNAL
STATIC PRESSURE
- MUFFLER
- SLUGGING
- The
pressure exerted by any individual gas in a mixture.
- PARTIAL
PRESSURE
- CHECK
VALVE
- CONTACTOR
- QUICK
CONNECT
- A
term assigned to a velocity of a moving air stream, usually express FPM.
- BTU
- FPM
- MBH
- CFM
- The
volume of a substance per unit of mass; i.e., standard air 13.33 cubic
feet per pound. The reciprocal of density.
- VELOCITY
PRESSURE
- SPECIFIC
VOLUME
- VAPOR
PRESSURE
- STANDARD
AIR DENSITY
- A
device that removes moisture, acid and foreign matter from the
refrigerant.
- VAPOR
BARRIER
- HEAT
EXCHANGER
- FILTER-DRIER
- OIL
SEPARATOR
- The
temperature at which the removal of any heat will begin a change of state
from a liquid to a solid.
- FREEZING
POINT
- STATE
CONDITION
- SUB
COOLING
- TON
OF REFRIGERATION
- Instantaneous
evaporation of some liquid refrigerant at the metering device due to
pressure drop which cools the remaining liquid refrigerant to desired
evaporation temperature.
- FREEZING
POINT
- FLASH
GAS
- ENTHALPY
- CONVECTION
- A
vessel for holding refrigerant liquefied by the condenser.
- RECEIVER
- CHECK
VALVE
- CONTACTOR
- QUICK
CONNECT
- Pressure
measured with atmospheric pressure as a base.
- VELOCITY
PRESSURE
- GAUGE
PRESSURE
- VAPOR
PRESSURE
- VACUUM
- The
increase in total heat (Enthalpy) per pound of a saturated liquid as its
temperature is increased above a chosen base temperature. (Usually - 400F
for refrigerants).
- HEAT
FLOW
- HEAT
OF COMPRESSION
- HEAT
OF THE LIQUID
- HEAT
TRANSFER
- The
decrease in pressure due to friction of a fluid or vapor as it passes
through a tube or duct or/and lift.
- VELOCITY
PRESSURE
- PRESSURE
DROP
- VAPOR
PRESSURE
- VACUUM
- A
device having both a dry and wet bulb thermometer. It is used to determine
the relative humidity in a conditioned space. Most have an indexed scale
to allow direct conversion from the temperature readings to the percentage
of relative humidity.
- VELOCITY
PRESSURE
- PSYCHROMETRIC
CHART
- VAPOR
PRESSURE
- PSYCHROMETER
- Name
given to the end connections on pre-charged lines which screw on to mated
fittings of the outdoor and indoor sections. Tightening the quick
connections ruptures the seals on the fittings and the line charge becomes
part of the total system charge.
- CYCLE
- CHECK
VALVE
- CONTACTOR
- QUICK
CONNECT
- Vapor
in contact with a liquid.
- VELOCITY
PRESSURE
- GAUGE
PRESSURE
- VAPOR
PRESSURE
- SATURATED
VAPOR
- A
device in a heat pump that is electrically controlled to reverse the flow
of refrigerant as the system is switched from cooling to heating; also
called a four-way valve.
- CHECK
VALVE
- CAPILLARY
TUBE
- CONTACTOR
- REVERSING
VALVE
- A
glass installed in the liquid line permitting visual inspection of the liquid
refrigerant for the purpose of detecting vapor in the liquid. They also
generally have a device included to monitor moisture content of the
refrigerant.
- PITOT
TUBE
- SIGHT
GLASS
- CONTACTOR
- QUICK
CONNECT
- .075
pounds per cubic foot. Equivalent to dry air at 700 F and at
sea level pressure.
- VELOCITY
PRESSURE
- PRESSURE
DROP
- VAPOR
PRESSURE
- STANDARD
AIR DENSITY
- A
means by which static pressures of a duct system may be read directly,
usually consisting of a small diameter hole in the side of the duct
connected to a manometer.
- RISER
- TRAP
- STATIC
TAP
- LIFT
- A
tube used to convey the refrigerant vapor from the evaporator outlet to
the suction inlet of compressor.
- PITOT
TUBE
- SUCTION
LINE
- CONTACTOR
- QUICK
CONNECT
- Basically
a semiconductor which has electrical resistance that varies inversely with
temperature.
- THERMISTOR
- THERMOSTAT
- THERMOSTATIC
EXPANSION VALVE
- WET
BULB TEMPERATURE
- A
bimetal actuated switch to close and open a circuit to indicate or
terminate operation of a heating or air conditioning system.
- THERMISTOR
- THERMOSTAT
- THERMOSTATIC
EXPANSION VALVE
- WET
BULB TEMPERATURE
- Refrigerant
control which monitors the flow rate according to the superheat at the
evaporator outlet.
- THERMISTOR
- THERMOSTAT
- THERMOSTATIC
EXPANSION VALVE
- WET
BULB TEMPERATURE
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