Introduction to Refrigerants Chapter 9 Exam Questions and Answers Already Passed
In 1930 Refrigerant 12 also called Freon-12 and R-12 - AnswersWhat was the chlorofluorocarbons
(CFC's) created by DuPont Company in 1930 called?
It acts as a filter for the sun's ultraviolet rays protecting from harmful effects from the suns rays. -
AnswersWhat does the ozone layer do?
US government agency charged with enforcing regulations for working with refrigerants - AnswersThe
environmental protection agency (EPA)
A federal law that includes guidelines, restrictions, and penalties for releasing refrigerants into the
atmosphere. - AnswersClean air act
Is a lubricants ability to remain stable in high heated areas. - AnswersThermal stability
Is the measurement of the ability of a refrigerant to destroy the ozone layer. The base unit of
measurement is the refrigerant R-11, which has an ODP of 1.0 - AnswersOzone depletion potential
(ODP)
Is a measurement of the ability of a gas to contribute to global warming over time. The baseline gas is
carbon dioxide (Co2) - Answersglobal warming potential (GWP)
The ability of a chemical to destroy ozone. - AnswersOzone Depletion Potential
Ozone depletion potential - AnswersHydrofluorocarbons (HFC's) and hydrocarbons (HC's) and inorganic
refrigerants have no what?
Chlorofluorocarbons (CFC's) - AnswersWhat was the first halogen based refrigerants developed over 80
years ago?
R-11 and R-12 - AnswersName two popular CFC refrigerants
100,000 ozone molecules - AnswersEach chlorine atom breaks apart how many ozone molecules
Refrigerant whose molecules are composed of hydrogen chlorine fluorine and carbon. -
AnswersHydrochlorofluorocarbons (HCFC's)
R-22 and R-123 - AnswersName 2 common hydrochlorofluorocarbons (HCFC's) refrigerants
All the hydrogen atoms in the original methane or ethane molecule have been replaced by halogens,
such as chlorine & fluorine. - AnswersFully halogenated CFC's
Because not all hydrogen atoms have been replaced by chlorine and fluorine. - AnswersWhy are HFC's
considered to be partially halogenated?
Refrigerants that contain hydrogen fluorine and carbon. Differ from CFC's and HCFC's since they have no
chlorine atoms. - AnswersHydrofluorocarbons (HFC's)
, R-134a R-152a and R404a - AnswersName 3 common HFC refrigerants
Are mixtures of two or more established refrigerants. - AnswersRefrigerant blends
Zoetropes azeotropes and near zoetropes - AnswersName the 3 refrigerant blend groups
R-12 R-22 R-134a - AnswersName 3 common mixed refrigerant blends
Refrigerant blends that respond to changes in pressure and temperature like a single refrigerant, having
fixed boiling and condensing points. - AnswersAzeotropes
Series of 500 - AnswersWhat ASHRAE classification number series does Azeotropes come under?
Refrigerant blends which each individual refrigerant that makes up the blend responds differently to
conditions based on its individual characteristics - AnswersZoetropes
They boil and condense at different temperatures (for a given pressure) the boiling (bubble) and
condensing (dew) points of zoetropes are different temperatures do to fractionation. - AnswersHow are
zoetrope refrigerant blends different?
The Separating of zeotropic blends individual refrigerants during phase change. This happens because
different refrigerants in zeotropic blends have different boiling points. The refrigerant with the lowest
boiling point boils 1st. - AnswersFractionation
The temperature at which a liquid zoetrope first begins to boil. - AnswersBubble Point
The temperature at which a vapor zoetrope first begins to condense. - AnswersDew point
Temperature difference between the vapor and liquid state during evaporation or condensation at a
constant pressure - AnswersTemperature glide
Temperature glide - AnswersThis is a unique characteristic of zeotropic blends
Zeotropes - AnswersCan change phase and temperature at the same time, and each blend has its own
temperature glide.
Bubble point - AnswersThe temperature at which a liquid zeotrope first begins to boil is called?
Dew point - AnswersThe temperature at which a vapor zeotrope first begins to condense ?
Series 400 - AnswersZeotropes are grouped in what ASHRAE classification series?
Are composed of hydrogen fluorine and carbon but they have at least 1 double bond between the
carbon atom. - AnswersHydrofluorocarbons-olefins (HFO's)
Are organic substances that contain carbon and hydrogen - AnswersHydrofluorocarbons (HC's)
Cylinder color code - AnswersNOT required for all refrigerant manufacturers
In 1930 Refrigerant 12 also called Freon-12 and R-12 - AnswersWhat was the chlorofluorocarbons
(CFC's) created by DuPont Company in 1930 called?
It acts as a filter for the sun's ultraviolet rays protecting from harmful effects from the suns rays. -
AnswersWhat does the ozone layer do?
US government agency charged with enforcing regulations for working with refrigerants - AnswersThe
environmental protection agency (EPA)
A federal law that includes guidelines, restrictions, and penalties for releasing refrigerants into the
atmosphere. - AnswersClean air act
Is a lubricants ability to remain stable in high heated areas. - AnswersThermal stability
Is the measurement of the ability of a refrigerant to destroy the ozone layer. The base unit of
measurement is the refrigerant R-11, which has an ODP of 1.0 - AnswersOzone depletion potential
(ODP)
Is a measurement of the ability of a gas to contribute to global warming over time. The baseline gas is
carbon dioxide (Co2) - Answersglobal warming potential (GWP)
The ability of a chemical to destroy ozone. - AnswersOzone Depletion Potential
Ozone depletion potential - AnswersHydrofluorocarbons (HFC's) and hydrocarbons (HC's) and inorganic
refrigerants have no what?
Chlorofluorocarbons (CFC's) - AnswersWhat was the first halogen based refrigerants developed over 80
years ago?
R-11 and R-12 - AnswersName two popular CFC refrigerants
100,000 ozone molecules - AnswersEach chlorine atom breaks apart how many ozone molecules
Refrigerant whose molecules are composed of hydrogen chlorine fluorine and carbon. -
AnswersHydrochlorofluorocarbons (HCFC's)
R-22 and R-123 - AnswersName 2 common hydrochlorofluorocarbons (HCFC's) refrigerants
All the hydrogen atoms in the original methane or ethane molecule have been replaced by halogens,
such as chlorine & fluorine. - AnswersFully halogenated CFC's
Because not all hydrogen atoms have been replaced by chlorine and fluorine. - AnswersWhy are HFC's
considered to be partially halogenated?
Refrigerants that contain hydrogen fluorine and carbon. Differ from CFC's and HCFC's since they have no
chlorine atoms. - AnswersHydrofluorocarbons (HFC's)
, R-134a R-152a and R404a - AnswersName 3 common HFC refrigerants
Are mixtures of two or more established refrigerants. - AnswersRefrigerant blends
Zoetropes azeotropes and near zoetropes - AnswersName the 3 refrigerant blend groups
R-12 R-22 R-134a - AnswersName 3 common mixed refrigerant blends
Refrigerant blends that respond to changes in pressure and temperature like a single refrigerant, having
fixed boiling and condensing points. - AnswersAzeotropes
Series of 500 - AnswersWhat ASHRAE classification number series does Azeotropes come under?
Refrigerant blends which each individual refrigerant that makes up the blend responds differently to
conditions based on its individual characteristics - AnswersZoetropes
They boil and condense at different temperatures (for a given pressure) the boiling (bubble) and
condensing (dew) points of zoetropes are different temperatures do to fractionation. - AnswersHow are
zoetrope refrigerant blends different?
The Separating of zeotropic blends individual refrigerants during phase change. This happens because
different refrigerants in zeotropic blends have different boiling points. The refrigerant with the lowest
boiling point boils 1st. - AnswersFractionation
The temperature at which a liquid zoetrope first begins to boil. - AnswersBubble Point
The temperature at which a vapor zoetrope first begins to condense. - AnswersDew point
Temperature difference between the vapor and liquid state during evaporation or condensation at a
constant pressure - AnswersTemperature glide
Temperature glide - AnswersThis is a unique characteristic of zeotropic blends
Zeotropes - AnswersCan change phase and temperature at the same time, and each blend has its own
temperature glide.
Bubble point - AnswersThe temperature at which a liquid zeotrope first begins to boil is called?
Dew point - AnswersThe temperature at which a vapor zeotrope first begins to condense ?
Series 400 - AnswersZeotropes are grouped in what ASHRAE classification series?
Are composed of hydrogen fluorine and carbon but they have at least 1 double bond between the
carbon atom. - AnswersHydrofluorocarbons-olefins (HFO's)
Are organic substances that contain carbon and hydrogen - AnswersHydrofluorocarbons (HC's)
Cylinder color code - AnswersNOT required for all refrigerant manufacturers
