hvac refrigeration cycle dvd

7/30/2019 Hvac Refrigeration Cycle Dvd

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HVAC: The Refrigeration CycleSupplement for CEV Video #786

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HVAC: The Refrigeration CycleSupplement for CEV Video #786

Goal:

The student will understand the basic principle of the refrigerationcycle.

Objectives:

1. to understand the properties and relationships of matter,

temperature and heat

2. to identify the four major components in a refrigeration or air conditioning system and explain their purpose

3. to demonstrate an understanding of the pressure/temperaturerelationship of refrigerant as it flows through the system

4. to understand the effect each component has on the refrigerantduring the refrigeration cycle

i



HVAC: The Refrigeration CycleVideo Quiz I

Multiple Choice

___ 1. The three states of matter area. solids, liquids, gasesb. atoms, molecules, ionsc. protons, neutrons, electronsd. solids, liquids, minerals

___ 2. The point where all molecular motion stops is calleda. the freezing pointb. below zero temperaturec. absolute zero

d. a vacuum

___ 3. A form of energy that sets molecules in motion isa. coldb. windc. pressured. heat

___ 4. Heat that is readily measured with a thermometer is called

a. latent heatb. superheatc. sensible heatd. total heat

___ 5. Which of the following occurs when heat is absorbed by a liquid,changing the liquid to a vapor?

a. condensationb. evaporationc. absorption

d. vaporization

1



HVAC: The Refrigeration CycleVideo Quiz II

Multiple Choice

___ 1. Refrigeration and air conditioning compressors are designed tocompress

a. liquid refrigerantb. vapor refrigerantc. both liquid and vapor refrigerantd. none of the above

___ 2. Heat is removed from high temperature, high pressure refrigerantvapor in the

a. condenser

b. evaporator c. compressor d. metering device

___ 3. A thermostatic expansion valve is a type of a. air valveb. gas valvec. shut-off deviced. metering device

___ 4. The component of the refrigeration cycle that absorbs heat is thea. evaporator b. condenser c. metering deviced. compressor

___ 5. Refrigerant leaves the condenser as aa. high pressure, high temperature vapor b. high pressure, subcooled liquid

c. low pressure, superheated vapor d. low pressure, low temperature liquid

2



HVAC: The Refrigeration CycleVideo Quiz III

Multiple Choice

___ 1. Refrigerant absorbs heat in the evaporator and releases it in thea. compressor b. condenser c. metering deviced. refrigeration lines

___ 2. The term CFCs stands for a. chlorine, fluorine, carbonb. chlorofluorochlorinesc. chlorofluorocarbons

d. chloride, fluoride, carbide

___ 3. Zero ozone depletion potential refrigerants are known asa. HFCsb. CFCsc. HCFCsd. FHCs

___ 4. Refrigerants must be miscible. This means they

a. must mix easily with oxygenb. can be used in any systemc. are legal for use in the United Statesd. must mix easily with the required lubricant

___ 5. Refrigerant cylinders are color coded to indicatea. the type of refrigerant they containb. their chemical makeupc. the weight of the cylinder d. the manufacturer

3



HVAC: The Refrigeration Cycle Video Quiz IV

Multiple Choice

___ 1. Refrigerant entering the compressor is aa. low pressure, low temperature liquidb. low pressure, superheated vapor c. high pressure, subcooled liquidd. high pressure, high temperature vapor

___ 2. Superheated suction gas prevents liquid refrigerant from potentiallycausing damage to the

a. condenser b. evaporator

c. compressor d. metering device

___ 3. As refrigerant passes through a metering device, it becomes amixture of

a. 75% liquid, 25% vapor b. 50% liquid, 50% vapor c. 25% liquid, 75% vapor d. 30% liquid, 70% vapor

___ 4. Refrigerant leaving the evaporator will be aa. high pressure, subcooled liquidb. high pressure, high temperature vapor c. low pressure, superheated vapor d. low pressure, low temperature liquid

___ 5. Subcooled liquid from the condenser reaches the metering devicethrough the

a. suction line

b. liquid linec. discharge lined. evaporator line

4



HVAC: The Refrigeration Cycle Final Video Quiz

Multiple Choice

___ 1. The four major components of the refrigeration cycle are thea. compressor, condenser, fan, evaporator b. compressor, refrigerant, metering device, condenser c. refrigerant, condenser, metering device, evaporator d. compressor, condenser, metering device, evaporator

___ 2. A chemical compound used to absorb heat in the evaporator isknown as

a. RCFC

b. refrigerantc. ozoned. chlorine

___ 3. Compression raises the temperature and pressure of the refrigerantand the result in temperature increase is

a. liquid refrigerantb. flash gasc. subcoolingd. superheat

___ 4. The changing of vapor to a liquid at a particular pressure andtemperature by removing heat is known as

a. evaporationb. absorptionc. condensationd. vaporization

___ 5. Cold is the absence of

a. heatb. temperaturec. atmospheric pressured. both a and b

5



___ 6. Which of the following is a commonly used metering device?a. capillary tubeb. fixed bore flow rated devicec. thermostatic expansion valved. all of the above

___ 7. Heat will only flow from a substance at a higher temperature to another substance which is at

a. a higher temperatureb. a lower temperaturec. an equal temperatured. room temperature

___ 8. High pressure, high temperature vapor leaving the compressor isknown as

a. suction gas

b. condensed vapor c. discharge gasd. pre-liquid vapor

___ 9. The term HFCs stands for a. hydrofluorocarbonsb. hydrochlorofluorocarbonsc. hydrogen, fluoride, chlorined. hydrogen, fluorine, carbon

___ 10. The temperature of liquid refrigerant cooled below its saturatedpressure-temperature is called

a. superheatb. subcoolingc. saturation pointd. saturation cooling

6



HVAC: The Refrigeration Cycle Answer Key for CEV Video #786

Multiple Choice

a 1. The three states of matter area. solids, liquids, gasesb. atoms, molecules, ionsc. protons, neutrons, electronsd. solids, liquids, minerals

c 2. The point where all molecular motion stops is calleda. the freezing pointb. below zero temperaturec. absolute zero

d. a vacuum

d 3. A form of energy that sets molecules in motion isa. coldb. windc. pressured. heat

c 4. Heat that is readily measured with a thermometer is called

a. latent heatb. superheatc. sensible heatd. total heat

b 5. Which of the following occurs when heat is absorbed by a liquid,changing the liquid to a vapor?

a. condensationb. evaporationc. absorption

d. vaporization

1




Multiple Choice

b 1. Refrigeration and air conditioning compressors are designed tocompress

a. liquid refrigerantb. vapor refrigerantc. both liquid and vapor refrigerantd. none of the above

a 2. Heat is removed from high temperature, high pressure refrigerantvapor in the

a. condenser

b. evaporator c. compressor d. metering device

d 3. A thermostatic expansion valve is a type of a. air valveb. gas valvec. shut-off deviced. metering device

a 4. The component of the refrigeration cycle that absorbs heat is thea. evaporator b. condenser c. metering deviced. compressor

b 5. Refrigerant leaves the condenser as aa. high pressure, high temperature vapor b. high pressure, subcooled liquid

c. low pressure, superheated vapor d. low pressure, low temperature liquid

2




Multiple Choice

b 1. Refrigerant absorbs heat in the evaporator and releases it in thea. compressor b. condenser c. metering deviced. refrigeration lines

c 2. The term CFCs stands for a. chlorine, fluorine, carbonb. chlorofluorochlorinesc. chlorofluorocarbons

d. chloride, fluoride, carbide

a 3. Zero ozone depletion potential refrigerants are known asa. HFCsb. CFCsc. HCFCsd. FHCs

d 4. Refrigerants must be miscible. This means they

a. must mix easily with oxygenb. can be used in any systemc. are legal for use in the United Statesd. must mix easily with the required lubricant

a 5. Refrigerant cylinders are color coded to indicatea. the type of refrigerant they containb. their chemical makeupc. the weight of the cylinder d. the manufacturer

3




Multiple Choice

b 1. Refrigerant entering the compressor is aa. low pressure, low temperature liquidb. low pressure, superheated vapor c. high pressure, subcooled liquidd. high pressure, high temperature vapor

c 2. Superheated suction gas prevents liquid refrigerant from potentiallycausing damage to the

a. condenser b. evaporator

c. compressor d. metering device

a 3. As refrigerant passes through a metering device, it becomes amixture of

a. 75% liquid, 25% vapor b. 50% liquid, 50% vapor c. 25% liquid, 75% vapor d. 30% liquid, 70% vapor

c 4. Refrigerant leaving the evaporator will be aa. high pressure, subcooled liquidb. high pressure, high temperature vapor c. low pressure, superheated vapor d. low pressure, low temperature liquid

b 5. Subcooled liquid from the condenser reaches the metering devicethrough the

a. suction line

b. liquid linec. discharge lined. evaporator line

4




Multiple Choice

d 1. The four major components of the refrigeration cycle are thea. compressor, condenser, fan, evaporator b. compressor, refrigerant, metering device, condenser c. refrigerant, condenser, metering device, evaporator d. compressor, condenser, metering device, evaporator

b 2. A chemical compound used to absorb heat in the evaporator isknown as

a. RCFCb. refrigerant

c. ozoned. chlorine

d 3. Compression raises the temperature and pressure of the refrigerantand the result in temperature increase is

a. liquid refrigerantb. flash gasc. subcoolingd. superheat

c 4. The changing of vapor to a liquid at a particular pressure andtemperature by removing heat is known as

a. evaporationb. absorptionc. condensationd. vaporization

a 5. Cold is the absence of a. heat

b. temperaturec. atmospheric pressured. both a and b

5



6

d 6. Which of the following is a commonly used metering device?a. capillary tubeb. fixed bore flow rated devicec. thermostatic expansion valved. all of the above

b 7. Heat will only flow from a substance at a higher temperature to another substance which is at

a. a higher temperatureb. a lower temperaturec. an equal temperatured. room temperature

c 8. High pressure, high temperature vapor leaving the compressor isknown as

a. suction gas

b. condensed vapor c. discharge gasd. pre-liquid vapor

a 9. The term HFCs stands for a. hydrofluorocarbonsb. hydrochlorofluorocarbonsc. hydrogen, fluoride, chlorined. hydrogen, fluorine, carbon

b 10. The temperature of liquid refrigerant cooled below its saturatedpressure-temperature is called

a. superheatb. subcoolingc. saturation pointd. saturation cooling

hvac refrigeration cycle dvd

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