Week 3 Install MOD HW Unit 18

Define refrigerant.

• Refrigerant is the fluid used in a refrigeration system for transferring heat. Refrigerants in mechanical refrigeration systems do this by changing their physical state. They absorb heat by evaporating from a liquid to a vapor; they release heat by condensing from a vapor back to a liquid.

• Liquid with Low boiling point

What organization has established the number designation for refrigerants?

• ASHRAE – American Society of Heating, Refrigeration, and Air Conditioning Engineers

• AHRI

What are the chemical components of CFC refrigerant?

• Chlorine, Fluorine, and Carbon

• CO, O2,CO2

• Carbon, Fluoride, CO2

What are the chemical components of HCFC refrigerant?

• Hydrogen, Chlorine, Fluorine, and Carbon

• H20, Carbon, Fluoride, Chlorine

What are the chemical components of HFC refrigerant?

• Hydrogen, Fluorine, and Carbon

• Hydro, Fluoride, Carbon

What is ozone?

• Ozone is an oxygen molecule formed with 3 oxygen atoms instead of the normal 2.

• Ozone is 03, and oxygen with 3 carbons

• Trioxygen

Which chemical family of refrigerants has the highest ozone depletion potential?

• CFC chlorofluorocarbons

• HCHC

• HC

• HFO

What is the primary safety concern when working with R-410A?

• HFC-410A operates at much higher pressures than most conventional refrigerants. Approximately 40% – 60% higher than R-22.

• It depletes the ozone more

• It is flammable

Define the term “glide” when referring to zeotropic refrigerants.

• Glide is the temperature difference between the bubble point and the dew point of a zeotropic refrigerant at any particular pressure.

• Glide is the rate at which refrigerant can flow

• Glide is the rate at which refrigerant can be charged

Explain the ASHRAE refrigerant safety designation regarding refrigerants toxicity and flammability.

• A – lower toxicity - requires more than 400 parts per million to be hazardous B- higher toxicity – requires less than 400 parts per million to be hazardous

• yep