01
Front
How does a refrigerant transfer heat?
Back
Refrigerants absorb heat as they evaporate and release heat as they condense.
Free Online Flashcard Deck
2 Refrigerant Types and Environmental Properties Free Online FlashCards
Study 2 Refrigerant Types and Environmental Properties with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
Why is there no ideal refrigerant for every application?
Back
No single refrigerant is ideal for every application; environmental impact, efficiency, cost, safety, and equipment suitability all matter.
03
Front
How do HCFCs compare with CFCs in ozone-depletion potential?
Back
HCFCs contain chlorine and hydrogen. They generally have lower ODP than CFCs, but still contribute to ozone depletion.
04
Front
What distinct hazards are associated with natural refrigerants?
Back
Their hazards vary: ammonia is toxic, hydrocarbons are flammable, and CO₂ systems operate at high pressure.
05
Front
What reference substance defines an ODP of 1?
Back
ODP compares a substance’s ozone-depletion capacity with that of CFC-11, which is assigned an ODP of 1.
06
Front
What are indirect emissions from a refrigeration system?
Back
They are greenhouse gases emitted when electricity is generated to run the equipment.
07
Front
What is temperature glide in a refrigerant blend?
Back
Temperature glide is the temperature change a blend undergoes as it evaporates or condenses at a given pressure.
08
Front
What does the letter in an ASHRAE refrigerant safety class indicate?
Back
A indicates lower toxicity under the standard’s criteria; B indicates higher toxicity.
09
Front
Why can an HFC have zero ODP but substantial GWP?
Back
HFCs contain no chlorine, so they have zero ODP; many nevertheless have substantial GWP.
10
Front
What environmental and safety traits are common among HFOs?
Back
Many HFOs have very low GWP and zero or near-zero ODP, but some are mildly flammable.
11
Front
What does GWP compare?
Back
GWP compares the heat-trapping effect of a mass of gas with that of the same mass of CO₂ over a specified period; CO₂ has a GWP of 1.
12
Front
Does zero ODP mean a refrigerant has low GWP?
Back
No. ODP and GWP measure different effects; many HFCs have zero ODP but substantial GWP.
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