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HVAC UNIT 9 Word List > WORD LIST > Flashcards

Flashcards in WORD LIST Deck (19)
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1
Q

Global warming

A

An earth warming process caused by the atmospheres absorption of the heat energy radiated from the surface

2
Q

HC

A

Hydrocarbons

Organic compounds containing hydrogen and carbon found in many heating fuels

3
Q

Low loss fittings

A

A fitting that is fastened to the end of a gauge manifold that allows the technician to connect and disconnect gauge lines with a minimum of refrigerant loss

4
Q

ODP

A

A scale used to measure how much a substance will deplete stratospheric ozone ODP from 0 to 1

5
Q

Temperature glide

A

When a refrigerant blend has different temperatures when it evaporates and condensate at a single given pressure

6
Q

Zeotrope

A

Two or more refrigerants mixed together that will have a range of boiling and condensing points for each system pressure, noticeable fractionation and temperature glide will occur.

7
Q

Azeotropes

A

Two or more refrigerants mixed together that will have only one boiling point and condensing point for each system pressure negligible fractionation or temperature glide will occurr

8
Q

GWP

A

An index that measures the direct effect of chemicals emitted into the atmosphere

9
Q

HCFC

A

Hydrochlorofluorocarbons
Refrigerant containing hydrogen, chlorine, fluorine, and carbon, thought to contribute to the depletion of the ozone layer not to the extent of CFC

10
Q

Montreal protocol

A

An agreement signed in 1987 by the united state and other countries to control the release of ozone-depleting substance

11
Q

Piercing valve

A

A devise that is used to pierce a pipe or tube to obtain a pressure reading with out interrupting the flow of fluid, also called a line tap valve

12
Q

TEWI

A

Total equivalent warming impact,
A global warming index that takes into account both the direct effects of chemicals emitted into the atmosphere and the indirect effects caused by systems inefficiencies

13
Q

Fractionation

A

When a zeotropic refrigerant blend phase changes, the different components in the blend all have different vapors pressure, this cause different vaporization and condensation rates and temperature

14
Q

Greenhouse effect

A

An earth warming process caused by the atmospheres absorption of the heat energy radiated from the earth surface. Often referred to as global warming

15
Q

HFC

A

Hydrofluorocarbon

A chlorine-free refrigerant containing hydrogen, fluorine, and carbon with zero ozone depletion potential

16
Q

Ozone

A

A form of oxygen (O3) a layer of ozone is in the stratosphere that protects the earth from the suns ultraviolet radiation

17
Q

POE

A

A very popular ester based lubricant often used in HFC refrigerant systems

18
Q

Ultraviolet

A

Light waves that can only be seen under a special lamp

19
Q

Alkylbenzene

A

A popular synthetic lubricant that works best with HCFC based refrigerant blends and CFC