Applied Science & Math Flashcards
Matter is commonly explained as a substance that occupies space and has
Mass
Solid mass exerts pressure
Downward only
Liquid mass exerts pressure
Down and outward
The “Law of Conservation of Energy” states that energy is neither created nor destroyed but
Can be converted from one form to another
Dalton’s Law of Partial Pressures shows that the total pressure of a confined mixture of gases is
The sum of all the gases
Heat flow is always in the direction of
Hot to cold
Latent heat is experienced
Water turns to steam
When ice melts
Convert 70 degrees Fahrenheit to Celsius
21
C = F – 32/1.8 C= 21
An increase of temperature on a confined gas creates
An increase in pressure
What is the pressure of R-22 Refrigerant if the temperature is 32 degrees f?
57.5 psi
An evaporator’s primary purpose is to
Absorb heat from the refrigerated product
Residential and light commercial HVAC systems typically use
Reciprocating compressors
Rotary compressors
Scroll compressors
The condenser receives hot refrigerant vapor from the compressor and
Cools the refrigerant causing a latent heat exchange
Removes heat from the refrigerant causing a sensible heat change
Residential and light commercial HVAC systems typically use
Capillary metering
Thermal expansion valve metering
Automatic expansion valve metering
The most common refrigerant used in existing modern residential or light commercial air conditioning systems is
R-22
