[D2L] 102C Intro to Refrigeration Enthalpy & Gas Laws Flashcards
Absolute zero is when molecular motion stops.
T or F
True
What temperature is absolute zero?
0R
Which law is the sum of each individual gas equals the total pressure?
Daltons law
There are 4 gauges attached to this closed vapour filled system. What pressure will each gauge read? You can see a 200psi spot
200psi, Pascal’s Law
If a 50 cubic foot cylinder is moved from a 12 F degree van inside to a 70 F degree room, what will happen to the pressure inside the cylinder?
Increase
What will happen to the pressure inside a cylinder with a pressure of 30 psig and a volume of 10 cubic inches, if the piston moves upstroke and reduces the volume to 2 cubic inches?
Increase
What will cause the most turbulent flow?
1) Deburred pipe
2) Bends made with pipe benders
3) Short radius 90’s
4) Couplings
Short radius 90’s
What will the static pressure be at the main floor of a building 100’ tall if the top pressure gauge shows 20psi
70 psi
What will cause loses in pressure due to piping designs? choose all that apply (MULTI-SELECT)
1) Long piping distances
2) small piping diameter
3) Rough internal smoothness
4) Piping designed with no elbows
1) Long piping distances
2) small piping diameter
3) Rough internal smoothness
The long radius elbow has far less pressure drop than a short radius elbow.
T or F
True
What is the velocity of the refrigerant flowing through the refrigeration system?
Mass flow rate
What is the amount of heat added by the compressor and the compression process during the refrigeration cycle?
Heat of Compression
What is the amount of heat gained in the evaporator during the refrigeration cycle?
Net Refrigeration Effect
What is the amount of heat rejected by the condensing process?
Heat of Rejection
Lower CoP values result in an effective performance
False, high CoP values result in an effective performance
