Bill Final Review

Question 1

CCF= NRE+HOC-Super heat

Over NRE

Answer 1

Yes

Question 2

What happens when volumetric efficiency goes up

Answer 2

Compression ratio goes down

Question 3

When refrigerant vapour leaving evaporator has additional super heat add in the suction will will extra superheat decreases specific volume

Answer 3

No it increases

Question 4

If refrigerant entering comp has specific volume .9ft3/lb

Answer 4

1.1lb/ft3

Question 5

Effective way to reduce flash gas entering evaporator

Answer 5

More sub cooling

Question 6

5 main variables that provide data in pressure enthalpy diagram

Answer 6

Pressure
Temperature 
Specific volume 
Enthalpy 
Entropy

Question 7

What happens to capacity of a reciprocating compressor aw compression ratio increases

Answer 7

Volumetric efficiency decreases

Question 8

What is the Net Refrigeration Effect?

Answer 8

Amount of useful cooling in performance by the evaporator c

Question 9

Difference between actual volume and theoretical

Answer 9

Actual accounts for re-expansion of refrigerant left in the cylinder after each compression stroke

Question 10

Bigger pressure drop across a thermostatic expansion valve means?

Answer 10

Increases capacity of the valve

Question 11

Most vertical lines found inside saturated region of pressure enthalpy

Answer 11

Percent of liquid and vapour present in evaporator

Question 12

Too much suction line super heat can cause a reduction in system performance why

Answer 12

Increases in specific volume results in less mass flow rate per min

Question 13

Is more COP good

Answer 13

Yes