Mastering Chiller COP: MCQ Answers and Tips

  • Thread starter Thread starter KingMan
  • Start date Start date
  • Tags Tags
    Chiller Cop
AI Thread Summary
The discussion focuses on the coefficient of performance (COP) of vapor compression chillers, emphasizing that cooling capacity affects efficiency. It highlights that low cooling rates lead to reduced COP due to environmental heat leaks, while high cooling rates can cause inefficiencies. The main point of contention is whether the inefficiencies at high cooling rates stem from heat transfer and fluid friction losses, with one participant suggesting option d as the correct answer. The need for clarification on why option d is preferred over a, b, or c is also expressed. Understanding these factors is crucial for mastering chiller COP in practical applications.
KingMan
Messages
2
Reaction score
0
Summary:: MCQ about COP of chiller

The COP of a vapor compression chiller is characterized by its cooling capacity. At low cooling rates, the chiller COP is reduced by the effects of heat leaks to the environment. On the other hand, at high cooling rates, the chiller suffers from

a) the high vibration of the major moving parts
b) the inefficient operation of the expansion device
c) the high mass leaks in the vapor compression machine
d) the finite rate of heat transfer and fluid friction losses of the working fluid

I think the answer is d, anyone can assist to confirm? Much appreciated.
 
Physics news on Phys.org
This is PF, so you need to explain why you think that the answer is d, and not a, b, or c.
 
Thread 'Have I solved this structural engineering equation correctly?'
Hi all, I have a structural engineering book from 1979. I am trying to follow it as best as I can. I have come to a formula that calculates the rotations in radians at the rigid joint that requires an iterative procedure. This equation comes in the form of: $$ x_i = \frac {Q_ih_i + Q_{i+1}h_{i+1}}{4K} + \frac {C}{K}x_{i-1} + \frac {C}{K}x_{i+1} $$ Where: ## Q ## is the horizontal storey shear ## h ## is the storey height ## K = (6G_i + C_i + C_{i+1}) ## ## G = \frac {I_g}{h} ## ## C...
Back
Top