Cooling Components of Commercial Air Conditioning Systems: Exam 2

Question 1

Centrifugal Chillers:

1. High pressure R-___
2. Medium press R-____
3. Low pressure R-____

Answer 1

1. R-22
2. R-134a
3. R-123a

Question 2

Centrifugal Chillers: Major components;

1. Centrifugal compressor; max compression ratio = _:1
   - RPM max 30,000RPM
2. Impeller/impellers: Single stage compression or ____-stage compression
3. Inlet guide vanes: Capacity control 100% down to 15% of full load

Answer 2

1. 3

2. multi-stage

Question 3

Centrifugal Chillers: Major components cont’d;

1. Prime mover - _______ motor
2. Condenser - normally ______-cooled with cooling tower
3. Evaporator - shell and tube normally ________

Answer 3

1. electric motor
2. normally water cooled with cooling tower
3. shell and tube normally flooded