18. The person responsible for selecting control valves, coordinating them with heat transfer devices, and providing a schedule of devices and a detailed connection schematic is which of the following?
A. architect
B. HVAC designer
C. project engineer
19. This type of diffuser features a series of openings arranged in a radial pattern around the center of the diffuser face.
A. slaque-face 
B. square
C. swirl
20. A common application to compare retrofit alternatives for existing buildings is which of the following?
A. plug loads
B. energy modeling
C. building orientation You should write your response with 550 or more words.
user