Deck 5: Ventilation and Air Conditioning

Question 1

Which is the reason to use ice thermal storage in a HVAC refrigeration system?

A)Reduce energy cost
B)Reduce water chiller plant room space requirement
C)Reduce number of water chillers needed
D)Reduce water chiller run time
E)Install smaller capacity refrigeration compressors

Answer 1

A

Question 2

Which is the most efficient way of recovering energy from room air?

A)Run-around pipe coils
B)Sensible heat recovery thermal wheel
C)Total heat recovery thermal wheel
D)Plate heat exchanger
E)Recirculation

Answer 2

E

Question 3

Outdoor supply air rate recommended for office ventilation is which value in litre per second per person?

A)1
B)10
C)5
D)7
E)9

Answer 3

B

Question 4

What does a chilled beam mean?

A)Chilled water pipes alongside structural floor beams
B)Refrigerated pipe within a room
C)Steel structural beam exposed in the occupied room and cooled by a supply air stream from a directional grille
D)Natural convector chilled water finned pipe
E)Exposed steel beam at high level in a room having chilled water pipes attached

Question 5

Why might an under floor air distribution system, UFAD, with multiple fan terminal units, FTU, have benefits?

A)Provides controllable microclimate at each workstation
B)Not used in commercial buildings as impractical and costly
C)Keeping many under floor fan coil units and their air filter, clean and dust-free, requires excessive maintenance work that disrupts office work
D)Saves having a central air handling unit plant room
E)Many small fans, coils, filters and controllers are cheaper than one large air handling unit

Question 6

Where does Legionella disease originate?

A)Drains and sewers
B)French foreign legion
C)Aerosols from cooling towers, shower heads, spray taps, spa baths and humidifiers
D)Cold water storage tanks
E)Hot water storage cylinders

Question 7

When the coefficient of performance during heating, COP_H, of a vapour compression refrigeration cycles, is 3, which of these is the correct compressor power input to generate 750 kW of heating?

A)750 kW
B)250 kW
C)2250 kW
D)100 kW
E)75 kW

Question 8

Which is a reason for ventilating buildings?

A)Control indoor humidity
B)Removal of sick building syndrome contaminants
C)Removing tobacco smoke and cleaning fluid odours
D)Supply of outdoor air quantity to support life
E)Remove indoor dust

Question 9

Which is correct about air pressurisation of buildings?

A)Supply air fans do not create building air pressurisation
B)Supply and exhaust air quantities must be equal
C)Outdoor wind environment creates internal air pressurisation
D)When exhaust air volume exceeds supply air quantity, building is pressurised
E)When exhaust air volume exceeds supply air quantity, building is depressurised

Question 10

Which is correct about chlorinated fluorocarbons?

A)Must be transferred into a sealed cylinder and sent to recycling or disposal facility
B)Collected and recycled into usable LPG
C)Collected and recycled into foam plastic products
D)Do no harm to the global environment
E)Collected, liquefied and converted into cleaning solvents