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BLDG2011-Building Services (T2, 2025)

BLDG2011-Building Services (T2, 2025)

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Which is the correct connection among chiller, cooling tower and AHU (refer to the set of figures below) when they work together?

(2)

100%

(3)

(1)

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What are the correct names of the following components in turn from left to right?

Components

Condenser, compressor, evaporator, expansion valve

Compressor, evaporator, condenser, expansion valve

Condenser, evaporator, compressor, expansion valve

Compressor, condenser, evaporator, expansion valve

100%

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According to the figure below, all the following statements about vapour compression are correct EXCEPT:

Diagram

Once valve (a) is opened, then a liquid at pressure (P_L) can enter the vessel

The vessel is known as a compressor

The pressure in vessel (P_V) is absolute zero when valve (a) and (b) are closed

If liquid continues to flow into the vessel, eventually the pressure in the vessel will increase until P_V = P_L

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All the following statements about Cooling Towers (CT) are correct EXCEPT:

Safe access to facilitate regular inspection is an important design consideration for CT

Multiple towers connected in parallel are used for large installations

CT is designed to cool chilled water from about 10°C to 5°C as a coolant supply for water-cooled CWS or water-cooled packaged air conditioning units

CTs must be provided by with a water treatment system to manage and control the water quality and use.

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What is the correct description for a home use split air conditioning system?

The interior air is cooled as a fan blows it over the evaporator within the indoor unit

The outdoor unit includes evaporator and compressor

The split air conditioner can work properly without refrigerants

The interior air is cooled as a fan blows it over the evaporator within the outdoor unit

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What is the status of the refrigerant at point A and point B respectively for a refrigeration cycle?

High pressure vapor, low pressure vapor

High pressure liquid, low pressure vapor

High pressure vapor, low pressure liquid

High pressure liquid, low pressure liquid

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What are the correct names of the following components from A-D?

AHU components

Cooling coil, bag filter, pre-filter, fan

Cooling coil, sound attenuator, pre-filter, fan

Cooling coil, sound attenuator, bag filter, fan

Cooling coil, pre-filter, bag filter, fan

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Referring to the following Chilled Water Set (CWS), which statement is correct?

Chilled Water Set

The chilled water, at about 5°C, generated in the evaporator, would be pumped through the cooling coil of an Air Handling Unit (AHU)

The compressor (connected to the evaporator and condenser) pressurises the water vapor from 300 to 1000kPa

The chilled water, at about 5°C, generated in the evaporator, would be delivered to a cooling tower

The condenser water, at about 35°C would be delivered to an Air Handling Unit (AHU)

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All the following statements about Air-Handling Units (AHU) are correct EXCEPT:

AHUs, capable of conditioning an entire building, are normally floor-mounted within a plant room connected to an extensive ductwork distribution system

A typical AHU comprises of fans, cooling & heating coils, filters, dampers, and insulated metal casting cover, etc.

An AHU is used to condition and circulate air as part of a heating, ventilating, and air-conditioning system

An AHU usually connects to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the outdoors

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All the following statements about HVAC systems are correct EXCEPT:

Cooling and de-humidification are required during summer time

❌

Ventilating is mandatory all year round to maintain acceptable indoor air quality

❌

Heating and humidification are required during winter time

❌

Heating and de-humidification are required during winter time

✅

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