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問題一覧
1
What is the first state found on the psychrometric Chart?
internal air conditions
2
What type of heat transfer allows a radiator to leave a room?
Convection
3
Which of the following is an advantage of Air Conditioning?
Comfort
4
Latent heat is defined as:
The quantity of heat input which changes the state of a body.
5
Opposition to heat flow of materials is known as what?
Thermal resistance
6
In a constant air volume air conditioning system the amount of fresh air entering the air conditioned space is…
Equal to the air leaving the space
7
What does the BS5250:1989 specify an acceptable for internal?
70%
8
What is the acronym for “VOC”?
Volatile Organic Compound
9
What type of boiler is shown in diagram 2?
Non-Condensing Boiler.
10
An air-conditioning system provides full control of:
all or them
11
Which of the following is referred to as the ‘total heat content’ of air?
Enthalpy
12
What is the thermal transmittance more commonly known as?
U-value
13
At 100% saturation wet bulb temperature and dry bulb temperature are:
the same
14
What does DPT Stand for predicting condensation?
Dew point temperature
15
Saturated Vapour pressure…
all of these
16
What are the driving forces that occur for natural ventilation?
Wind and Temperature
17
The most common pollutants in buildings include:
CO, formaldehyde, NO2, VOCs
18
Sensible heat can be defined as:
Quantity of heat input which changes the temperature of a body
19
What type of radiation is glazing particularly good at allowing through?
Solar radiation
20
What parameter is not depicted on a psychrometric chart?
Dew point
21
What does PMV mean?
Predicted mean value
22
What does Convection form in?
Liquid
23
What are the main benefits of a Variable Air Volume (VAV)?
All the Above
24
What line on a psychometric graph represents the Dry Bulb temperature?
Vertical
25
When the PMV is zero the PPD is likely to be?
5% or lower
26
If RH in the room is saturated then:
both readings will be the same
27
Which of the following is Mean internal temperature dependent upon?
all of these
28
The temperature at which molecular activity stops is called what?
Absolute zero
29
Psychrometrics is the study of the properties and behaviour of_________ mixtures?
Air and water
30
For free cooling to be effective:
The external enthalpy needs to be lower than the internal enthalpy.
31
Heat flows from cooler to hotter environments. True or false
False
32
What is WBT?
Wet bulb thermometer
33
What is the most common pollutant found in buildings?
All the above
34
What are the basic forms of heat loss in a building?
Conduction and Convection
35
What is the result when ventilation systems are operating at a high rate?
excessive energy consumption
36
What is the destratification pump on DHW cylinder used for?
All of them
37
Which of the following is false about Fan coils?
They are not as noisy.
38
What does PPD mean?
Predicted percentage of dissatisfaction
39
The limits on buildings that can utilize natural ventilation are:
due to the location
40
What Building Regulation applies to ventilation?
Part F
41
What type of heat loss mainly occurs through walls?
Conduction
42
What does ṁ mean?
Mass Flow Rate
43
What does TRV stand for?
Thermostatic radiator valve
44
Which air conditions system is the cheapest from the maintenance point of view:
constant air volume
45
If we add water vapour to air, we increase the_______?
Enthalpy
46
Water vapour in the air comes from:
all of them
47
Waht does thermal equilibrium mean?
When materials are the same temperature
48
What is DBT?
Dry bulb temperature
49
Where would the stack effect be most useful?
A Shopping Mall
50
What type of radiant heat is emitted by surfaces of buildings?
Long wave