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