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問題一覧
1
Hot water from the condenser is cooled by
Cooling tower
2
The change of state from liquid to a gas is called
Evaporation
3
An air-conditioning system supplies full control of...
Humidity /Air temperature
4
___________ of heat transfer takes place in waveforms
Radiation
5
The most likely comfortable range of relative humidity given below is
45-65% RH
6
What factors restrict the use of natural ventilation
Location, pollution, noise
7
Which of the following is NOT a result of inadequate or extreme ventilation
Infiltration
8
Infiltration is a deliberate process aiming to assist ventilation
False
9
At what point does water condense on surfaces
Dew point
10
According to British Standards, which RH is regard as the upper limit of acceptable
70%
11
Do occupants within a dwelling affect condensation levels
Yes
12
Increasing temperature causes molecules to vibrate at _________ rate
a faster
13
Reducing the temperature causes molecules to vibrate at a ________ rate
Slower
14
Which answer below are the three basic modes of heat transfer
Conduction, convection, radiation
15
What is the specific heat capacity of Cast Iron in SHC (J/kgK)
460
16
What is the specific heat capacity of Carbon Steel in SHC (J/kgK)?
490
17
Molecules stop vibrating at .
-273.16 C
18
Psychometrics is the study of________and________of air and water mixtures
Properties, behaviours
19
Human comfort has 2 main components which are
Temperature and relative humidity
20
As the air temperature increases the amount of moisture___.
Stays constant
21
Which one is not a dilution of pollutants?
Nitrogen
22
Ventilation is a combination of____and_____.
Infiltration, purpose ventilation.
23
Which of the below is Internal air temperature not directly dependent on
Moisture content of the external air
24
Which of the below is Mean Internal Temperature (MIT) not dependant on
External moisture content
25
What is the temperature in degrees Celsius of low temperature hot water
70-100 C
26
What is the temperature in degrees Celsius of high temperature hot water
120-150 C
27
Air-conditioning system provides full control of_____,______, and_______.
Air temperature, humidity, cleanliness
28
What are the types of air-conditioning systems
Centralised air, partially centralised and local systems
29
Increasing ventilation rate (from a poorly ventilated area) will normally:
Reduce internal temperature
30
Condensation occurs at an RH of;
100%
31
As air (db) temperature increases
Ability to retain moisture increases
32
All new boilers in the UK are...
Condensing boilers
33
How many KJ of energy is required to increase 1KG of water by 1 degree (Celsius)
4.2KJ
34
What are the most common pollutants
All of them
35
In a mixture of gases (like air) each different gas exerts its own pressure, this is known as its partial pressure. Is this statement true ?
Yes
36
Ventilation is required for:
All of them
37
Greater levels of thermal insulation lead to higher mean internal temperatures and lower internal relative humidity.
True
38
Which one of the statements about sensible and latent heat is true.
In the summer there are sensible and latent gains in a room.
39
Which factor isn’t a disadvantage in relation to air conditioning:
Comfort
40
What is the specific heat capacity of water?
4.2 kJ/kgK
41
Generally, increasing the ventilation rate from low levels…?
reduces internal RH to an optimum level
42
The temperature at which condensation occurs is called the?
Dew point
43
Which of the following types of air conditioning system is not a centralised air conditioning system?
Split unit
44
The total volume flow rate to a space is calculated by?
fresh air supplied + recirculated air
45
What is NOT a type of ventilation:
Suction ventilation
46
The average VP of the internal air is NOT dependent upon what
Internal temperature
47
Natural gas is mainly
Ethane
48
Temperature is the measure of hotness or coldness of matter
true
49
The kelvin scale is based upon absolute zero and is based upon sound scientific principles
true
50
Heat is the energy flow between two objects at different temperatures
true
51
what is convection
The transfer of heat by the bodily movement of particles
52
Convection is what allows "the stack effect" the take place
True
53
What is the quantity of Heat?
Joule (j)
54
What is sensible heat?
the input which is needed to rise temperature through conduction, convection or radiation
55
What is latent heat?
When energy is supplied to a body at its melting or boiling point but there is no temperature change
56
What is relative humidity?
the amount of water vapour content in the air
57
Which factor do Comfort cooling systems not control?
Humidity
58
Which of the Following is true about Mechanical ventilation?
Mechanical ventilation is controllable and can be localised or centralised with ducted distribution.
59
The ‘’thermal model’’ is used to predict the……………in a building.
Mean Internal Temperature.
60
The above diagram 1 shows a Central plant system. What is the name of the part labelled 26?
Cooling tower