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