Sem 2 - Ventilation Flashcards

1
Q

What part of the building regulations deals with Ventilation

A

Part F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What building has a BREEAM outstanding for excellence

A

One Angel Square, Manchester

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is infiltration

A

Infiltration is the unintentional or accidental introduction of outside air into a building, typically through cracks in the building envelope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the two main drawbacks to cross ventilation

A

Not appropriate in noisy polluted environments and opening windows in winter wastes energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Air permeability is measured in what.

A

m3/m2h@50pa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Units in Air Changes per Hour (ac/h); 1 litre/sec is equal to

A

3.6m3 / hour or 3600 litres per hour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the two types of natural ventilation

A
  • Cross Ventilation
  • Stack Ventilation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the three different types of ventilation

A

Natural, mechanical and mixed mode.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the three units of measure fro ventilation

A

litres per second (l/s), cubic metres per hour (m3/h), air changes per hour (ac/h)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do we achieve the passivehaus standard in the UK

A
  • Accurate design modelling using the PHPP (passive house planning package)
  • High levels of insulation
  • High performance windows with insulated frames
  • Airtight building fabric
  • Thermal bridge free construction
  • A mechanically vented system with high heat recovery efficiency
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

VAV is an air conditioning system but what does it stand for.

A

Variable Air Volume.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Cross ventilation is a natural ventilation. What is it.

A

Naturally vented building is windows open on either side.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a very tight building envelope in terms of air changes per hour

A

0.15 to 0.05

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the requirement for air change within a 24h period

A

0.3 air changes per hour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Stack ventilation is a natural ventilation. What is it.

A

similar to cross ventilation, windows open on either side of building with a atrium funnel in the centre, fresh cool air enters the building whilst the warm air rises and escapes through the top of the atrium.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What can drastically reduce heat loss from a building

A

Airtightness

17
Q

What is the minimum air change rate per 24H period

A

0.3 air chages per hour.

18
Q

What is the calculation for ventilation heat loss

A

Volumetric heat capacity of air (J/m3K) x infiltration rate per room (No. air changes per hour) x volume of room (m3) x temp diff between inside & out / 3600

Answer in units is Watts

19
Q

What does CAV stand for

A

Constant Air Volume

20
Q

With regards to air changes, 1 litre / second is equal to what

A

3.6m2 / hour

21
Q

What is Ventilation

A

It’s the deliberate process of replacing air in a space to maintain air quality. It can be minimised but not eliminated.

22
Q

What is the main characteristic of the CAV system

A

Volume of supply air constant but temperature varies

23
Q

50pa is equal to what

A

A 20mph wind.

24
Q

What are the two different types of natural ventilation

A

Cross ventilation and stack ventilation.

25
Q

When we speak about air leakage, we refer to what.

A

Air permeability

26
Q

What is the maximum air leakage rate for new buildings.

A

10m3/m2h@50pa or 0.5 air changes per hour at normal pressure.

27
Q

Ventilation is needed to maintain good air quality but also to remove.

A

Odours, mould, excess humidity and volatile organic compounds.

28
Q

What are the two types of air conditioning systems

A

CAV & SAV

29
Q

What is the main characteristic of the VAV system

A

Temperature of the air supply constsnt but volumes varies

30
Q

What building has an excellent example of cross ventilation

A

The Gherkin, 30 St Mary Axe, London