Font size
WorksheetsKlimagerechtes Bauen II
Total questions: 34
Worksheet time: 19mins
Which statement is correct regarding a mixed-flow ventilation system?
Supply air needs to enter the room with high speed, so it causes induction with the existing air.
A heat recovery is mandatory to reduce heating demand.
Due to the principle “warm air goes up”, it isn´t possible to heat the room when theoutlets are placed in the ceiling.
A trickle vent has to be in the window frame.
What is the wavelength of visible light?
380 – 870 K
490 – 780 cd
490 - 870 lx
380 - 780 nm
How high is the percentage of heat recovery in a state of the art ventilation system?
90 %
80 %
60 %
30 %
At which temperature should the supply air enter the room, when using a displacementventilation system?
Min. 2 K higher than the room temperature.
Min. 1 K higher than the room temperature.
Min. 3 K higher than the room temperature.
Min. 4 K higher than the room temperature.
The minimum hygienic air change rate in living spaces is 0,5 h-1. This means that:
0,5 m³ of fresh air per hour must be supplied in the room air.
The total room volume is replaced with fresh air every half hour.
Half of the room volume is exchanged with fresh air once per hour.
Fresh air with a volume of 0,5% of the room volume is supplied to the
When using a mixed-flow ventilation system, which outlet system is able to reach high distances?
Jet noozle
Popper valve
Swirl diffuser
Slot diffuser
Which of the following gases has the highest concentration in the air?
Carbon dioxide
Nitrogen
Hydrogen
Oxygen
Above which value of the brightest surface do you get a risk of glare on your working desk, when the darkest surface on the desk provides a luminance of 200 cd/m²?
600 cd/m²
800 cd/m²
400 cd/m²
200 cd/m²
11.Which is the tolerance range of the reverberation time for a music room, according to DIN 18141?
(a)
What information do you get from the SHGC value?
How much light is transmitted through the opaque components like walls.
How much energy is transmitted through the opaque components like walls.
How much energy is transmitted through transparent components like windows.
How much light is transmitted through transparent components like windows.
Which of the following attributes of an artificial light source would be the most important in an art gallery?
High colour rendering index
High luminous efficiency
High light colour
High colour temperature
Which type of heat recovery system allows moisture recovery?
Counter-flow heat exchanger
Cross-flow heat exchanger
Run-around coil
Rotary heat exchanger
What is the illuminance of a clear sunny sky?
100.000 lx
500.000 lx
50.000 lx
10.000 lx
Your clients interior designer wants the east oriented office room´s interior completely in white. This includes the white internal shading device. What would you suggest in terms of solar heat gains?
A black internal shading device, because it absorbs the solar heat gains best.
Because solar heat gains of the east façade are negligible. A white internal shading device is reasonable.Fixed vertical blinds on the outside.
An overhang of at least 1 meter on the outside.
Fixed vertical blinds on the outside.
Which of the following metrics would be the least suitable to evaluate daylight in a building located in a desert climate?
Daylight autonomy (DA)
Daylight factor (DF)
Continuous daylight autonomy (cDA)
Useful daylight illuminance (UDI)
Which parameter – besides pressure differences – causes natural air exchange on an opening in the façade?
(a)
Which of the following definitions of white is available for LED?
Pale white
Neutral white
Uncoloroued white
Shine white
An apartment building is equipped with a centralized mechanical ventilation system to provide hygienic comfort for the inhabitants. Which of the following rooms would usually not get supply air from the ventilation system?
Children's room
Living room
Bathroom
Sleeping room
Which air speed should be not exceeded at the outlet of a displacement ventilation system?
0,3 m/s
0,4 m/s
0,2 m/s
0,1 m/s
Which of the following contaminations in the air can not be measured with a device?
Humidity
CO2
VOCs
Odours
To which light measurement metric belongs the unit “Candela/m²”?
Illuminance
Luminous flux
Luminous intensity
Luminance
How high is the CO2 concentration of the outdoor air?
400 ppm
1000 ppm
150 ppm
2450 ppm
In which building typology is a displacement ventilation system usually not used?
Museum
Residential
School
Office
What is the main characteristic of hybrid ventilation systems?
Running the mechanical ventilation system both with power (through photovoltaics)and gas (when no sunshine)
Installation of air inlets and air outlets of the mechanical ventilation system in thesame room.
Running a lower air change rate by the mechanical system than requested and combining it with natural ventilation.
Changing the sizes of the fans in the central ventilation unit from smaller in summerto bigger in winter.
What is adiabatic cooling?
The air is getting cooled through the evaporation of water.
The air is getting humidified with a steam vaporizer and thus cools
The air is cooled by a cooling coil that is powered by a compressor.
Cooling the room through the air outlets n the suspended ceiling.
Which statement is correct?
Speed of sound is independent of the medium's temperature.
In air speed of sound is faster than in water.
Speed of sound can not get higher than in a vacuum.
The more mass of a medium, the faster the speed of sound.
What is the main difference between the factor daylight autonomy (DA) and continuous daylight autonomy (cDA)?
While DA inly credits hours where the minimum illuminance level is maintained bydaylight alone, cDA counts partial credit to time steps where illuminance is lowerthan the requirement.
DA results a value where minimum illuminance level is maintained by daylight at aspecific moment in time, whereas cDA considers all occupied hours throughout theyear with different sky conditions and all shading devices in the space.
Compared to DA, which only credits hours where the minimum illuminance level ismaintained by daylight alone, cDA describes the relationship of daylight at a specifictime step where the required minimum illuminance is reached, e.g. illuminance is400lx with a requirement of 500lx, so cDA = 80%.
DA gives the result for the occupied hours per year of every single point in the roomwhere minimum illuminance level is maintained by daylight, while cDA gives onenumber as a result for the whole space.
What is the definition of reverberation time?
Time to drop 60dB below original level.
Time to drop from 60dB(A) to 0dB(A).
Time to drop from 60dB to 0dB.
Time longer than 0,6 seconds to drop 1dB.
A centralized and a decentralized mechanical ventilation system are two different ways of generating a mechanical air exchange in a building. Name one advantage for each option, compared to each other.
(a)
Which of the following devices/materials reduces reverberation time in a room the least?
Sound baffles
Resonating panels
Plane aluminium panles
Fabric curtains
Which statement is not correct?
Airborne sound can only be reduced by transforming sound energy to heat energy.
Structure-borne sound can be reduced by using elastic and porous lightweight materials.
Sound absorption coefficient of a carpet is higher than of linoleum.
Using sound baffles reduces effectiveness of thermo-active slab systems.
Natural ventilation and mechanical ventilation are two different ways of generating air exchange in a building. Name one advantage for each option, compared to the other.
(a)
Which amount of air should be replaced in a room in order to maintain the Pettenkoferstandard of 1.000 ppm?
25 m³/s
25 m/s per person
25 h-1
25 m³/h per person
As a rule of thumb, to which depth of a room can you use cross ventilation?
Five times the hight of the room.
Natural ventilation only works in the first 5 meters of the room, independent ofother factors.
Room depth doesn´t matter, the fresh air goes everywhere.
It is triple the height of all windows in the room.
