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BUILDING PHYSICS > TRUE/FALSE > Flashcards

TRUE/FALSE Flashcards

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1
Q

The vapor permeance M of a multi layer wall is expressed in [kg/m^2Pa]

A

FALSE
kg/m^2sPa

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2
Q

The g-value of a glazing depends on the wavelength of the radiation that hits it

A

FALSE

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3
Q

Internal gains must be taken into consideration in the calculation process of the winter design thermal load

A

FALSE
Winter design: worst case scenario: NO solar, NO internal gain

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4
Q

A Heat Recovery System HRS is useful to reduce thermal losses for transmission

A

TRUE

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5
Q

A selective glazing is an useful technology to install to reduce the solar gains admitted into a room

A

TRUE

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6
Q

Determining the temperature profile across a multi-layer wall is necessary to proceed to the verification of interstitial condensation

A

TRUE

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7
Q

The energy performance index of an educational building is expressed in [W/m2]

A

FALSE
Unitless

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8
Q

The use of green roofs and green facade instead of cement envelope components is useful to reduce Urban Heast Islands UHIs

A

TRUE

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9
Q

Specific heat describes the insulation capability of 1 kg of material

A

FALSE
Heat that need to increase 1kg of material

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10
Q

Relative humidity describe how close a mix or gasses is to the saturation point

A

FALSE
Relative humidity: phi [%]

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11
Q

According to Dalton’s laws, the total pressure of a mix of gasses is given by the sum of partial pressures of each component of the mix

A

TRUE

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12
Q

The mass flow is expressed in [m3/kg]

A

FALSE
Mass flow: kg/s
Volume flow: m3/kg

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13
Q

The wet bulb point can be reasched through a cooling down transformation following a iso-specific humidity

A

FALSE
Iso enthalpy

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14
Q

The relative humidity of a mix of two mass flows is given by the mass flow-weighted average of the two individual relative humidities of the two individual flows

A

FALSE
Sum of partial pressures of each component

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15
Q

The emissivity of a low-emitting glazing is typically lower than 0,2

A

TRUE

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16
Q

According to Planck’s law, for a grey body, the emission power depends on its emissivity, its absolute temperature and the wavelength of the radiation

A

TRUE

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17
Q

The thermal flux that is exchanged for radiation between two surfaces depends on the 2 emissivity of the 2 surfaces; the absolute temperature and their multual position

A

FALSE?
Radiation thermal flux just need 1 emissivity?

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18
Q

The thermal transmittance of a material describes its thermal intertia properties

A

FALSE

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19
Q

Daylight Factor measured in a room with a south-facing window is greater than the Daylight Factor measured in the sameroom, but with window is facing north

A

FALSE
ALl the same, it effect more on the area of window than the direction

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20
Q

According to its definition, the window factor ε accounts for the fraction of window area that is covered by the frame

A

FALSE
For obstructed or unobstructed

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21
Q

A clear glazing is transparent in the far IR spectrum (wavelengths > 3um)

A

FALSE
NO glazing is transparent

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22
Q

A room hall walls painted green and the ceiling made of unpainted dark concrete. After a renovation, both the walls and the ceiling are painted white. This results in a decrease in average daylight factor

A

FALSE
The result does not affect in average daylight factor

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23
Q

The average maintained illuminance also accounts for the dust conditions inside the considered room

A

TRUE

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24
Q

The Correlated Color Temperature describes how truthfully colors are rendered under a considered light

A

FALSE
The tonality of color of a light that a source is compare to the radiation emitted by a black body.

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25
The luminous efficacy of a lamp quantifies its capability of transforming electricity into visible light
TRUE
26
The photometric solid shows the luminous intensity values emitted by a luminaire
TRUE
27
The visibility factor describes the spectral sensitivity of human visual system and is expressed in [lm/W]
TRUE
28
The utilization factor UF is defined as the luminous flux emitted by a luminaire and the luminous flux emitted by the sources in it
FALSE By Internal (lighhts, pp, equipments) and Solar
29
The sound power lever typically ranges from 0dB to 120 dB (pain threshold)
TRUE
30
The conventional reverberation time is defined as the time that elapses between the momnet when a source stop emitting and the moment where the sound pressure level reaches the value of 60dB
FALSE The sound pressure level DECREASE OF 60 dB
31
According to the "mass law", the Sound Reduction Index of a component depends on its thickness
TRUE
32
The sound absorptance power of a material is the ratio of the sound power that is absorbed to the power hitting the material
FALSE Power absorbed to power transmitted
33
The Sound Intensity is the sound power emitted by a sound source along a given direction
FALSE "A given direction" is WRONG ALL AROUND THE SURROUNDING SPACE
34
Porous materials can be usefully used to correct the acoustical quality of a classroom, when the conventional reverberation time exceeds the optimal reverberation time at high frequencies
TRUE
35
According to Weber-Fecher's law, the sensation depends on the spectral sensitivity of the human hearing system
FALSE The variation of the sensation level is proportional to the variation of the stimulus referred to the initial stimulus
36
For a frequency of 1000Hz, the human hearing system can perceive a sound with a sound intensity of 10^ -14 W/m2
FALSE
37
For a frequency of 125Hz, a sound with an acoustical intensity of 10^ -14 W/m2 has a corresponding intensity sound level of 80dB and also sensation of 80Ph
FALSE
38
Vibration panels are useful to increase the sound insulation properties of the wall
FALSE
39
The U-value changes if the position of the insulating layer within the wall is changed
FALSE All the same
40
The laminar (surface) heat exchange coefficient is expressed in [W/m2 C]
TRUE
41
A low-emitting (low ε) glazing is useful to reduce the thermal losses in winter
TRUE
42
According to Boltzmann's law, the emission power of a grey body depends on its emissivity
TRUE
43
The thermal inertia of a wall represents its attitude to reduce heat losses in winter
FALSE Thermal inertia: SUMMER
44
A material with a thermal conductibility value of about 0,05 W/mK can be used to reduce the thermal exchange for radiation
FALSE
45
The Color irradiance is expressed in [W]
FALSE
46
Incrasing the thickness of a wall is useful to increase its time-phase and hence its thermal inertia
TRUE
47
A tinted glazing presents a reduced value of the solor heat gain coefficient (g-value) compared to a clear glazing
FALSE
48
The sound absorptance power quantifies the insulation properties of a component
FALSE
49
The Sound Intensity is the sound power emitted by a sound source along a given direction
FALSE
50
According to the ISO normal audiogram, a sound at 1000Hz and a sound at 200 Hz, which have the same subjective sensation, also have the same pressure
FALSE
51
Double pane glazing are the best technology to increase the Sound Reduction Index value
FALSE
52
Acoustical resonators are useful to increase the sound insulation properties of the wall
FALSE
53
The average maintained illuminance also accounts for the dust conditions inside the considered room
TRUE
54
The visible absorptance value of a tinted glazing depends its color
TRUE
55
The Waldram diagram can be used to calculate the daylight factor at a point in a room
TRUE
56
In the same room, the Utilization Factore of Luminaries ceiling-mounted with downlight emission is higher than having the same luminaires wall-mounted with uplight emission
TRUE
57
The luminous flux is expressed in [W]
FALSE Luminous flux: lm
58
The light reflected of a glossy metal is Lambertian (perfect diffusion)
FALSE
59
Luminance is expressed in [cd]
FALSE Illuminance: lx Luminous intensity: cd
60
A component having a high value of mass density performs a good thermal inertia
TRUE
61
The vapor permeability of a material is expressed in [kg/sm2Pa]
FALSE (Water) Vapor permeability: W/m2K4
62
Low-emitting glazing are useful to reduced the thermal losses in winter
TRUE
63
The thermal transmittance U-value describes the thermal flux transferred through 1 square meter of component due to a temperature difference of 1 degree Kelvin, for convection and radiation
FALSE
64
The g-value of a glazing depends on the irradiance that hits it
FALSE Depends on transmittion, absorption
65
Specific heat describes the thermal insulation capability of a material
FALSE Specific heat (c): heat needed to increase 1 degree temperatye of 1kg mass of body
66
Specific humidity quantifies how close an air max is to the saturation point
FALSE "how close an air max to saturation point" sounds wrong
67
A "coat" insulation is useful to prevent from thermal bridges
TRUE
68
The thermal transmittance of a double pane glazing is calculated as surface-weighted average of the two U-values of glazing and frame, and also accounting for the thermal bridge due to the spacer
TRUE
69
Solar gains are taken into consideration is the calculation process of winter design thermal load
FALSE Summer desgin
70
According to Boltzmann's law, the emission power of a grey body depends on its emissivity
TRUE
71
The thermal inertia of a wall represents its attitude to reduce heat losses in winter
FALSE Thermal inertia: SUMMER
72
The thermal exchange for conduction is greater in a solid material than in a fluid
TRUE
73
The thermal flux exchanged for ventilation depends on the air exchange rate, which is set by Italian standards as a function of the room usage
TRUE
74
The sun-air temperature is a dictitious temperature which is used in the presence of solar radiation hitting an opaque component; it is determined as a function of the incident solar irradiance and of the internal laminar resistance
FALSE NO internal laminar resistance
75
A material with a thermal conductibility value of about 0,05 W/mK can be used to reduce the thermal exchange for radiation
FALSE
76
A heat recovery system HRS is highly beneficial to reduce the thermal losses for transmission through opaque components
FALSE
77
The solar gains admitted into a room through a transparent component depend on the g-value and on the glazing area
TRUE
78
The efficacy of a heating system is defined as the ratio of the thermal energy that it emits (and supplied to the space to be heated) to the thermal losses through the envelope
FALSE Ratio of energy demand to maintain indoor comfort temperature throughout heating season to the necessary primary energy
79
Increasing the thickness of a wall is useful to increase its time-phase and hence its thermal inertia
TRUE
80
So as to prevent from interstitial condensation (in-the-mass condensation) to occur, it is necessary that for each layer the vapor pressure be lower than the saturated vapor pressure
TRUE
81
A low-emitting glazing can be used to reduce overheating in summer
FALSE Use in WINTER to reduce heat exchange
82
The solar irradiance is expressed in [W]
FALSE Solar irradiance: W/m2
83
The U-value depends on the position of insulating layer within the wall
FALSE All the same
84
Solar and internal gains are taken into account in the procedure to calculate the energy demand for heating in the certification process
TRUE
85
Overhangs are effective shading system for south-facing windows in summer
TRUE
86
The energy performance index of an educational buildling expressed in [W/m2]
FALSE Unit less
87
In the energy certification procedure to calculate the energy demand for heating of a building, obstructions are taken into account throughout the heating season (month by month)
TRUE
88
The relative humidity is expressed in [kgv/kga]
FALSE Relative humidity: % Specific humidity: kgv/kga

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