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BUILDING PHYSICS > TRUE/FALSE > Flashcards

TRUE/FALSE Flashcards

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
Q

The luminous efficacy of a lamp quantifies its capability of transforming electricity into visible light

A

TRUE

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26
Q

The photometric solid shows the luminous intensity values emitted by a luminaire

A

TRUE

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27
Q

The visibility factor describes the spectral sensitivity of human visual system and is expressed in [lm/W]

A

TRUE

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28
Q

The utilization factor UF is defined as the luminous flux emitted by a luminaire and the luminous flux emitted by the sources in it

A

FALSE
By Internal (lighhts, pp, equipments) and Solar

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29
Q

The sound power lever typically ranges from 0dB to 120 dB (pain threshold)

A

TRUE

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30
Q

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

A

FALSE
The sound pressure level DECREASE OF 60 dB

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31
Q

According to the “mass law”, the Sound Reduction Index of a component depends on its thickness

A

TRUE

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32
Q

The sound absorptance power of a material is the ratio of the sound power that is absorbed to the power hitting the material

A

FALSE
Power absorbed to power transmitted

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33
Q

The Sound Intensity is the sound power emitted by a sound source along a given direction

A

FALSE
“A given direction” is WRONG
ALL AROUND THE SURROUNDING SPACE

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34
Q

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

A

TRUE

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35
Q

According to Weber-Fecher’s law, the sensation depends on the spectral sensitivity of the human hearing system

A

FALSE
The variation of the sensation level is proportional to the variation of the stimulus referred to the initial stimulus

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36
Q

For a frequency of 1000Hz, the human hearing system can perceive a sound with a sound intensity of 10^ -14 W/m2

37
Q

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

38
Q

Vibration panels are useful to increase the sound insulation properties of the wall

39
Q

The U-value changes if the position of the insulating layer within the wall is changed

A

FALSE
All the same

40
Q

The laminar (surface) heat exchange coefficient is expressed in [W/m2 C]

41
Q

A low-emitting (low ε) glazing is useful to reduce the thermal losses in winter

42
Q

According to Boltzmann’s law, the emission power of a grey body depends on its emissivity

43
Q

The thermal inertia of a wall represents its attitude to reduce heat losses in winter

A

FALSE
Thermal inertia: SUMMER

44
Q

A material with a thermal conductibility value of about 0,05 W/mK can be used to reduce the thermal exchange for radiation

45
Q

The Color irradiance is expressed in [W]

46
Q

Incrasing the thickness of a wall is useful to increase its time-phase and hence its thermal inertia

47
Q

A tinted glazing presents a reduced value of the solor heat gain coefficient (g-value) compared to a clear glazing

48
Q

The sound absorptance power quantifies the insulation properties of a component

49
Q

The Sound Intensity is the sound power emitted by a sound source along a given direction

50
Q

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

51
Q

Double pane glazing are the best technology to increase the Sound Reduction Index value

52
Q

Acoustical resonators are useful to increase the sound insulation properties of the wall

53
Q

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

54
Q

The visible absorptance value of a tinted glazing depends its color

55
Q

The Waldram diagram can be used to calculate the daylight factor at a point in a room

56
Q

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

57
Q

The luminous flux is expressed in [W]

A

FALSE
Luminous flux: lm

58
Q

The light reflected of a glossy metal is Lambertian (perfect diffusion)

59
Q

Luminance is expressed in [cd]

A

FALSE
Illuminance: lx
Luminous intensity: cd

60
Q

A component having a high value of mass density performs a good thermal inertia

61
Q

The vapor permeability of a material is expressed in [kg/sm2Pa]

A

FALSE
(Water) Vapor permeability: W/m2K4

62
Q

Low-emitting glazing are useful to reduced the thermal losses in winter

63
Q

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

64
Q

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

A

FALSE
Depends on transmittion, absorption

65
Q

Specific heat describes the thermal insulation capability of a material

A

FALSE
Specific heat (c): heat needed to increase 1 degree temperatye of 1kg mass of body

66
Q

Specific humidity quantifies how close an air max is to the saturation point

A

FALSE
“how close an air max to saturation point” sounds wrong

67
Q

A “coat” insulation is useful to prevent from thermal bridges

68
Q

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

69
Q

Solar gains are taken into consideration is the calculation process of winter design thermal load

A

FALSE
Summer desgin

70
Q

According to Boltzmann’s law, the emission power of a grey body depends on its emissivity

71
Q

The thermal inertia of a wall represents its attitude to reduce heat losses in winter

A

FALSE
Thermal inertia: SUMMER

72
Q

The thermal exchange for conduction is greater in a solid material than in a fluid

73
Q

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

74
Q

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

A

FALSE
NO internal laminar resistance

75
Q

A material with a thermal conductibility value of about 0,05 W/mK can be used to reduce the thermal exchange for radiation

76
Q

A heat recovery system HRS is highly beneficial to reduce the thermal losses for transmission through opaque components

77
Q

The solar gains admitted into a room through a transparent component depend on the g-value and on the glazing area

78
Q

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

A

FALSE
Ratio of energy demand to maintain indoor comfort temperature throughout heating season to the necessary primary energy

79
Q

Increasing the thickness of a wall is useful to increase its time-phase and hence its thermal inertia

80
Q

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

81
Q

A low-emitting glazing can be used to reduce overheating in summer

A

FALSE
Use in WINTER to reduce heat exchange

82
Q

The solar irradiance is expressed in [W]

A

FALSE
Solar irradiance: W/m2

83
Q

The U-value depends on the position of insulating layer within the wall

A

FALSE
All the same

84
Q

Solar and internal gains are taken into account in the procedure to calculate the energy demand for heating in the certification process

85
Q

Overhangs are effective shading system for south-facing windows in summer

86
Q

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

A

FALSE
Unit less

87
Q

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)

88
Q

The relative humidity is expressed in [kgv/kga]

A

FALSE
Relative humidity: %
Specific humidity: kgv/kga

BUILDING PHYSICS (1 decks)

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