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Building Physics > Thermal Comfort And Thermal Performance > Flashcards

Thermal Comfort And Thermal Performance Flashcards

1
Q

Factors used to predict thermal comfort

A
  • activity
  • clothing
  • air temperature (dry bulb)
  • mean radiation temperature
  • relative humidity (dry and wet bulb)
  • air velocity (thermal anemometer)
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2
Q

Normal human body temperature

A

37 degrees

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3
Q

What is body metabolism measured in?

A

Met

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4
Q

Temperature of air is building is affected by…

A
  • external air temp
  • thermal effect of the structure (insulation and air permeability)
  • heat added by heating systems
  • heat added as a by prouduct (IT, people etc)
  • solar gain
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5
Q

Mean radiant temperature (MRT)

A

Measure of the average temperature of the surfaces that surround a particular point with which it will exchange thermal radiation

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6
Q

Thermal conductance

A

How well a material allows the passage of heat

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7
Q

Resistance

A

A calculated value on how well a material resists the transmission of heat

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8
Q

U values

A

A calculated value on how well an individual wall transmits heat energy

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9
Q

Vapour pressure

A

Pressure of molecules of the vapour, dependent on air temperature

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10
Q

Dew point temperature

A

The temperature to which a sample of air becomes saturated and can hold no more moisture

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11
Q

Relative humidity

A

Defined in terms of actual vapour pressures against saturated vapour pressure

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12
Q

Moisture content

A

Quantity of water per unit of air

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13
Q

Percentage saturation

A

Defined in terms of actual moisture content against saturated moisture content

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14
Q

Infiltration

A

Leakage of air into or out of a building

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15
Q

2 instruments that measure air temp, air vel, mean radiant temp, relative humidity

A 
Whirling hygrometer (dry and wet bulb) 
Globe thermometer
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16
Q

Latent heat

A

Heat required to convert a solid into liquid or liquid into vapour without change of temp

17
Q

Low e glass

A

Minimise under red and ultra violet

18
Q

Diurnal temperature variation

A

The variation between a high temperature and a low temperature

19
Q

How to reduce risk of condensation

A

Ventilate
Dry line
Heat appropriately

20
Q

Properties for insulation

A 
Rigid
Moisture resistant
Fire resistant 
Resistant it pests 
Compatible with adjacent materials 
Harmless to humans and environment

Building Physics (8 decks)

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