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15 Cards in this Set
- Front
- Back
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Name two instruments that measure the following properties?
a) Air Temperature; |
Dry Bulb thermometer
Sling thermometer Digital thermometer |
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Name two instruments that measure the following properties?
b) Air Velocity; |
Anemometer
Kata Nomogram |
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Name two instruments that measure the following properties?
c) Mean Radiant Temperature; |
Globe themometer (GBT)
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Name two instruments that measure the following properties?
d) Wet bulb tmeperature |
Whirling hydrometer
Sling thermometer |
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Name two instruments that measure the following properties?
e) Dry bulb temperature |
Mercury in glass thermometer
Dry bulb from sling thermometer or whirling hydrometer |
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Describe the 6 common factors of thermal comfort, naming their units.
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Met Rate / mets (Activity)
Clothing / clo Air Temperature / oC or K Radiant Temperature / oC or K Air Velocity / m/s Relevant humidity / % |
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Define Temperature:
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condition of a body which determines whether heat flows from it. Measure in Kelvin or degrees celcius
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Define Heat
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A form of energy, often refered to as thermal energy. Measured in Joules
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Kelvin
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SI unit for temperature. Scale based upon a base of 'absolute zero'.
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Latent Heat
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The point at which the temperature of a substance remains the same during a change of state. The change in state requires all of the energy, so no temperature change.
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Conduction
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the transfer of energy from one body to another.
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Describe how heat is lost from a building through conduction and some of the techniques
used to control this type of heat loss |
Define Conduction.
Thermal Bridging Windows |
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Given that 1 clo provides a thermal resistance (R) of 0.155 m^2.K.W^-1, how many clo would
a winter jacket provide if it was made from 15mm thick wool that had a thermal conductivity (λ) of 0.04W.m^-1.K^-1? |
Using R = x / λ:
R = 0.015/0.04 = 0.375 0.375 / 0.155 = 2.42 clo |
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Describe the ways that heat may be lost from a building through convection
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Controlled - Ventilation & Trickle Vents
Uncontrolled - Use of doors & Leakage around windows & Uninsulated Ventilated Loft Space |
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A lecture room of volume 1200 m³ contains 250 seats. A minimum rate of fresh outside air
ventilation of 8 litres/s is to be provided by a mechanical ventilation system. What is the ventilation rate, expressed in air-changes per hour? |
Knowing 1 airchange = 15 m3/hour
1 m3 = 1000 litres => 15000 l/hr 3600 X 8 = 28800 l/hr 28800 / 15000 = 1.92 ach |
