Psychometery

Question 1

What is pyschrometery?

Answer 1

The study of moist air and the use of these properties to analyse conditions and processes involving moist air.

Question 2

Why is understanding water vapour conditions essential for predicting its interaction and impact on buildings?

Answer 2

Water vapour induces moisture absorption in materials and transport within construction assemblies. It helps determine the air conditioning process as water may need to be introduced or removed.

Question 3

Why use a pyschrometric chart?

Answer 3

To identify properties of most air.
Useful to analyse air conditioning process.

Question 4

Dry bulb temperature

Answer 4

Air temperature measured by thermometer, not affected by moisture

Question 5

Wet bulb temperature

Answer 5

Used together with dry bulb temperature to find the relative humidity

Question 6

Dew point temperature

Answer 6

The temperature at which the moisture would condense if the moist air were cooled at a constant pressure.
Determines if water will be condensed from air when it is cooled.

Question 7

Moisture content

Answer 7

Ratio of the mass of water to the mass of dry air in the mixture.
g= mass of water vapour/ mass of dry air (kg)

Question 8

Percentage saturation

Answer 8

Ratio of the specific humidity of air to the specific humidity of saturated air at the same temperature

Question 9

Specific volume

Answer 9

Volume per kg dry air

Question 10

Specific enthalpy

Answer 10

Heat energy content of humid air per kg dry air