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4.1. The Mollier diagram for moist air (figure 7.1.)
The Mollier diagram for moist air (published in 1923), is a powerful tool for the study of climatic conditions and of the measures taken to modify them. The Mollier diagram allows the relationship between temperature and relative humidity to be seen, without recourse either to calculation or to tables.The Mollier diagram used here is the so called h-x diagram, giving the relationship between heat content h, and water vapour content x of air.Each point on the diagram shows a calculated heat content (enthalpy), see section 1.11. It is further characterised by bold curved lines for constant temperature, moisture content, relative humidity and enthalpy.
Each diagram is drawn for a particular atmospheric pressure 8, mostly 1013.25 mbar(760 mm mercury column or 101.325 kPa).
It does not use a right-angled set of coordinates, otherwise the enthalpy lines would be horizontal. For clarity, it is drawn at an angle.
The diagram permits changes in conditions to be followed without the necessity for extensive calculation.
In dealing with the problems that occur, it is essential to take account both of the many phases of culture, and of the variations in external climate.
The use of the diagram will be illustrated with a number of simple examples based on 1 kg dry air containing varying amounts of moisture vapour, both still and moving.
Figure 7.1.(请提供Email信箱,以便发此图)
The Mollier diagram gives the relationship between the heat content h, and the water vapour content x, of the air. It is available for altitudes other than sea-level, and also for other temperature ranges, from the Technische Vereniging voor Verwarming en Luchtbehandeling (T.VVL.) in Amersfoort. [The Technical Society for Heatinq and Air Handling].
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