This information forms the basis of the passive design analysis system described above. When hourly data is plotted as points on the graph, and the relative effects of various passive design techniques on the comfort zone are overlayed, it becomes very obvious which systems are most appropriate for any climate. With a range of overlays, a simple visual analysis of such information can actually tell you a lot about the characteristics of a climate. This results in a set of colours ranging from dark blue (occurring quite infrequently) to very light blue (occurring very often). If hourly weather data for a location is known, it is possible to plot this on the chart as frequency data. 8- To draw construction lines to assist in drawing the sloped ceiling, press the Line button, click on the vertex to start, and enter the dimensions. This includes all the major climatic indicators, dry-bulb and wet-bulb temperatures, relative and absolute humidity, vapour pressure, air volume and even enthalpy. The Psychrometric Chart provides a graphic representation of the full state of the air under any condition.
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