In case you’re wondering why I said eight instead of nine, recall that barometric pressure is one of the nine I defined in part 2 of this series, and that variable determines the scale of the chart. OK, let’s jump in and place those eight psychrometric quantities on the chart and take a visual look this week. With all the computing power at our fingertips these days, we can get accurate results from smartphone apps and don’t need to try to pull precise numbers off of psych charts. In fact, the chart itself has shifted from being a great calculation tool to being more of an educational or illustrative tool.
(For more on the history and variety of psychrometric charts, see Don Gatley’s book, Understanding Psychrometrics. Aside from that, the other versions of the psychrometric chart out there are mostly specialty charts and curiosities. Richard Mollier from Germany made an important contribution in 1923, as you’ll see in the next section. Willis Carrier was the first, with what he called the hygrometric chart in 1904. On top of all that, having nine different variables means you’ve got a lot of options for how to show them in a chart.Ī lot of folks have been involved in the development of the psychrometric chart over the past century. It also can take a while to figure it all out. As you might expect, taking nine variables and putting them into one chart puts a lot of information at your fingertips. Now we’re going to delve into how we can combine those quantities and create the psychrometric chart. To this point, we’ve taken a look at what exactly psychrometrics is and defined the top nine psychrometric quantities.
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