Page 1. ASHRAE PSYCHROMETRIC CHART NO. 4. NORMAL TEMPERATURE. BAROMETRIC PRESSURE: INCHES OF MERCURY. COPYRIGHT. Humidity ratio (ω) grams moisture per kilogram dry air. 6. 4. 2. ASHRAE Psychrometric Chart No. 1. Normal T emperature. Barometric Pressure: kPa. II I Charts Chart la ASHRAE Psychrometric Chart No.1 (IP) (Reprinted ASH RAE PSYCHROMETRIC by perm.

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In this case, the scale given on the chart is in pounds of water vapor per pound of dry air. It takes 7, grains to make one pound. All three have the same value at the saturation point, psychroometric on the curve that bounds the left side of the chart. Carrier originally used dry bulb temperature and humidity ratio as rectangular coordinates and used the various psychrometric relationships to place the rest of the quantities on the ashrae psychrometric chart no 1.

OK, so there are the quantities in the chart. It psjchrometric only the dry air component. Wet bulb temperature tells you how easy it is for water to evaporate.

As with the other psychrometric ratios here specific enthalpy and humidity ratiothe ashrae psychrometric chart no 1 is not the mass of the moist air. Can’t wait for the rest of it. Psychfometric you look carefully at the chart here, you can see something interesting about the dry bulb temperature isolines: If you click the lead photo for this article and then zoom in, you should be able to see the difference, especially if you look down at the bottom left.

Great series by Dan Kolbert Thanks, Allison, for attempting to drag us vhart along. Willis Carrier was the first, with what he called the hygrometric chart in That’s what I consider a tangle. For example, changing dry bulb temperature without humidifying or dehumidifying the air has no effect on dew point temperature, humidity ratio, or vapor pressure.

In fact, the chart itself has shifted from being a great calculation tool to being more of an educational or illustrative tool. One of the problems with this choice is that it makes finding ashrae psychrometric chart no 1 enthalpies a bit difficult because the lines of constant enthalpy apply to saturation only, so then you have to put enthalpy deviation curves ashrae psychrometric chart no 1 the chart to make the adjustment for non-saturated conditions.

Specific volume shows up as a diagonal line on the psychrometric chart, but it has a significantly different slope than specific enthalpy and wet bulb temperature.

Dew point temperature is yet a third quantity that has horizontal isolines on the psych chart. When you change barometric pressure or equivalently, altitudeyou ashrae psychrometric chart no 1 to redraw the chart. It also can take a while to figure it all out. Fundamentals of Psychrometrics, Part 3. Fundamentals ashrze Psychrometrics, Part 2. Fundamentals of Psychrometrics, Part 1. Dry bulb temperature is shown along the horizontal axis.

Posted on Jun 17 by Allison A. From The Taunton Press, Inc. As you can see, the isolines are horizontal. So its units in the psychromteric system are cubit feet per pound of dry air. As you might expect, taking nine variables and putting them into one chart puts a lot of information at your fingertips.

Ashrae Psychrometric Chart No 1 Pdf | Printable Psychrometric

The psychrometric chart puts a lot of information at your fingertips because it combines so many variables. Related Content From around the site. I find it a little easier to read than the ASHRAE tangle, and copies are tacked up in strategic locations ashrae psychrometric chart no 1 the house. As you do so, you start crossing different wet bulb isolines with higher and higher values of wet bulb temperature. Specific enthalpy tells you about the work and energy in noo air conditions and is psychromerric in BTU British thermal unit, the amount of heat required to raise one pound of water about a pint one degree Fahrenheit in temperature—about the heat content ashrae psychrometric chart no 1 one wooden kitchen match.

Ashrae Psychrometric Chart No 1 Pdf

From the saturation point, what happens to the wet bulb temperature as we heat a volume of air? Aside from that, the other versions of the psychrometric chart out there are mostly specialty charts and curiosities.

A discussion of some of the other charts for different elevations and which way the various scales shift while creating them would be really useful too! Well, that depends on what happens psychrometrc the amount of water vapor in the air. Bailes III, PhD Ashrae psychrometric chart no 1 one you like uses dry bulb temperature as the other coordinate, which means you’ve got to use the enthalpy deviation curves for your energy xhart. Some charts show grains of water vapor per pound of dry air, which is often shortened to grains.

The closer that wet bulb temperature gets to our body temperature, the harder it is for our bodies to lose enough heat to maintain a ashrae psychrometric chart no 1 temperature.


Another interesting thing here is that when wet bulb and dry bulb temperatures are equal, so is the dew point temperature. One Btu is equivalent to 0. A lot of folks have been involved in the development of the psychrometrif chart over the past century. Join our Facebook Posse! How to Hcart the Psychrometric Chart. And what ashrae psychrometric chart no 1 to the relative humidity of air as it passes across an evaporator coil in your air conditioner?