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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A lot of folks have been involved in the development of the psychrometric chart over the past century. Dew point temperature is yet a third quantity that has horizontal isolines on the psych chart. It takes 7, grains to make one pound.

Bailes III, Ashrae psychrometric chart no 1 The one you like uses dry bulb psychromrtric as the other coordinate, which means you’ve got to use the enthalpy deviation curves for your energy calculations.

Ashrae Psychrometric Chart No 1 Pdf

Posted on Jun 17 by Allison A. Fundamentals of Psychrometrics, Part 3.

As you do so, you start crossing different wet bulb isolines with higher and higher values of wet bulb temperature. From the saturation point, what happens to the wet bulb temperature as we heat a volume of air?

When you change ashrae psychrometric chart no 1 pressure or equivalently, altitudeyou need to redraw the chart. 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.

From The Taunton Press, Inc.

And what happens to the relative humidity of air as it passes across an evaporator coil in your air conditioner? Related Content From around the site. By studying those individual charts, you can see how the psychrojetric quantities change. 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 stable temperature.


Psyychrometric 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. International organization dedicated to the advancement of heating, ventilation, air conditioning, and refrigeration through research, standards writing, publishing, and continuing education.

The psychrometric chart puts a lot of information at your fingertips because it combines so many variables. In fact, the chart itself has shifted from being a ashrae psychrometric chart no 1 calculation tool to being more of an educational or illustrative tool.

Dry bulb temperature is shown along the ashrae psychrometric chart no 1 axis.


Fundamentals of Psychrometrics, Part 1. Another interesting thing here is that when wet bulb and dry bulb temperatures are equal, so is the dew point temperature.

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! Specific enthalpy tells you about the work and energy in changing air conditions and is given in BTU Ashrae psychrometric chart no 1 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 of one ashrae psychrometric chart no 1 kitchen match.

If you look carefully at the chart here, you can see something interesting about the dry bulb temperature isolines: In this case, the scale given on the chart is in pounds of water vapor per pound of dry air. Fundamentals of Psychrometrics, Part 2.

Well, that depends on what happens to the amount of water vapor in the air. Join our Facebook Posse! As you can see, the isolines are horizontal. Can’t wait for the rest of it.

Fundamentals of Psychrometrics, Part 3

OK, so there are the quantities in the chart. One Btu is equivalent to 0. I find it asrhae little easier to read than the ASHRAE tangle, and copies are tacked up in strategic locations around the house. If you click the lead photo for this article and then ashrae psychrometric chart no 1 in, you should be able to see the difference, especially if you look down at the bottom left.


Willis Carrier was the first, with what he called the hygrometric chart in Great series by Dan Kolbert Thanks, Allison, for attempting to drag us adhrae along.

It includes only the dry air component.

As with the other psychrometric ratios here specific enthalpy and humidity ratiothe denominator is not the mass of the moist air. Some charts show grains of water vapor per pound of dry air, which is often shortened to grains.

Aside from that, the other versions of the psychrometric chart out there are mostly specialty charts and curiosities.

It also can take a while to figure it ashrae psychrometric chart no 1 out. All three have the same value at the saturation point, shown on the curve that bounds the left side of the chart.

Wet bulb temperature tells you how easy it is for water to evaporate. Carrier ashrae psychrometric chart no 1 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 chart.

So its units in the imperial system are cubit feet per pound of asheae air. One of the problems with this choice is that it makes finding specific enthalpies a bit difficult because the lines of constant enthalpy apply to saturation only, so then you have ashrae psychrometric chart no 1 put enthalpy deviation curves on the chart to make the adjustment for non-saturated conditions.

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