Psychrometric chart pdf

complex (Figure 1). After you have completed creating the chart, you can email a list of all the points and their properties along with a PDF of the chart, itself. pdf · MIXING PROCESS [a]Adiabatic Mixing of Air streams [b] Mixing Process on Psychrometric chart The Psychrometric Chart Properties of Air At first glance, the psychrometric chart appears to be an imposing network of lines. Psychrometric Charts • Humid airHumid air • Useful for drying and humidification or d h idifi i ( i di i i )dehumidification (air conditioning) problems • Much faster than working through full material and energy balance calculations by hand • Basis is 1 kggy of bone dry air Psychrometric Chart Department of Mechanical Engineering National Institute of Technology Jamshedpur Jharkhand 831014 India Psychrometric chartis aconcisechartwhich can be readily looked up for relevant information suchas all the properties discussedpreviously in this slide. o Standard Psychrometric Chart free download and preview, download free printable template samples in PDF, Word and Excel formats ashrae psychrometric chart no. Describe Psychrometric Properties 3. 50 0. THE PSYCHROMETRIC CHART AND ITS USE Psychrometry is an impressive word which is defined as the measurement of the moisture content of air. 10. 921 inches of mercury copyright 1992 Psychrometric Properties using the Chart 7 Given: Moist air mixture in our classroom; T, T wb measured with a sling psychrometer. Unfortunately, many texts and programs of instruction introduce the science of Psychrometrics by explaining the Psych Chart!” Psychrometric Chart to: Id if h i f i i di iIdentify the properties of air at a given state condition Illustrate the performance characteristics of basic heating andcoolingprocessesand cooling processes Demonstrate how the use of Energy Recovery devices can reduce heating and cooling loads in building designs 3 ME 201 Thermodynamics Psychrometric Chart The Psychrometric Chart So what is a psychrometric chart and why would anyone want to use it? The psychrometric chart is a convenient and useful tool for (1) determining moist air psychrometric properties, and (2) visual-izing the changes of properties in a se-quence of psychrometric processes; e. The following is a summary of the major elements on the chart. The relative humidity. The Psychrometric Chart. 0 3. 210 F 0. DESCRIPTION OF THE PSYCHROMETRIC CHART The ASHRAE Psychrometric Chart is a graphical represen-tation of the thermodynamic properties of air. PSYCBROMETRIC CHART The psychrometric chart is a device which simplifies the measurement of air properties and eliminates many time-consuming 2021 Psychrometric Chart - Fillable, Printable PDF & Forms | Handypdf. 5°C for comfort) DBT ( C)o 5 10 15 20 25 30 30 25 20 15 10 5 35 40 45 50 70 65 75 80 85 AH HOT AND HUMID HOT AND DRY DRY COMFORT ZONE 60 55 50 45 35 40 COLD AND DRY COLD AND HUMID 100 % Image by MIT OCW. kathabar@alfalaval. 1 normal temperature barometric pressure: 29. 20. 4399930 F 0. 0 Psychrometric Chart HVAC Psychrometrics. Step 2. In broader terms it is the science and practices associated with atmospheric air mixtures, their control, and the effect on materials and human comfort. 7 psi) and temperatures of 30° to 120°F, which is adequate for most greenhouse or livestock housing applications. Sample Psychrometric Chart Template. 3. 01% by volume. PSYCBROMETRIC CHART The psychrometric chart is a device which simplifies the measurement of air properties and eliminates many time-consuming Aug 25, 2021 · Carrier Psychrometric Chart. 00 0. Chart by: HANDS DOWN SOFTWARE, www. May 17, 2020 · F18 Carrier Landing Simulation. Standard Psychrometric Chart. Psychrometric software • ASHRAE Psychrometric Analysis CD-ROM (2012, 2007, 2002) [AV 697 P97] Psychrometric Chart: Plotting a psychrometric chart Psychometry is relevant to a very large lot of scientific & engineering self-controls and commercial applications. Explain Psychrometric Definitions 2. Title: MiniPAC Manual REV 4. Assuming a pressure of 14. Simplified psychrometric chart for temperatures and relative humidities. 03%, Oxygen 20. 80 0. 1. 20 0. Unfortunately, many texts and programs of instruction introduce the science of Psychrometrics by explaining the Psych Chart!” May 02, 2020 · 1. psychrometric chart normal temperature i-p units sea level-10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 dry bulb temperature - °f 0 5 10 15 20 25 30 35 40 45 45 50 50 enthalpy - btu per pound of dry air 0 5 10 15 20 25 30 35 40 enthalpy - btu per pound of dry air. At first glance, even a simple psychrometric chart appears complex (Figure 1). 90 0. 0 6. easier a chart has been ME 201 Thermodynamics Psychrometric Chart PSYCHROMETRIC CHART LOW TEMPERATURE www. 30 40 50 60 70 80 90 100 110 115 DRY BULB TEMPERATURE - °F 10 15 20 25 30 35 40 45 50 55 E N T H A L P Y-B t u p e r l b. 55 0. 2. 45 0. The saturation line that de- known. , (a) as the outside and return air mixes, PSYCHROMETRIC CHART FOR HVAC ANALYSIS Air–Conditioning Formulas and Conversion Factors Atmospheric pressure = 29. Display a fully psychrometrlc psychrometric chart in both landscape and portrait modes. 6 Heat content or enthalpy Example: Solution: 6 GRAPSI_DRAW Digital Psychrometric Chart 523 Where: PVS is the saturation pressure (kPa), T is the temperature (K) and the values of F vary as: F 29. pdf - Free download as PDF File (. This tutorial is written in Flash and various audio-visual techniques are incorporated to create an PSYCHROMETRIC CHART 5,000 Feet Barometric Pressure: 24. The first is an example of sensible mechanical cooling and the second is an example of sensible and latent mechanical cooling. There are five different psychrometric charts available and in use today: Chart No. Properties shown on most psychrometric charts are dry- bulb, wet-bulb, and dew point temperatures; relative humidity; humidity ratio; en- thalpy; and specific volume. This chart is commonly used to graph the thermodynamic properties of air at different stages of conditioning processes. com) is a set of software tools dedicated to the learning and better understanding of applied thermodynamics. Scribd is the world's largest social reading and publishing site. 30 0. It is comprised of easy to use interactive charts: ideal gases, Psychrometric Chart. 0 14. A gauge reading of 0 psig does of this work is the construction of a psychrometric chart for humid air at one atmosphere. 414 Btu/hr 1 horsepower = 2545. 70 0. Carrier Psychrometric Chart High Temperatures Metric Units Barometric Pressure 101 325 Kpa Sea Level 400 380 390 370 Pdf Doent. 5. 3 VAPOR PRESSURE - INCHES OF MERCURY-20 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 DEW POINT - °F Using the Psychrometric Chart Problem Statement The air in a oroom has a dry‐bulb temperature of 80 F and a wet‐bulb otemperature of 65 F. The dew point temperature. 30. Create psychrometric processes by plotting points then connecting them with process lines. 0 9. 5 g (water)/kg (dry air). This guide is an easy 8 step framework designed to demystify the psychrometric chart: Step 1. thermoptim. The Ideal Gas Laws are used to determine psychrometric data for air so that the engineer can carry out calculations. 05. The Psychrometric Chart – an Overview Before we proceed further in our study, let’s learn or refresh regarding the Psychrometric chart. It is primarily the research of the various physical properties of moist air and the partnerships when comparing those properties. After locating the point of quality, many other properties can be easily obtained from the chart. The psychrometric charts are con-structed with temperature plotted on the x-axis and absolute humidity on the orthogonal y-axis. 0 5. Air Temperature Psychrometric Chart. Find: The following psychrometric properties of the mixture using the Psychrometric Chart (a) relative humidity (b) humidity ratio (c) specific enthalpy (d) specific volume (e) dew point temperature T I h# Z T dp T wb v The Psychrometric Chart . However, separating the various lines and scales on the chart simplifies understanding of their location, meaning, and use. Values used on the chart are referenced to the heat content of liquid water at 32°F and dry air at 0°F. By applying the sort buttons you’re telling Excel that you’re OK with the psychrometric chart is essential for an understanding of the processes involved in seed drying and in analyzing individual re­ quirements for controlled temperature and humidity seed storage. 921 Inches of Mercury (101. 50. Excel will set a chart on your present worksheet you’re on. 1 1. 95 0. Basic Psychrometric Chart. Now, imagine a vertical line descending from the point to the dry-bulb temperature x-axis. 3 VAPOR PRESSURE - INCHES OF MERCURY-20 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 DEW POINT - °F psychrometric charts Humidity Ratio • Humidity ratio, also known as moisture content, mixing ratio, or specific humidity, is the proportion of mass of water vapor per unit mass of dry air at the given conditions. Explain how Psychrometric calculations used define coil conditions 6. 6 + 0. During this session, the psychrometric chart and its use in solving many air conditioning problems will be explained. pdf. Title: Psychrometric Chart. Putnam Subject: NASA TN-D-8401 ashrae psychrometric chart no. Locate state point on the psychrometric chart at the intersection of 40°C dry-bulb temperature and 20°C thermodynamic wet-bulb temperature lines. 26. 2 — Low temperatures, –40 to 50F Psychrometric chart • plot of several properties of a gas-vapor mixture – Air – Water system at 1 atm : Figure 8. The dry‐bulb temperature is the temperature 11/22/2014 - Birla Institute of Technology and Science, CHART. Open navigation menu The Psychrometric Chart tutorial is a downloadable animated tutorial application which explains the various features of the Psychrometric Chart and how it illustrates indoor or outdoor air conditions and their relation to human thermal comfort. 60. Locate the dry bulb tem - perature along the bottom axis and the associated vertical line for each temperature. indd 947 11/22/13 6:53 PM Confirming Pages. 60 0. 6 Heat content or enthalpy Example: Solution: 6 PSYCHROMETRIC CHART - US and SI Units SEA LEVEL Barometric Pressure: 29. com +1-716-875-2000 Complete humidity control (lb Water /Hr) GPM BTU-In. Understand the importance of apparatus dew point to maintain room RH % 7. Figure 1. Pressure measurements are referenced to atmospheric pressure. ment HVACR Industry psychrometric chart normal temperature si units sea level-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 dry bulb temperature - °c-30-20-10 0 10 20 30 40 50 60 70 80 90 100 110 120 enthalpy - kj per kilogram of dry air-30-20-10 0 10 20 30 40 50 60 70 80 90 enthalpy - kj per kilogram of dry air saturation temperature - °c 1. 15. The Psychrometric Chart Properties of Air At first glance, the psychrometric chart appears to be an imposing network of lines. Psychrometric is the study of air and water vapor mixtures. The psychrometric chart shows selected psychrometric properties as a function of each other. 40. 921" Hg. 7. Psychrometrics Made Simple. Best Psychrometric Chart. •These charts use an oblique enthalpy grid or scale as one plotting coordinate with horizontal humidity ratio as the other plotting coordinate •These charts are not drawn on psychrometric chart through the body of the chart because enthalpy isolines are nearly parallel to wet-bulb temperature isolines 13 HDPsyChart - Psychrometric Analysis Professional Edition User Manual Page 6 Complete Chart control including virtually any Altitude or Pressure, Dry-Bulb and Humidity Ratio Axis Limit Control, turning Lines ON & OFF, Process line color and width, state point icon and size, state point label font control, Comfort Zones, Page Setup and more!! 4. Converting EXE files to The user is first presented with printable spelling words contract forms File Format: Would a column explaining a drying cycle on a psychrometric chart be of interest, printable sign language Click here for printable Psychrometric Chart Please provide the project name. easier a chart has been Figure A–31E Psychrometric chart at 1 atm total pressure 987 APPENDIX2 cen98179_ch19-ap02_947-987. 05218684 Psychrometric charts do not use enthalpy values referenced to absolute zero (–460°F). 65. 0 11. 25 0. Mollier chart style. Create an unlimited number of psychrometric chart . Dry air composition The composition of dry air is given on a mole fraction basis. Putnam Subject: NASA TN-D-8401 Dec 06, 2018 · psychrometric chart english units pdf. Air Temperature Psychrometric charts are available in various pressure and temperature ranges. 896 Inches of Mercury 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 DRY BULB TEMPERATURE - °F psychrometric charts for HVAC design. 9 1 1. Since the psychrometric chart is constructed at constant atmospheric pressure, any two independent variables in the psychrometric chart can help one in locating other properties too. The chart shows all of the following properties: dry bulb temperature, wet bulb temperature, relative humidity, dew point temperature, humidity from the second edition and PDF files of 13 ultra-high-pressure and 12 existingASHRAE psychrometric charts, plus 3 new 0°C to 400°C, 0–1. Title: Psychrometric is the study of air and water vapor mixtures. 6 Btu/hr Psychrometric Chart. Figure 9. Nitrogen 78. When properly used, however, it provides valuable information about the properties of air. 4. Owen Parish and Terrill W. 5. 01 is a typical psychrometric chart. At first glance, even a simple psychrometric chart appears . 45. com 1. 31 x Tmonth (±2. Air is amixture of five main gases. 4-1 • DOF – F = C – P + 2 = 2 –1 + 2 = 3 – P : 1 atm for pychrometric chart – Other 2 varibles : •T db and T wb • T db or hor h r, …. 35. 0 13. This is because each point of the psy-chrometric chart uses the exact variables associated with that point. The basicproperties shownareDBT,WBT, moisturecontent, RH a psychrometric chart for a system may be calculated using the Virial Equation and the enhancement factor to account for the non-idealities in the system. Humid air can be modeled as a pseudo-binary mix-ture formed of water vapor and a xed-composition dry Preprint submitted to Elsevier September 8, 2017 The calculation with the graphically derived ∆h from the psychrometric chart is more exact than the method of calculation using approximate temperature-dependent values. 1 Saturation Line All the points on the saturated line correspond to a Relative Humidity of 100%. • For a given dry-bulb temperature, there will be a particular humidity ratio for which the air sample is at 100% relative humidity. Aug 25, 2021 · Carrier Psychrometric Chart. com. 0 7. 2. Title: Equations for the Determination of Humidity From Dewpoint and Psychromet ric Data Author: O. 70 PSYCHROMETRIC CHART NORMAL TEMPERATURES SI METRIC UNITS Barometric Pressure 101,325 kPa SEA LEVEL 4 0 4 5 a 5 0 a t s a tu 5 5 o 4 k 6 0 g d y 6 5 5 0 % 7 0 t 7 5 i d t y 8 0 8 5 9 0 9 5 % 1 0 0 1 0 5 1 1 0 35 1 1 5 E th lp y ra ti o n J /k g D ry A ir Volume m 3 /kg dry air Dry Bulb Temperature °C Below 0°C, Properties and Enthalpy Deviation “The Psychrometric Chart, however, is not where one begins; it is where one arrives after he has developed an in-depth understanding of the Thermodynamic relationships of the mixtures. 1. 25. 0 4. Title: ASHRAE Psychrometric Chart #1 (SI) Created Date: 9/29/2011 3:30:29 PM a psychrometric process that involves the increase or decrease in the temperature of air without changing its humidity ratio Example: passing moist air over a room space heater and of kiln air over the heating coils PSYCHROMETRIC CHART BAROMETRIC PRESSURE 29. Understand the basic Psychrometric processes & the Chart 4. Air Temperature. 94%, Carbon Dioxide 0. kathabar. 70 The Psychrometric Chart So what is a psychrometric chart and why would anyone want to use it? The psychrometric chart is a convenient and useful tool for (1) determining moist air psychrometric properties, and (2) visual-izing the changes of properties in a se-quence of psychrometric processes; e. 1 The method of PSYCHROMETRIC CHART LOW TEMPERATURE www. In majority of situations, dbt and wbt of the air are measured to find the location of the point on Dec 19, 2017 · Psychrometric Charts In Color An Example Of Active Learning For Chemical Engineering Students And Faculty Members Sciencedirect. The enthalpy can be found by using two triangles to draw a line parallel to the nearest enthalpy psychrometric chart normal temperature i-p units sea level-10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 dry bulb temperature - °f 0 5 10 15 20 25 30 35 40 45 45 50 50 enthalpy - btu per pound of dry air 0 5 10 15 20 25 30 35 40 enthalpy - btu per pound of dry air. All cooling calculation will assume the same design conditions of 90°F Dry Bulb, 75°F Wet Bulb, and 2000 cfm of outside air. Psychrometric chart barometric pressure 29 921 inches of mercury how to read a Title: Equations for the Determination of Humidity From Dewpoint and Psychromet ric Data Author: O. Excel makes it basic to bring a trendline to charted information. , (a) as the outside and return air mixes, PSYCHROMETRIC CHART NORMAL TEMPERATURES SI METRIC UNITS Barometric Pressure 101,325 kPa SEA LEVEL 4 0 4 5 a 5 0 a t s a tu 5 5 o 4 k 6 0 g d y 6 5 5 0 % 7 0 t 7 5 i d t y 8 0 8 5 9 0 9 5 % 1 0 0 1 0 5 1 1 0 35 1 1 5 E th lp y ra ti o n J /k g D ry A ir Volume m 3 /kg dry air Dry Bulb Temperature °C Below 0°C, Properties and Enthalpy Deviation PSYCHROMETRIC CHART FOR HVAC ANALYSIS Air–Conditioning Formulas and Conversion Factors Atmospheric pressure = 29. 3. Create an unlimited number of psychrometric chart projects. It basically creates a chart from the data chosen and the chart will be put on top of the information. Psychrometric Chart Department of Mechanical Engineering National Institute of Technology Jamshedpur Jharkhand 831014 India Psychrometric chartis aconcisechartwhich can be readily looked up for relevant information suchas all the properties discussedpreviously in this slide. 55. “The Psychrometric Chart, however, is not where one begins; it is where one arrives after he has developed an in-depth understanding of the Thermodynamic relationships of the mixtures. 8685635 F 0. 65 0. Discuss air mixing principle and calculations 5. pdf), Text File (. 6 Btu/hr May 02, 2020 · 1. • How to read psychrometric chart ? PSYCHROMETRIC CHART BAROMETRIC PRESSURE 29. o PSYCHROMETRIC CHART Low Temperature I-P Units SEA LEVEL. txt) or view presentation slides online. SET isotherms on psychrometric chart neutral temperature Tn =17. 0 psychrometric chart. Find: The following psychrometric properties of the mixture using the Psychrometric Chart (a) relative humidity (b) humidity ratio (c) specific enthalpy (d) specific volume (e) dew point temperature T I h# Z T dp T wb v THERMOPTIM psychrometric charts - User's Manual October 2011 Psychrometric chart user's manual Overall presentation The THERMOPTIM ® series (www. Air 2. It is necessary to know to parameters to locate the quality of air on psychrometric chart. 0 10. pdf Author: sschanken Created Date: 10/16/2014 9:37:12 AM psychrometric chart normal temperature si units sea level-25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 dry bulb temperature - °c-20-10 0 10 20 30 40 50 60 70 80 90 100 enthalpy - kj per kilogram of dry air-20-10 0 10 20 30 40 50 60 70 enthalpy - kj per kilogram of dry air 1. 2 1. 948 Chart by: HANDS DOWN SOFTWARE, www. linric. This method is similar to that used on pressure gauges. Also, create custom labels anywhere on the chart. 921 inches of mercury copyright 1992 The Psychrometric Chart . 896 Inches of Mercury 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 DRY BULB TEMPERATURE - °F from the second edition and PDF files of 13 ultra-high-pressure and 12 existingASHRAE psychrometric charts, plus 3 new 0°C to 400°C, 0–1. 75 0. The chart shows all of the following properties: dry bulb temperature, wet bulb temperature, relative humidity, dew point temperature, humidity The Psychrometric Chart tutorial is a downloadable animated tutorial application which explains the various features of the Psychrometric Chart and how it illustrates indoor or outdoor air conditions and their relation to human thermal comfort. The basicproperties shownareDBT,WBT, moisturecontent, RH 2021 Psychrometric Chart - Fillable, Printable PDF & Forms | Handypdf. 0 8. Read humidity ratio W = 6. Constant Drybulb Temperature: Vertical Lines The calculation with the graphically derived ∆h from the psychrometric chart is more exact than the method of calculation using approximate temperature-dependent values. Figure 1, on the next page, is for standard atmospheric pressure (14. 40 SENSIBLE HEAT RATIO = Qs / Qt SENSIBLE HEAT RATIO = Qs / Qt 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 15% 25% 2% 4% 6% 8% RELATIVE HUMIDITY 10% RELATIVE HUMIDITY 20% 30% 40% 50% 60% 70% A psychrometric chart is an attempt to show the relationships in many of the properties of moist air. The specific humidity. 05218684 psychrometric chart normal temperature si units sea level 0 5 10 15 20 25 30 35 40 45 dry bulb temperature - °c 0 10 20 30 40 50 60 70 80 90 100 110 110 120 120 enthalpy - kj per kilogram of dry air 10 20 30 40 50 60 70 80 90 100 enthalpy - kj per kilogram of dry air 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 humidity ratio (or specific Psychrometric Chart Two examples of cooling will be reviewed in the following examples. 0 2. Standard Psychrometric Chart free download and preview, download free printable template samples in PDF, Word and Excel formats psychrometric chart normal temperature si units sea level 0 5 10 15 20 25 30 35 40 45 dry bulb temperature - °c 0 10 20 30 40 50 60 70 80 90 100 110 110 120 120 enthalpy - kj per kilogram of dry air 10 20 30 40 50 60 70 80 90 100 enthalpy - kj per kilogram of dry air 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 humidity ratio (or specific Psychrometric Chart Two examples of cooling will be reviewed in the following examples. 1 — Normal temperatures, 32 to 100F Chart No. Title: 94 Lecture psychrometrics Author: r Created Date: 5/28/2013 8:03:01 PM Feb 09, 2016 · · The Psychrometric Chart •Psychrometric properties: •Dry‐bulb temperature (Tdb). The humidity ratio of this point is approximately. 85 0. 6. com sales. Psychrometric properties also are available as data tables, equations, and slide the psychrometric chart is essential for an understanding of the processes involved in seed drying and in analyzing individual re­ quirements for controlled temperature and humidity seed storage. 8. g. This scale will be in degrees F or degrees C. Locate the ‘humidity ratio’ along the right vertical axis GRAPSI_DRAW Digital Psychrometric Chart 523 Where: PVS is the saturation pressure (kPa), T is the temperature (K) and the values of F vary as: F 29. This tutorial is written in Flash and various audio-visual techniques are incorporated to create an Psychrometric Chart HVAC Psychrometrics. 0 15. at sea level 1 BTU = Amount of heat required to raise (or lower) the temperature of one pound of water 1°F 1 ton of refrigeration = 12,000 Btu/hr = 200 Btu/min 1 watt = 3. Do not continue to the next section until you can find the following on the chart. Title: 94 Lecture psychrometrics Author: r Created Date: 5/28/2013 8:03:01 PM Psychrometric Bins The psychrometric chart is a graphical representation of the thermodynamic properties of moist air. 03%, and Hydrogen 0. 7 psia, use the ppysychrometricchart to determine: 1. This is the basic principle adopted in the current study. However, separating the various lines and scales on the chart simplifies understanding their location, meaning and use. Air temperature is a measure of the heat content of air. 35 0. Open navigation menu The actual psychrometric chart is depicted in Fig. 0 16 Psychrometric Properties using the Chart 7 Given: Moist air mixture in our classroom; T, T wb measured with a sling psychrometer. -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 dry bulb temperature - °c 5 10 15 20 25 30 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 110 Title: ASHRAE Psychrometric Chart #1 (I-P) Created Date: 9/29/2011 3:59:03 PM psychrometric chart. 3 July 25 2012. 6. 0 12. 04 kPa) Summer Comfort Winter Zone Comfort Zone. 0 PSYCHROMETRIC CHART 5,000 Feet Barometric Pressure: 24. 921 inches of Mercury Linric Company Psychrometric Chart, www. 99%, Argon 0. handsdownsoftware.