Psych-v10 5023d

Get Psyched™ Psychrometric Worksheet ver 2.0

focus on energy This sheet will allow you to do psychrometric calculations in Excel and plot your results on a psych chart. The spreadsheet formulas are based on ASHRAE correlations and are accurate to more decimal places than you can read off a psych chart. Overview The Get Psyched™ software includes two basic parts: 1) The Add-In (PSYCH.XLA) The add-in allows you to do psychrometric calculations in any Excel spreadsheet. After you have installed the add-in you can use psychrometric functions in calculations just like you use other functions in Excel. For more information on how to use the functions, see the help file. 2) The Spreadsheet Template (PSYCH.XLT & PSYCH_SI.XLT) The spreadsheet template (this file) uses the add-in functions to create a psychrometric chart. The chart can be easily customized for any altitude. The template also includes some example calculations and an easy method for adding your own data to the psych chart. You can use the spreadsheet template as a starting point for your own spreadsheets. For more information on how to use the template, see the help file. The template is available in IP units (PSYCH.XLT) and metric (SI) units (PSYCH_SI.XLT).

These are the properties that you can calculate with the Psychrometric Function Library: Enthalpy [Btu/lb] Dewpoint Temperature [F] Relative Humidity [%] Humidity Ratio [lbs H2O per lb dry air or grains] Specific Volume [ft^3 per lb] Wet Bulb Temperature [F]

COPYRIGHT NOTICE Copyright 2002 kW Engineering. All Rights Reserved. OF USE This spreadsheet and the accompanying psychrometric function library are provided as shareware for a trial use period of 60 days. After the trial period has expired, you will need to obtain a licensed version. See our website at www.kw-engineering.com to obtain a licensed version. using this spreadsheet you agree to indemnify kW Engineering from any liability that might arise from its (C)ByCopyright 1998. All rights reserved by KW Energy Engineering. use.

Selling the code for this spreadsheet without prior written consent is expressly forbidden.

COPYRIGHT NOTICE Copyright 2002 kW Engineering. All Rights Reserved. OF USE This spreadsheet and the accompanying psychrometric function library are provided as shareware for a trial use period of 60 days. After the trial period has expired, you will need to obtain a licensed version. See our website at www.kw-engineering.com to obtain a licensed version. By using this spreadsheet you agree to indemnify kW Engineering from any liability that might arise from its use. Selling the code for this spreadsheet without prior written consent is expressly forbidden. Obtain written permission from kW Engineering before redistributing this software over the internet or in any other medium.

SOFTWARE LICENSE AGREEMENT This is an agreement between you, the end , and kW Engineering ("KW"). By using this software, you are agreeing to become bound by the of this agreement. IF YOU DO NOT AGREE TO THE OF THIS AGREEMENT, DO NOT USE THIS SOFTWARE. PROMPTLY RETURN THE ENTIRE PACKAGE TO THE PLACE WHERE YOU OBTAINED IT. 1. GRANT OF LICENSE. KW, as Licensor, grants to you, the Licensee, a non-exclusive right to use this software program (hereinafter the "Software") in accordance with the contained in this license. You may use the Software on a single computer free of charge for a period of 60 days from the date you install it. If you wish to use the Software on more than one computer, you must either erase the software from the first computer when you move the Software to another computer, or else purchase two copies of the Software. You may execute the Software from a common disk shared by multiple computers provided that one authorized copy of the Software has been licensed for each computer executing the Software. 2. OWNERSHIP OF SOFTWARE. KW retains the copyright, title and ownership of the Software and the written materials regardless of the form of media in or on which the original and other copies may exist. You may make one (1) copy of the Software solely for backup purposes. You must reproduce and include the copyright notice on the backup copy. 3. TRANSFERS. You may physically transfer the Software from one of your computers to another provided that the Software is used on only one computer at a time. You may not distribute copies of the Software or accompanying written materials to others. You may not transfer the Software to anyone without the prior written consent of KW Engineering. In no event may you transfer, assign, rent, lease, sell or otherwise dispose of the Software on a temporary basis. 4. U.S. GOVERNMENT RESTRICTED RIGHTS. The Software and any accompanying materials are provided with Restricted Rights. Use, duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of The Rights in Technical Data and Computer Software clause at DFARS 252.2277013, or subparagraphs (c)(1) and (2) of the Commercial Computer Software - Restricted Rights at 48 CFR 52.227-19, as applicable. Contractor/manufacturer is KW Engineering, 175 Filbert Street, Suite 205, Oakland, CA 94607-2541. 5. LIMITED WARRANTY. KW warrants that the Software will perform substantially in accordance with the Documentation for a period of 90 days after the Licensee receives the Software. This Limited Warranty is void if failure of the Software has resulted from accident, abuse or misapplication. Except as set forth in the immediately preceding paragraph, KW provides the software and the documentation without warranty of any kind, either express or implied, including, but not limited to, any implied warranties of merchantability or fitness for a particular purpose or warranties of quality or performance. Your exclusive remedy with respect to the Software, the Documentation and this License will be limited to, at KW's option, 1) the replacement of any Software or Document, or 2) a refund of the original purchase price paid for the Software. IN NO EVENT WILL KW OR ITS EMPLOYEES, AGENTS OR SUPPLIERS BE LIABLE FOR ANY DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE OR DOCUMENTATION, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES FOR LOST PROFITS OR ANTICIPATED BENEFITS, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Should any other warranties be found to exist, such warranties shall be limited in duration to ninety (90) days following the date of delivery to the Licensee. In no event will KW's liability for any damages to you or any other person exceed the amount paid for the license to use the Software. 6. This License shall be governed and construed in accordance with the laws of the Sate of California and shall benefit KW Engineering, its successors and assigns.

(C) Copyright 1998. All rights reserved by KW Energy Engineering.

ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE OR DOCUMENTATION, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES FOR LOST PROFITS OR ANTICIPATED BENEFITS, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Should any other warranties be found to exist, such warranties shall be limited in duration to ninety (90) days following the date of delivery to the Licensee. In no event will KW's liability for any damages to you or any other person exceed the amount paid for the license to use the Software. 6. This License shall be governed and construed in accordance with the laws of the Sate of California and shall benefit KW Engineering, its successors and assigns.

(C) Copyright 1998. All rights reserved by KW Energy Engineering.

Sheet Template You can use this sheet as a starting point for your worksheet. It is important that you you do not delete the cell named "Pressure" (in grey). This is a named variable that is used throughout the workbook.You can move it if you like and delete any other elements on the page (including this text box). You can also rename this sheet. There is also a table below that is used to look up the atmospheric pressure based on the altitude. You can delete it if you override the lookup function and enter the pressure yourself.

Altitude 0 ft Atmospheric Pressure Err:511 psi Note that if you change the altitude, the relative humidity labels may need to be repositioned on the graph. You can see correct labels for the lines by holding the pointer over them.

Standard Atmospheric Data for Altitudes to 60,000 ft (from ASHRAE Fundamentals, 1993, p. 6.1 Table 1) Altitude [ft]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

-1000 -500 0 500 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 15000 20000 30000 40000 50000 60000

Pressure [psia]

15.236 14.966 14.696 14.430 14.175 13.664 13.173 12.682 12.230 11.778 11.341 10.914 10.506 10.108 8.296 6.758 4.371 2.731 1.690 1.051

DON'T DELETE THIS SHEET! (you can delete anything except the cell holding the pressure value)

Examples

Examples This sheet shows how to use the psychrometric functions in calculations.

Situation 1. (wet bulb is known) Given: Dry-bulb temperature Wet-bulb temperature Pressure

t wb p

70.0 F 55.0 F Err:511 psia

Find: Relative humidity phi Err:511 Dew-point temperature dp Err:511 Humidity ratio W Err:511 Enthalpy h Err:511 Volume v Err:511

F lbs/lbs Btu/lb cf/lb

Situation 2. (dew point is known) Given: Dry-bulb temperature Dew-point temperature Pressure

t dp p

Find: Wet-bulb temperature Relative humidity Humidity ratio Enthalpy Volume

wb phi W h v

65.0 F 65.0 F Err:511 psia Err:511 Err:511 Err:511 Err:511 Err:511

F lbs/lbs Btu/lb cf/lb

Situation 3. (relative humidity is known) Given: Dry-bulb temperature Relative humidity Pressure Find: Wet-bulb temperature Dew-point temperature Humidity ratio Enthalpy Volume

t phi p wb dp W h v

45.0 F 50.0% Err:511 psia Err:511 Err:511 Err:511 Err:511 Err:511

F F lbs/lbs Btu/lb cf/lb

Page 6

Tip: Use the "Paste Function" button to create formulas using the psych functions. Choose the " Defined" category and then double click on the function that you want to use.

Examples

Paste Function" button ormulas using the psych Choose the " Defined" and then double click on the hat you want to use.

Page 7

Use this page to add a series to plot on the psych chart Altitude Atmospheric Pressure

0 ft Err:511 psi

Situation 1. (wet bulb is known) Given:

1 2 3 4 5 6 7 8 9 10

Dry-bulb Temperature

Wet-bulb Temperature

75 65 70 70

60 60 55 70

Humidity Ratio

Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 #NAME?

Situation 2. (dew point is known) Given:

1 2 3 4 5 6 7 8 9 10

Dry-bulb Temperature

75 60

Dew-point Temperature

Humidity Ratio

50 Err:511 50 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 #NAME?

Situation 3. (relative humidity is known) Given:

1 2 3 4 5 6 7 8 9 10

Dry-bulb Temperature

75 85

Relative Humidity

Humidity Ratio

41.5% Err:511 41.5% Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511 Err:511

Add your values in the green areas. Instructions: Add the points that you want to plot to any of the three tables. Choose which table to use based on the variables that you know. The tables correspond to the three situations listed in the examples. Clear the data in the other tables so that only your data is displayed. You can insert rows as needed if you need to plot more points. Note that you need at least 2 points for the plot to appear on the graph. You can list the same point twice if you only want to show one point.

Hum idity Ratio (lbs H2O pe r lbs dry a ir)

Psychrometric Chart 0.03000 0.02800 0.02600 0.02400 0.02200 0.02000 0.01800 0.01600 0.01400 0.01200 0.01000 0.00800 0.00600 0.00400 0.00200 0.00000 30

35

40

45

50

55

60

65

70

75

80

85

Dry Bulb Temperature (F)

90

95

100

105

110

115

120