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@Air 3.1 is a minor upgrade for @Air 3.0. It
includes a new unit set, METF similar to MET but using kg/cm2 for pressure instead of
bar. In addition, it includes some minor bug fixes and
improvements to the accuracy of the transport property functions for
viscosity and thermal conductivity.
@Air 3.0 has added many new
features over the previous version, @Air 2.0. These include
the following:
 | Extends the temperature range upwards from 200 °C,
(392 °F) to 2000 °K, (3140 °F). |
| Adds transport property functions:
 | AirPTWC, which calculates specific heat given pressure,
temperature and humidity ratio. |
| AirPTWM, which calculates dynamic viscosity given pressure,
temperature and humidity ratio. |
| AirPTWK, which calculates thermal conductivity given pressure,
temperature and humidity ratio. |
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| Includes DeskTop Air, an
advanced air property calculator with many improved features over the
previous air property calculator. |
| Adds four new unit sets, EngG using psig for pressure instead of
psia, SIF, which uses the formal SI units, MPa for pressure instead of
bar and °K for temperature, instead of °C, SIK using kPa instead of
bar for pressure and MET using the calorie instead of the joule for
energy. |
| Allows specific properties to be expressed on either a dry or wet
basis. |
| Allows the humidity ratio parameter to be input alternately, as mole
fraction or mass fraction. |
| Added new thermodynamic functions:
| AirPTHs, which calculates saturated enthalpy given pressure and
temperature. |
| AirPHTs, which calculates saturation temperature for a given
pressure and enthalpy. |
| AirWX, which calculates either the mole or mass fraction given
the humidity ratio. |
| AirXW, which calculates the humidity ratio given either the mole
or mass fraction. |
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| Improved installation program that allows distribution over the web. |
| Seamlessly
extends your spreadsheet program's set of built-in functions. |
| Accurate
properties consistent with ASHRAE tables. |
| Equations
based on virial equation of state using second and third order mixing
coefficients.
No perfect gas assumptions. |
| Accuracy
fully documented. |
| Supports
many combinations of input data. |
| Use
English, English Gage, SI Common, SI Formal, SI kPa and Metric unit
sets. |
| Allows
pressures up to 50 bar
(725 psia) and temperatures from 180 °K (-135.7 °F) to 2000
°K (3140.3 °F). |
| Calculates
specific volume, enthalpy, entropy, specific heat, viscosity or
thermal conductivity. |
| Uses
or calculates humidity ratio, relative humidity, degree of saturation,
wet bulb or dew point temperatures. |
| Express
moisture as humidity ratio, mole fraction or mass fraction. |
| Express
results on wet or dry basis. |
The @Air package includes various add-ins which link
the functions to many popular 32-bit Windows applications. Add-ins
are included for Microsoft Excel Versions for Office 95 and Office 97,
Office 2000 and Office XP, Lotus 1-2-3 97 and 1-2-3 Millennium and
MathSoft Mathcad Plus Versions 6, 7 and 8.
No programming is required to use the @Air functions
with any of these applications. Just follow a few simple steps to load the
add-in, and from then on, the functions will be available every time you
start the application. You use the functions just like any of the built-in
functions. The functions can be used in any spreadsheet formula and any
argument to the functions can be a number, a formula or a cell reference.
All of the steam property functions are contained in a Windows Dynamic
Link Library (DLL). The @Air package includes a 32-bit
version of the DLL, which supports applications designed for Windows 95,
98, NT, 2000 and XP. Function prototypes and LIB files are included in
the package to support Microsoft C/C++ compilers. Declaration files are
included to facilitate programming with Microsoft Visual Basic or
Microsoft Access.
Go Back to Key Features
The following table lists all of the @Air functions
currently available.
| Function(InputArguments) |
Output Value |
| AirPTWV(P,T,W,unit) |
Specific Volume |
| AirPVWT(P,V,W,unit) |
Dry Bulb Temperature |
| AirTVWP(T,V,W,unit) |
Pressure |
| AirPTW(P,T,unit) |
Saturated Humidity Ratio |
| AirPWD(P,W,unit) |
Dew Point Temperature |
| AirPTRW(P,T,RH,unit) |
Moisture |
| AirPTWR(P,T,W,unit) |
Relative Humidity |
| AirPTWB(P,T,W,unit) |
Wet Bulb Temperature |
| AirPTBW(P,T,B,unit) |
Moisture |
| AirPBWT(P,B,W,unit) |
Dry Bulb Temperature |
| AirPBRT(P,B,R,unit) |
Dry Bulb Temperature |
| AirPTWU(P,T,W,unit) |
Degree of Saturation |
| AirPTUW(P,T,U,unit) |
Moisture |
| AirPTWH(P,T,W,unit) |
Specific Enthalpy |
| AirPTHs(P,T,unit) |
Saturated Enthalpy |
| AirPWHT(P,W,H,unit) |
Dry Bulb Temperature |
| AirPHWT(P,H,W,unit) |
Dry Bulb Temperature |
| AirPHTs(P,H,unit) |
Saturated Dry Bulb Temperature |
| AirPTWS(P,T,W,unit) |
Specific Entropy |
| AirPWST(P,W,S,unit) |
Dry Bulb Temperature |
| AirPSWT(P,S,W,units) |
Dry Bulb Temperature |
| AirPTWC(P,T,W,units) |
Specific Heat |
| AirPTWM(P,T,W,units) |
Dynamic Viscosity |
| AirPTWK(P,T,W,units) |
Thermal Conductivity |
| AirVapPT(Pvap,unit) |
Saturation Temperature of Water |
| AirVapTP(T,unit) |
Saturation Pressure of Water |
| AirCondPTH(P,T,unit) |
Enthalpy of Compressed Liquid Water |
| AirCondPTS(P,T,unit) |
Entropy of Compressed Liquid Water |
| AirWX(W) |
Mole or mass fraction |
| AirXW(X) |
Humidity Ratio |
| AirVer() |
Version and serial number |
- Note:
- P = Pressure
- Pvap = water vapor pressure
- T = Dry Bulb Temperature
- V = Specific Volume
- W = Moisture defaults to humidity ratio but can be mole or mass
fraction by adding C or M to unit set.
- RH = Relative Humidity
- B = Wet Bulb Temperature
- H = Enthalpy
- S = Entropy
- C = Specific Heat
- M = Dynamic Viscosity
- K = Thermal Conductivity
- U = Degree of Saturation
- X = Mole or mass fraction
- unit = Unit Set
The unit set argument selects either English, SI or Metric units.
When calling the functions from 1-2-3, the function name is preceeded
by the "@" character, eg. @AirPTWH(P,T,W,unit) for 1-2-3.
If you wish to try @Air, you may download
a fully functioning copy for a 30 day evaluation period. You may
also use this download as a replacement for a lost or damaged copy of @Air
3.0 or 3.1. If you decide to purchase @Air you may use the
download and we will provide you with a serial number for permanent
use. The download version is identical to the hard copy except that
it includes an HTML version of the user's manual (which you can read using
your web browser) instead of a paper copy. Ordering @Air
3.1, via download saves you time and shipping costs.
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