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The freeware described here is designed to visualize air-conditioning processes on the Mollier h,x diagram based on a specified air pressure. The program is a service provided by ILK Dresden and is available free of charge for download and  use

Parameters

System Requirements MS Excel with security settings that allow macros to run
Temperature range max. -20°C .. 100°C
Watercontent 0 g/kg .. 50 g/kg
Representable air state points up to 18
Various process flows up to 2
Pressure range freely selectable
Depiction in the fog zone are not possible
Input variables Temperature, enthalpy, relative humidity, water content or atmospheric pressure
License Freeware (including for commercial use)

For this program to function correctly, the execution of macros in MS Excel is required (see the security settings in the Excel menu). Up to 18 process state points can be displayed simultaneously. The calculation of the state variables is performed as a function of pressure.

Process representations are possible within a temperature range of −20 °C to 100 °C and for moisture contents of up to 50 g/kg. The input for each process step can be entered either as an absolute or a relative humidity ratio.

By linking individual state points, simple process calculations can be performed with minimal effort. For each state point, additional informative parameters such as dew point temperature, wet-bulb temperature (adiabatic saturation temperature), enthalpy, and the effective capacity relative to the previous state are displayed in tabular form.

Additional Functions
When the file ILK_hx-Diagramm.xls is opened, an extended set of formulas for calculating the thermodynamic properties of humid air is available in any Excel worksheet under:

Formulas → User Defined

Licensing Conditions

License Terms
Please read these license terms carefully before using the software.

  • This license agreement constitutes a legally binding contract between the user (either as an individual or a legal entity) and ILK Dresden concerning the software product for the representation of processes in the Mollier h,x diagram. By downloading or using this program, you agree to the terms and conditions stated in this license agreement.
  • This program is a FREEWARE product. This means that it may be used free of charge (including commercial use).
  • Paid distribution of the program is not permitted. The software tool may only be made available for download via the ILK Dresden website. However, linking to the download location at
    https://www.ilkdresden.de/hxdia is permitted, provided that no fee or charge is claimed for access.
  • If graphical extracts from this software are used, the source must be cited as: “ILK Dresden hx-Diagramm”
  • It is not permitted to decompile the program or to make any kind of modifications to the software’s object code or to the associated files.
  • This agreement does not grant you any rights with respect to trademarks or service marks of ILK Dresden.

The General Terms and Conditions of ILK Dresden shall apply.

Copyright
All rights and intellectual property rights relating to the software (including, but not limited to, images, calculation equations, texts, and “applets” contained within the program), the accompanying materials, and any copies of the software are the property of ILK Dresden.

Disclaimer of Warranty
THIS SOFTWARE IS PROVIDED WITHOUT WARRANTY OF ANY KIND. YOU USE THIS SOFTWARE AT YOUR OWN RISK. ILK DRESDEN SHALL NOT BE LIABLE FOR ANY LOSSES, ERRONEOUS DATA, OR ANY LOSS OF PROFITS ARISING OUT OF THE USE OF, OR INABILITY TO USE, THIS SOFTWARE, OR FROM ANY IMPROPER USE THEREOF.