This app has the beginnings of a good app. But as is, it is limited in usefulness, and ASHRAE should not be selling this essentially beta version as a serious tool. Specifically the shortcomings are:
1. Needs an undo button.
2. SHR < 10% displays as a vertical line.
3. Needs enthalpy-humidity ratio button like SHR button.
4. Should be able to connect multiple lines to one point to show the correct process direction. For example, mixing point.
5. Need to add the ability to back up files.
6. Should add the ability to lock points so that they are not accidentally moved.
7. Would be nice to be able to delete lines by selecting them rather than going to the point menu to delete it.
8. When editing a point, there are times when the changes are not accepted.
If these changes are implemented, this could be a very useful app. However, as is, I wouldn't recommend purchasing it, and ASHRAE should make clear its limitations to people who are considering buying it. However, it appears that Carmel Software Corporation, who developed the app, is no longer updating it, and they don't respond to customer requests.
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Thzk Ko
Mikerezk
Marty731959