Steam properties
The thing works OK, but a huge shortcoming is that it doesn’t have a saturated steam mode. Without referring to steam tables, you are left to guess and iterate to find the saturation temperature for a given pressure.
USE THIS ONE!
If you're an engineering student, this is the steam app you want. It includes compressed water properties too, which the other apps don't have. Almost all units available including mixing an matching of English and Standard units. Great app, I wish I had this when I took Thermo.
Fast perfekt
Die App ist ein wunderbarer Begleiter im Studium und ersetzt fast eine gedruckte Wasserdampftafel. Man kann jederzeit ohne große Interpolation Werte ablesen und durch die automatische Mitnahme der Werte in die anderen Registerkarten erspart man sich viel Tipparbeit. Solche kleinen Einbauten fehlen leider in vielen Apps und zeigen das sich hier einige Gedanken bei der Programmierung gemacht wurden und nicht einfach ein Programm geschrieben wurde. Eine Kleinigkeit wäre aber noch wünschenswert. Wie in der vorangegangenen Rezension erwähnt, wäre der Einbau einer Registerkarte bei der man durch Eingabe von Druck und Temperatur alle Prozessparamter wie h' , h" sowie s' und s" und weiterer Werte ablesen könnte wünschenswert. In der zur App gehörenden gedruckten Version als Table 1 aufgelistet.
Wenn man zusätzlich die Registerkarte Units dadurch ersetzen könnte, dass die Einheiten durch Klicken auf Selbige geändert werden könnten, wäre die App quasi perfekt.
Trotzdem 5 Punkte
Wenn man zusätzlich die Registerkarte Units dadurch ersetzen könnte, dass die Einheiten durch Klicken auf Selbige geändert werden könnten, wäre die App quasi perfekt.
Trotzdem 5 Punkte
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works great, solid app
this app is one of my most valuable tools. perfect for steam plant work and power systems analysis. quick, easy to use, and beats the HELL out of doing table lookups with interpolations all day.
one suggestion for improvement would be to include "thermodynamics" in the keywords list for AppStore searching. I almost didnt find this app? good thing I stumbled upon it.
one suggestion for improvement would be to include "thermodynamics" in the keywords list for AppStore searching. I almost didnt find this app? good thing I stumbled upon it.
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Nice for the practicing engineer!
Spot-checked against a copy of Keenan & Keyes (1969) with good agreement. I understand that the IAPWS-IF97 formulation gives slightly different results than the classic tables ... As the joke goes, if you're worried about the fourth significant digit, you're already in trouble! Nice and useable, fast results, and handy to have instead of a book taking up space.
Possible suggestions for future versions:
* please clarify I-P units (specify psia, for instance, instead of psi)
* it was not immediately obvious how to get to saturation properties (use the p,x or t,x tabs and set quality to 1 for vapor and 0 for liquid), maybe if there was a quick toggle option that would help
* take better advantage of the real estate on the iPad -- less scrolling or f, fg, and g saturation properties in a three-column table
* provide a way to mix units -- e.g., enter units in I-P and get SI results without having to toggle the entry units as well, but this may add needless complexity
* instead of verbose property descriptions consider the use of standard nomenclature (h instead of enthalpy, s instead of entropy, cp instead of isobaric heat capacity) with a touch to bring up verbose description or an option to switch between the two.
Possible suggestions for future versions:
* please clarify I-P units (specify psia, for instance, instead of psi)
* it was not immediately obvious how to get to saturation properties (use the p,x or t,x tabs and set quality to 1 for vapor and 0 for liquid), maybe if there was a quick toggle option that would help
* take better advantage of the real estate on the iPad -- less scrolling or f, fg, and g saturation properties in a three-column table
* provide a way to mix units -- e.g., enter units in I-P and get SI results without having to toggle the entry units as well, but this may add needless complexity
* instead of verbose property descriptions consider the use of standard nomenclature (h instead of enthalpy, s instead of entropy, cp instead of isobaric heat capacity) with a touch to bring up verbose description or an option to switch between the two.
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