P-T Calculator

National Refrigerants

About this app

This comprehensive Pressure/Temperature calculation tool from National Refrigerants provides several unique features designed to make the HVAC/R technician’s job easier. This app is more than a PT chart – it can calculate a simple pressure/temperature relationship or calculate superheat/subcool temperatures. The user can input pressure or temperature(s) on any screen and the other values are automatically calculated and displayed. For refrigerant blends, both saturated vapor and saturated liquid values are displayed. Within the superheat/subcool screen, a graphic display for blends will show the entering, mid-point, and outlet temperature as well as line temperature.

Other features include:
- Automatic altitude correction (if location services are enabled)
- English/Metric units
- Easily choose from “favorites” refrigerants list
- Supplementary information about refrigerants and links to NRI website
- Link to NRI Lubricant Cross Reference app
- Link to NRI Branch Locator tool

Ratings and reviews

I have used National Refrigeration for years and would love to recommend the app to the students at my school ... but frankly it has some issues that I would like to see addressed: a) I cannot open the PDF when I touch the link. This appears to be a glitch. b) Similarly, under the section called 'INFO' none of the links are accessed when I touch them. I tried deleting and reinstalling the app, but no change. c) There is good information provided, but the design is not especially intuitive.

great app. only thing it is missing is Hydrocarbon Refrigerant Pt chart

Perfect exactly what i needed

What's new

Calculation fixes