Question 1

How do I calculate steam enthalpy online?

Accepted Answer

ChemCalc provides IAPWS-IF97 steam tables for regions 1, 2, and 4 with an explicit Region 3 boundary warning. Enter temperature and pressure to get enthalpy, entropy, specific volume, and quality for saturated or superheated steam. No installation required — runs in your browser.

Question 2

What refrigerants are supported for COP calculations?

Accepted Answer

ChemCalc supports 10 refrigerants including R134a, R32, R22, R125, R1234yf, R290 (propane), R717 (ammonia), R410A, R404A, and R600a, using NIST Watson-fit enthalpies for accurate COP and cycle calculations.

Question 3

How do I size a safety valve per API 520?

Accepted Answer

Use the Safety Valve module in ChemCalc. Enter fluid type (gas or liquid), relief pressure, temperature, and flow conditions. The calculator applies API 520 Part I orifice sizing with API 526 letter designations.

Question 4

Can I do VLE flash calculations online?

Accepted Answer

Yes. ChemCalc includes a smart thermo-recommender that auto-routes between Wilson, NRTL, UNIQUAC, UNIFAC, and PR/SRK EOS based on polarity and LLE risk. It covers 454 binary interaction pairs (163 NRTL + 161 Wilson + 130 UNIQUAC) from ChemSep via the thermo MIT library, with 130 components. The AUTO mode picks the best model and shows the reason and accuracy class.

Question 5

Do I need to install ChemCalc?

Accepted Answer

No. ChemCalc runs directly in the browser. You can optionally add it to your home screen as a shortcut, but the calculations do not require a native app or account.