Boiling & Condensation Calculator

• •Use the Boiling & Condensation Calculator when solving homework or exam problems that require quick numerical verification of your hand calculations — instant feedback helps identify arithmetic errors before they propagate.
• •Use it during the early design phase to rapidly iterate on parameters and narrow down feasible configurations before committing time to detailed finite element simulations or full design packages.
• •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility — a quick sanity check can prevent costly downstream errors.
• •Use it to generate reference data for a technical report or presentation without manual computation, ensuring consistent, reproducible numbers throughout the document.
• •Use it in the field when a quick estimate is needed and a full engineering software package is not available.

The Boiling & Condensation Calculator is a precision engineering calculation tool designed for students, engineers, and technical professionals. Rohsenow nucleate pool boiling, film boiling, and Nusselt film condensation on a vertical plate: heat flux q" and heat transfer coefficient h All calculations are performed using established engineering formulas from the relevant scientific literature and standards. Inputs support both metric (SI) and imperial unit systems, with unit conversion handled automatically — simply select your preferred unit from the dropdown next to each field. Results are computed instantly in the browser without sending data to a server, ensuring both speed and privacy. This calculator is intended as a supplementary tool for learning and design exploration; always verify results against authoritative references for safety-critical applications.

Boiling and condensation are two-phase heat transfer processes that involve a phase change at or near a surface. Boiling heat transfer coefficients are much higher than single-phase convection because of intense fluid motion from bubble formation and detachment. Nucleate boiling, the efficient regime with isolated bubbles forming at the surface, produces heat transfer coefficients of 10,000-100,000 W/(m²·K) for water. Beyond the critical heat flux (CHF), the surface becomes covered by a vapor film (film boiling) with dramatically reduced heat transfer — this is the 'boiling crisis' that limits heat flux in pool boiling. Film condensation on vertical surfaces produces a liquid film that flows down under gravity, with Nusselt's classical analysis giving the heat transfer coefficient based on gravity, latent heat, thermal conductivity, and viscosity of the condensate. Condensation coefficients are typically 5,000-25,000 W/(m²·K) — lower than boiling but still much higher than gas-phase convection. These processes are central to steam power plants (condensers), refrigeration (evaporators and condensers), and process heat transfer equipment.

• •Steam power plant condenser design: film condensation heat transfer coefficients determine required surface area for a given condensing duty.
• •Refrigeration evaporator design: nucleate boiling in refrigerant evaporators achieves high heat transfer rates in compact equipment.
• •Heat pipe and thermosiphon analysis: two-phase heat transfer devices rely on evaporation-condensation cycles for heat transport.
• •Nuclear reactor cooling: pressurized water reactors must operate below critical heat flux to avoid boiling crisis that could damage fuel rods.
• •Process cooling and heating: industrial condensers, reboilers, and evaporators size based on boiling and condensation heat transfer predictions.