Heat Exchanger Duty Calc

Sizing a heat exchanger or verifying duty on an existing unit? Enter hot and cold side temperatures, flow rate, fluid specific heat, and specific gravity. Get instant LMTD, heat duty in BTU/hr, UA product, and thermal effectiveness for both counter-flow and parallel-flow configurations.

WHAT IT CALCULATES:

- Log Mean Temperature Difference (LMTD)

- Heat duty in BTU per hour

- UA product (overall heat transfer coefficient times area)

- Thermal effectiveness (actual vs maximum possible heat transfer)

FLOW CONFIGURATIONS:

- Counter-flow (hot and cold fluids flow in opposite directions)

- Parallel-flow (hot and cold fluids flow in the same direction)

INPUTS:

- Hot side inlet and outlet temperatures

- Cold side inlet and outlet temperatures

- Flow rate (GPM)

- Fluid specific heat (Cp)

- Fluid specific gravity

KEY FEATURES:

- Counter-flow and parallel-flow support

- Instant results as you adjust inputs

- Clean, field-friendly interface

- Works completely offline

- No account or login required

Built for process engineers, mechanical designers, and plant operators who need quick heat exchanger performance calculations during design, commissioning, or troubleshooting.