Example engineering calculations
Worked, unit-aware calculation worksheets across structural, mechanical, electrical and more. Open any example into your own workspace to edit and reuse. New to Calculeaf? Start with your first worksheet or the examples guide.
59 examples found
Specific Heat from Test Data
Specific heat capacity of a material from measured heat, mass and temperature rise.
Refrigeration Cooling Capacity
Cooling capacity of a refrigeration cycle from refrigerant flow and enthalpy change.
Air Mass Flow Rate
Mass flow of air in a duct from its density and volumetric flow.
Fan Power
Shaft power of a fan from the pressure rise, flow and efficiency.
Duct Air Velocity
Air velocity in a duct from the volume flow and duct area.
Sensible Cooling Load
Sensible cooling load on an air stream from its mass flow and temperature drop.
Adiabatic Mixing of Two Air Streams
Temperature of two mixed air streams from a mass-weighted average.
Heat Exchanger Effectiveness
Effectiveness of a heat exchanger from the hot-stream temperatures.
Steam Mass from Heat Duty
Steam mass required to deliver a heat duty via its latent heat.
Thermal Diffusivity
Thermal diffusivity of a material from its conductivity, density and specific heat.
Volumetric Thermal Expansion
Change in volume of a liquid or solid from a temperature change.
Power Plant Heat Rate
Heat rate of a power plant — fuel energy per unit of electricity generated.
Boiler Efficiency
Boiler efficiency from useful heat output and fuel energy input.
Net Radiation Between Surfaces
Net radiative heat exchange between a hot surface and cooler surroundings.
Otto Cycle Efficiency
Ideal thermal efficiency of the Otto (petrol-engine) cycle.
Rankine Cycle Thermal Efficiency (Simplified)
A first-law estimate of Rankine (steam power) cycle efficiency directly from the heat added and heat rejected per unit mass of working fluid.
Brayton Cycle Thermal Efficiency
The ideal thermal efficiency of a gas turbine (Brayton) cycle from its pressure ratio and the working gas's specific heat ratio.
Vapor-Compression Refrigeration COP
The coefficient of performance of a vapor-compression refrigeration or air-conditioning cycle, the ratio of cooling delivered to compressor work spent.
Diesel Cycle Thermal Efficiency
The ideal air-standard thermal efficiency of a Diesel cycle, accounting for its constant-pressure combustion phase via the cutoff ratio.
Combined-Cycle Plant Overall Efficiency
The overall thermal efficiency of a combined-cycle power plant that recovers gas turbine exhaust heat in a bottoming steam cycle.
Isentropic Compressor Specific Work
The ideal (isentropic) specific work required to compress a gas across a given pressure ratio, from its inlet temperature and specific heat.
Isentropic Turbine Specific Work
The ideal (isentropic) specific work extracted by a turbine expanding hot gas across a given pressure ratio.
Feedwater Heater Temperature Rise
The temperature rise of boiler feedwater as it absorbs a known heat duty, and the resulting outlet temperature.
Combined Heat & Power (CHP) Overall Efficiency
The overall fuel-utilization efficiency of a combined heat and power plant, crediting both electricity generated and useful heat recovered.