Find humidity ratio, enthalpy, dew/frost point and moist-air density from temperature, RH and absolute pressure.
Balance two known dry-air mass streams and check that the resulting mixture stays unsaturated.
Estimate temperature-based bypass and contact factors using a known apparatus dew point.
Calculate moisture removal from the drop in humidity ratio across a coil.
Convert a specified sensible heating or cooling duty into airflow using chosen air properties.
Estimate supply and exhaust outlet temperatures and sensible recovery for equal air heat-capacity rates.
Estimate leaving dry-bulb temperature from entering dry/wet bulb and specified saturation effectiveness.
Find net filter face area and the number of equal filter modules needed to stay at or below a chosen face velocity.
Estimate driven fan speed from pulley pitch diameters, motor speed and a specified slip allowance.
Scale a known operating point for a speed change at unchanged impeller geometry and fluid density.
Calculate sensible heat transfer from measured liquid flow and temperature difference.
Estimate hydraulic, shaft and motor electrical input power for a specified pump head and liquid flow.
Estimate available suction head above vapor pressure from a large source vessel.
Estimate a liquid valve flow coefficient for known flow, pressure drop and density.
Compare a fully open valve drop with the total pressure drop of its controlled variable-flow path.
Calculate contained volume and liquid mass from actual internal diameter and total straight length.
Estimate unconstrained axial length change using a supplied thermal-expansion coefficient.
Predict mixed temperature for two liquid-water mass flows with the same specific heat.
Estimate the Joukowsky pressure rise from a velocity reduction and compare closure time with a wave round trip.
Split known total flow between two parallel branches with supplied quadratic resistances.
Estimate steady indoor CO₂ from a specified total generation rate and outdoor airflow.
Estimate exponential dilution time to a user-chosen tracer concentration above supply background.
Combine four representative equal-area mean velocity readings into an estimated airflow.
Convert a local total-minus-static pressure reading to air velocity using measured density and probe coefficient.
Estimate flow through a known opening with a supplied discharge coefficient at a small pressure difference.
Combine three material layers and surface resistances into a plane-wall U-value and heat flow.
Estimate radial heat flow from a known pipe surface through insulation and an outside convection film.
Find LMTD and heat duty from two positive terminal temperature differences and known UA.
Infer sensible heat duty, cold outlet temperature and effectiveness from the hot-side temperature drop.
Calculate net radiation between two large, facing, parallel grey surfaces.
Evaluate convective heat flow and thermal resistance using a supplied film coefficient.
Estimate an object’s transient temperature and check whether internal gradients can be neglected.
Estimate fuel mass from useful boiler duty, operating time and an explicitly LHV-based efficiency.
Calculate controlled blowdown and makeup from evaporation, drift and target cycles of concentration.
Calculate operating heating COP from simultaneously measured heat delivery and total electrical input.
Combine two uncorrelated sound-pressure levels measured at the same receiver.
Estimate sound level at a second distance from the same point source in a free field.
Estimate frequency-specific RT60 and additional equivalent absorption for a target decay time.
Check force transmissibility for a linear single-degree-of-freedom isolator.
Translate a linear 4–20 mA pressure transmitter reading to its configured kPa range.
Estimate capacitive reactive power needed to improve a lagging displacement power factor.
Compare measured rotor speed with synchronous speed for an induction motor.
Calculate the NEMA-style magnitude unbalance from three measured line-to-line RMS voltages.
Estimate transformer efficiency at a selected load using no-load and rated-load loss data.
Make a nominal battery-energy runtime estimate with explicit usable-capacity and inverter-efficiency factors.
Calculate steady mechanical shaft torque from delivered shaft power and measured loaded speed.
Estimate harvestable rainfall volume from projected catchment area and a collection-efficiency factor.
Estimate uniform unpressurized flow capacity at a specified rectangular channel water depth.
Estimate annual energy and tariff cost from operating hours and active/standby electrical power.
Screen an efficiency project using net capital cost and constant net annual savings.