HVAC & Building Services calculators
Cooling loads, U-values, psychrometrics, COP/EER, air and water flow, ducts.
AC Cooling Load EstimatorPreliminary room cooling load from its separate heat gains — sensible and latent — in kW, Btu/h and tons, with a suggested AC size.HVAC & Building ServicesAir Changes per Hour (ACH) CalculatorAir changes per hour from room size and airflow — or the airflow needed for a target ACH.HVAC & Building ServicesAir Sensible & Latent Heat CalculatorSensible, latent and total heat of an air stream — or the airflow or temperature change for a given load.HVAC & Building ServicesChilled & Hot Water Flow Rate CalculatorWater flow rate for a cooling or heating load and ΔT — or the load carried by a known flow.HVAC & Building ServicesCOP, EER & kW/TR ConverterConvert cooling efficiency between COP, EER and kW/TR, or work it out from cooling capacity and electrical input power.HVAC & Building ServicesDuct Size & Air Velocity CalculatorAir velocity in round or rectangular ducts, round duct size for a velocity, and rectangular-to-round equivalent diameter.HVAC & Building ServicesPsychrometric Properties CalculatorHumidity ratio, dew point, wet bulb, enthalpy and specific volume of moist air from dry-bulb temperature and relative humidity.HVAC & Building ServicesU-Value & Heat Loss CalculatorU-value of a wall, roof or floor from its layers, and the heat loss or gain Q = U × A × ΔT.HVAC & Building Services
Also useful
Calculators from other categories that are often needed in this field.
Pipe Flow Rate & Velocity CalculatorFlow rate from average velocity and pipe inside diameter, or velocity from flow rate.Mechanical EngineeringPressure & Hydrostatic Pressure CalculatorPressure from force over an area, or gauge and absolute pressure at a depth in a still liquid.Mechanical EngineeringVolume & Surface Area CalculatorVolume, capacity in litres and surface area of boxes, cylinders, spheres and cones.Units & GeometryElectricity Cost CalculatorEnergy use (kWh) and running cost of any appliance or machine.Electrical Engineering