Refrigeration and Air Conditioning Online Calculators and Free Software

Compression Power
Knowing the refrigerants isentropic index, suction pressure, discharge pressure and swept volume one can use this tool to experiment by changing these variables and watching the effects.
Experiment

Condenser Fan Cycling

Head Pressure
Calculate number of fans or fan pairs required for low ambient head pressure control using the fan cycle method.
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Psychrometrics

Air Handling Unit Performance Calculator
Calculate the performance of an air handling unit given that altitude, air volume flow then return and supply air dry and wet bulb temperatures are known.
Calculate!

Relative Humidity (DP and WB to RH)
Calculate relative humidity when altitude, dry bulb and wet bulb temperatures are known.
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Relative Humidity (DB and DP to RH)
Calculate relative humidity when dry bulb and dew point temperatures are known. (At sea level)
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Dew Point (DB and RH to DP)
Calculate dew point temperature from dry bulb temperature and percent relative humidity. (At Sea Level)
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Heat Index
Calculate the apparent or perceived temperature from known dry bulb temperature and relative humidity.
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Atmospheric Pressure and Water
Calculate the boiling point of water at differing atmospheric pressures. This calculator is only good for slight pressure changes due to either altitude or weather.
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Fluid Flow

Round Duct Equivalent Diameter
For any rectangular duct and it's pressure drop, calculate the equivalent round duct diameter with matching pressure drop.
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Tube Pressure Drop
Calculate refrigerant pipe frictional pressure drops.
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Refrigerant Orifice Size
Calculate the required orifice size given mass flow, density and pressures.
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Required Pressure Drop Change
Given any fluid carriage system (air ducts, water pipes etc.) with a known volume flow and pressure drop, for any new volume flow the corresponding new pressure drop required or induced can be calculated.
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New Volume Flow After Modified Pressure Drop
Given any fluid carriage system (air ducts, water pipes etc.) with a known system pressure drop and volume flow, for any new pressure drop the corresponding new volume flow can be calculated.
Calculate!

Log Mean Temperature Difference

LMTD
Given any saturated condition, evaporator or condenser, and return then supply and leaving processed medium temperatures this tool will calculate Log Mean TD.
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LMTD - Non saturated
Given both return and supply temperatures either side of a heat exchanger, this tool will calculate Log Mean TD.
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Heat Flow

Thermal Conductance
Calculate the heat flow through various dimensions of various sample materials at various temperature differences.
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Radiated Heat Emission
Calculate the heat radiated from surface areas of various materials at various temperatures.
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Round Duct Heat Loss
Calculate how much heat is lost through round duct walls.
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Rectangular Duct Heat Loss
Calculate how much heat is lost through rectangular duct walls.
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Chilled Water

Calculate Achieved Duty
With known flow rates and water temperatures this tool calculates achieve duty.
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Calculate Required Flow Rate
With known system chilled water duty and specified water temperatures, this tool calculates required water flow rate.
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Pressure Testing & Vacuum

Nitrogen Pressure Testing
Calculate the expected pressure changes within a pressure tested system due to ambient temperature changes. If your second pressure reading falls somewhere between the original and the new then your system is leak tight.
Calculate!

Boiling Water In A Vacuum
This table charts Mercury(Hg) inches vacuum water boiling points at deferring Fahrenheit temperatures. Especially useful as a guide for the triple vac process where with each vacuum a minimum achieved pressure is required to vapourise water.
Calculate!

Arbitrary Unit Conversions

Units of Length
Convert between the most commonly used units of length.
Convert!

Units of Volume
Convert between the most commonly used units of volume.
Convert!

Units of Weight
Convert between the most commonly used units of weight.
Convert!