Air Psychrometrics
Air psychrometrics are the study of moist and humid air and the change of air condition - psychrometric charts, Mollier diagrams, air temperature and absolute and relative humidity, moisture content ..
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Absolute Humidity of Air
Humidity or moist is the water vapor present in air. Common used terms are the Absolute, Specific and Relative Humidity.
Air - Altitude, Density and Specific Volume
The density and the specific volume of air varies with the elevation above sea level
Air Composition
Dry air is a mechanical mixture of nitrogen, oxygen, carbon dioxide and more
Air Humidifying with Steam - Imperial Units
The amount of vapor (lb/h in 100 cfm) in humid air
Air Properties
Air properties - temperature, density, specific heat, thermal conductivity, expansion coefficient, kinematic viscosity and Prandtl number for temperatures between -150oC and 400oC.
An Introduction to Psychrometry
An introduction to air psychrometrics
Changing Air Conditions by Heating, Cooling, Mixing, Humidifying or Dehumidifying the Air
Overview of the basic changes of air conditions by heating, cooling, mixing, humidifying and dehumidifying air by adding steam or water. The different processes are shown in psychometric diagram and the Mollier chart.
Common Psychrometric Terms
Common psychometric terms as Dry Bulb and Wet Bulb Temperature, Specific Volume, Relative Humidity and Enthalpy
Comparing the Mollier Diagram and the Psychrometric Chart
How to transform between the psycrometric chart and the Mollier chart.
Cooling and Dehumidifying Air
The cooling and dehumidifying process of moist and humid air. Sensible and Latent Cooling
Cooling Tower Efficiency
The maximum cooling tower efficiency depends on the wet-bulb temperature of the air
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Dehumidfication in Psychrometric Charts
A dehumidification tutorial with psychrometric charts
Dehumidifiers
Classification of dehumidifiers
Density of Dry Air, Water Vapor and Moist Humid Air
Calculating the density of dry air, water vapor or the mixture of air and water vapor - moist or humid air
Dry Bulb, Wet Bulb and Dew Point Temperature
Dry Bulb, Wet Bulb and Dew Point temperatures are commonly used to determine the state of humid moist air.
Drying Force of Air
The Drying Force (or Effect) of air may be expressed as the moisture holding capacity of the air and the evaporation capacity from a water surface to the air
Enthalpy of Moist and Humid Air
The enthalpy of moist and humid air consist of sensible heat and latent heat. The enthalpy is important for calculating cooling and heating processes
Evaporation from Water Surfaces
The amount of evaporated water from a water surface - as a swimming pool or an open tank - depends on the temperature in the water and in the air, and the humidity and velocity of the air above the surface
Evaporative Cooling
An evaporative cooling tutorial
Great Sensible Heat Factor - GSHF
The Great Sensible Heat Factor is the ratio between the sensible and total heat for a cooling coil
Heating Humid Air
Calculating enthalpy change and temperature rise when sensible heating moist and humid air
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Humid Air and the Ideal Gas Law
The Ideal Gas Law relating pressure, temperature, and volume of an ideal or perfect gas can also be used for air with water vapor - moist air
Humidifying Air by Adding Steam or Water
Air can be humidified by adding water or steam
Humidifying Air with Steam - SI units
The amount of vapor - kg per cubic meter - in humid air
Humidity Ratio of Air
Humidity ratio is the ratio between actual mass of water vapor present in moist air - to the mass of dry air
Latent Heat Flow
Latent heat is the heat that when supplied to, or removed from air, there is a change in the moisture content of the air, but the temperature of the air is not changed
Measure Humidity
How to measure relative air humidity with dry and wet bulb temperatures
Mixing Humid Air
Calculating enthalpy, heat, temperature and specific humidity when mixing humid air
Moist Air and Degree of Saturation
The ratio of the humidity ratio of moist air to the humidity ratio of saturated moist air - is called the Degree of Saturation
Moist Air Properties
Psychrometric Table of Moist Humid Air Properties
Mole Fraction of Water Vapor in Moist Air
The mole fraction of water vapor express the ratio of water molecules to air and water molecules.
Molecular Mass of Air
Dry air is a mixture of gases where the molecular weight can be calculated by adding the weight of each component
Online Psychrometric Calculator
An online psychrometric calculator in SI and English Units
Outside to Inside Temperature and Relative Humidity
The relationship outside and inside temperature - and relative humidity
People and Heat Gain
Approximate Heat Gain from Occupants in Air Conditioned Spaces - in btu/hr
Persons and Metabolic Heat Gain
Approximate metabolic heat gain from occupants in air conditioned spaces at different degrees of activities - in watts
Pressure in Moist Air - Daltons Law
The pressure in a mixture of dry air and water vapor - humid or moist air - can be estimated by using Daltons Law
Psychrometric Chart - Barometric Pressure 29.921 inches of Mercury
A psychrometric chart in English units - temperature ranging from 20oF to 120oF
Psychrometric Chart - Resizeable in Word format
A word document with a psychrometric chart that can be resized.
Psychrometric Chart - the Mollier Diagram
The psychrometric chart or the Mollier diagram graphically represents the interrelation of air temperature and moisture content and is a basic design tool for building engineers and designers
Psychrometric Chart at High Temperatures at Sea Level
Psychrometric Chart in I-P Units at high temperature at sea level and barometric pressure 29.921 Inches of HG
Psychrometric Chart at Low Temperatures at Sea Level
Psychrometric chart in I-P Units at low temperature at sea level and barometric pressure 29.921 Inches of HG
Psychrometric Chart at Normal Temperatures at 5000 Feet
Psychrometric chart in I-P Units at 5000 feet and barometric pressure 24.896 Inches of HG
Psychrometric Chart at Normal Temperatures at 7500 Feet Altitude
Psychrometric chart in I-P Units at 7500 feet and barometric pressure 22.653 Inches of HG
Psychrometric Chart at Normal Temperatures at Sea Level
Sea Level Psychrometric Chart - Ledger Size - Both US and SI units
Psychrometric Chart in SI Units for Download
A downloadable psychrometric chart at normal temperatures in SI Units
Psychrometric Chart with an Extended Range
An psychrometric chart with extended range.
Psychrometric Charts - An Introduction
Air conditions can be characterized by using the psychrometric chart. Properties on the chart include dry-bulb and wet-bulb temperatures, relative humidity, humidity ratio, specific volume, dewpoint temperature and enthalpy
Psychrometric Online Calculator
Calculate moist air properties in both SI and Imperial units with this online calculator
Recommended Indoor versus Outdoor Temperature
Recommended indoor effective temperatures for various outside dry-bulb temperatures
Relative Humidity Limits in Production and Process Environments
Recommended Relative Humidity - RH - limits in production and process environments like libraries, breweries, storages and more
Relative Humidity of Air
Relative humidity can be expressed by partial vapor and air pressure, density of the vapor and air, or by the actual mass of the vapor and air
Room Sensible Heat Factor - RSHF
The Room Sensible Heat Factor - RSHF - is defined as the sensible heat load in the room divided by the total heat load in room
Sensible Heat Flow
Sensible heat is dry heat causing change in temperature but not in the moisture content
Sensible Heat Ratio - SHR
Sensible Heat Ratio - SHR - is defined as the sensible heat or cooling load divided by the total heat or cooling load
Specific Heat Capacity of Dry Air
The Specific Heat Capacity of dry air varies with temperature.
Specific Volume of Moist Air
Specific volume is defined as the total volume of humid air per mass unit of dry air.
Temperature and Moisture Holding Capacity of Air
The moisture holding capacity of air varies with temperature
The relation between Specific and Relative Humidity of Air
Calculate the specific humidity of moist air knowing the relative humidity, water vapor and air density
US Design Outdoor Temperature and Relative Humidity - Winter and Summer
Outdoor temperatures and relative humidity's in different US states and cities summer and winter
Water Saturation Pressure
Water saturation pressure at temperatures ranging 0 - 100 deg C and 32 - 700 deg F, in Imperial and SI Units
Water Vapor - Weight in Air
Weight of water vapor in air
Water Vapor and Saturation Pressure in Humid Air
The saturation pressure of water vapor in moist air vary with temperature.
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