Air Psychrometrics
The study of moist and humid air - air condition - psychrometric charts, Mollier diagrams, air temperature, absolute and relative humidity, moisture content and more .
Sponsored Links
Absolute Humidity of Air
Humidity - or moist - is the water vapor present in air. Commonly used terms are 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 - Specific Heat at Constant Temperature and Various Pressures
Specific Heat Capacity of air at constant temperature 20oC and pressure ranging 0.01 to 100 atm
Air Composition
Dry air is a mechanical mixture of nitrogen, oxygen, carbon dioxide and more
Air Humidifying with Steam - Imperial Units
Amount of vapor (lb/h in 100 cfm) in humid air
Air Properties
Temperature, density, specific heat, thermal conductivity, expansion coefficient, kinematic viscosity and Prandtl's number for temperatures ranging -150 - 400 oC
An Introduction to Psychrometry
An introduction to air psychrometrics
Changing Air Condition by Heating, Cooling, Mixing, Humidifying or Dehumidifying Processes
Basic air condition processes - heating, cooling, mixing, humidifying and dehumidifying by adding steam or water - psychometric diagrams and the Mollier charts
Comparing Mollier Diagrams and the Psychrometric Charts
Transforming between psycrometric charts and Mollier diagrams
Cooling Tower Efficiency
The maximum cooling tower efficiency is limited by the wet-bulb temperature of the cooling air
Sponsored Links
Cooling and Dehumidifying Air
Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling
Daltons Law and Pressure in Moist Air
Pressure in a mixture of dry air and water vapor - humid or moist air - can be estimated by using Daltons Law
Dehumidfication in Psychrometric Charts
A dehumidification tutorial with psychrometric charts
Dehumidifiers
Classification of dehumidifiers
Densities and Specific Volumes of Dry Air and Water Vapor
Densities and specific volumes of dry air and water vapor at temperatures ranging 225 to 900 degF (107 to 482 degC)
Density of Dry Air, Water Vapor and Moist Humid Air
Calculate the density of dry air, water vapor or the mixture of air and water vapor - moist or humid air
Density of Moist Air
Density of moist air - pressure ranging 75 - 1000 mm Hg
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 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 - enthalpy is used to calculate cooling and heating processes
Sponsored Links
Evaporation from Water Surfaces
The amount of evaporated water from a water surfaces - like swimming pools or an open tanks - depends on the temperature in the water and in the air, and the humidity and velocity of the air above the surface - online calculator
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
Heat Humidity Factor
Moisture - temperature and heat humidity factor
Heat Removed by Air
Heat removed with air - dry and wet bulb temperature
Heating Humid Air
Calculating enthalpy change and temperature rise when heating moist and humid air without adding moisture
Humid Air and the Ideal Gas Law
The Ideal Gas Law relating pressure, temperature, and volume of an ideal or perfect gas used for air with water vapor - or 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 (GPP) is the ratio between actual mass of water vapor present in moist air - to the mass of dry air
Ideal Gas Law
In perfect or ideal gas the change in density is directly related to the change of temperature and pressure as expressed by the Ideal Gas Law
Latent Heat Flow
Latent heat is the heat, when supplied to or removed from air, results in a change of moisture content - the temperature of the air is not changed
Maximum Moisture Content in Air
Moisture limit in air varies with temperature
Measuring Air Humidity
Measuring relative air humidity with dry and wet bulb temperatures
Mixing Humid Air
Calculating enthalpy, heat, temperature and specific humidity in mixing humid air
Moist Air Properties
A psychrometric table with moist humid air properties
Moist Air and Degree of Saturation
The ratio of humidity ratio of moist air to humidity ratio of saturated moist air - the Degree of Saturation
Mole Fraction of Water Vapor in Moist Air
Mole fraction of water vapor expresses 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
Mollier Diagram
The Mollier diagram is a graphic representation of the relationship between air temperature, moisture content and enthalpy - and is a basic design tool for building engineers and designers
Outdoor Temperature and Relative Humidity - US Winter and Summer Conditions
Outdoor design temperature and relative humidity in US states and cities - summer and winter
Outdoor to Indoor Temperature Rise and Relative Humidity
The relationship between outdoor and indoor temperature rise - and the effect on the relative humidity
People and Heat Gain
Heat Gain from Occupants in Air Conditioned Spaces - in btu/hr
Persons and Metabolic Heat Gain
Metabolic heat gain from occupants in air conditioned spaces at different degrees of activities - in Watts
Pressure and Maximum Content of Water in Saturated Air
Air pressure and maximum content of water in saturated air
Psychrometric Chart - Barometric Pressure 29.921 inches of Mercury
A psychrometric chart in English units - temperature ranging from 20oF to 120oF
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
Psychrometric Table - 29.92 Inches of Mercury
Dry and wet bulb temperature, pressure and weight saturated water vapor and air saturated with water vapor
Psychrometric Terms
Dry Bulb and Wet Bulb Temperature, Specific Volume, Relative Humidity, Enthalpy and more ..
Recommended Indoor Temperature versus Outdoor Temperature
Recommended indoor effective temperatures at various outdoor dry-bulb temperatures
Recommended Indoor Temperature versus Outdoor Temperature
Recommended indoor effective temperatures at various outdoor dry-bulb temperatures
Recommended Relative Humidity in Production and Process Environments
Recommended Relative Humidity - RH - in production and process environments like libraries, breweries, storages and more
Relative Humidity of Air
The relative humidity of air 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 vary 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 relationship between Specific and Relative Humidity of Air
Calculating specific humidity of moist air knowing relative humidity, water vapor and air density
Vapor Pressure in Moist Air
Vapor pressures in moist air from dry and wet bulb temperatures
Water Flow Hose - Pressure Loss
Pressure loss due to friction
Water Saturation Pressure
Water saturation pressure at temperatures ranging 0 - 100 oC and 32 - 700 oF - 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 varies with temperature
