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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Resources, Tools and Basic Information  for Engineering and Design of Technical Applications!

Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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