Table of Contents
What is the use psychrometer?
A psychrometer measures humidity by taking both a wet-bulb and a dry-bulb temperature reading. With those two values known, the other properties of the air, including its moisture content, can be determined by computation or by reading a psychrometric chart.
Why is a psychrometer important?
It is a useful instrument to keep in the house. It measures the quantity of water vapor in the air or relative humidity. Information about the relative humidity is obliging in understanding the weather. A psychrometer is an instrument that counts both the wet-bulb and dry-bulb temperatures.
What are the uses of psychrometric chart?
A psychrometric chart presents physical and thermal properties of moist air in a graphical form. It can be very helpful in troubleshooting and finding solutions to greenhouse or livestock building environmental problems.
What is sling psychrometer write its use?
A sling psychrometer can be used to find relative humidity, which is expressed as a percentage. It is computed by multiplying the amount of moisture in the air at a given temperature, dividing by the maxi- mum amount of moisture the air could contain at that same temperature, and then multiplying the quotient by 100.
Where are humidistat used?
Humidistats are used in a number of devices including dehumidifiers, humidifiers, and microwave ovens. In humidifiers and dehumidifiers the humidistat is used where constant relative humidity conditions need to be maintained such as a refrigerator, greenhouse, or climate-controlled warehouse.
What is wet and dry bulb psychrometer?
Psychrometer. an instrument for measuring the humidity and temperature of the air. The dry-bulb thermometer shows the temperature of the air, and the wet-bulb thermometer, whose bulb is wrapped with wet cambric, shows a temperature that is dependent on the amount of evaporation from the surface of its bulb.
When was the first psychrometer invented?
In 1818, a German inventor, Ernst Ferdinand August (1795-1870), patented the term “psychrometer”, deriving from the Greek language meaning “cold measure”. The psychrometer is a hygrometric instrument based on the principle that dry air enhances evaporation, opposed to wet air, which hinders it.
What is psychrometer or hygrometer?
The psychrometer, or hygrometer, measures the difference between dry-bulb and wet-bulb thermometer readings. Ref: Pryor, 3. ii. The determination of the psychrometric properties of air at a given state point.
Who invented the psychrometric chart?
Willis Carrier is known as the Father of Air Conditioning. He also invented the psychrometric chart. It was a result of his research studying the effects of heat and humidity on heat and cooling comfort.
What is saturation line in psychrometric chart?
The curved “maximum water vapor line” is called the “saturation line.” It is also known as 100\% relative humidity, abbreviated to 100\% rh. At any point on the saturation line, the air has 100\% of the water vapor per pound of air that can coexist with dry air at that temperature.
What is hygrometer used to measure?
hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.
What is Kata thermometer?
Kata-thermometer meaning (measuring instrument) A device consisting principally of an alcohol thermometer, used to measure air cooling power and, indirectly, small wind speeds in circulating air, by measuring the time taken for the temperature of the bulb of alcohol to make a specified drop (100° to 95°F).
What are the main parts of a psychrometer?
The two main parts of a psychrometer are: a wet-bulb thermometer and a dry-bulb thermometer.
What unit does a psychrometer measure in?
Relative humidity can be measured by an instrument called a hygrometer. The simplest hygrometer-a sling psychrometer-consists of two thermometers mounted together with a handle attached on a chain. One thermometer is ordinary.
What does a sling psychrometer measure?
The sling psychrometer is used to measure relative humidity. This is one of the simpler designs of psychrometers available on the market. It consists of two thermometers, a wet bulb and dry bulb.
How does a sling psychrometer work?
The sling psychrometer calculates humidity by measuring how much evaporation contributes to cooling. A sling psychrometer consists of two thermometers. One is left dry to record the true temperature, while the other is covered in water. The wet thermometer is then swung around, causing some of the water to evaporate.