What are different types of psychrometric processes?
PSYCHROMETRIC PROCESSES
- A view of psychrometric chart is shown:
- The different psychrometric processes are shown:
- Sensible Cooling.
- Sensible Heating.
- Cooling and Dehumidification.
- Sensible Heat Factor (SHF)
- Heating and Humidification.
- Cooling and Humidification.
What are the four psychometric process of air and explain each of them?
Some of the common psychrometric processes carried out on air are: sensible heating and cooling of air, humidification and dehumidification of air, mixing of various streams of air, or there may be combinations of the various processes.
What is psychrometric properties of air?
It is defined as the ratio of mass of water vapour to the mass of dry air in a certain amount of moist air. It is also known as humidity ratio or percent humidity. Unit of specific humidity is kg of water vapour/ kg of dry air or gm of water vapour /gm of dry air.
Which psychrometric process is performed in summer air conditioning?
Cooling with dehumidification process
12 Write the name of the psychrometric process which can be used for summer air conditioning ANSWER: Cooling with dehumidification process is used for air conditioning in summers. The process is carried out by passing the air over a cooling coil whose temperature is lower than the D.P.T. of the air.
What is psychrometric process?
a psychrometric process that involves the increase or decrease in the temperature of air without changing its humidity ratio. Example: passing moist air over a room space heater and of kiln air over the heating coils.
Which are the 5 factors indicated on a psychrometric chart?
About the Psychrometric Chart
- dry bulb temperature.
- wet bulb temperature (also known as saturation temperature)
- dew point temperature.
- relative humidity.
- moisture content (also known as humidity ratio)
- enthalpy (also known as total heat)
- specific volume (the inverse of density)
What is the process of the psychrometric chart?
A Psychrometric chart graphically represents the thermodynamic properties of moist air. Standard psychrometric charts are bounded by the dry-bulb temperature line (abscissa) and the vapour pressure or humidity ratio (ordinate). The Left Hand Side of the psychrometric chart is bounded by the saturation line.
What does psychrometric stand for?
Psychrometrics (or psychrometry, from Greek ψυχρόν (psuchron) ‘cold’, and μέτρον (metron) ‘means of measurement’; also called hygrometry) is the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.
What is the process of air conditioning?
As the liquid refrigerant inside the evaporator coil converts to gas, heat from the indoor air is absorbed into the refrigerant, thus cooling the air as it passes over the coil. The indoor unit’s blower fan then pumps the chilled air back through the home’s ductwork out into the various living areas.
How is humidification done in the air?
Moisture is added to the air by releasing steam kept at a temperature that is higher than the dry bulb temperature of the surrounding air. When the surrounding air mixes with the warm steam, the moisture droplets in the steam evaporate as they adjust to the temperature of the surrounding air.
What is the principle of a 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.
Which is not a psychrometric property of air?
Hence partial vapour pressure is not shown on psychrometric chart.
How do you say psychrometric?
How To Say Psychrometry – YouTube
What are the 3 types of air conditioning system?
Ducted Air Conditioning.
Why is it called air conditioning?
Coining the Term “Air Conditioner”
Soon after Willis Carrier came out with his invention, a mill engineer named Stuart Cramer created a similar device that added moisture to the stale, hot air inside textile plants. He called his invention an “air conditioner” because it conditioned the air to be moist and cool.
Why is air humidified?
What is a humidifier? Humidifier therapy adds moisture to the air to prevent dryness that can cause irritation in many parts of the body. Humidifiers can be particularly effective for treating dryness of the skin, nose, throat, and lips. They can also ease some of the symptoms caused by the flu or common cold.
Why do we use psychrometer?
Psychometric tests can be used for a variety of purposes, including: Selection of personnel. Tests can help recruiters and hiring managers to spot the candidates who best fit a position. Personality, aptitude and knowledge tests are particularly useful here.
Who developed psychrometric chart?
The invention of the psychrometric chart by Willis Carrier in 1904 helped to quantify the temperature decrease caused by evaporative cooling in greenhouses (Fig. 6). The chart can be used to measure the wet bulb temperature for a given relative humidity and dry bulb or ambient air temperature.
What is the unit of AC?
The measurement for heat is the British thermal unit (BTU). One ton of air conditioning can remove 12,000 BTUs of air per hour. A four ton unit can move 48, 000 BTUs and so on. Therefore, the more tonnage an AC unit is rated at, the more air it can cool.
What are the 4 process of refrigeration?
A refrigeration cycle has four major components: the compressor, condenser, expansion device, and evaporator. Refrigerant remains piped between these four components in the refrigerant loop.
What is the working principle of air conditioner?
Air conditioning operates based on the principles of phase conversion, which is the transformation of a material from one state (or phase) of matter to another, such as when a material changes from a liquid to a gas. When a liquid to gas change occurs, the material absorbs heat.
Does humidifier increase oxygen?
Humidifiers increase the amount of oxygen in the room, which can reduce headaches, prevent fatigue, help you sleep better, and make you feel more energetic overall.
What happens when air is humidified?
What is 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.