Wet steam contains liquid droplets that have not changed its phase. Dry steam must be used for heating applications for better product quality. Dryness fraction of steam should be as high as 97-98%.

Dryness fraction of steam is weight of steam to weight of steam & moisture present along with steam and it is used to quantify amount of water present in the steam. Dryness fraction of steam is important as it has direct impact on total amount of transferable energy present within the steam, which directly affects heating efficiency and product quality.

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Source –Wet Steam

A carpet cleaner, also called a carpet steam cleaner or carpet
steamer, is sometimes also confused with other types of steam cleaners,
as well as  steam mops and hard floor steam cleaners. There seems to be a
lot of confusion as to the difference between a vacuum and a carpet
cleaner.  Even retailers often incorrectly include carpet cleaners in
vacuum categories, but these two floor care appliances are not the same
type of cleaning machine.  While both will clean your carpet – a vacuum
removes dust, dirt by dry suction; a carpet cleaner sprays hot water and
solution on the carpet, scrubs and then removes the dirty water and
solution.  A vacuum will not remove stains; that’s a job for a carpet
cleaner.

A carpet cleaner, also known as a carpet extractor or
carpet shampooer, is designed to remove deeply embedded dirt and stains
in carpets. For optimal results, the machines work as follows: Users
pretreat the carpet by spraying it with a cleaning solution and letting
it soak in, or dwell, for about 15 minutes. Then, operators use the
carpet cleaner, which pumps water into the carpet and extracts the
dirty, soapy fluid with a high-powered vacuum. Some units include
components to heat the rinse water, others don’t.

Key Components

Pump:

This
component generates the pressure that injects the water into the
carpet. Pump pressure levels generally range from 60 pounds per square
inch (psi) to 500 psi.

Vacuum:

The vacuum in the
carpet cleaner extracts dirty water and cleaning solution from the
carpet and empties it into an extraction tank. Vacuums are driven by
motors that come in a variety of configurations, including: single
2-stage motors, two 3-stage motors, and three 2-stage motors. For
optimum performance, choose a motor with at least two stages.

The
power of a vacuum motor is commonly measured in airflow (cubic feet per
minute, or CFM) and water lift (inches). Airflow refers to the movement
of air through the machine and typically ranges from 100 to more than
200 CFM. Water lift measures the suction strength of the vacuum and
typically ranges from 100 to more than 250 inches.

Solution Tanks:

These tanks hold the rinse water. Typically, solution tanks range in size from 4.5 gallons to 17 gallons.

Recovery Tanks:

These
tanks hold extracted dirt, cleaning chemicals, and water. Typically,
recovery tanks range in size from 4.5 gallons to 15 gallons.

Heating Unit:

This
component heats the rinse water to temperatures as high as 210ºF in as
little as three minutes. Heating elements can range from single
tank-heating models, which heat water in the solution tank, to double
inline heating elementsPsychology Articles, which heat water as it exits the machine.

Accessories:

Carpet
cleaners usually come with a large floor wand. The wand can range in
width from 10 inches to 12 inches and include one or two jets for
dispensing and extracting fluids. Upholstery and stair wands are
available as options. Vacuum and cleaning solution hoses come in a
variety of lengths and can be ordered in custom lengths.

Auckland Carpet Cleaners has been using their Carpet Cleaning Process to deliver excellent carpet cleaning and
related cleaning services to residents of Auckland since 1987. We offer
environmentally friendly carpet cleaning service that are safe for kids
& pets in our 5-Step Steam Cleaning Process. .