Can AI replace this forum?

Why? Just tell them you don't want their advice, and tell them to "go away".
But they don’t always take no for an answer !

Normally these AI guided robots only target a minority. They estimate your spending power and target you if they think you are after an expensive product ignoring those that might be after a toaster. Once targeted you would be surprised at their tenacity

I could write a long chapter on my dealings with DSG, parent co of Currys !
 
But if it's blocked, it does not clean, so still not a vacuum cleaner. The reason, called an air velocity cleaner, is on hard floors you need a gap floor to nozzle. This was demonstrated to me by the Johnson guy from the road sweeper company, dropped with 1/4" gap the half brick remained on the road, with an inch gap it sucked up the half brick, I think the motor was a little over the allowed size for a vacuum cleaner, around 50 kW, it seems now 900 watt is the limit, however I note my leaf blower/sucker still has a 3 kW motor, so it seems no one takes any notice of the limit.

The limit only applies to domestic machines not e.g. https://www.quirepace.co.uk/product/ti80/ and "air velocity" is the key. For example, if you have a garden vac you can clean up the leaves over gravel and will never, ever pick up the gravel itself. Big machines, like the one illustrated are available with many different hose diameters depending on the product to be picked up, and for some products it is necessary to use an aerating pick up tool to ensure the product doesn't become a solid lump in the hose - you need the air to keep the product flowing in the air stream. Vacuum cleaners operate in the ball park of 15-30 m/s to have decent pick up power, so the bigger the orifice the more airflow in m3/min you need. The figures quoted on vacuum cleaner spec sheets are virtually meaningless, because maximum vacuum is always quoted with zero flow, and maximum airflow is always quoted with zero vacuum.

The calculations get very interesting because, for example, if you calculate the air volume flow at the inlet, the air volume flow through the turbine will be higher because the reduction in pressure has caused the air to expand, so you always need a turbine with a higher flow rating than your calculations require at the inlet to achieve the desired velocity.
 
I beg to differ ! A vacuum cleaner if blocked will produce a partial vacuum ! In theory even space is not a perfect vacuum !
Are you trying to hijack an AI thread :)?

Providing specific values for airflow can help illustrate the differences between industrial and domestic vacuum cleaners more clearly. Airflow in vacuum cleaners is typically measured in cubic feet per minute (CFM) or litres per second (L/s). Below are the typical airflow values for both types of vacuum cleaners:

Airflow Values for Vacuum Cleaners
  1. Domestic Vacuum Cleaners:
    • Airflow: Typically, domestic vacuum cleaners have airflow values ranging from 50 to 100 CFM (24 to 47 L/s).
    • Example: A high-end domestic vacuum cleaner might have an airflow of around 80 CFM (38 L/s), which is sufficient for household cleaning tasks such as vacuuming carpets, hard floors, and upholstery.
  2. Industrial Vacuum Cleaners:
    • Airflow: Industrial vacuum cleaners generally have much higher airflow values, often ranging from 150 to 300 CFM (71 to 142 L/s), and some specialized models can exceed this range.
    • Example: A powerful industrial vacuum cleaner might have an airflow of 250 CFM (118 L/s), which is necessary for handling large debris, continuous operation, and more demanding cleaning environments such as construction sites or factories.
Comparison and Importance of Airflow
  • Suction Power and Debris Handling:
    • Higher airflow in industrial vacuums allows them to generate stronger suction power, essential for picking up heavier and larger debris. For instance, industrial models can handle materials like metal shavings, wood chips, and heavy dust, which are commonly found in manufacturing and construction environments.
    • Domestic vacuums, with their lower airflow, are optimized for everyday household debris such as dust, pet hair, and small particles. This makes them more energy-efficient and quieter, suitable for residential use.
  • Filtration and Maintenance:
    • Industrial vacuums require robust filtration systems to manage high airflow without significant pressure drops. They often include features like multi-stage filtration and self-cleaning filters to maintain consistent performance.
    • Domestic vacuums focus on balancing effective filtration with maintaining adequate airflow. High-end domestic vacuums might use HEPA filters to capture fine particles and allergens while ensuring the airflow is sufficient for typical household cleaning.
  • Cooling and Durability:
    • The higher airflow in industrial vacuums also aids in cooling the motor, which is crucial during prolonged use in demanding conditions. This prevents overheating and extends the vacuum’s operational life.
    • Domestic vacuums, designed for shorter, less intense cleaning sessions, manage with lower airflow and simpler cooling mechanisms. However, maintaining airflow through regular cleaning of filters and dust containers is still important for performance and longevity.
Specific Examples
  • Dyson V11 (Domestic):
    • Airflow: Approximately 55 CFM (26 L/s).
    • Use Case: Suitable for general household cleaning, offering good suction power and filtration for dust, pet hair, and small debris.
  • Nilfisk GM 80P (Industrial):
    • Airflow: Approximately 87 CFM (41 L/s).
    • Use Case: Versatile industrial vacuum suitable for various applications, including cleanrooms and manufacturing facilities, where both fine and coarse debris are present.
  • Makita VC4710 (Industrial):
    • Airflow: Approximately 135 CFM (64 L/s).
    • Use Case: Ideal for construction sites and workshops, capable of handling larger debris and continuous operation with robust filtration systems.
Conclusion
Specific airflow values highlight the differences in design and application between domestic and industrial vacuum cleaners. Industrial vacuums, with higher airflow, are built for rigorous environments and tasks, while domestic vacuums balance efficiency and performance for everyday household cleaning. Understanding these values can help users select the appropriate vacuum cleaner for their needs, ensuring optimal performance and longevity.
 
@Comlec - Nothing you have written is incorrect, except airflow alone is only half the story. If you have a huge pipe, you could have huge airflow in m3/s but the velocity could be so slow you would barely pick up a piece of paper. The key to effective vacuum cleaning is air velocity, and this is the figure we target (or our engineers do - yes this is my day job!) when we design e.g. central vacuum cleaning systems with multiple inlets. We need to achieve target air velocities with the chosen hose size and hence this informs the airflow volume we need and the size of the exhauster/pump. With multiple inlets that might be used simultaneously the spine pipe is graduated in size to ensure that the air velocity is always high enough to keep the product in suspension, otherwise you get the particles dropping out of the airflow and causing a potential blockage, but velocity cannot be allowed to be too high or the system will not work due to friction losses.

It's just like a hose pipe and water pressure in reverse - open hose end and the water flow won't push a pebble, close the opening down, and the actual flow rate in l/s will decrease a bit because of the back-pressure, but the jet of water now has the velocity to push that pebble.
 
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