Don’t Get Hot with Your Vacuum Cleaner

Many people choose their vacuum cleaner based on suction and power, believing more is better. Let’s compare a 1000W with a 1400W vacuum cleaner using a floor tool and a crevice tool.

 

Refer to Table B which summarizes the results.

Table B

1000W Vacuum Cleaner 

1400W Vacuum Cleaner

Input Power (W)

1000

1400

Output Power (W)

36.5

40.8

Efficiency = Output/Input (%)

3.6

2.9

Heating Power (W) 

963.5

1359.3

Airflow Floor Tool (l/s)

34.0

35.3

Velocity Pressure Floor Tool (Pa) 

1073

1156

Airflow Crevice Tool (l/s)

22.0

22.8

Temperature Rise Vacuum

Cleaner (°C)

23.5

31.8

Temperature Rise Crevice Tool (°C)

36.2

49.3

Observations:
  • You may find the efficiency for converting electrical power to airpower low and surprised that vacuum cleaners are really excellent room heaters.
  • Why didn’t the additional power provide much more performance? Higher airflow increases turbulence in the vacuum hose, and that decreases efficiency. If the hose diameter and the fitting size were to be increased, that would improve performance, but using a vacuum cleaner with this construction, would make it cumbersome to use.
  • Using velocity pressure as a guide for cleaning ability, a 40% increase in motor power produced only a 7.7% improvement. Velocity pressure has been used as a guide because it’s this that dislodges the dirt particle from the carpet fibre.
  • From room temperature to thermal protector temperature, the user with a 1000W motor vacuum cleaner will be able to vacuum 28% longer, than the user with a 1400W motor vacuum cleaner. A 28% longer run time versus a 7.7% performance improvement, means a 1000W vacuum cleaner would provide a better clean in the same cleaning shift.
  • The temperature rise of the exhaust air when using a crevice tool, means a more powerful motor would also limit the type of floor tool that could be used. A combination floor tool seals better around its edges than a low-profile floor tool. It means that the combination floor creates higher velocity pressure, and cleans better, but the airflow and vacuuming time would be reduced.
  • There is little benefit in using a more powerful vacuum motor for vacuuming. Vacuum cleaner performance can be improved by selecting an alternative floor tool and improving the filtration system.
  • Feb 25, 2022
  • Category: Blog
  • Comments: 0
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