Energy community: towards a detailed simulation and future game plan

The Reef
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@Sterre @alberto

Jean gave us a new version of the simulator, this time taking into account our common washing facilities: Login – Nextcloud

So he raised the common consumption from 10 000 to 15 000 kWh/year.
This corresponds to 44 cycles of the washing machines and dryers, on a weekly basis.

I see he didn’t reduce the consumption of the individual housholds, but we can do that ourselves maybe. -270 kWh/year for the big profile and -170 kWh/year for the small profiles?

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It should add up to the same increase of 5,000 KWh per year, as it is the same stuff that gets washed. @Lee can probably give us a ballpark figure for washing machines’ consumption.

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  • Energy label A class household washing machine: 0.6 kWh per cycle (0.5 on eco-programme)

  • Energy label A class household dryer: 0.8 kWh per cycle

  • Average-on-the-market semi-professional washing machine (i.e. the ones they have in Brutopia): 0.7 kWh per cycle

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So this does not add up.

44 cycles x 52 weeks in a year = 2,288 cycles in a year

Assuming semi-professional washing machines: 2,288 cycles per year x 0.7 kWh = 1,601 kWh per year

Adding dryers: 2,288 cycles per year x 0.8 kWh = 1,830 kWh per year

1.601 + 1,830 = 3,431, so less than 5,000 per year

How about this (assumes we do not always run laundry past the dryer. I, for example, do not own one and would not use it except in an emergency):

What Large units Small units
Number of wash cycles per week 2.5 1.5
Number of wash cycles per year 130 78
Number of dry cycles per week 2 1
Number of dry cycles per year 104 52

With the most efficient washing machines, this becomes:

  • For washing cycles, per year: (130 + 78) x 11 x 0.6 = 1,372.8 kWh
  • For drying cycles, per year: (104 + 52) x 11 x 0.8 = 1,372.8 kWh
  • Total consumption per year: 1,372.8 + 1,372.8 = 2,745.6 kWh

The number 11 stands for the 11 units of each type. The expression between brackets indicates number of cycles by one representative unit per type.

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25

hi alberto,

  • i wouldn’t assume we will be using semi-professional washing machines in the coming years, but the washing and drying machines we have now.
  • I looked up the energy consumption for washing machines and dryers, and i don’t know if it’s linked to the difference semi-professional - ‘normal’ machines, but i arrive at different consumptions:
    • washing machine (label A): 100 kWh/100 cycles
    • drying machine (label A+): 309 kWh/160 cycles
  • If apply these consumptions to your table of usage of large and small units, I arrive at 6154 kWh/year, which is quite a difference and more or less corresponds to Jean’s figure, certainly as not all reeflings will use the common facilities

sources: Energieverbruik droogkast: wat kost het drogen van de was? and Hoeveel stroom & water verbruikt een wasmachine?

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I would recommend sticking with official data sources. For all appliances put on the EU market for which there is an Energy Label, this is the web page with the most up-to-date data: EPREL Public website

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The EPREL site reports more like about 30-50 kWh for 100 cycles for class A and B washing machines; and about 90 kWh for dryers in class B. That’s where the discrepancy comes from.

For reference, my 10 years-old Bosch (this model) used to be in the top energy class at the time. Now it is reported in class C, but even so it consumes 63 kWh per 100 cycles.

I doubt this machine will make it to The Reef. I guess that, when it’s time to move, we will put in the common laundry room the newest and best machines, probably closer to my own estimate than to Jean’s.

2 Likes
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ok, good to know (had missed your post above)

I adapted the simulator with these data of the washing machines and dryers (common consumption + unit consumption) : Login – Nextcloud

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