Quote:
Originally Posted by Piwoslaw
OK, first batch of results:
I monitored for two weeks, the first was without a timer, the second was with a timer set to turn the fridge off between midnight and 6am. Here is the raw data: - Week 1: 3.758 kWh over 166.8 hours (no timer),
- Week 2: 3.700 kWh over 168 hours (with timer).
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OK, another two weeks of data:
- Week 3: 3.864 kWh over 167 hours (no timer),
- Week 4: 4.204 kWh over 170.2 hours (with timer).
These numbers are higher than during the first two weeks: With no timer the average this time was 555.3 Wh per day (earlier 540.7 Wh/24h), with timer 592.8 Wh per day (earlier 528.6 Wh/24h).
I think that the reason that both are higher than two weeks earlier is that it's warmer outside, so the indoor temperature is also slightly higher (takes longer to cool down, plus I was forced to up the house's thermostat from 17.5°C to 17.75°C because everyone at home is sick). Also, the week with the timer is even higher since there was more shopping and cooking (more stuff stored in fridge), and a small party (even more stuff in fridge).
As for temperature variations: The digital thermometer I got recorded for the last 2 days of week 3 and all of week 4. Here are the min-max temps:
Without timer: Fridge 3.9°-5.9°C (39°-43°F), kitchen 16.7°-18.7°C (62°-66°F)
With timer: Fridge 3.5°-7.1°C (38°-45°F), kitchen 16.5°-19.8°C (62°-68°F)
The raised t-stat temperature plus extra cooking during week 4 raised the kitchen's max temperature by over 1°C, which also had an effect on the refrigerator's energy usage.
I'll stop this test for now, but will try again next winter. Hopefully then I'll have the test going for much longer.