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Keep the heating in a house all day on?
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Siwastaja:

--- Quote from: EEVblog on October 27, 2021, 10:50:40 am ---Depends on your thermal mass, insulation, and cost of available energy source.
e.g. if you have excess solar during the day then you would absolutely heat during the day and rely on residual heat at night.

--- End quote ---

This is what I'm doing, I have a 3kWp system so during a sunny day run the air-to-water heatpump to store the energy into the 1200 l buffer tank, which then cools down during night back to the starting point. The larger the tank, the lower dT is required to store the same energy. The problem with my 1200l tank is, I need to bring it to some 15degC higher, which already significantly reduces the COP of the heatpump. But it's still way better than selling the power to grid, then buy it back for 2.4x the price. A larger tank would help, but I'm also letting the thermal capacity of the house participate, i.e., the heating water temperature could start dropping already at say 4 a.m., reducing the output power into radiators, but the inside temperature won't fluctuate much if heating is restarted around 10 a.m.
Zero999:
It depends on what temperature you heat the house to, compared to the outside.

I like my house to be on the cool side. I'd rather wear an extra layer, if needs be, so I set the thermostat to 15°C. The timer turns the heating on, just before I get up in the morning and again, when I get home from work. I very much doubt it would be more efficient for it to run 24/7.

I can't remember how much gas and how often my heating kicks in. It hasn't been on since April. It will probably turn on next week, as a cold snap is forecast, which could bring the first frost of the season.
Marco:
Homes built with below slab insulation and minimal above slab insulation will have too much thermal mass to get to a comfortable temperature from cold in a reasonable time frame.

Don't build homes like that.
Siwastaja:

--- Quote from: Zero999 on October 27, 2021, 01:28:05 pm ---I like my house to be on the cool side. I'd rather wear an extra layer, if needs be, so I set the thermostat to 15°C.

--- End quote ---

Sounds very British!

What I mean is not an offence, but a cultural observation that the colder climate you get into, the higher the indoor temperatures. I'm like you and like my house to be on the cool side, also to save energy, to the point many would say I'm almost an extremist...

... but it's not 15degC - it's 20.5degC!

I'd hazard a guess the average here would be 23degC and it's not uncommon at all to set thermostats to 25degC. And if the indoor temperature fluctuates even by +/- 1degC, we instantly complain*. If it ever gets below 20 degC in a rented apartment, we ask for the authorities to perform official measurements and file complaints, or seek criminal charges against the owner; it's considered a health safety issue. At very least, your kids would be taken into custody if somebody heard you live at +15 degC.

*) necessitating a carefully tuned feedforward+P control system as described above by elekorsi

We also are almost hysteric when it comes to mold, and even the idea of dynamic temperature adjustments, or going below 20degC triggers irrational fears that it somehow automatically turns the house into mold nest in no time. This has a grain of truth in it, obviously; some temperature difference between indoors and outdoors is needed to prevent condensation.
Zero999:

--- Quote from: Siwastaja on October 27, 2021, 01:41:22 pm ---
--- Quote from: Zero999 on October 27, 2021, 01:28:05 pm ---I like my house to be on the cool side. I'd rather wear an extra layer, if needs be, so I set the thermostat to 15°C.

--- End quote ---

Sounds very British!

What I mean is not an offence, but a cultural observation that the colder climate you get into, the higher the indoor temperatures. I'm like you and like my house to be on the cool side, also to save energy, to the point many would say I'm almost an extremist...

... but it's not 15degC - it's 20.5degC!

I'd hazard a guess the average here would be 23degC and it's not uncommon at all to set thermostats to 25degC. And if the indoor temperature fluctuates even by +/- 1degC, we instantly complain*. If it ever gets below 20 degC in a rented apartment, we ask for the authorities to perform official measurements and file complaints, or seek criminal charges against the owner; it's considered a health safety issue. At very least, your kids would be taken into custody if somebody heard you live at +15 degC.

*) necessitating a carefully tuned feedforward+P control system as described above by elekorsi

We also are almost hysteric when it comes to mold, and even the idea of dynamic temperature adjustments, or going below 20degC triggers irrational fears that it somehow automatically turns the house into mold nest in no time. This has a grain of truth in it, obviously; some temperature difference between indoors and outdoors is needed to prevent condensation.

--- End quote ---
I don't see how anyone could consider 15°C to be cold, unless they live in the tropics. Admittedly it's a little cool to be scantly dressed but perfectly fine with a jumper on. Heck it's 17°C outside today. I walked to the shop this morning wearing a jumper and by the time I got home, I was too warm and had to take it off.

I find it difficult to sleep in 25°C. When it's that hot, I just wear a pair of boxer shorts in bed: no sheets, blankets, or duvet. If I rented a place which didn't allow me to control the thermostat and it was that hot, I'd open all the windows and not pay the rent, until the landlord sorted it out.

I don't get much mold in my house. Perhaps a little bit around my bedroom window and bathtub, but it's easy to clean off. It's caused by humidity, not cold. I imagine increasing the temperature in my house would make it worse, since warm air holds more moisture, which would condense more on the colder walls and windows.
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