Re: [Vo]:different temperatures
In reply to Jed Rothwell's message of Fri, 17 Nov 2023 19:26:01 -0500: Hi, [snip] >Robin wrote: > > >> I have an electric heater that can be controlled to within 1/10 of a >> degree centigrade . . . > > >That is remarkable. That is a laboratory grade thermostat. I should have said precision, not accuracy. It can be done with a DS18B20, a microprocessor, and a relay. [snip] Actually, the sensor is under the window, so cold air coming off the window will fall onto the desk, and hit the sensor. >Get an IR camera! >(Borrow one . . . they are expensive.) No, not worth the trouble. Buy electric cars and recharge them from solar panels on your roof.
Re: [Vo]:different temperatures
Robin wrote: > I have an electric heater that can be controlled to within 1/10 of a > degree centigrade . . . That is remarkable. That is a laboratory grade thermostat. > The only explanation I can think of is that the house is well insulated > and has a long time constant, so that early in > the morning the walls are still warm from the previous afternoon, while > the air in the room is cool, thanks to contact > with the cooler glass window, resulting in the thermostat registering a > low temperature . . . That is interesting. Put a thermometer near the windows. Get an IR camera! (Borrow one . . . they are expensive.)
[Vo]:different temperatures
Hi, I have an electric heater that can be controlled to within 1/10 of a degree centigrade, and also temperature monitoring software that reports the temperature. I have noticed that early in the morning I am comfortable with a temperature of 22ºC, but as we approach noon I need the temperature to be about 25ºC. Initially, I thought this was strange because the external temperature is colder early in the morning. The only explanation I can think of is that the house is well insulated and has a long time constant, so that early in the morning the walls are still warm from the previous afternoon, while the air in the room is cool, thanks to contact with the cooler glass window, resulting in the thermostat registering a low temperature, while my body still feels comfortably warm due to thermal radiation from the walls. As the day progresses, the temperature of the walls drops, forcing my body to rely more heavily on air temperature, so I need the temperature to be higher. Thoughts? Buy electric cars and recharge them from solar panels on your roof.
