two heaters

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If I have two temperature controlled heaters side by side, what will the
outcome be?

Will the two heaters both run at 1/2 the pace they normally would, or will
one heater end up doing all the work?


Re: two heaters

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No simple answer and I don't have the time or the energy to give you a
complex one. It depends on many things. Generally when you have two parallel
loops attempting to control more or less the same thing, one of them will
take over.



Re: two heaters
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Assuming you set the thermostat temperatures as close as possible to
each other one will always end up doing more work than the other but
it depends on a lot of factors as to which one.  (Obviously If one
thermostat is set to start at a higher temperature than the other one
can produce in the room before its thermostat shuts down, then the
higher set one will never start.)


whichever has the thermostat set lowest will start earlier.

the difference in tolerance between the 2 thermostats
as in which cuts in first, and how fast it cuts out compared to the
other when the desired temperature is detected, the speed at which the
bimetal strip bends in response to temperature change compared to the
other one.

One element will also develop more heat than the other due to
manufacturing tolerances. Their resistance as they heat up will also
be slightly different too

The air circulation in the room, placement of each heater in the
room,  whether they are both at the same height (one that is lower
down will cut out last, all other things being equal) and other things


Re: two heaters

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Surely depends on what the 'stats' are set at. If A is set  at 18c it will
cut out when the temp reaches 18c. If B is set at 22c it will cut out at
22c. (over runs etc taken into consideration.) Once the temp starts to drop
B will come back on and start to heat back up, thus not letting A come back
into play. Of course in practical terms there are many variables involved.
In theory I would say in a controlled experiment the one heater (B) would
end up doing all the work.

Metro...



Re: two heaters
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unless they are set to exactly the same setting once the room reaches
the set temperature of the cooler heater the other heater will do most
of the work.

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Re: two heaters

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Just a thought... If both heaters were identical, set to exactly the same
setpoint and
in a room where the heat was uniformly distributed, then they would probably
switch on alternately. This would arise because the heater that had just finished
heating would retain some heat due to heat capacity, and so the other one would
be slightly cooler and would reach setpoint faster.






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