Load controller having time integrated demand

A controller for a stored energy heater, supplying thermal energy from a power source to a system having varying heat requirements during preset cyclic power on-power off intervals, for adjusting energy storage during power on periods comprising;

• a heater having heat energy storage, wherein storage media temperature indicates available heat;
• means determining successive heater sampling intervals within said power on periods;
• means measuring and retaining storage temperatures on initiation of each said interval;
• means determining and retaining the energy input level for an immediately preceding interval;
• means determining an expected storage temperature based on said measured storage temperature, said energy input level at said interval onset, and interval duration;
• means comprising said measured and expected storage temperature and generating an energy difference signal;
• means comparing said difference signal with a predetermined signal band;
• means adjusting said storage energy input so as to bring said storage temperature within said signal band.

A controller for adjusting storage temperatures in a stored energy heater supplying continuous heat from electric power to a system heat load having varying heat demands, during predetermined, cyclic power off periods comprising;

• means establishing power off and power on periods;
• means measuring storage and load temperatures at predetermined times within said period;
• means determining the heat storage level at said measurement time based on said storage and load temperatures;
• means determining a current heat demand based on said load temperatures;
• means determining a level of storage power input based on said demand and power on interval;
• whereby tank storage is adjusted in a power on period to meet system demands during a succeeding power off period.

In a controller for adjusting storage temperatures in a stored energy heater utilizing electrical energy and limiting an overall user electrical load to a pre-determined maximum, comprising;

• means establishing a measurement interval;
• means measuring and storing a first heater storage temperature during said interval;
• means measuring and storing a second heater storage temperature in a succeeding interval;
• means comparing said first and second temperatures, and generating a power level signal;
• means measuring overall user electrical load and establishing a current load signal;
• means comparing said power level and current overall electrical load signals with a predetermined value, and generating a load adjustment signal;
• means responsive to said adjusting signal, for varying heater electrical input;
• wherein heater storage is adjusted to accomodate varying demand, within said predetermined maximum.