Automatic set point detection for water heaters operating in a demand response
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United States of America Patent
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Jun 5, 2018
Issued Date -
N/A
app pub date -
Dec 21, 2015
filing date -
Dec 22, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An electric water heater that includes a thermostat is retrofitted for remote control as follows. A relay is installed on an electrical feed to the electric water heater. Water temperature and electric current or power through the electrical feed are measured over time with the relay closed, and the thermostat deadband maximum and minimum are detected as the water temperature at which the thermostat turns the heating element off, and the water temperature at which the thermostat turns the heating element on, respectively. The detected thermostat deadband maximum and minimum are stored as load controller deadband maximum and minimum, respectively. The thermostat set point is raised, and the electric water heater is thereafter controlled using the load controller by operations including closing the relay when the water temperature falls below the load controller deadband minimum and opening the relay when the water temperature rises above the load controller deadband maximum.
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International Classification(s)
- F24H:FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING H....
- G06N:COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL M....
- H05B:ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE ....
- G05B:CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTION....
- G05D:SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC....
- G05F:SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIAB....
- F24D:DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL H....
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