Demand limit control by integral reset of thermostats
First Claim
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1. A temperature control system for an environmentally controlled space having a central demand limit controller, including:
- thermostat means with said thermostat means including proportional error means and integral error means;
said central demand limit controller connected to said thermostat means with said central demand control means being capable of remotely changing an integral error of said integral error means;
electrical load sensing means for sensing an electrical demand including electrical power drawn by environmental conditioning means for said controlled space; and
said central demand limit controller periodically decrementing said integral error by a fixed amount upon electrical demand for said space exceeding a predetermined limit.
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Abstract
A temperature control system for a building is disclosed utilizing a central demand limit controller. The system includes a number of control modules or thermostats that have both proportional error and integral error functions. The integral error is reset at intervals by an interstage differential to drop single stages of air conditioning. This reduces demand until the maximum allowed demand is met. The integral error function is a timed function and the stages return in a random manner to restore setpoint temperature.
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Citations
7 Claims
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1. A temperature control system for an environmentally controlled space having a central demand limit controller, including:
- thermostat means with said thermostat means including proportional error means and integral error means;
said central demand limit controller connected to said thermostat means with said central demand control means being capable of remotely changing an integral error of said integral error means;
electrical load sensing means for sensing an electrical demand including electrical power drawn by environmental conditioning means for said controlled space; and
said central demand limit controller periodically decrementing said integral error by a fixed amount upon electrical demand for said space exceeding a predetermined limit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- thermostat means with said thermostat means including proportional error means and integral error means;
Specification