Abstract: An energy conservation system that realizes optimized power demand control for alternating current electrical motors equipped with variable frequency drives is implemented by switching an electrical motor via bypass systems from a variable frequency and speed drive mode of operation to a constant frequency and speed drive mode of operation and from a constant frequency and speed drive mode of operation to a variable frequency and speed drive mode of operation. The switching from one mode of operation to another is automatically executed based on the comparative analysis of historical and current trends of the electrical motor actual power demand at variable and constant speed drive modes of operation at various loads. The system optimizes the electrical motor operation by selecting the mode with the lower magnitude of cumulative power demand for the motor and motor drive at a given motor load.

Abstract: An energy conservation system that realizes optimized power demand control for alternating current electrical motors equipped with variable frequency drives is implemented by switching an electrical motor via bypass systems from a variable frequency and speed drive mode of operation to a constant frequency and speed drive mode of operation and from a constant frequency and speed drive mode of operation to a variable frequency and speed drive mode of operation. The switching from one mode of operation to another is automatically executed based on the comparative analysis of historical and current trends of the electrical motor actual power demand at variable and constant speed drive modes of operation at various loads. The system optimizes the electrical motor operation by selecting the mode with the lower magnitude of cumulative power demand for the motor and motor drive at a given motor load.

Abstract: The present invention is related to a wide variety of thermostats and thermostats/humidistats for air temperature and relative humidity control in buildings having heating, cooling and humidification systems. We suggest using a forced air device to take a representative air sample near the building occupant's location in order to enhance indoor climate control and improve its accuracy. When this forced air device is used, the existing standard thermostat or standard thermostat/humidistat becomes a non-inertial thermostat or thermostat/humidistat. We also suggest to equip non-inertial programmable thermostat or thermostat/humidistat as well as standard programmable thermostat or thermostat/humidistat with an advisory computing system. This system will provide the occupant with a guiding tool and enable him to make an informative decision about set points selection in relation to the projected energy savings or energy over-consumption at particular mode of operation, as compared to the base set points.