A method of controlling a liquid movement system, such as a pool system. The method includes receiving a maximum time that an auxiliary load is to operate, receiving a minimum pump speed of a pump system that pumps a liquid through the auxiliary load, monitoring the time that an auxiliary load has been in operation, monitoring the pump speed of a pump system that pumps a liquid through the auxiliary load, and deactivating the auxiliary load if the maximum time or minimum pump speed has been met. Also disclosed are a pool system and a controller for controlling the pool system.

An improved compressed air system utilizes one or more base compressors, such as fixed speed drive compressors, to meet the compressed air demands and one or more trim compressors, such as variable speed drive compressors, to meet the variations in the demand. The operation of both the base and trim compressors may be controlled to provide improved overall efficiency while meeting the transient load demands. The control may spread the demands over the various base compressors to improve the overall loading on each base compressor. Efficiency metrics may be utilized to control the switching between base and trim compressors. Unloading of a base compressor may be controlled to avoid undesirable changes in system performance.

A modular fan housing configured to hold an array of motors and fans is provided. The modular fan housing is configured for use in an air-handling system that delivers air to a ventilation system for at least a portion of a building. The fan housing comprises a plurality of modular units configured to be stacked adjacent to one another in at least one row or column to form an array. The modular units each include an interior surface and have a front end and a back end that define a chamber. The chambers are configured to receive the motors and fans. Sound attenuation layers extend along at least a portion of the interior surface of the corresponding chambers. The sound attenuation layers are positioned between at least some of the adjacent chambers.

A continuous slag processing system includes a rotating parallel disc pump, coupled to a motor and a brake. The rotating parallel disc pump includes opposing discs coupled to a shaft, an outlet configured to continuously receive a fluid at a first pressure, and an inlet configured to continuously discharge the fluid at a second pressure less than the first pressure. The rotating parallel disc pump is configurable in a reverse-acting pump mode and a letdown turbine mode. The motor is configured to drive the opposing discs about the shaft and against a flow of the fluid to control a difference between the first pressure and the second pressure in the reverse-acting pump mode. The brake is configured to resist rotation of the opposing discs about the shaft to control the difference between the first pressure and the second pressure in the letdown turbine mode.

A centrifugal pump unit (1) is disclosed having a body (4) that includes a suction connection (5), a pressure connection (6) and a pump chamber (7) connecting the suction and pressure connections. The centrifugal pump unit further includes an impeller (8) disposed in the pump chamber and at least one electromagnetic flow sensor (3) arranged to measure flow in at least a part of the suction connection and/or pressure connection and/or pump chamber for determining a flow rate of a fluid through the centrifugal pump unit or for determining a control signal equivalent of the flow rate for control purposes.

A pumping system for at least one aquatic application comprises a motor coupled to a pump and a controller in communication with the motor. The controller may be adapted to determine a first motor speed, determine a present flow rate using curves of speed versus flow rate for discrete power consumptions, generate a difference value between the present flow rate and a reference flow rate, and/or drive the motor at a second motor speed based on the difference value until reaching a steady state condition.

A cooling fan and an air-cooled refrigerator are provided. The cooling fan includes a synchronous motor and an impeller. The synchronous motor includes a stator and a permanent magnetic rotor. The permanent magnetic rotor includes a rotary shaft and a permanent magnetic rotor main body attached around the rotary shaft. The stator includes a stator core and a stator winding wound around the stator core and powered by an alternating-current power supply. The permanent magnetic rotor operates at a constant rotational speed of 60f/p during a steady state operation of the motor, where f is a frequency of the AC power source and p is the number of pole pairs of the permanent magnet poles. The impeller is connected to the rotary shaft for rotation under the driving of the rotary shaft.

A molding machine for molding material is provided. The machine includes a cavity to be filled with molten metal and a conduit system leading to the cavity, thus forming a system of interconnected hollow spaces. At least one pressure member is moveable in at least part of the conduit system. A centrifugal pump in fluid communication with a reservoir of molten metal is provided, the pump providing molten metal to the hollow space receiving the at least one pressure member.

Some embodiments of an infusion pump system can employ a number of power management techniques to avoid using substantially excessive power during operation of the pump drive system. Thus, the infusion pump system can draw upon the energy supply in an efficient manner that extends the useful life on the power supply. Furthermore, the infusion pump system can be configured estimate an amount of power remaining to operate the pump system without the requirement of directly detecting the remaining charge on power supply device (e.g., without detecting the remaining charge on a battery). As such, the infusion pump system can readily inform a user of a particular estimated amount of time remaining for medicine dispensing operations.

A well production method uses side gas lift valves above a packer and an ESP below the packer. In a gas lift mode, a controller turns the ESP motor off, and shifts a tubing valve below the packer to a gas lift position while flowing gas down the casing. While in the gas lift mode, a pressure gauge monitors motor lubricant pressure, which correlates with a flowing bottom hole pressure of the well fluid in the lower casing annulus. In an ESP mode, the controller stops the flow of gas from the gas source, shifts the tubing valve to an ESP position and turns on the motor, causing well fluid to flow through the pump intake. The pressure gauge continues to monitor the lubricant pressure during the ESP mode.