The present invention provides a pump assembly for use in a household appliance comprising a pump, an electric motor having a rotor and a stator and a heat exchanger arranged to be in thermal contact with at least a portion of the stator. There is further provided a heat recovery system for use in a household appliance comprising a main fluid circuit, a fluid reservoir, a heat exchange circuit and a pump assembly for pumping working fluid through the main fluid circuit. The pump assembly comprises an electric motor, a heat exchanger provided in thermal contact with at least a portion of the electric motor, the heat exchanger being configured to transfer heat from the electric motor to a liquid coolant circulating in the heat exchange circuit.

a water pump cooler for CPU wherein coolant may efficiently perform heat exchange, comprising at least: at least a heat absorbing component, at least a heat-transfer water pump, at least a heat exchange component and connecting water pipes, wherein a closed loop is formed by the heat-transfer water pump, connecting water pipes and heat exchange component. The heat-transfer water pump is disposed above the heat absorbing component to serve as a cycle power source for the coolant. The heat-transfer water pump includes at least a water pump component, which includes at least a base plate and a plurality of rotor axial impeller sections and rotor centrifugal impeller sections. The coolant is driven by the rotor axial impeller sections to flow into the rotor centrifugal impeller sections, and is then thrown at a high speed by the rotor centrifugal impeller sections to the heat exchange component for efficient heat dissipation. In this way, the coolant may perform heat exchange at a high speed within the closed loop.

An expander-compressor system comprising an expander, a compressor and a shaft located in a casing which mechanically couples the expander and the compressor; the expander-compressor system comprises further a magnetic bearing which is positioned inside the casing and is arranged to act on the shaft. The magnetic bearing is cooled by a cooling fluid circuit arranged in a closed-loop configuration in order to avoid the release of cooling fluid to the environment and reduce the amount of cooling fluid required for cooling the one magnetic bearing. The expander-compressor system comprises further at least one dry gas seal arranged at the casing around a first end of the shaft and/or a second end of the shaft in order to avoid leakage of process gas to the cooling fluid circuit at the shaft. The cooling fluid circuit comprises pump or a blower, that may be internal and/or external to the casing.

Layered barrier cans and methods of producing the same are disclosed herein. An example shroud disclosed herein includes an inner shell including a first non-metallic material, an outer shell including the first non-metallic material or a second non-metallic material, and a metal core shell positioned between the inner shell and the outer shell.

Methods, systems, and apparatus are disclosed to provide a pressurized fluid to components of a fluid pump. An example flow control system to provide a pressurized lubricant to a secondary flow network disposed within a fluid pump includes sensors to measure parameters of a fluid corresponding to fluid flow; a recirculation loop fluidly coupled to a secondary inlet of the pump, the recirculation loop to provide a first flowpath, wherein the secondary inlet is an inlet to the secondary flow network; a bypass circuit fluidly coupled to the secondary inlet to provide a second flowpath; and a controller to direct the fluid flow to the first flowpath or the second flowpath based on sensor data from the sensor, the sensor data indicative of a state of the fluid.