US Pat. No. 9,440,895

ISOBARIC PRESSURE EXCHANGER CONTROLS IN AMINE GAS PROCESSING

ENERGY RECOVERY, INC., S...

1. A system, comprising:
an amine gas processing controller, comprising:
one or more tangible, non-transitory, machine-readable media collectively storing one or more sets of instructions; and
one or more processing devices configured to execute the one or more sets of instructions to:
transfer a rich amine stream from a contactor to a regenerator using an isobaric pressure exchanger (IPX); and
transfer a lean amine stream from the regenerator to the contactor using the IPX;
wherein the IPX transfers pressure energy from the rich amine stream to the lean amine stream.

US Pat. No. 9,341,396

RETRO-FIT ENERGY EXCHANGE SYSTEM FOR TRANSPARENT INCORPORATION INTO A PLURALITY OF EXISTING ENERGY TRANSFER SYSTEMS

ENERGY RECOVERY SYSTEMS I...

1. A retrofit energy exchange system for retrofit installation between an existing first energy transfer sub-system and an
existing second energy transfer sub-system, the retrofit energy exchange system comprising:
a first set of valves for connecting to a first set of connection points of said existing first energy transfer sub-system;
said existing first energy transfer sub-system having an excess supply of energy available at said first set of connection
points; said existing first energy transfer system connected a first controller; said first controller configured to receive
at least one first input for providing data to said first controller; said first controller configured to send at least one
output to said existing first energy transfer sub-system for selectively instructing activation or deactivation of said existing
first energy transfer sub-system to thereby generate said excess supply of energy; said first controller having a first passive
connection point configured to output a first set data received from said at least one first input;

a second set of valves for connecting to a second set of connection points of said existing second energy transfer sub-system;
said existing second energy transfer sub-system having a demand for energy at said second set of connection points; said existing
second energy transfer system connected a second controller; said second controller configured to receive at least one second
input for providing data to said second controller; said second controller configured to send at least one output to said
existing second energy transfer sub-system for selectively instructing activation or deactivation of said existing second
energy transfer sub-system to thereby realize said demand for energy; said second controller having a second passive connection
point to output a second set of data received from said at least one second input; and

an energy exchange unit connectable to said first set of valves via a first set of conduits; said energy exchange unit connectable
to said second set of valves via a second set of conduits; an energy exchange unit controller connectable to said existing
first energy transfer sub-system and said existing second energy transfer sub-system to receive said at least one first input
and said at least one second input; said energy exchange unit controller configured to activate said energy exchange unit
when said energy exchange unit controller determines, based on said at least one first input and said at least one second
input, that a present excess supply of energy from said existing first energy transfer system is available to satisfy a present
demand for energy at said existing second energy transfer sub-system.

US Pat. No. 9,879,513

SYSTEM AND METHOD OF PRODUCING OIL

PRECISION COMBUSTION, INC...

8. A method of producing oil from a heavy oil reservoir having a well, the method comprising:
supplying air, water and fuel to a steam generator;
dividing the supplied air into a first portion and a second portion in a mixer portion of the steam generator by flowing the
first portion of air through a plurality of openings disposed about a periphery of a conduit while flowing the second portion
of air external to the conduit;

mixing the second portion with the supplied fuel to form a fuel-air mixture;
flowing the first portion of air through reactor tubes, the reactor tubes having an oxidation catalyst on an outer surface;
flowing the fuel-air mixture over the outer surface of the reactor tubes;
mixing the first portion of air and the fuel-air mixture prior to and spaced apart from a combustor;
burning in a combustor the mixed first portion of air and the fuel-air mixture to produce combustion gases;
directing the combustion gases into a steam generator;
flowing the water through a conduit thermally connected to the combustor and steam generator;
spraying water onto the combustion gases to form steam, the water being at least partially sprayed in a direction towards
the combustor; and

directing the steam and the combustion gases into an oil reservoir.

US Pat. No. 9,945,216

FRAC SYSTEM WITH HYDRAULIC ENERGY TRANSFER SYSTEM

ENERGY RECOVERY, INC., S...

1. A system, comprising:a frac system, comprising:
a high-pressure pump configured to pump a first fluid that is substantially proppant free;
a low-pressure pump configured to pump a second fluid containing a proppant;
a hydraulic energy transfer system configured to block the flow of the second fluid through the high-pressure pump while exchanging pressure between the first fluid and the second fluid, wherein the hydraulic energy transfer system comprises a rotary isobaric pressure exchanger; and
a bypass valve when in an open position is configured to redirect the second fluid through the high-pressure pump and when in a closed position is configured to block the second fluid from flowing through the high-pressure pump.

US Pat. No. 9,500,394

RETRO-FIT ENERGY EXCHANGE SYSTEM FOR TRANSPARENT INCORPORATION INTO A PLURALITY OF EXISTING ENERGY TRANSFER SYSTEMS

ENERGY RECOVERY SYSTEMS I...

1. A retrofit energy exchange system comprising:
a first connection to a self-contained pre-existing first energy transfer sub-system for removing energy from a living space;
said first energy transfer sub-system having a potential excess supply of energy available at said first connection as a result
of removing energy;

a second connection to a self-contained pre-existing second energy transfer sub-system for providing energy to a living space;
said second energy transfer sub-system having a potential demand for energy;

an energy exchange unit connectable to said first connection to receive said potential excess supply of energy;
said energy exchange unit connectable to said second connection to supply said potential excess supply of energy, wherein
said energy exchange unit pumps said potential excess supply of energy from said first connection to said second connection;

an energy exchange unit controller connectable to receive an input from at least one of said first energy transfer sub-system
and said second energy transfer sub-system;

said energy exchange unit controller configured to activate said energy exchange unit when said energy exchange unit controller
determines from said input, that a present excess supply of energy from said first energy transfer sub-system is available
to satisfy at least a portion of a present demand for energy at said second energy transfer sub-system such that any removal
of energy or any supply of energy is provided, at least in part, via said energy exchange unit;

said energy exchange unit controller configured to deactivate said energy exchange unit when said energy exchange unit controller
determines from said input, said energy exchange unit is unable to satisfy at least a portion of a present demand for energy
at said second energy transfer sub-system such that any removal of energy is performed solely by said pre-existing first energy
transfer sub-system and any supply of energy is performed solely by said pre-existing second energy transfer sub-system.

US Pat. No. 9,764,272

SYSTEMS AND METHODS FOR UTILIZING TURBINE SYSTEMS WITHIN GAS PROCESSING SYSTEMS

ENERGY RECOVERY, INC., S...

1. A system, comprising:
a solvent gas processing system, comprising:
a high pressure reaction vessel configured to remove an acid gas from an untreated feed gas using a solvent in a lean solvent
fluid stream, wherein the high pressure reaction vessel is configured to output a treated clean gas and a first flow of a
high pressure fluid stream via a first flow path;

a turbine having a main nozzle, an auxiliary nozzle, and an outlet, wherein the main nozzle is configured to receive a second
flow of the high pressure fluid stream from the first flow path via a main flow path, and wherein the second flow of the high
pressure fluid stream is a portion of the first flow, and wherein the high pressure fluid stream is configured to drive the
turbine;

an auxiliary nozzle valve disposed along an auxiliary flow path, wherein the auxiliary nozzle valve is configured to control
a third flow of the high pressure fluid stream into the auxiliary nozzle of the turbine, and wherein the third flow of the
high pressure fluid stream is a portion of the first flow;

a first throttle valve disposed along an outlet flow path, wherein the first throttle valve is configured to control a fourth
flow of a low pressure fluid stream out of the outlet; and

a bypass valve disposed along a bypass flow path, wherein the bypass flow path routes a portion of the high pressure fluid
stream from the first flow path directly to the outlet flow path.

US Pat. No. 9,618,214

ENERGY EXCHANGE SYSTEM AND METHOD

ENERGY RECOVERY SYSTEMS I...

1. A system for heating water, the system comprising:
a first refrigerant circuit having a first refrigerant;
a first compressor within the first refrigerant circuit, the first compressor for compressing the first refrigerant;
a first condenser within the first refrigerant circuit, the first condenser configured to receive a water flow and to transfer
heat to the water flow at a first heat transfer rate to output the water flow at a first temperature;

a second refrigerant circuit isolated from the first refrigerant circuit, the second refrigerant circuit having a second refrigerant;
a second compressor within the second refrigerant circuit, the second compressor for compressing the second refrigerant, wherein
the second compressor is different from the first compressor, wherein the second compressor compresses the second refrigerant
to a higher pressure than the first compressor compresses the first refrigerant; and

a second condenser within the second refrigerant circuit and in fluid communication with the first condenser, the second condenser
configured to receive the water flow from the first condenser and to transfer heat to the water flow at a second heat transfer
rate to output the water flow at a second temperature.

US Pat. No. 9,234,686

USER CONTROL INTERFACE FOR HEAT TRANSFER SYSTEM

ENERGY RECOVERY SYSTEMS I...

1. A heat transfer system comprising:
a compressor for circulating a working fluid, the compressor having an inlet and an outlet, the compressor operable at a controllable
operating capacity;

a condenser connected to the outlet of the compressor, the condenser configured to receive flow of water to be heated;
an electrically controlled valve positioned to receive the working fluid from the outlet of the condenser;
an evaporator connected between an outlet of the electrically controlled valve and the inlet of the compressor, the evaporator
configured to receive flow of waste-heat bearing fluid;

pressure and temperature sensors positioned to measure pressures and temperatures of the heat transfer system; and
a controller connected to the pressure and temperature sensors, the electrically controlled valve, and the compressor, the
controller configured to control the heat transfer system according to one or more of compressor suction superheat, compressor
discharge superheat, compressor suction pressure, compressor discharge pressure, and water temperature, the controller including
a touchscreen configured to display a user control interface configured to display one of a first view, a second view and
a third view based on a permissions database defining different types of users,

wherein the different types of users include an operator user type having permission to access the first view, a superintendant
user type having permission to access the second view, and a manufacturer user type having permission to access the third
view:

the first view including a compressor capacity graph, a hot water temperature output field to display a current hot water
temperature, and a hot water input field to adjust a hot water set point;

the second view including the compressor capacity graph, a compressor suction superheat graph, a compressor discharge superheat
graph, the hot water temperature output field, a compressor inlet temperature output field, a compressor outlet temperature
output field, and a first plurality input fields to adjust the hot water set point, a suction superheat setpoint, a minimum
discharge superheat temperature, and a maximum suction pressure; and

the third view including the compressor capacity graph, the compressor suction superheat graph, the compressor discharge superheat
graph, the hot water temperature output field, the compressor inlet temperature output field, the compressor outlet temperature
output field, error code output fields, and a second plurality input fields to adjust the hot water set point, the suction
superheat setpoint, the minimum discharge superheat temperature, the maximum suction pressure, and a plurality of control
loop parameters (PID) to control a suction superheat control loop, a discharge superheat control loop, and a suction pressure
control loop.

US Pat. No. 9,695,795

PRESSURE EXCHANGE NOISE REDUCTION

Energy Recovery, Inc., S...

1. An energy recovery apparatus comprising:
a rotor including a duct and configured to move the duct and low pressure fluid in the duct to a first position, and to move
the duct and high pressure fluid in the duct to a second position;

a high pressure input port disposed in a first end cover, the high pressure input port configured to admit high pressure fluid
for compressing low pressure fluid and displacing compressed fluid while the rotor is in the first position;

a high pressure output port disposed in a second end cover, the high pressure output port configured to release compressed
fluid while the rotor is in the first position;

a low pressure output port disposed in the first end cover, the low pressure output port configured to release decompressed
high pressure fluid from the duct at low pressure while the duct is at the second position;

a low pressure input port disposed in the second end cover, the low pressure input port configured to admit low pressure fluid
into the duct to displace decompressed fluid while the duct is at the second position;

a first high pressure seal surface in the second end cover and adjacent the low pressure input port; and
a first groove disposed on a first outer surface of the second end cover and between the first high pressure seal surface
and the low pressure input port, the first groove configured to release pressure and decompress high pressure fluid in the
duct as the rotor moves the duct over the first groove and into alignment with the low pressure input port, wherein the first
groove extends through only a portion of the first outer surface of the second end cover such that an innermost surface of
the first groove forms at least a portion of the first outer surface of the second end cover; and

a second high pressure seal surface in the first end cover and adjacent the low pressure output port.

US Pat. No. 9,604,889

ISOBARIC PRESSURE EXCHANGER IN AMINE GAS PROCESSING

ENERGY RECOVERY, INC., S...

1. A system, comprising:
an amine gas processing system, comprising:
a contactor configured to remove an acid gas from an untreated natural gas using an amine in a lean amine stream, output a
treated natural gas, and output a rich amine stream;

a regenerator configured to regenerate the amine in the rich amine stream, output the lean amine stream, and output the acid
gas; and

an isobaric pressure exchanger configured to transfer the rich amine stream from the contactor to the regenerator and to transfer
the lean amine stream from the regenerator to the contactor, wherein the isobaric pressure exchanger is configured to transfer
pressure from the rich amine stream entering the isobaric pressure exchanger at a first pressure to the lean amine stream
leaving the isobaric pressure exchanger at a second pressure, wherein the first pressure is greater than the second pressure.

US Pat. No. 9,885,372

SYSTEM AND METHOD FOR A ROTOR ADVANCING TOOL

ENERGY RECOVERY, INC., S...

1. A system, comprising:
an isobaric pressure exchanger (IPX) comprising:
a housing, wherein the housing comprises a body portion and first and second manifolds disposed at opposite ends of the body
portion;

a rotor disposed within the housing; and
a sleeve disposed about the rotor between the body portion and the first and second manifolds; anda rotor advancing tool configured to engage and to move the rotor while the rotor is within the housing;
wherein the housing comprises an opening that enables the rotor advancing tool to extend through the opening to engage and
to move the rotor, wherein the opening is disposed on the body portion, and wherein the sleeve comprises a sleeve opening
radially aligned relative to a longitudinal axis of the IPX with the opening of the housing, and the sleeve opening enables
the rotor advancing tool to extend through the sleeve to engage and to move the rotor.

US Pat. No. 9,835,018

ROTARY ISOBARIC PRESSURE EXCHANGER SYSTEM WITH LUBRICATION SYSTEM

Energy Recovery, Inc., S...

1. A system, comprising:
a frac system, comprising:
a rotary isobaric pressure exchanger configured to exchange pressures between a first fluid and a second fluid; and
a lubrication system configured to lubricate the rotary isobaric pressure exchanger, wherein the lubrication system comprises
a pump configured to pump a third fluid into the rotary isobaric pressure exchanger to lubricate the rotary isobaric pressure
exchanger.

US Pat. No. 9,683,574

DEBRIS RESISTANT THRUST BEARING ASSEMBLY FOR HIGH SPEED HYDRAULIC CENTRIFUGAL TURBINES AND PUMPS

ENERGY RECOVERY, INC., S...

1. A bearing assembly configured for use in turbines and pumps, the bearing assembly comprising:
a shroud that is configured to rotate around a central axis;
at least one blade housed within the shroud;
a disk seated in a recess in the shroud so that the disk is configured to rotate with the shroud, the disk being oriented
perpendicular to the central axis; and

a stationary element that contacts the disk on a face opposite the shroud, wherein a fluid is configured to flow between the
stationary element and the disk so that when the disk rotates, the disk resists the generation of drag between the face of
the disk and the stationary element of the bearing assembly.

US Pat. No. 10,072,675

SYSTEM FOR USING PRESSURE EXCHANGER IN DUAL GRADIENT DRILLING APPLICATION

ENERGY RECOVERY, LLC, Sa...

1. A system, comprising:a mud return system, comprising:
a pressure exchanger (PX) configured to be installed in a body of water, to receive used drilling mud, to receive a second fluid, to utilize the second fluid to pressurize the drilling mud for transport, via a mud return line, from a first location at or near a floor of the body of water to a second location at or near a surface of the body of water, wherein the drilling mud and the second fluid contact one another at an interface within the PX, and wherein the second fluid is a pressurized energizing fluid received from a vessel at or near the surface of the body of water.

US Pat. No. 9,739,128

ROTARY ISOBARIC PRESSURE EXCHANGER SYSTEM WITH FLUSH SYSTEM

ENERGY RECOVERY, INC., S...

1. A system, comprising:
a frac system, comprising:
a hydraulic energy transfer system configured to exchange pressures between a first fluid and a second fluid, wherein the
hydraulic energy transfer system comprises a rotary isobaric pressure exchanger comprising a rotor, a sleeve surrounding the
rotor, a first end cap, and a second end cap; and

a flush system configured to remove particulate out of the hydraulic energy transfer system, the flush system is configured
to pump a third fluid into a gap between the sleeve and the rotor.

US Pat. No. 10,167,712

ROTARY ISOBARIC PRESSURE EXCHANGER SYSTEM WITH FLUSH SYSTEM

ENERGY RECOVERY, INC., S...

1. A system, comprising:a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and a second fluid, wherein the rotary IPX comprises a rotor, a sleeve surrounding the rotor, a first end cap, and a second end cap; and
a flush system configured to remove particulate out of the rotary IPX, the flush system is configured to pump a third fluid into a gap between the sleeve and the rotor.

US Pat. No. 9,759,054

SYSTEM AND METHOD FOR UTILIZING INTEGRATED PRESSURE EXCHANGE MANIFOLD IN HYDRAULIC FRACTURING

ENERGY RECOVERY, INC., S...

1. A system, comprising:
an integrated manifold system, comprising:
a plurality of isobaric pressure exchangers (IPXs), wherein each IPX of the plurality of IPXs comprises a low-pressure first
fluid inlet configured to receive a low-pressure first fluid, a high-pressure second fluid inlet configured to receive a high-pressure
second fluid, a high-pressure first fluid outlet configured to discharge a high-pressure first fluid, and a low-pressure second
fluid outlet configured to discharge a low-pressure second fluid;

a low-pressure first fluid manifold coupled to each of the low-pressure first fluid inlets of the plurality of IPXs and configured
to provide the low-pressure first fluid to each of the low-pressure first fluid inlets of the plurality of IPXs;

a high-pressure second fluid manifold coupled to each of the high-pressure second fluid inlets of the plurality of IPXs and
configured to provide the high-pressure second fluid to each of the high-pressure second fluid inlets of the plurality of
IPXs;

a high-pressure first fluid manifold coupled to each of the high-pressure first fluid outlets of the plurality of IPXs and
configured to discharge the high-pressure first fluid from the integrated manifold system; and

a low-pressure second fluid manifold coupled to each of the low-pressure second fluid outlets of the plurality of IPXs and
configured to discharge the low-pressure second fluid from the integrated manifold system;

wherein the first fluid comprises a fracing fluid having proppants, and the system comprises a blender coupled to the low-pressure
first fluid manifold and configured to produce the fracing fluid, and wherein the blender is coupled to a fluid conduit configured
to divert at least a portion of the low-pressure second fluid discharged from the low-pressure second fluid manifold to the
blender.

US Pat. No. 9,970,281

SYSTEM AND METHOD FOR OFFSHORE (TOPSIDE OR SUBSEA) AND ONSHORE WATER REINJECTION FOR SECONDARY RECOVERY

ENERGY RECOVERY, INC., S...

1. A system, comprising:a fluid injection system, comprising:
a rotary isobaric pressure exchanger (IPX) configured to receive a first fluid, to directly receive a second fluid extracted from a source well, to utilize the second fluid to pressurize the first fluid for injection into an injection well, and to inject the pressurized first fluid into the injection well; and
a high pressure source fluid flow path extending directly from the source well to the rotary IPX, wherein the high pressure source fluid flow path is configured to divert the second fluid directly from the source well to the rotary IPX.

US Pat. No. 9,975,789

SYSTEM AND METHOD FOR OFFSHORE (TOPSIDE OR SUBSEA) AND ONSHORE WATER REINJECTION FOR SECONDARY RECOVERY

ENERGY RECOVERY, INC., S...

1. A system, comprising:a fluid transportation system configured to transport oil, comprising:
a separator configured to separate a multi-phase fluid extracted from a source well into a plurality of components, wherein the plurality of components comprises at least the oil;
a rotary isobaric pressure exchanger (IPX) configured to receive the oil from the separator, to receive the multi-phase fluid extracted from the source well, to utilize the multi-phase fluid to pressurize the oil to enable transport of the oil from the rotary IPX to a designated location;
wherein the oil is derived from the multi-phase fluid by the separator subsequent to the multi-phase fluid passing through the rotary IPX.

US Pat. No. 9,945,210

PRESSURE EXCHANGER SYSTEM WITH INTEGRAL PRESSURE BALANCING SYSTEM

Energy Recovery, Inc., S...

1. A system comprising:a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and second fluid, wherein the rotary IPX comprises:
a first end cover comprising a first fluid aperture configured to route the first fluid;
a first piston integral with the first end cover, wherein the first piston defines a first hydraulic path configured to route the first fluid to or from the first fluid aperture, and wherein the first piston comprises a wing that extends radially outward from and about a portion of a body of the first piston, wherein the portion is less than the entire circumference of the body;
a second end cover comprising a second fluid aperture configured to route the second fluid; and
a second piston integral with the second end cover, wherein the second piston comprises a second hydraulic path configured to route the second fluid to or from the second fluid aperture.

US Pat. No. 9,920,774

PRESSURE EXCHANGE SYSTEM WITH MOTOR SYSTEM AND PRESSURE COMPENSATION SYSTEM

ENERGY RECOVERY, INC., S...

1. A system, comprising:
a hydraulic energy transfer system configured to exchange pressures between a first fluid and a second fluid;
a motor system configured to power the hydraulic energy transfer system, wherein motor system comprises a casing, a motor
disposed in the casing, and a dielectric fluid disposed in the casing;

a shaft coupling the motor system and the hydraulic energy transfer system;
a shaft seal disposed about the shaft;
a pressure compensator configured to reduce a pressure differential across the shaft seal, wherein the pressure compensator
comprises:

a first chamber in hydraulic communication with the first fluid;
a second chamber in hydraulic communication with the dielectric fluid; and
a hydraulic barrier disposed between the first and second chambers, wherein the hydraulic barrier is configured to separate
the first fluid in the first chamber and the dielectric fluid in the second chamber and configured to balance a first pressure
of the first fluid in the first chamber with a second pressure of the dielectric fluid in the second chamber; and

a fluid passageway in hydraulic communication with the dielectric fluid disposed in the casing of the motor system and the
second chamber, wherein the second fluid passageway directly supplies the dielectric fluid to the second chamber from an interior
of the casing.

US Pat. No. 9,976,573

SYSTEM AND METHOD FOR IMPROVED DUCT PRESSURE TRANSFER IN PRESSURE EXCHANGE SYSTEM

ENERGY RECOVERY, INC., S...

1. A rotary isobaric pressure exchanger (IPX) for transferring pressure energy from a high pressure first fluid to a low pressure second fluid, comprising:a cylindrical rotor configured to rotate circumferentially about a rotational axis and having a first end face and a second end face disposed opposite each other with a plurality of channels extending axially therethrough between respective apertures located in the first and second end faces;
a first end cover having a first surface that interfaces with and slidingly and sealingly engages the first end face, wherein the first end cover has at least one first fluid inlet and at least one first fluid outlet that during rotation of the cylindrical rotor about the rotational axis alternately fluidly communicate with at least one channel of the plurality of channels;
a second end cover having a second surface that interfaces with and slidingly and sealingly engages the second end face, wherein the second end cover has at least one second fluid inlet and at least one second fluid outlet that during rotation of the cylindrical rotor about the rotational axis alternately fluidly communicate with at least one channel of the plurality of channels; and
a port disposed through the first surface of the first end cover or through the second surface of the second end cover and extending to an outermost radial side wall of the first end cover or the second end cover, wherein during rotation of the cylindrical rotor about the rotational axis the port is configured to fluidly communicate with at least one channel of the plurality of channels within the rotor, and wherein the port comprises a compound angle.

US Pat. No. 10,119,379

PRESSURE EXCHANGE SYSTEM WITH MOTOR SYSTEM

ENERGY RECOVERY, San Lea...

1. A system, comprising:a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and a second fluid, wherein the rotary IPX comprises a rotor, the rotor comprises ducts extending longitudinally through the rotor, and the first fluid and the second fluid directly contact each other within a respective duct to exchange pressures, wherein the first fluid is a substantially particulate free fluid and the second fluid is a particulate laden fluid: and
an electric motor coupled to the rotary IPX and configured to power the rotary IPX, wherein the electric motor comprises first permanent magnets or first electromagnets within the rotor of the rotary IPX configured to interact with second permanent magnets or second electromagnets.

US Pat. No. 10,138,907

ROTARY ENERGY RECOVERY DEVICE

Energy Recovery, Inc., S...

1. A system comprising:a rotor disposed in a rotary energy recovery device and comprising:
a plurality of blades circumferentially spaced apart and each blade of the plurality of blades having a respective longitudinal length extending from a first longitudinal end to a second longitudinal end and a respective radial width extending from the first longitudinal end to the second longitudinal end, wherein each blade of the plurality of blades comprises a first wall having a first face and a second face that is substantially opposite the first face in a circumferential direction relative to the respective longitudinal length, wherein the first face has a curved surface extending the respective longitudinal length from the first longitudinal end to the second longitudinal end and the second face has a substantially flat surface extending the respective longitudinal length and the respective radial width from the first longitudinal end to the second longitudinal end;
a plurality of channels that extend from a first end of the rotor to a second end of the rotor wherein at least one channel of the plurality of channels has a first radial cross-sectional area and a second radial cross-sectional area having a total area different from a total area of the first radial cross-sectional area relative to a longitudinal axis of the at least one channel of the plurality of channels, and wherein the at least one channel of the plurality of channels forms a low pressure region that creates torque to rotate the rotor using axial fluid flow through the rotor, wherein the at least one channel is disposed between the first face of a first blade of the plurality of blades and the second face of a second blade of the plurality of blades that is adjacent the first blade;
a housing in which the rotor rotates; and
first and second end covers in the housing comprising interior faces arranged in a sealing relationship with first and second rotor end faces.

US Pat. No. 10,139,116

BLENDED MEMBRANES FOR WATER VAPOR TRANSPORT AND METHODS FOR PREPARING SAME

CORE Energy Recovery Solu...

1. A water vapor transport membrane comprising a microporous substrate and an air impermeable selective layer coated on a first surface of the substrate to form a substantially non-porous film thereupon, the selective layer comprising sulfonated polyether ether ketone (sPEEK) and cellulose acetate (CA) in an sPEEK:CA (wt.:wt.) ratio in the ramie of about 7:3 to about 2:3, wherein the acetyl content of the CA is in the range of about 20% to about 62%, the degree of sulfonation of the sPEEK is in the ramie of about 23% to about 100%, and the selective layer has a thickness of less than about 5 microns, wherein the sPEEK comprises sPEEK in a cation form.

US Pat. No. 10,167,710

PRESSURE EXCHANGE SYSTEM WITH MOTOR SYSTEM

Energy Recovery, Inc., S...

1. A frac system, comprising:a hydraulic energy transfer system configured to exchange pressures between a first fluid and a second fluid, the hydraulic energy transfer system comprises:
a housing;
a rotor within the housing and configured to exchange the pressures between the first fluid and the second fluid;
a sleeve within the housing wherein the rotor is configured to rotate within the sleeve; and
an electric motor system coupled to the hydraulic energy transfer system and configured to rotate the rotor, the electric motor system comprises:
a first magnet within the sleeve; and
a second magnet within the rotor, wherein interaction between the first magnet and the second magnet are configured to rotate the rotor.