Abstract: An exhaust heat recovery apparatus includes: a housing having a first exhaust passage and a second exhaust passage, an exhaust inlet fitting, and an exhaust outlet fitting; a heat exchanger disposed in the first exhaust passage; and a switching valve having a slide gate which is movable in a longitudinal direction of the housing so as to allow a flow of exhaust gases to be switched between the first exhaust passage and the second exhaust passage, wherein the first exhaust passage is parallel to the second exhaust passage, and the slide gate is movable between the first exhaust passage and the second exhaust passage.

Abstract: An electric oil pump system integrated with a heat exchanger capable of reducing installation space and cost may include: an the electric oil pump including a motor and a pumping part operated by power of the motor to suck and send oil under pressurizing to an oil-used part; and a heat exchanger to exchange heat between the pressurized oil sent by the electric oil pump and coolant cooled at a radiator while the coolant and the pressurized oil pass through the heat exchanger. In particular, the heat exchanger is directly coupled to the electric oil pump and the oil-used part, respectively, and integrated with each other.

Abstract: An electric oil pump system allows the cooling of an electric oil pump (EOP) and an oil pump controller (OPU) to be performed efficiently in the vehicle equipped with the electric oil pump. An electric oil pump of the system includes a pumping part that is operated by power of a motor to suction and direct pressurized oil. An oil pump controller operates the electric oil pump. A water-cooled cooling apparatus cools the oil pump controller using coolant and an oil-cooled cooling apparatus cools the electric oil pump using oil. The coolant of the water-cooled cooling apparatus and the oil of the oil-cooled cooling apparatus pass through a heat exchanger and as the coolant and oil pass therethrough, heat exchange is achieved.

Abstract: A header tank of a heat exchanger. The header tank includes a housing defining a coolant chamber through which coolant flows. The header tank further includes a flow control member, which extends into the coolant chamber. The flow control member is configured to advantageously reduce swirling of coolant in the coolant chamber, reduce velocity of coolant in the coolant chamber, and reduce liquid pressure drop of the heat exchanger.

Abstract: A thermal management device for use in a vehicular or other thermal management circuit utilizes a pump, one or more valves, and one or more pressure/temperature sensors to route coolant through different desired flow paths and maintain components within the thermal circuit at appropriate temperatures.

Abstract: The heat exchange system is for heating water from a water source and comprises first and second flooded heat exchangers that have steam sides that are each independently fed with steam, but water sides that are serially fed with water through the first heat exchanger then through the second heat exchanger. The system also comprises first and second control valves located at or downstream of subcooled condensate outlets of the first and second heat exchangers, first and second water temperature sensors at or downstream of the heated water outlets of the first and second heat exchangers, and a control device for receiving temperature data from the first and second water temperature sensors and for controlling the first and second control valves.

Abstract: A cooling structure for a rotary electric machine includes a first supply pipe that is disposed vertically above a rotary electric machine and that has a discharge hole through which a refrigerant is discharged toward the rotary electric machine; a second supply pipe that is disposed in parallel with the first supply pipe vertically above the rotary electric machine and that has a discharge hole through which the refrigerant is discharged toward the rotary electric machine; and a pump configured to deliver the refrigerant to the first supply pipe and the second supply pipe such that a direction of the refrigerant flowing through the first supply pipe and a direction of the refrigerant flowing through the second supply pipe are opposite to each other.

Abstract: A fuel-oil heat exchange system for an engine having a first fuel line for delivery of fuel to an engine combustor and a second fuel line for delivery of fuel to ancillary engine equipment. The heat exchange system has a first heat exchanger for transfer of heat from an engine oil system to the first fuel line and a second heat exchanger for transfer of heat from the engine oil system to the second fuel line. A control valve is provided for selective control of the oil flow from the engine oil system to the first and second heat exchangers.

Abstract: A compound engine assembly for use as an auxiliary power unit for an aircraft and including an engine core with internal combustion engine(s), a compressor having an outlet in fluid communication with an engine core inlet, a bleed conduit in fluid communication with the compressor outlet through a bleed air valve, and a turbine section having an inlet in fluid communication with the engine core outlet and configured to compound power with the engine core. The turbine section may include a first stage turbine having an inlet in fluid communication with the engine core outlet and a second stage turbine having an inlet in fluid communication the first stage turbine outlet. A method of providing compressed air and electrical power to an aircraft is also discussed.

Abstract: Disclosed is a transmission oil bypass assembly including: a body formed in a pipe shape such that a first longitudinal side of the body is inserted into a first heat exchanger for heat exchange of transmission oil, with a bypass passage provided at a second longitudinal side of the body by protruding outside the first heat exchanger, and openings formed on a side wall of the body to allow the transmission oil to be introduced therethrough; a returning pipe configured to return the transmission oil introduced through the body to the transmission; a thermal expansion unit inserted into the body; a returning-side on/off valve configured to close an internal passage of the returning pipe when a length of the thermal expansion unit is increased; and a bypass-side on/off valve configured to close the bypass passage when the length of the thermal expansion unit is decreased.

Abstract: A device for controlling the temperature of cooling water includes a three-way valve having a first inlet, a second inlet, and an outlet; a first feed pipe; a second feed pipe; and a return pipe for connecting between an outlet of the temperature-control target and an inlet of the cooling water supply unit. The device also includes a return-side bypass pipe for connecting between the return pipe and the second inlet of the three-way valve; a pump provided on the second feed pipe for circulating the cooling water between the three-way valve and the temperature-control target; and a temperature measuring unit for measuring a temperature of the cooling water flowing in the second feed pipe. In addition, the device includes a controller for controlling the three-way valve and the pump in accordance with a detection result of the temperature measuring unit.

Abstract: A can-type heat exchanger may include a housing having a space therein, integrally formed with a mounting portion, and a first inlet and a first outlet; a partition wall integrally formed to the housing, separating the space and the inside of the mounting portion, and forming a bypass passageway inside of the housing; a heat radiating unit inserted into the space, provided with connecting lines alternately formed by stacking a plurality of plates; a cover cap mounted at opened one surface of the housing, and a second inlet and a second outlet for communicating a second connecting line of the connecting lines; and a valve unit mounted at the first inlet formed in the mounting portion and penetrating the partition wall in the mounting portion, selectively opening and closing the space or the bypass passageway separated by the partition wall using linear displacement.

Abstract: An exhaust heat recovery apparatus may include a bypass valve that is rotatably provided on a bypass path through which a high-temperature exhaust gas passes to open or close the bypass path, a heat exchanger that is communicatively connected to the bypass path to allow heat exchange to be performed between the high-temperature exhaust gas supplied from the bypass path and a low-temperature coolant introduced through a coolant inlet when the bypass path is closed, a valve actuator including a rod moved up and down by expansion or contraction of a wax sealed therein, and a connection part that converts an up and down motion of the rod into a rotary motion to allow the bypass valve to open or close the bypass path along with movement of the rod.

Abstract: A radiator cap is connected to a circulating circuit at a connecting point located upstream of a water pump in a flow direction of coolant and that regulates a pressure in the circulating circuit to be within a predetermined pressure range that is higher than or equal to an atmospheric pressure at the connecting point. A rotary valve is disposed in the circulating circuit at upstream of the connecting point of the radiator cap in the flow direction of coolant. Accordingly, a cavitation is restricted from occurring, and the water pump can perform enough efficiency. A communication passage that has an upstream end and a downstream end connected to the circulating circuit may be disposed instead of the radiator cap. In this case, a pressure regulating valve is disposed in the communication passage.

Abstract: A decongealing channel for use in a heat exchanger apparatus, including a supersaturated solution contained therein and an actuation component in fluid communication with a lubricating fluid coupled to the decongealing channel. The actuation component is responsive to a change in pressure exerted thereon by the lubricating fluid so as to actuate an exothermic response in the supersaturated solution. The heat exchanger apparatus is disposed in a bypass fan duct of an aircraft engine. The heat exchanger apparatus including a manifold portion, one or more flow through openings extending therethrough the manifold portion to define one or more flow through channels having contained therein the lubricating fluid. In addition, the manifold portion including one or more additional openings extending therethrough to define one or more decongealing channels. Further disclosed is an engine including the heat exchanger apparatus and a method of decongealing a lubricating fluid in the heat exchanger apparatus.

Abstract: In a magnet temperature estimating method, in the event that a rotor of a rotary electric machine is cooled by a cooling oil, a magnet temperature calculator estimates the magnet temperature of magnets provided on the rotor, based on losses of the rotary electric machine including a loss of the rotor and the temperature of the cooling oil.

Abstract: An air-conditioner for a vehicle includes: a heater core which heats air for air-conditioning by using cooling water of a cooling circuit which cools a fuel cell of a fuel cell vehicle or an engine of a hybrid car as a heat source; a heat exchanger arranged upstream of the heater core in a flow of the air for air-conditioning to heat the air for air-conditioning by using refrigerant which flows through a heat pump cycle as a heat source; and a control part which controls operation of the heat pump cycle in a manner that a target temperature of the air for air-conditioning heated by the heat exchanger is changed in accordance with a temperature of the cooling water.

Abstract: A heat exchanger apparatus containing a heat exchanger, a fitting at the fluid inlet and a thermally actuated bypass valve positioned in a fluid inlet manifold of the heat exchanger. The valve contains a sleeve having first and second slots, that permit fluid flow from a fluid inlet to a bypass or fluid inlet manifold. A drum positioned within the sleeve is movable from a first to a second position, and has an aperture that permits fluid flow to the first or second slot. An actuator engages the drum and actuates it to move from the first to the second position. The sleeve further contains a lip positioned between the fitting and a bypass channel cover plate for affixing the sleeve in position.

Abstract: A heat exchanger for a vehicle may include a heat radiating portion provided with first, second and third connecting lines and receiving first, second, and third operating fluids respectively and a bifurcating portion connecting one of inflow holes formed to the heat radiating portion for flowing one operating fluid of the first, second, and third operating fluids with one of exhaust holes formed to the heat radiating portion for exhausting the one operating fluid, wherein the bifurcating portion may be mounted at an exterior of the heat radiating portion, and wherein the bifurcating portion bypasses the one operating fluid from the heat radiating portion according to a temperature of the one operating fluid.

Abstract: An oil filter module (10) has a connection for a filter element (14) and an oil-coolant heat exchanger (12). Arranged in a housing (26, 42) is a bypass line (20) for bypassing the oil-coolant heat exchanger (12). The bypass line (20) has a valve chamber (22) with a thermostat unit (24). The thermostat unit (24) controls an oil flow through the bypass line (20) according to a temperature of the oil. The housing is made up at least of a valve housing part (26) and a heat exchanger housing part (42). The valve chamber (22) is arranged in the valve housing part (26). A base plate (40) of the heat exchanger housing part (42) closes the valve chamber (22) lengthwise.

Abstract: A heat exchanger may include a heat radiating portion provided with first, second, and third connecting lines formed in a predetermined sequence by stacking a plurality of plates, and receiving first, second, and third operating fluids respectively into the first, second, and third connecting lines, the first, second, and third operating fluids exchanging heat with each other while passing through the first, second, and third connecting lines and the first, second, and not being mixed with each other while being circulated, and a bifurcating portion connecting an inflow hole for flowing one operating fluid of the first, second, and third operating fluids with an exhaust hole for exhausting the one operating fluid, adapted for the one operating fluid to bypass the heat radiating portion according to a temperature of the one operating fluid, and mounted at an exterior of the heat radiating portion.

Abstract: A system for regulating the temperature and flow rate of a heat transfer fluid for use in a hybrid steam-generating plant is described. A bypass section may be incorporated into the piping network of a primary steam-generating source to route heat transfer fluid from a hot source to a mixer downstream of at least one heat exchanger. Heat transfer fluid from the hot source may be mixed with cooler heat transfer fluid exiting the heat exchanger in the event that the supply from a secondary steam-generating source is lost or becomes intermittent. The result is a system that maintains a constant flow rate of heat transfer fluid through the heat exchangers while minimizing adverse temperature gradient effects that may result from steam production variability and plant operation outside of design point parameters.

Abstract: A temperature control arrangement includes a heat exchanger which is fluidly connected via a transmission oil circuit to a transmission of the vehicle. A heat accumulator is fluidly connected to the transmission oil circuit and a control device is arranged in the transmission oil circuit. The control device subdivides the transmission oil circuit into an accumulator circuit containing the heat accumulator and a cooling circuit containing the heat exchanger. The heat accumulator alternately accumulates thermal energy from the transmission oil and delivers previously stored thermal energy to the transmission oil. The control device is configured to direct the transmission oil circulating within the transmission oil circuit at least partially to the heat exchanger and/or to the heat accumulator.

Abstract: A temperature equalization system, including an installation, a heat equalizer disposed in a natural heat carrier and being made of a material of heat conduction to exchange heat with the natural heat carrier, a fluid transmission duct disposed between the heat equalizer and the installation and having a fluid contained therein for heat transmission, a pump connected in series with the fluid transmission duct for pumping the fluid, and a control means controlling an operation of temperature equalization system. The control means controls the pump to pump the fluid through the fluid transmission duct and an interior of the installation.

Abstract: A temperature equalization system, including an installation, a heat equalizer disposed in a natural heat carrier and being made of a material of heat conduction to exchange heat with the natural heat carrier, a fluid transmission duct disposed between the heat equalizer and the installation and having a fluid contained therein for heat transmission, a pump connected in series with the fluid transmission duct for pumping the fluid, and a control means controlling an operation of temperature equalization system. The control means controls the pump to pump the fluid through the fluid transmission duct and an interior of the installation with a periodical change of flowing direction.

Abstract: Method of controlling a variable delivery pump fitted to a heating system comprising: a heat exchanger connected to two circuits of fluids, the variable delivery pump making it possible to vary the flow-rate of the first fluid inside the heat exchanger; a return loop on the primary circuit allowing the first fluid reaching the input of the heat exchanger to mix with a portion of the first fluid coming from the output of the exchanger; a first temperature sensor measuring a temperature of the second fluid coming from the secondary circuit; a second temperature sensor measuring a temperature of the first fluid coming from a primary circuit; a control unit electrically connected to the first and second temperature sensors, the sensors generating electrical signals as functions of the temperatures and constituting electrical input signals of the control unit.

Abstract: A powertrain cooling system includes a coolant pump and coolant flow passages. A first three-position valve is operatively connected with an outlet of the coolant pump and has a first, a second, and a third position to at least partially establish different coolant flow modes through the coolant flow passages. Coolant flow from the coolant pump is blocked from both the cylinder head and the engine block in a first coolant flow mode when the three-position valve is in the first position. Coolant flow from the coolant pump is provided to the cylinder head and is blocked from the engine block in a second coolant flow mode when the three-position valve is in the second position. Coolant flows from the coolant pump to the engine block and from the engine block to the cylinder head in a third coolant flow mode when the three-position valve is in the third position.

Abstract: A heat exchanger includes: a bypass valve; a stack of standard tubes; and, in the stack, a pair of stacked-together adapter tubes. Each standard tube end has spaced-apart walls including openings. Each adapter tube end has: a wall including an opening; and a passage. At one end of the pair, the passages communicate with one another and the openings communicate with the openings in adjacent standard tubes; at the other end, the openings communicate with the openings in adjacent standard tubes. The valve includes a plug with opposed plug walls, one plug wall having one of an inlet and outlet, the plug being disposed with its walls between and at said other end of the pair and with the inlet and outlet communicating with the passages. An actuator is adjacent to the plug and has a reciprocating plunger for selectively blocking at least said one of the inlet and outlet.

Abstract: An air treatment module includes an air plenum, a heat exchanger tube and a bypass duct. The bypass duct has an inlet opening in flow communication with the air plenum in juxtaposition with a selected region of the heat exchanger and an outlet opening in flow communication with a zone of lower air pressure. The presence of the bypass duct improves air flow over the heat exchanger tube in the selected region.

Abstract: A heat exchange device includes a thermoactuator usable over a long period of time is disclosed. The thermoactuator includes a case. In the case, there is formed a stopper providing an advancement limit of a rod to limit an opening degree of a valve of the thermoactuator.

Abstract: A temperature equalization system, including an installation, a heat equalizer disposed in a natural heat carrier and being made of a material of heat conduction, a relay heat equalizer, a first fluid transmission duct disposed between the relay heat equalizer and the installation and having a first fluid contained therein for heat transmission, a second fluid transmission duct disposed between the heat equalizer and the relay heat equalizer and having a second fluid contained therein for heat transmission, a pump and a relay pump respectively connected in series with the first and second fluid transmission ducts for pumping the first and second fluid, and a control means controlling the pump to pump the first fluid through the relay heat equalizer, the fluid transmission duct and an interior of the installation, and to pump the second fluid through the relay heat equalizer, the second fluid transmission duct and the heat equalizer.

Abstract: A heat exchanger arrangement is provided for an internal-combustion engine having a heat engine, which converts hot steam of a working medium by way of an expansion device to kinetic energy. The working medium, that can be delivered by a pump, can be heated in a first heat exchanger by a coolant and in a second heat exchanger by an exhaust gas of the internal-combustion engine. In the delivery direction, the working medium first flows through the first heat exchanger and, subsequently, through the second heat exchanger. The exhaust gas can flow through the first heat exchanger.

Abstract: A thermal module for use on a spacecraft to control thermal loads coming from a heat source is disclosed. The thermal module includes a two-phase loop system and a heat rejection system. The two-phase loop system includes a thermal collector, a heat flow regulator, a by-pass line, and a condenser. The condenser and the heat rejection system are thermally coupled, such that the heat flow regulator redirects part of the thermal loads from the heat source to the condenser, from which the heat rejection system directs said thermal loads to a heat sink. The temperature of the heat source is regulated by bypassing another part of the thermal loads back to the thermal collector through the by-pass line in a proportional manner, to avoid overcooling the heat source. The heat rejection system is designed based on the hottest possible conditions for the spacecraft mission.

Abstract: It is possible to realize flow rate control regardless of the scale on a load side or a piping system and to achieve energy saving. In a host control device (20) of a heat source system, a bypass valve opening command value is determined by an opening command value determination unit (22) such that a header differential pressure matches a target differential pressure value, and a target opening value according to the header differential pressure or the behavior of the bypass valve opening is set by a target opening value setting unit (24). A heating medium flow rate set value is determined by a heating medium flow rate setting unit (23) using the target opening value set by the target opening value setting unit (24) and the opening command value determined by the opening command value determination unit (22).

Abstract: A heat exchanger for a vehicle includes: a heat releasing unit that is stacked with a plurality of plates and that forms connection flow channels to intersect at the inside thereof to inject other working fluids and that exchanges a heat of working fluids that pass through the respective connection flow channels, a bypass unit that is formed in the heat releasing unit to form a plurality of inflow holes and exhaust holes that inject and exhaust the working fluids to the respective connection flow channels and that connects the inflow hole and the exhaust hole that is connected to one of the respective connection flow channels, and a valve unit that is mounted within the heat releasing unit to correspond to the inflow hole that forms the bypass unit and that is selectively opened or closed using a deformation force of bimetal that is deformed according to a temperature of a working fluid that is injected into the inside thereof to inject the working fluid into the heat releasing unit and the bypass unit.

Abstract: A valve can be incorporated as an integral part of the heat exchanger as a plug-in item that can be located anywhere desired between the inlet and outlet flow manifolds of the heat exchanger.

Abstract: Systems, methods, and apparatuses for controlling a thermal fluid condition may include monitoring a thermal fluid at an outlet of a heat exchanger. An outlet condition of the thermal fluid at the outlet of the heat exchanger can be determined. The outlet condition of the thermal fluid can be provided to a controller of a closed-loop thermal cycle. A condition of the thermal fluid at an inlet to the heat exchanger can be adjusted based on the outlet condition of the thermal fluid.

Abstract: A valve assembly includes a housing defining first, second, third, and fourth passages. The first passage channels relatively-high pressure fluid and the second passage channels relatively-low pressure fluid into the valve. The third passage connects to the second passage and releases fluid from the valve. The fourth passage connects to the first passage and the second passage and releases fluid from the valve. The valve assembly also includes a first check-valve that permits fluid flow from the second passage to the third passage and a second check-valve that permits fluid flow from the second passage to the fourth passage. The valve assembly additionally includes a nozzle that controls velocity of the relatively-high pressure fluid entering the fourth passage from the first passage. The relatively-low pressure fluid is pulled from the second passage into the fourth passage on the outer periphery of the nozzle by the relatively-high pressure fluid.

Abstract: An HV_ECU executes a program including: switching, if an operation is in an A/C intake mode and absolute value of temperature difference Thi?Tlo is larger than a predetermined value A and temperature Thi is smaller than a predetermined value B, the operation mode to a compartment intake mode; switching, if the operation is in the compartment intake mode, the compartment intake mode is requested to prevent increase in temperature difference, the absolute value of temperature difference Thi?Tlo is larger than a predetermined value A and temperature Thi is equal to or larger than the predetermined value B, the operation mode to an A/C intake mode; and executing a normal intake mode switching control.

Abstract: A heat exchange apparatus has four fluid ports through which a heat exchange fluid is pumped into and out of the heat exchange apparatus. First and fourth ones of the fluid sorts are on a first side of the heat exchange apparatus and second and third ones of the fluid ports (are on a second side of the heat exchange apparatus. At least two fluid pumps form a double flow circuit fluid pumping device for pumping the fluid in the first direction from the first fluid port to the second fluid port and in the second direction from the third fluid port to the fourth fluid port. One or more of a temperature detecting device, humidity detecting device, and gaseous or liquid state fluid composition detecting device are installed at a position capable of detecting the temperature, humidity, and fluid composition changes of the exchange fluid. The detected signals are used as references for modulating the pumping flow rate of exchange fluid.

Abstract: A work vehicle includes a frame and an axle assembly coupled to the frame, including a first axle shaft and coil substantially disposed in an axle housing. A first wheel couples to the first axle shaft of the axle assembly. An axle lubricating fluid is disposed within the axle housing. A cooling circuit fluidly coupled to the axle assembly circulates cooling fluid therethrough. The coil conducts cooling fluid through the first axle housing separately from the lubricating fluid. A cooling fluid circuit is selectively fluidly coupled to the first coil to circulate the cooling fluid therethrough.

Abstract: A machine including an engine cooling system, a secondary system with a low-temperature limit, and a secondary cooling system. A temperature sensor is associated with the secondary cooling system. The temperature sensor senses the secondary cooling system temperature and provides a temperature signal. A control valve has an open position allowing fluid communication between the engine cooling system and the secondary cooling system, and a closed position disallowing fluid communication. A controller receives signals from the secondary system temperature sensor and commands the control valve to open when the secondary cooling system temperature is below the low-temperature limit.

Abstract: A powertrain cooling system includes a coolant pump and coolant flow passages. A first three-position valve is operatively connected with an outlet of the coolant pump and has a first, a second, and a third position to at least partially establish different coolant flow modes through the coolant flow passages. Coolant flow from the coolant pump is blocked from both the cylinder head and the engine block in a first coolant flow mode when the three-position valve is in the first position. Coolant flow from the coolant pump is provided to the cylinder head and is blocked from the engine block in a second coolant flow mode when the three-position valve is in the second position. Coolant flows from the coolant pump to the engine block and from the engine block to the cylinder head in a third coolant flow mode when the three-position valve is in the third position.

Abstract: An environmental control systems (ECS) for an aircraft in which bleed air is cooled with ram air, the ECS may include a ram air controller configured to control a rate of ram air flow responsively to a desired temperature of bleed air at a bleed air outlet and a bleed air controller configured to control a rate of bleed air flow responsively to a temperature lower than the desired temperature of the bleed air at the bleed air outlet. Collectively the two controllers may provide a minimizing of ram air usage for cooling the bleed air.

Abstract: A heat exchanger for a vehicle includes: a heat releasing unit that is stacked with a plurality of plates and that forms connection flow channels to intersect at the inside thereof to inject other working fluids and that exchanges a heat of working fluids that pass through the respective connection flow channels, a bypass unit that is formed in the heat releasing unit to form a plurality of inflow holes and exhaust holes that inject and exhaust the working fluids to the respective connection flow channels and that connects the inflow hole and the exhaust hole that is connected to one of the respective connection flow channels, and a valve unit that is mounted within the heat releasing unit to correspond to the inflow hole that forms the bypass unit and that is selectively opened or closed using a deformation force of bimetal that is deformed according to a temperature of a working fluid that is injected into the inside thereof to inject the working fluid into the heat releasing unit and the bypass unit.

Abstract: A cooling arrangement having a first circuit and a second circuit in fluid communication of a coolant with each other. The cooling arrangement includes a pump configured to receive the coolant from the first circuit and the second circuit, and to re-circulate the coolant back to the first circuit and the second circuit. Further, the cooling arrangement includes an after-cooler disposed in the first circuit. A thermostat is provided in connection with the after-cooler to regulate a flow of the coolant supplied to the pump based on the temperature of the coolant from the after-cooler. Further, a bypass line is disposed in parallel to the thermostat in the first circuit. The bypass line is configured to provide a constant bleed of the coolant from the first circuit to the pump.

Abstract: A by-pass valve for a heat exchanger circuit. The by-pass valve includes a housing defining a serially communicating first bore, second bore and third bore substantially aligned along a central axis with a valve seat facing the first bore at a juncture between the first bore and second bore and a spring seat facing the second bore at a juncture between the second bore and third bore, the first bore, second bore and third bore forming at least a portion of a closable flow path between a first opening and a second opening in the housing. An actuator located in the housing has a reciprocating seal disposed for movement along the central axis for engaging the valve seat and closing a valve opening between the first bore and second bore. A coiled return spring is mounted in the housing for urging the reciprocating seal towards the first bore to open the valve opening, the return spring having a first end acting on the reciprocating seal and a second end engaging the spring seat.

Abstract: An apparatus for cooling a substantially closed space with recirculation air having at least one cooling unit which includes a heat exchanger with a primary set of ducts and a secondary set of ducts, each set of ducts having an in- and outlet. The unit includes a controller to control an operation of the unit, and a sensor to provide a sensor signal representative of a parameter of the unit. The controller is arranged to derive a control signal from the sensor signal, whereby the unit includes a control signal output for outputting the control signal to another unit and a control signal input for receiving a control signal from another unit, the controller being arranged to control the operation of the unit in response to the control signal and the control signal from another unit as received at the control signal input.

Abstract: Heat pumps that heat or cool a space and that also heat water, refrigerant management systems for such heat pumps, methods of managing refrigerant charge, and methods for heating and cooling a space and for heating water. Various embodiments deliver refrigerant gas to a heat exchanger that is not needed for transferring heat, drive liquid refrigerant out of that heat exchanger, isolate that heat exchanger against additional refrigerant flowing into it, and operate the heat pump while the heat exchanger is isolated. The heat exchanger can be isolated by closing an electronic expansion valve, actuating a refrigerant management valve, or both. Refrigerant charge can be controlled or adjusted by controlling how much liquid refrigerant is driven from the heat exchanger, by letting refrigerant back into the heat exchanger, or both. Heat pumps can be operated in different modes of operation, and segments of refrigerant conduit can be interconnected with various components.

Abstract: A heat exchanger may include a heat radiating portion provided with first, second, and third connecting lines formed in a predetermined sequence by stacking a plurality of plates, and receiving first, second, and third operating fluids respectively into the first, second, and third connecting lines, the first, second, and third operating fluids exchanging heat with each other while passing through the first, second, and third connecting lines and the first, second, and not being mixed with each other while being circulated, and a bifurcating portion connecting an inflow hole for flowing one operating fluid of the first, second, and third operating fluids with an exhaust hole for exhausting the one operating fluid, adapted for the one operating fluid to bypass the heat radiating portion according to a temperature of the one operating fluid, and mounted at an exterior of the heat radiating portion.