In a waste heat recovery device comprising a Rankine cycle in which working fluid circulates and a cooling circuit in which coolant water of an engine circulates, a heat source of a heater of the Rankine cycle is waste heat of the engine. A condenser of the Rankine cycle is configured to exchange heat between the working fluid and coolant water of a third coolant water circuit configured to circulate coolant water having passed through a radiator without passing through the engine.

A control method of a waste heat recover device, the control method includes measuring a first state value of an organic refrigerant discharged from an organic refrigerant evaporator by a first state value measuring unit; determining whether the first state value measured by the first state value measuring unit deviates from a first set range and controlling a flow rate of an organic refrigerant introduced into the organic refrigerant evaporator by a first organic refrigerant variable valve when it is determined that the first state value deviates from the first set range.

The present invention relates to a Rankine system comprising a valve including a valve member. The valve member is provided with a valve controlling element in the form of an elongated tapered end portion with a tip end facing the duct, wherein the tapered end portion is arranged to be inserted through the opening and into the duct as the valve member is moved towards the valve seat. The actuator is configured to hold the valve member in at least one intermediate position between the first and second end positions, where the tapered end portion occupies a portion of a cross-sectional fluid through-flow area defined by the duct so as to partly restrict a flow of fluid through the duct.

A multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine, comprising an internal combustion engine (1), wherein the present invention also comprises a steam Rankine cycle system (2) which is capable of heat exchanging with the high temperature exhaust exhausted from the IC engine (1) to make the steam turbine (22) do expansion work. An organic Rankine cycle system which is respectively heat exchanged with high temperature exhaust, jacket water and charge air which are exhausted from the IC engine (1), and with condensation heat in the steam Rankine cycle system (2) to do expansion work; a lithium bromide refrigerator (4) which uses jacket waterpart of jacket water discharged from the IC engine (1) as a heat source of the absorption cooling system for heat exchange; and a hot water heat exchanger (5) connected with a high temperature exhaust of the IC engine (1) for heating domestic water. The energy tower of the present invention adopts multiple waste heat recovering methods and combines cooling, heating and power supplying methods, which improves comprehensive energy utilization efficiency of the system and achieves the effects of energy saving and emission reduction.

An exhaust heat recovery system. The system includes a heat exchanger configured to transfer heat from engine exhaust to a heat transfer fluid. A reservoir is in fluid communication with the heat exchanger. A pump is configured to pump the heat transfer fluid out of the heat exchanger and into the reservoir, and in doing so displace air out of the reservoir to the heat exchanger, when temperature of the heat transfer fluid exceeds a predetermined temperature.

A pressure relief valve is opened from a first time to a second time for the purpose of reducing the pressure in the gas phase in a gas-liquid separator. A first water pump (WP) is driven at a third time and a fourth time. The third time and fourth time correspond to timings at which a difference between a boiling temperature and an actual temperature becomes equal to or greater than a predetermined temperature. Since liquid-phase coolant in a catch tank can be fed to another water pump by driving the first WP, the actual temperature of the liquid-phase coolant immediately upstream of the other water pump can be lowered. It is thus possible to prevent intense boiling of the liquid-phase coolant immediately upstream of the other water pump.

An engine waste heat recovery (WHR) system includes a turbocharger WHR portion, an exhaust WHR portion, an expander in the exhaust WHR portion, a condenser, valves, and a controller. The expander receives a working fluid in a superheated form and converts thermal energy in the working fluid into mechanical energy or electrical energy. The condenser condenses the working fluid for recirculation through the engine WHR system. The recuperator is fluidly coupled between the expander and the condenser to allow the working fluid to flow from the expander to the condenser. The recuperator transfers thermal energy to a flow of the working fluid from the turbocharger WHR portion. Each valve is fluidly coupled to one of the turbocharger WHR portion and the exhaust WHR portion. The controller is electrically coupled to the valves, and the controller selectively controls the valves to selectively circulate the working fluid through the engine WHR system.

A vehicle has a waste heat recovery (WHR) system and an engine. The WHR system includes a WHR working fluid circuit with a pump, a power turbine, and a condenser. An engine coolant circuit circulates coolant between the engine and an engine coolant heat exchanger/working fluid boiler in the WHR working fluid circuit. At least one exhaust gas heat exchanger/superheater in the WHR working fluid circuit receives waste heat from an exhaust circuit and/or from an exhaust gas recirculation circuit. A working fluid cooled charge air cooler in the WHR working fluid circuit receives waste heat from compressed charge air in a charge air intake circuit. A recuperator may transfer waste heat from working fluid passing from the power turbine to the condenser to working fluid passing from the working fluid cooled charge air cooler to the engine coolant heat exchanger/working fluid boiler.

A cooling system for a combustion engine and a WHR-system in a vehicle (1) includes a first line (23) directing coolant at a first temperature (T.sub.1) to a condenser (18) of the WHR system, a second line (24) directing coolant at a second temperature (T.sub.2) to the condenser (18), a valve arrangement (25, 26, 29) by which the flow rate of the coolant in at least one of the lines (23, 24) is adjustable and a control unit (20) configured to control the valve arrangement (25, 26, 29) such that the coolant directed to the condenser (18) from the lines (23, 24) has a temperature and a flow rate which results in a cooling of the working medium in the condenser (18) to a predetermined condensation temperature/pressure at the actual operating condition.

Apparatus for utilizing heat wasted from an engine includes: a Rankine cycle (31); a transmission mechanism that couples an output shaft of an expansion device (37) to a rotary shaft of an engine via an electromagnetic clutch (32) that can be engaged and disengaged; a passage (65) through which refrigerant exiting a heat exchanger (36) flows so as to bypass the expansion device (37); and a bypass valve (66) interposed in the passage. To stop the expansion device (37), the electromagnetic clutch (32) is switched from an engaged state to a disengaged state after switching the bypass valve (66) from a closed state to an open state. If the bypass valve (66) becomes stuck in the closed state, expansion device front-rear differential pressure limiting processing in which a front-rear differential pressure of the expansion device is limited while maintaining the electromagnetic clutch (32) in the engaged state is performed.