摘要:
In a waste heat recovery system wherein a heat exchanger derives heat from an engine exhaust, a venturi is fluidly connected to an engine exhaust port so as to thereby increase the flow rate and reduce the pressure in a manifold which is fluidly connected between the venturis and the heat exchanger. A fan is provided downstream of the heat exchanger to draw hot gases from the manifold, through the heat exchanger and discharge it to ambient. But when the fan is not operating during periods in which the engine is operating, the lower pressure manifold will draw ambient air in through the fan and through the heat exchanger, with the ambient air then being entrained in the exhaust gases being discharged from an exhaust channel downstream of the venturi. In one embodiment, a plurality of heat sources are provided with each having its own venturi connected to the common low pressure manifold. One or more of the plurality of waste heat source may be nonoperative or operating at a lower speed, but because of the low pressure manifold, the hot gases from the operative/higher speed waste heat source will not flow to the nonoperative or slower running waste heat source. Check valves are provided to allow the discharge of hot gases to ambient from the exhaust channels but not allow the flow of ambient air into the exhaust channels. A bypass valve is provided to selectively allow for the flow of ambient air into the exhaust channel and into the manifold for purposes of dilution during periods in which the fan is in operation.
摘要:
In a waste heat recovery system wherein an organic rankine cycle system uses waste heat from the fluids of a reciprocating engine, provision is made to continue operation of the engine even during periods when the organic rankine cycle system is inoperative, by providing an auxiliary pump and a bypass for the refrigerant flow around the turbine. Provision is also made to divert the engine exhaust gases from the evaporator during such periods of operation. In one embodiment, the auxiliary pump is made to operate simultaneously with the primary pump during normal operations, thereby allowing the primary pump to operate at lower speeds with less likelihood of cavitation.
摘要:
A system (170) has a compressor (22). A heat rejection heat exchanger (30) is coupled to the compressor to receive refrigerant compressed by the compressor. A non-controlled ejector (38) has a primary inlet coupled to the heat rejection exchanger to receive refrigerant, a secondary inlet, and an outlet. The system includes means (172, e.g., a nozzle) for causing a supercritical-to-subcritical transition upstream of the ejector.
摘要:
An ejector mixer has a convergent section and a downstream divergent section downstream of the convergent section. The downstream divergent section has a divergence half angle of 0.1-2.0° over a first span of at least 3.0 times a minimum diameter of the mixer.
摘要:
A heat exchanger is described comprising a distributor having an outer housing and including a plurality of substantially parallel plates disposed within the housing and configured to partition an input two-phase flow into a series of primarily single-phase layers. A heat exchanger is described comprising a distributor having an outer housing including a plurality of substantially parallel channels disposed therein, each channel configured to uniformly and independently convey a portion of a homogenous input two-phase flow from an input of the distributor to an output of the distributor.
摘要:
An example power generation system includes a vapor generator, a turbine, a separator and a pump. In the separator, the multiple components of the working fluid are separated from each other and sent to separate condensers. Each of the separate condensers is configured for condensing a single component of the working fluid. Once each of the components condense back into a liquid form they are recombined and exhausted to a pump that in turn drives the working fluid back to the vapor generator.
摘要:
A system (200; 250; 270) has a compressor (22), a heat rejection heat exchanger (30), first (38) and second (202) ejectors, first (64) and second (220) heat absorption heat exchangers, and a separator. The ejectors each have a primary inlet (40, 204) coupled to the heat rejection exchanger to receive refrigerant. A second heat absorption heat exchanger (220) is coupled to the outlet of the second ejector to receive refrigerant. The separator (48) has an inlet (50) coupled to the outlet of the first ejector to receive refrigerant from the first ejector. The separator has a gas outlet (54) coupled to the secondary inlet (206) of the second ejector to deliver refrigerant to the second ejector. The separator has a liquid outlet (52) coupled to the secondary inlet (42) of the first ejector via the first heat absorption heat exchanger to deliver refrigerant to the first ejector.
摘要:
A thermoelectric device (31) includes a plurality of alternating p-type and n-type semiconductor thermoelectric elements (32, 34, 36; 33, 35 37) the elements (32-37) being separated by electrically and thermally conductive interconnects (40-45), alternating interconnects (40-44) extending in an opposite direction from interconnects (41-45) interspersed therewith. Each thin-film element comprises several hundred thermoelectric alloy A superlattice thin-films interspersed with several hundred thermoelectric alloy B superlattice thin-films, the thin-film elements being between 5 and 25 microns thick and preferably over 10 microns thick. The thin-film elements may be interspersed with opposite type thin-film elements or with opposite type bulk elements (33a, 34a). The interconnects are preferably joined to the elements by diffusion bonding.
摘要:
An example power generation system includes a vapor generator, a turbine, a separator and a pump. In the separator, the multiple components of the working fluid are separated from each other and sent to separate condensers. Each of the separate condensers is configured for condensing a single component of the working fluid. Once each of the components condense back into a liquid form they are recombined and exhausted to a pump that in turn drives the working fluid back to the vapor generator.
摘要:
A power generation system includes a non-azeotropic working fluid mixture and a Rankine cycle system. The Rankine cycle system includes a turbine generator that is driven by vapor of the first working fluid mixture, and a condenser that exchanges thermal energy between the vapor received from the turbine generator and a cooling medium. The working fluid mixture is characterized by a condenser temperature glide during phase change between approximately five degrees and thirty degrees Kelvin, a condensing pressure between approximately one tenth of one percent and eleven percent of a critical pressure of the working fluid mixture, and a condenser bubble point temperature between approximately one degree and nine degrees Kelvin greater than a temperature at which the cooling medium is received by the condenser.