A variable channel heat exchanger for improving the efficiency of organic Rankine cycle
A circulating flow channel, shell-and-tube heat exchanger technology, used in refrigerators, lighting and heating equipment, evaporators/condensers, etc. It can improve the heat exchange efficiency and the effect of high superheat degree.
Inactive Publication Date: 2019-01-22
SOUTHEAST UNIV +1
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Problems solved by technology
[0006] This greatly increases the flow rate of the gaseous circulating working fluid in the evaporator, reduces the heat absorption capacity of the circulating working fluid in the heat exchanger, and reduces the superheat of the gaseous working medium at the outlet of the heat exchanger
On the contrary, the flow rate of the liquid circulating working fluid in the condenser is extremely reduced, and the heat release capacity of the circulating working fluid in the condenser is reduced
[0007] Therefore, it is necessary to develop a heat exchanger that can be applied to the organic Rankine cycle power system with higher cycle efficiency, so that the heat exchanger can avoid the reduction of heat transfer efficiency due to the change of the flow rate of the circulating working fluid.
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[0026] The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.
[0027] Such as figure 1 , the evaporator (1), the expander (2), the condenser (4), the working medium pump (5), and the evaporator (1) are connected in sequence. The generator (3) is connected with the expander (2) through bearings. The invention mainly aims at improving the heat exchange efficiency of the evaporator (1) and the condenser (4) in the organic Rankine cycle system, and increasing the superheat degree of the working fluid at the outlet of the evaporator (1). And then improve the efficiency of the organic Rankine cycle.
[0028] Such as figure 2 , a shell-and-tube heat exchanger for an organic Rankine cycle: first, the liquid first working fluid A enters a manifold, and with the heat exchange between the first working fluid A and the second working fluid B outside the tube, the first working fluid Substance A evaporates, an...
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The invention discloses a variable flow channel type heat exchanger capable of improving organic Rankine cycle efficiency. An organic Rankine cycle system comprises an evaporator, an expanding machine, a power generator, a condenser and a working medium pump which are connected through pipelines. In order to improve the efficiency of the system, the evaporator and the condenser in the system adopt the following variable flow channel modes: as for a tube-shell heat exchanger, the number of heat exchanger flow channels is changed by adding heat exchange tube branch tubes gradually; and as for a plate type heat exchanger, the number of heat exchanger flow channels is changed by elongating the flow path of working media in cavities between plates. By adopting the variable flow channel type heat exchanger, the problem that increasing flow resistance is caused by working medium phase changes of traditional heat exchangers is solved, and the flow pattern of the working media tends to be in a ring shape all the time, so that the heat exchange capability of the heat exchanger is enhanced, and then the thermal collection efficiency and condensing efficiency of the organic Rankine cycle system are improved. The variable flow channel type heat exchanger is suitable for phase change heat transfer on cold and heat source sides of the organic Rankine cycle system.
Description
technical field [0001] The invention relates to a heat exchanger, which includes the change of the flow rate of circulating working fluid in an organic Rankine cycle in an evaporator and a condenser, and in particular to a variable channel heat exchanger for optimizing the efficiency of the Rankine cycle. Background technique [0002] In the organic Rankine cycle power system, the evaporator (1), the expander (2), the condenser (4), the working medium pump (5), and the evaporator (1) are connected in sequence. The generator (3) is connected with the expander (2) through bearings. [0003] Wherein, both the evaporator (1) and the condenser (4) belong to heat exchangers, and their heat exchange efficiency plays an important role in the efficiency of the organic Rankine cycle. [0004] In the organic Rankine cycle power system, the circulating working medium absorbs heat in the evaporator to completely evaporate the liquid working medium into gas, and then push the expander to...
Claims
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IPC IPC(8): F25B39/00
Inventor 陈九法齐东昇刘玉兰曹政
Owner SOUTHEAST UNIV