CN102853578A - Mixed working medium two-stage jet type refrigerating machine - Google Patents
Mixed working medium two-stage jet type refrigerating machine Download PDFInfo
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Abstract
The invention discloses a mixed working medium two-stage jet type refrigerating machine which comprises a throttling element, an evaporator, two ejectors, two condensers, two pumps and two generators. The mixed working medium two-stage jet type refrigerating machine further comprises a low pressure stage condenser for converting a fluid working medium at an outlet of a low pressure stage ejector into gas-liquid mixture and a first gas-liquid separator for separating the gas-liquid mixture into two phases, an air-phase outlet of the first gas-liquid separator is connected with an ejection fluid inlet of a high pressure stage ejector, and a liquid-phase outlet of the first gas-liquid separator is connected with working fluid inlets of a low pressure stage pump, a low pressure stage generator and the low pressure stage ejector sequentially in series. The mixed working medium is utilized, part of a middle pressure working medium at the outlet of the lower pressure stage ejector is congealed and pumped in the low pressure stage generator, load of the high pressure stage ejector is reduced, an integral performance effect of a system is improved, and the mixed working medium two-stage jet type refrigerating machine is good in application prospect.
Description
Technical field
The invention belongs to refrigeration technology field, especially relate to a kind of mixed working fluid two-stage ejector type refrigerating machine.
Background technology
Injector was used for refrigeration first in 1910, and be widely used in the air-conditioning refrigeration system of building the thirties in 20th century, but higher by efficient subsequently, the compacter mechanical compression type refrigeration of equipment replaces, and the after this research work of injector stays cool always.Along with the appearance of energy crisis and the raising of people's awareness of saving energy, spray type refrigerating has obtained people's concern again.
The spray type refrigerating technology is a kind of Refrigeration Technique of heat-driven, comparing its major advantage with the mechanical compression type Refrigeration Technique is the mechanical energy that only needs to consume seldom, can directly utilize heat energy as drive energy, have that device structure is simple, volume is little, cost is low, an advantage such as reliable, long service life.
Chinese invention patent ZL200610104934.9, " a kind of self-overlapping refrigerating cycle system with injector " discloses the self-overlapping refrigerating cycle system with injector, comprise compressor, condenser, gas-liquid separator, evaporative condenser, evaporimeter and expansion valve that pipeline links to each other, also have injector between evaporative condenser and the evaporimeter.The injector supercharging can improve suction pressure of compressor, reduces pressure ratio, reduces work done during compression.But when the condensation temperature of ejector refrigeration system was higher, the single-stage spray type refrigerating was difficult to provide the pressure reduction of condenser and evaporimeter in the system.
In traditional single-stage injection refrigerating system, to set up an injector although publication number is the disclosed refrigeration system of the two-stage steam jet refrigeration system of CN101832680A, with the pressurization of performance injector to refrigerant vapour, to improve coefficient of refrigerating performance, but add an injector load of injector is increased.Chinese invention patent ZL200910304106.X and for example, " a kind of auto-cascade injection low-temperature refrigeration circulating device " discloses a kind of auto-cascade injection low-temperature refrigeration circulating device, comprise generator, gas ejector, working medium pump, condenser, gas-liquid separator, evaporator unit and condensation injector, wherein the gas ejector outlet links to each other with the import of condensation injector injection, although the series connection by two-stage ejector (being divided into hiigh pressure stage and low-pressure stage) can provide larger pressure reduction, but because the flow of hiigh pressure stage is larger, the Energy Efficiency Ratio of system is still very low.
Summary of the invention
The present invention is directed to deficiency and the defective of existing ejector refrigeration system, proposed a kind of mixed working fluid two-stage ejector type refrigerating machine, improve the performance of system by flow and the load that reduces simultaneously hiigh pressure stage injector and low-pressure stage injector.
A kind of mixed working fluid two-stage ejector type refrigerating machine, comprise low-pressure stage injector and hiigh pressure stage injector, be connected with the first loop between the working fluid import of the outlet of described hiigh pressure stage injector and hiigh pressure stage injector, the first loop comprises hiigh pressure stage condenser, hiigh pressure stage pump and the hiigh pressure stage generator of connecting successively with the outlet of hiigh pressure stage injector; Be connected with second servo loop between the driving fluid import of the outlet of described hiigh pressure stage injector and described low-pressure stage injector, second servo loop comprises hiigh pressure stage condenser, first throttle element and the evaporimeter of connecting successively with the outlet of hiigh pressure stage injector; Comprise that the fluid working substance with the outlet of low-pressure stage injector is converted into the low-pressure stage condenser of gas-liquid mixture, be used for described gas-liquid mixture is separated into the first gas-liquid separator of two-phase, the gaseous phase outlet of the first gas-liquid separator links to each other with the driving fluid import of hiigh pressure stage injector, connect the successively working fluid import of low-pressure stage pump, low-pressure stage generator and low-pressure stage injector of the liquid-phase outlet of the first gas-liquid separator.
Among the present invention, the zeotrope that the fluid working substance of filling in the ejector type refrigerating machine mixes for two or more working medium, wherein be rich in higher boiling working medium at the saturation pressure under the condensation temperature of low-pressure stage condenser greater than being rich in the saturation pressure of low boiling working fluid under evaporating temperature, be rich in low boiling working fluid at the saturation pressure under the condensation temperature of hiigh pressure stage condenser greater than being rich in the saturation pressure of higher boiling working medium under the condensation temperature of low-pressure stage condenser.The pure working medium of the fluid of selecting can be various pure cold-producing mediums, as with R245fa as higher boiling working medium, with R600a as low boiling working fluid.
Among the present invention, described intermediate pressure is a certain pressure between evaporating pressure and hiigh pressure stage condensing pressure.
Among the present invention, described evaporating temperature for mixed working fluid, refers to the dew-point temperature of evaporimeter inner refrigerant; For pure refrigerants, refer to the gasification temperature of evaporimeter inner refrigerant.
Among the present invention, described condensation temperature for mixed working fluid, refers to the dew-point temperature of condenser inner refrigerant; For pure refrigerants, refer to the adiabatic condensation temperature of condenser inner refrigerant.
Workflow of the present invention is: become gases at high pressure after the fluid that is rich in higher boiling working medium absorbs heat in the low-pressure stage generator, the fluid that is rich in higher boiling working medium of low-pressure stage generator exports enters the fluid that is rich in low boiling working fluid in the low-pressure stage injector injection evaporimeter as working fluid, the fluid that is rich in low boiling working fluid is boosted to intermediate pressure (referred to as middle pressure) by injection, and in the low-pressure stage injector with after the fluid that is rich in higher boiling working medium mixes through the heat release of low-pressure stage condenser condenses, fluid-mixing is entered the first gas-liquid separator by partial liquefaction.The liquid that is rich in higher boiling working medium in the first gas-liquid separator enters the low-pressure stage generator by low-pressure stage pump pressurization, and the gas that is rich in low boiling working fluid in the first gas-liquid separator is boosted by the fluid injection that is rich in low boiling working fluid of hiigh pressure stage generator exports high pressure and passes into the heat release of hiigh pressure stage condenser condenses and become liquid.The fluid body that is rich in low boiling working fluid of hiigh pressure stage condensator outlet is divided into two strands, and wherein one absorbs heat in the hiigh pressure stage generator by the hiigh pressure stage pump becomes gases at high pressure; Another stock-traders' know-how enters evaporator evaporation heat absorption acquisition refrigerating capacity after crossing the first throttle element.System finishes the one action process.Get off directly to pump into the low-pressure stage generator because the middle pressure of low-pressure stage injector outlet is rich in the fluid condensation of higher boiling working medium quilt, reduce flow and the load of hiigh pressure stage injector, thereby play the effect of the effect that improves the entire system performance.
Described high pressure generator and low pressure generator can be by solar energy, motor exhaust, and fuel combustion heat, the external heat sources such as electric current Joule heat drive.
Low-pressure stage condenser and hiigh pressure stage condenser are cooled off by extraneous low-temperature receiver.The condensation temperature of the condensation temperature of low-pressure stage condenser and hiigh pressure stage condenser can be identical also can be different, specifically decide on selected fluid working substance and the operating mode that sets.
Described first throttle element, the second section fluid element can be selected U-shaped pipe, capillary, the versions such as choke valve.
As preferably, described second servo loop comprises the second gas-liquid separator that hiigh pressure stage condenser fluid working substance out is divided into the second section fluid element of gas-liquid mixture and described gas-liquid mixture is separated into two-phase, and the gaseous phase outlet of the second gas-liquid separator is linked to be the driving fluid import that is connected described hiigh pressure stage injector after a tunnel with the gaseous phase outlet of described the first gas-liquid separator; The liquid-phase outlet of the second gas-liquid separator is connected with described first throttle element.
After adopting above-mentioned preferred version, the liquid that is rich in low boiling working fluid of hiigh pressure stage condensator outlet enters the second gas-liquid separator after being throttled to intermediate pressure by the second section fluid element, the gas that is rich in low boiling working fluid in the second gas-liquid separator is boosted by hiigh pressure stage injector injection and enters the hiigh pressure stage condenser, enters the evaporator evaporation heat absorption behind the liquid process first throttle element that is rich in low boiling working fluid in the second gas-liquid separator and obtains refrigerating capacity.Since under the intermediate pressure can not throttling refrigeration the gas that is rich in low boiling working fluid walked by hiigh pressure stage injector injection, reduced flow and the load of low-pressure stage injector, play the effect that improves the entire system performance.
More preferred, the present invention includes the low-pressure stage regenerator, the low-pressure stage regenerator is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between low-pressure stage injector and the low-pressure stage condenser, and another heat exchange pipe is the connecting line between low-pressure stage pump and the low-pressure stage generator.Further, the present invention also can comprise the hiigh pressure stage regenerator, the hiigh pressure stage regenerator is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between hiigh pressure stage injector and the hiigh pressure stage condenser, and another heat exchange pipe is the connecting line between hiigh pressure stage pump and the hiigh pressure stage generator.
After adopting above-mentioned preferred version, the fluid working substance that utilizes the low-pressure stage injector to export preheats the fluid that is rich in higher boiling working medium of low-pressure stage pump discharge, utilize the fluid that is rich in low boiling working fluid that low boiling working fluid preheats the hiigh pressure stage pump discharge that is rich in of hiigh pressure stage injector outlet, thereby can reduce the heat that adds of hiigh pressure stage generator and low-pressure stage generator, play the effect that improves the entire system performance.
As preferably, the version that described the first gas-liquid separator, the second gas-liquid separator adopt rectifier realizes the good separation that is rich in higher boiling working medium and is rich in low boiling working fluid.
The present invention has following beneficial effect:
1. the present invention drives by hiigh pressure stage generator and two thermals source of low-pressure stage generator, need not to utilize the employed compressor of common refrigeration system;
2. the flow direction of the gas of gas-liquid separator outlet and liquid working substance is different, role is also different in circulation, the first gas-liquid separator gas out flows into the hiigh pressure stage injector among the present invention, liquid flows into solution pump (being the low-pressure stage pump), improve to reduce the load (namely reducing the flow of hiigh pressure stage injector) of hiigh pressure stage injector by this, reduce the generation heat of hiigh pressure stage generator, thereby improve system effectiveness.
In sum, compare the single-stage ejector refrigeration system, the present invention is owing to adopting two-stage ejector, can adopt one identical or adopt the thermal source of two different temperatures, larger condensing pressure and evaporating pressure pressure reduction can also be provided in addition, can under higher condensation temperature, move; Compare the two-stage ejector refrigeration system, the non-azeotropic mixed working medium that utilization of the present invention is mixed by two or more pure matter, make the middle pressure working medium partial condensation of low-pressure stage injector outlet get off directly to pump into the low-pressure stage generator, reduce the load of hiigh pressure stage injector; Second section fluid element outlet can not be used for the middle pressure Working medium gas of throttling refrigeration by hiigh pressure stage injector injection, reduced the load of low-pressure stage injector, thereby play the effect that improves the entire system performance, so the present invention can raise the efficiency greatly under identical operating mode.The present invention can be used for improving the performance of various existing ejector refrigeration systems in addition.
Description of drawings
Fig. 1 is the flow chart of one embodiment of the present invention.
Fig. 2 is the flow chart of another embodiment of the present invention.
Fig. 3 is the flow chart of another embodiment of the present invention.
Fig. 4 is the flow chart of existing single-stage ejector refrigeration system.
Fig. 5 is the flow chart of existing two-stage ejector refrigeration system.
Wherein: 1, first throttle element; 2, evaporimeter; 3, low-pressure stage injector; 4, low-pressure stage condenser; 5, the first gas-liquid separator; 6, hiigh pressure stage injector; 7, hiigh pressure stage condenser; 8, low-pressure stage pump; 9, low-pressure stage generator; 10, hiigh pressure stage pump; 11, hiigh pressure stage generator; 12, second section fluid element; 13, the second gas-liquid separator; 14, low-pressure stage regenerator; 15, hiigh pressure stage regenerator; 16, generator; 17, condenser; 18, injector; 19, solution pump; 20, hiigh pressure stage injector; 21, low-pressure stage injector; 1a, the first import; 1b, the first outlet; 2a, the second import; 2b, the second outlet; 3a, the first import; 3b, the first outlet; 4a, the second import; 4b, the second outlet.
The specific embodiment
Referring to the drawings and specific embodiments the present invention is described in further detail.
As shown in Figure 1, Fig. 1 is the flow chart of one embodiment of the present invention, mixed working fluid two-stage ejector type refrigerating machine shown in Figure 1 comprises first throttle element 1, evaporimeter 2, low-pressure stage injector 3, low-pressure stage condenser 4, the first gas-liquid separator 5, hiigh pressure stage injector 6, hiigh pressure stage condenser 7, low-pressure stage pump 8, low-pressure stage generator 9, hiigh pressure stage pump 10 and hiigh pressure stage generator 11, wherein, the outlet of the low-pressure stage injector 3 low-pressure stage condenser 4 of connecting successively, the import of the first gas-liquid separator 5, the liquid-phase outlet of the first gas-liquid separator 5, low-pressure stage pump 8, the working fluid import of low-pressure stage generator 9 and low-pressure stage injector 3; The gaseous phase outlet of the first gas-liquid separator 5 connect successively the driving fluid import of hiigh pressure stage injector 6, outlet and the hiigh pressure stage condenser 7 of hiigh pressure stage injector 6, the outlet of hiigh pressure stage condenser 7 is divided into two-way (being the first via and the second tunnel), the first via is connected successively with the working fluid import of hiigh pressure stage pump 10, hiigh pressure stage generator 11, hiigh pressure stage injector 6, and the second the tunnel is connected successively with the driving fluid import of first throttle element 1, evaporimeter 2, low-pressure stage injector 3.
Solid line is the circulation route that is rich in low boiling working fluid among the figure, and dotted line is the circulation route that is rich in higher boiling working medium.Being rich in becomes gases at high pressure after higher boiling working medium is absorbed heat in low-pressure stage generator 9, the higher boiling working medium that is rich in of low-pressure stage generator 9 outlet enters the low boiling working fluid that is rich in the low-pressure stage injector 3 injection evaporimeters 2 as working fluid, be rich in low boiling working fluid and boosted to intermediate pressure by injection, and in low-pressure stage injector 3 be rich in higher boiling working medium and mix after through the 4 condensation heat releases of low-pressure stage condenser, being rich in higher boiling working medium is liquefied fully, still be to enter the first gas-liquid separator 5 by gaseous state and be rich in low boiling working fluid.The higher boiling worker quality liquid that is rich in the first gas-liquid separator 5 is boosted and passes into the 7 condensation heat releases of hiigh pressure stage condenser and become liquid by the low boiling working fluid injection that is rich in of hiigh pressure stage generator 11 outlet high pressure by the low boiling working fluid gas that is rich in that low-pressure stage pump 8 pressurization enters in low-pressure stage generator 9, the first gas-liquid separators 5.The low boiling working fluid liquid that is rich in of hiigh pressure stage condenser 7 outlets is divided into two strands, and wherein one absorbs heat in hiigh pressure stage generator 11 by hiigh pressure stage pump 10 becomes gases at high pressure; Another stock-traders' know-how enters evaporimeter 2 evaporation endothermics acquisition refrigerating capacity after crossing first throttle element 1.System finishes the one action process.Because the middle pressure of low-pressure stage injector 3 outlet is rich in higher boiling working medium and is condensed and directly pumps into low-pressure stage generator 9, reduces flow and the load of hiigh pressure stage injector 6, thereby plays the effect that improves the entire system performance.Above-mentioned the first gas-liquid separator 5 can select to adopt the version of rectifier.
As shown in Figure 2, Fig. 2 is the flow chart of another embodiment of the present invention.Mixed working fluid two-stage ejector type refrigerating machine shown in Figure 2 comprises first throttle element 1, evaporimeter 2, low-pressure stage injector 3, low-pressure stage condenser 4, the first gas-liquid separator 5, hiigh pressure stage injector 6, hiigh pressure stage condenser 7, low-pressure stage pump 8, low-pressure stage generator 9, hiigh pressure stage pump 10, hiigh pressure stage generator 11, second section fluid element 12 and the second gas-liquid separator 13, wherein, the outlet of the low-pressure stage injector 3 low-pressure stage condenser 4 of connecting successively, the import of the first gas-liquid separator 5, the liquid-phase outlet of the first gas-liquid separator 5, low-pressure stage pump 8, the working fluid import of low-pressure stage generator 9 and low-pressure stage injector 3; Connect the successively driving fluid import of hiigh pressure stage injector 6 of the gaseous phase outlet of the first gas-liquid separator 5, the import of the outlet of hiigh pressure stage injector 6 and hiigh pressure stage condenser 7, the outlet of hiigh pressure stage condenser 7 is divided into two-way (being the first via and the second tunnel), the first via and hiigh pressure stage pump 10, hiigh pressure stage generator 11, the working fluid import of hiigh pressure stage injector 6 is connected successively, the second the tunnel links to each other with the import of the second gas-liquid separator 13, the gaseous phase outlet of the second gas-liquid separator 13 is linked to be the driving fluid import that is connected hiigh pressure stage injector 6 after a tunnel with the gaseous phase outlet of the first gas-liquid separator 5, the liquid-phase outlet of the second gas-liquid separator 13 and first throttle element 1, evaporimeter 2, the driving fluid import of low-pressure stage injector 3 is connected successively.
(solid line is the circulation route that is rich in low boiling working fluid on the figure by present embodiment, dotted line is the circulation route that is rich in higher boiling working medium), hiigh pressure stage condenser 7 being rich in of outlet enter the second gas-liquid separator 13 after low boiling working fluid liquid is throttled to intermediate pressure by second section fluid element 12, the low boiling working fluid gas that is rich in the second gas-liquid separator 13 is entered evaporimeter 2 evaporation endothermics after through first throttle element 1 and obtains refrigerating capacity by hiigh pressure stage injector 6 injections the being rich in low boiling working fluid liquid that enters in hiigh pressure stage condenser 7, the second gas-liquid separators 13 that boosts.Since under the intermediate pressure can not throttling refrigeration the low boiling working fluid gas that is rich in walked by hiigh pressure stage injector 6 injections, reduced flow and the load of low-pressure stage injector 3, have the effect that improves better the entire system performance therefore compare embodiment 1.Above-mentioned the second gas-liquid separator 13 can select to adopt the version of rectifier
As shown in Figure 3, Fig. 3 is the flow chart of another embodiment of the present invention.Mixed working fluid two-stage ejector type refrigerating machine shown in Figure 3 comprises first throttle element 1, evaporimeter 2, low-pressure stage injector 3, low-pressure stage condenser 4, the first gas-liquid separator 5, hiigh pressure stage injector 6, hiigh pressure stage condenser 7, low-pressure stage pump 8, low-pressure stage generator 9, hiigh pressure stage pump 10, hiigh pressure stage generator 11, second section fluid element 12, the second gas-liquid separator 13, low-pressure stage regenerator 14 and hiigh pressure stage regenerator 15, wherein, low-pressure stage regenerator 14 is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between low-pressure stage injector 3 and the low-pressure stage condenser 4, and another heat exchange pipe is the connecting line between low-pressure stage pump 8 and the low-pressure stage generator 9.Hiigh pressure stage regenerator 15 is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between hiigh pressure stage injector 6 and the hiigh pressure stage condenser 7, and another heat exchange pipe is the connecting line between hiigh pressure stage pump 10 and the hiigh pressure stage generator 11.Connect the successively working fluid import of liquid-phase outlet, low-pressure stage pump 8, low-pressure stage generator 9 and low-pressure stage injector 3 of import, the first gas-liquid separator 5 of the first outlet 1b, low-pressure stage condenser 4, the first gas-liquid separator 5 of the first import 1a, low-pressure stage regenerator 14 of low-pressure stage regenerator 14 of the outlet of low-pressure stage injector 3; The driving fluid import of the gaseous phase outlet of the first gas-liquid separator 5 and hiigh pressure stage injector 6, the outlet of hiigh pressure stage injector 6, the first import 3a of hiigh pressure stage regenerator 15, the first outlet 3b of hiigh pressure stage regenerator 15, the import of hiigh pressure stage condenser 7 is connected successively, the outlet of hiigh pressure stage condenser 7 is divided into two-way, the first via and hiigh pressure stage pump 10, the second import 4a of hiigh pressure stage regenerator 15, the second outlet 4b of hiigh pressure stage regenerator 15, hiigh pressure stage generator 11, the working fluid import of hiigh pressure stage injector 6 is connected successively, the second the tunnel successively with the import of second section fluid element 12, the outlet of second section fluid element 12, the import of the second gas-liquid separator 13 links to each other, the gaseous phase outlet of the second gas-liquid separator 13 is linked to be the driving fluid import that is connected hiigh pressure stage injector 6 after a tunnel with the gaseous phase outlet of the first gas-liquid separator 5, the liquid-phase outlet of the second gas-liquid separator 13 and first throttle element 1, evaporimeter 2, the driving fluid import of low-pressure stage injector 3 is connected successively.
(solid line is the circulation route that is rich in low boiling working fluid on the figure by present embodiment, dotted line is the circulation route that is rich in higher boiling working medium), that can utilize that the fluid working substance (comprising the fluid-mixing that is rich in higher boiling working medium and is rich in low boiling working fluid) of low-pressure stage injector 3 outlet preheats that low-pressure stage pump 8 exports is rich in higher boiling working medium, utilize the low boiling working fluid that is rich in that low boiling working fluid preheats 10 outlets of hiigh pressure stage pump that is rich in of hiigh pressure stage injector 6 outlets, thereby can reduce the heat that adds of hiigh pressure stage generator 11 and low-pressure stage generator 9, play the effect that improves the entire system performance.
Application examples
Referring to Fig. 4, Fig. 4 is a kind of existing single-stage ejector refrigeration system, comprise first throttle element 1, evaporimeter 2, solution pump 19, generator 16, condenser 17 and injector 18, wherein, the outlet of evaporimeter 2 connects the driving fluid import of injector 18, the outlet of injector 18 connects the import of condenser 17, and the outlet of condenser 17 is divided into two-way, wherein one tunnel working fluid import of connecting successively solution pump 19, generator 16 and injector 18; Another road connect successively first throttle element 1 and evaporimeter 2.
Referring to Fig. 5, Fig. 5 is a kind of existing two-stage ejector refrigeration system, comprise first throttle element 1, evaporimeter 2, low-pressure stage injector 21, hiigh pressure stage injector 20, condenser 17, solution pump 19 and generator 16, wherein, connect the successively driving fluid import of low-pressure stage injector 21 of the outlet of evaporimeter 2, the outlet of low-pressure stage injector 21, the driving fluid import of hiigh pressure stage injector 20, the outlet of hiigh pressure stage injector 20, the outlet of the import of condenser 17 and condenser 17, the outlet of condenser 17 is divided into two-way, one tunnel connect successively solution pump 19 and generator 16 wherein, the outlet of generator 16 is divided into two strands, connects respectively the working fluid import of hiigh pressure stage injector 20 and the working fluid import of low-pressure stage injector 21; Another road of condenser 17 outlet connect successively first throttle element 1 and evaporimeter 2.In this refrigeration system, low-pressure stage injector 21 is injected into intermediate pressure with fluid working substance, and said intermediate pressure is a certain pressure between evaporating pressure and condensing pressure herein.
Following comparative example's 2 refrigeration machines, Fig. 4 and system shown in Figure 5 are carried out analog computation, wherein embodiment 2 refrigeration machines with R245fa as higher boiling working medium, R600a is as low boiling working fluid, all take R245fa or R600a as working medium, the assumed condition of calculating is as follows: (1) system is in steady-working state for single-stage injection refrigerating system shown in Figure 4 and two-stage ejector refrigeration system shown in Figure 5; (2) ignore the pressure drop of pipeline and leak heat; (3) for the present embodiment 2 refrigeration machines, the first gas-liquid separator exit gas is approximate pure R600a, and outlet liquid is approximate pure R245fa; (4) evaporating temperature (is the evaporating temperature of working medium in the evaporimeter for Fig. 4, system shown in Figure 5 evaporating temperature, for embodiment 2 refrigeration machines, evaporating temperature is the dew-point temperature of working medium in the evaporimeter) be 5 ℃, hiigh pressure stage generator and low-pressure stage generator occurrence temperature are 100 ℃; (5) for two-stage ejector refrigeration system shown in Figure 5, intermediate pressure is the saturation pressure under the mean temperature of evaporating temperature and condensation temperature; (6) the low-pressure stage condenser is identical with the condensation temperature of hiigh pressure stage condenser.
Table 1 embodiment 2 refrigeration machines and Fig. 4, the performance comparison of Fig. 5 refrigeration system under different condensation temperatures
T in the table 1
cRefer to that (for Fig. 4, system shown in Figure 5, condensation temperature is the adiabatic condensation temperature of condenser 17 inner refrigerants to condensation temperature; For the refrigeration machine of embodiment 2, condensation temperature is the dew-point temperature of the inner refrigerant of hiigh pressure stage condenser or low-pressure stage condenser), COP
CjrThe coefficient of performance that refers to embodiment 2 refrigeration machines, COP
245Finger is with the coefficient of performance of R245fa as the single-stage ejector refrigeration system of working medium, η
245Refer to that the relative R245fa of embodiment 2 refrigeration machines is as the increase rate of the coefficient of performance of the single-stage ejector refrigeration system of working medium; COP
600Finger is with the coefficient of performance of R600a as the single-stage ejector refrigeration system of working medium, η
600Refer to that the relative R600a of embodiment 2 refrigeration machines is as the increase rate of the coefficient of performance of the single-stage ejector refrigeration system of working medium; COP '
245Finger is with the coefficient of performance of R245fa as the two-stage ejector refrigeration system of working medium, η '
245Refer to that the relative R245fa of embodiment 2 refrigeration machines is as the increase rate of the coefficient of performance of the two-stage ejector refrigeration system of working medium; COP '
600Finger is with the coefficient of performance of R600a as the two-stage ejector refrigeration system of working medium, η '
600Refer to that the relative R600a of embodiment 2 refrigeration machines is as the increase rate of the coefficient of performance of the two-stage ejector refrigeration system of working medium.
As can be seen from Table 1, the coefficient of performance of embodiment 2 refrigeration machines all significantly is higher than other ejector refrigeration system under the overwhelming majority's design condition.Especially when condensation temperature was higher than 50 ℃, other the ejector refrigeration system coefficient of performance was extremely low, almost can not work, and embodiment 2 refrigeration machines still can be under the coefficient of performance about 0.1 reliability service.So can find out the advantage of the relatively aforementioned two kinds of existing ejector refrigeration systems of embodiment 2 refrigeration machines.
Claims (8)
1. mixed working fluid two-stage ejector type refrigerating machine, comprise low-pressure stage injector (3) and hiigh pressure stage injector (6), be connected with the first loop between the working fluid import of the outlet of described hiigh pressure stage injector (6) and hiigh pressure stage injector (6), the first loop comprises hiigh pressure stage condenser (7), hiigh pressure stage pump (10) and the hiigh pressure stage generator (11) of connecting successively with the outlet of hiigh pressure stage injector (6); Be connected with second servo loop between the driving fluid import of the outlet of described hiigh pressure stage injector (6) and described low-pressure stage injector (3), second servo loop comprises the hiigh pressure stage condenser (7) of connecting successively with the outlet of hiigh pressure stage injector (6), first throttle element (1) and evaporimeter (2), it is characterized in that: comprise that the fluid working substance with the outlet of low-pressure stage injector (3) is converted into the low-pressure stage condenser (4) of gas-liquid mixture, be used for described gas-liquid mixture is separated into first gas-liquid separator (5) of two-phase, the gaseous phase outlet of the first gas-liquid separator (5) links to each other with the driving fluid import of hiigh pressure stage injector (6), the liquid-phase outlet of the first gas-liquid separator (5) the low-pressure stage pump (8) of connecting successively, the working fluid import of low-pressure stage generator (9) and low-pressure stage injector (3).
2. mixed working fluid two-stage ejector type refrigerating machine according to claim 1, it is characterized in that: described second servo loop comprises the second gas-liquid separator (13) that hiigh pressure stage condenser (7) fluid working substance out is divided into the second section fluid element (12) of gas-liquid mixture and described gas-liquid mixture is separated into two-phase, and the gaseous phase outlet of the second gas-liquid separator (13) is linked to be the driving fluid import that is connected described hiigh pressure stage injector (6) after a tunnel with the gaseous phase outlet of described the first gas-liquid separator (5); The liquid-phase outlet of the second gas-liquid separator (13) is connected with described first throttle element (1).
3. mixed working fluid two-stage ejector type refrigerating machine according to claim 1 and 2, it is characterized in that: comprise low-pressure stage regenerator (14), low-pressure stage regenerator (14) is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between low-pressure stage injector (3) and the low-pressure stage condenser (4), and another heat exchange pipe is the connecting line between low-pressure stage pump (8) and the low-pressure stage generator (9).
4. mixed working fluid two-stage ejector type refrigerating machine according to claim 1 and 2, it is characterized in that: comprise hiigh pressure stage regenerator (15), hiigh pressure stage regenerator (15) is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between hiigh pressure stage injector (6) and the hiigh pressure stage condenser (7), and another heat exchange pipe is the connecting line between hiigh pressure stage pump (10) and the hiigh pressure stage generator (11).
5. mixed working fluid two-stage ejector type refrigerating machine according to claim 3, it is characterized in that: comprise hiigh pressure stage regenerator (15), hiigh pressure stage regenerator (15) is with two heat exchange pipes of mutually isolating, wherein heat exchange pipe is the connecting line between hiigh pressure stage injector (6) and the hiigh pressure stage condenser (7), and another heat exchange pipe is the connecting line between hiigh pressure stage pump (10) and the hiigh pressure stage generator (11).
6. mixed working fluid two-stage ejector type refrigerating machine according to claim 3 is characterized in that: the version of described the first gas-liquid separator (5), the second gas-liquid separator (13) employing rectifier.
7. mixed working fluid two-stage ejector type refrigerating machine according to claim 4 is characterized in that: the version of described the first gas-liquid separator (5), the second gas-liquid separator (13) employing rectifier.
8. mixed working fluid two-stage ejector type refrigerating machine according to claim 5 is characterized in that: the version of described the first gas-liquid separator (5), the second gas-liquid separator (13) employing rectifier.
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| CN111397234A (en) * | 2020-03-05 | 2020-07-10 | 浙江大学 | Low-grade heat-driven mixed working medium refrigerating system |
| CN111928522A (en) * | 2020-08-14 | 2020-11-13 | 中国矿业大学 | Injection type refrigerating system capable of recovering condensation heat and method thereof |
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