Longgang District, Shenzhen, Guangdong China, Copyright © Shenzhen Lando Technology Industrial Co.,Ltd All Right Reserved | XML, WhatsApp : 86-15814051508 | Skype ID: fany828, Consider a two Stage Compression Refrigeration System- Lando, 8 Steps to Customize Laser Chiller in China Factories, Water Chiller Suppliers Shipping Photos in 2020, How to Antifreeze for Industrial Chillers, Glycol Chiller Manufacturers and Suppliers | Lando. The compression ratios of each stage are kept below 10. ... Chapter 3 contains a full description of the dynamic model of a two-stage refrigeration system, and Chapter 4 presents the ACSL simulation model implemented and illustrates its validity. The exhaust temperature is high, the lubricating oil becomes thin, the lubricating condition is weakened, even the oil will appear carbon phenomenon, and must use the high ignition point lubricating oil. As noted above, in the present invention, liquid refrigerant is expanded during transfer to the intermediate slurry tank 37. Therefore, the use of a two-stage compression refrigeration cycle is not in any case, is beneficial, in general, the single-stage ammonia refrigeration compressor compression ratio more than 8, fluorine more than 10, the use of two-stage compression is more economical and reasonable. As is shown in FIGS. The base serves to seal the seat against the valve body. The refrigerant must be immiscible in the liquid at a given temperature and pressure. One of the problems with Strong, that the present invention seeks to solve, includes the potential plugging of the system due to the particles of refrigerant clogging or freezing shut conduits, valves, or inlets and outlets. This direct injection causes the pressure drop to occur within the intermediate slurry tank 37 and helps avoid the problems of too large refrigerant particles, as well as expansion valve 18 freezing. 3, in a further aspect of the present invention, the conduit 19 may further comprise a valve 18 to control the flow of refrigerant through the conduit. In the present invention, the pump 43 is provided, and there is no equivalent device in Strong. A refrigeration system is described. Multi-stage refrigeration systems are an area of growing industrial importance in large plants. Referring to FIG. In addition, a spring 226 may be placed about a stem portion of rotor 225 and compressed against the adjacent end face of socket 231 to provide a compression force between the rotor 225 and the nozzle valve seat 227. Two-stage cascade systems. 3, the present invention has some design similarities to the prior art of Strong, but the present invention has several improvements and advantages over the prior art. For the Piston compressor, due to the existence of clearance volume, when the pressure ratio reached 20, the compressor almost no suction. an intermediate slurry tank for a refrigerant vapor and a slurry of solid sublimatable refrigerant particles in a liquid having a first outlet for outflow of the slurry, a second outlet for outflow of the vapor, and a first inlet for receiving the refrigerant; an evaporator having an inlet and an outlet; a first conduit connecting the first outlet of the intermediate slurry tank and the evaporator inlet; a compression system having a first low pressure inlet and second intermediate pressure inlet, and having a high pressure outlet; a second conduit connecting the evaporator outlet and the first low pressure inlet of the compression system; a third conduit connecting the second outlet of the intermediate slurry tank and the second intermediate pressure inlet of the compression system; a condenser having a condenser inlet and a condenser outlet; a fourth conduit connecting the compression system outlet and the condenser inlet; a condenser receiving tank having an inlet for receiving refrigerant and an outlet for receiving refrigerant; a fifth conduit connecting the condenser outlet and the condenser receiving tank inlet; and. The condenser receiving tank 16 stores the liquid CO2 condensate and may typically maintained at â12Â° F. and at 250 psia. Preferably the gas is the same substance as the refrigerant. If the valve 18 does freeze, hot gas may be fed into the conduit 19, as a vapor de-plug feed, just upstream of the valve 18 to remove the plug solids at the valve 18. Refrigeration system with two-stage compression 2. FMC CORPORATION, ILLINOIS, Free format text: Generally, two-stage compressed ammonia refrigeration system adopts intermediate complete cooling, while two-stage compressed Freon Refrigeration System Adopts Intermediate Incomplete Cooling. The liquid CO2 is expanded either on its way to the intermediate slurry tank or in the tank itself. Lando company consider using a two Stage Compression Refrigeration System for the new design of high power water chillers with LD-10HP. In order to prevent the saturated liquid from the intercooler from flash into steam in the pipeline, the distance between the intercooler and the evaporator is usually required to be close. (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers. The refrigerant must also be capable of sublimating at a temperature and pressure appropriate for refrigeration, while the liquid remains in liquid form at this temperature and pressure. The refrigeration systems with CO 2 seem to be attractive choices for the design of refrigeration systems with small environmental impact. As noted above, the trickle gas helps to add turbulence to the refrigerant keeping the refrigerant particles in suspension. This opening can define an angle of about 30Â°, but other shaped openings can also be used. A two-stage refrigeration system includes an intermediate slurry tank for receiving and storing a refrigerant vapor and a slurry of solid sublimatable refrigerant particles in a liquid. the evaporator with the first unit cools the condenser of the second unit). The longer time this pressure transition exists, the larger the refrigerant particles become. Referring to FIGS. 4 illustrates a valve seat according to a further aspect of the present invention; FIG. What is the principle a two-stage compression refrigeration cycle? The intermediate slurry tank 37 sends the slurry to the evaporator 3, the slurry being fed through a pump or by utilizing pressure and/or gravity from the intermediate slurry tank 37. In one embodiment, the distal end of the direct injection system 200 may be placed into intermediate tank 37 through an intermediate slurry tank port 217. The supercooled liquid from the coil of the intercooler is cooled again, and finally, the supercooled liquid enters the evaporator through an expansion valve. This greatly improves the efficiency of the refrigeration system. Location at the freezer may not be possible if the main slurry tank 36 is too large. A refrigeration recirculation line comprising: a slurry tank, for a vapor and a slurry of solid sublimatable particles in a liquid, having an inlet and an outlet; a first conduit connected to the slurry tank outlet; a recycle line connected to the first conduit and to the slurry tank inlet, wherein the slurry tank inlet is tangential to the vertical curvature of the slurry tank wall; and. Condenser fan motor issue, less heat transfer available for a given mass of … FIGS. Cascade systems. The separated flash gas can be returned to the compression system 10 for compression. 6 illustrates a cross sectional view of the direct injection system according to a further aspect of the present invention; FIG. wherein a gas trickle feed into the supply conduit to reduce the collection of solids in and around the valve. A compression system 10 has a first low pressure inlet 11 and second intermediate pressure inlet 42. becomes high. Hermetic low and high pressure compressors 3. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FMC CORPORATION;REEL/FRAME:012818/0963, Free format text: The low-pressure and low-temperature refrigerant vapor produced in the evaporator is sucked up by the low-pressure compressor and compressed into the superheated vapor of the intermediate pressure, and then enters the intermediate cooler of the same pressure and is cooled into dry saturated vapor in the intercooler. The prior art of Strong describes agitating the bottoms of mixing tank 37â² by feeding back slurry from conduit 4â². 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Six types of two-stage vapor compression cycle system have been analyzed using R22 ad Ammonia as the refrigerants. FIG. A refrigerator expansion line as claimed in, 27. This vapor CO2 is separated in the intermediate slurry tank 37, and as stated previously returned to the compression system 10. Generally, for fluorocarbon and ammonia based refrigeration systems a single stage system is used upto an evaporator temperature of –30oC. The mixing tank 37â² has a first outlet 5â², second outlet 34â², a first inlet 31â², and a second inlet 17â². Two-stage refrigeration system. Conventional Refrigeration Cycle Index Terms—Condenser load, Compressor capacity, Hub ratio, Intercooler _____ I. 3. Since the low stage is adequate to meet household comfort demands 80% of the time, a two-stage unit runs for longer periods and produces more even temperatures. The middle pressure is 0.355 MPA (absolute pressure), the pressure ratio is 1.353 / 0.3553.81 for high- pressure stage and 0.355 / 0.09333.82 for low- pressure stage. The main slurry tank sends the slurry back to the intermediate slurry tank 37, and sends the vapor to the compression system 10. A two stage cascade system has high temperature cycle and low temperature cycle. In a further aspect of the present invention the conduit from the condenser receiving tank to the intermediate slurry tank may be modified to reduce refrigerant particle size as well as reducing the risk of plugging of the conduit or freezing of a valve in the conduit. The linear actuator 215, used with the valve needle 203 above, may be replaced with a rotor actuator which can act on extended spindle 211 to rotate rotor 225 to vary the flow of refrigerant 17 from the direct injection system. The expansion produces flash gas. In one embodiment a linear actuator 215 may be connected to the proximal end of inner pipe 207 by a housing 219. The vapour refrigerant is compressed in a two stage centrifugal compressor driven by a steam turbine. For the present invention it is desirable to keep the refrigerant particles small to increase the surface area to mass ratio, for refrigeration efficiency as well as improved suspension in slurry. In another aspect of the invention, the compression system 10 of the present invention may be of various arrangements. PERFORMANCE STUDY OF A TWO STAGE SOLAR ADSORPTION REFRIGERATION SYSTEM BAIJU. This upward slope minimizes the amount of fluid in contact with the valve 18 when it is shut, which in turn minimizes the risks of the valve 18 freezing shut. The system operates the evaporator at $-32^{\circ} \mathrm{C}$, the condenser at $1400 \mathrm{kPa}$, and the separator at $8.9^{\circ} \mathrm{C} .$ The refrigerant is circulated through the condenser at a rate of 2 kg/s. A two-stage cascade system uses two pairs of compressor plants, working individually with different refrigerants, connected among themselves so that evaporator one system is used to serve as the capacitor to a lower temperature of the system (i.e. In one embodiment the seat 101 allows flow only when the handle position of the valve 18 is at least about 20% open. Generally, two-circuit and rarely three-circuit cascade systems are used for low temperature refrigeration In the present study a critical review is discussed about analysis of two stage cascade refrigeration system with The large volume of slurry in the intermediate slurry tank 37 can be stirred by the addition of refrigerant from the condenser receiving tank 16. a sixth conduit connecting the second outlet of the intermediate slurry tank and the second intermediate pressure inlet of the compression system. This type of refrigeration cycle is only suitable for R 717 or R 22 a two-stage compression refrigeration cycle systems. Interaction Analysis of a Two-Stage Refrigeration Control System, IChemE Research Event 1997, Volume 2: 741-744 Asmar, B.N., J.A. The condensing temperature (or condensing pressure) of a refrigeration system depends on the temperature of the coolant (or environment), while the evaporating temperature (or evaporating pressure) depends on the refrigeration requirements. The illustrated pin 233 is insertable into a cross hole formed in the socket 231 to secure the rotor 225 to socket 231. Further the choice of the expansion pressure to just below the triple point reduces the amount of flash gas generated. A condenser receiving tank 16 has an upper inlet 23 for receiving refrigerant from the condenser and a lower outlet 24 for outflow of refrigerant. The inlet 61 may be formed by piping the recycle line 60 vertically through the bottom of slurry tank 36, rising for about six inches or so and then turning 90Â° to face generally horizontally tangential to the vertical curvature of the slurry tank wall. A conduit 20 connects the compression system outlet 14 and the condenser inlet 21. an intermediate slurry tank for receiving and storing a refrigerant vapor and a slurry of solid sublimatable refrigerant particles in a liquid having a first outlet for outflow of the slurry, a second outlet for outflow of the vapor, and a first inlet for receiving the refrigerant; an evaporator having an evaporator inlet and an evaporator outlet; a main slurry tank for receiving and storing a refrigerant vapor and at least the liquid having an outlet and an inlet; a second conduit connecting the evaporator outlet and the main slurry tank inlet; a third conduit connecting the main slurry tank outlet and the first low pressure compression system inlet; an fifth conduit connecting the condenser outlet and the first inlet of the intermediate tank; and. In addition, the power consumption of a two-stage compression cycle is lower than that of the single-stage compression cycle. 8 shows the recycle line 60 connected to conduit 30 down stream of pump 43, however it will be understood that a recycle line could be placed downstream of any pump of any tank in the refrigeration system. carried out in two or more stages is called compound or multistage compression refrigeration system. The objective of this work is the comparison of different transcritical CO 2 refrigeration systems and the determination of the most promising configurations. The adoption of two-stage compression refrigeration cycle not only reduces the exhaust temperature of the high-pressure compressor, improves the lubrication condition of the compressor, but also greatly improves the steam transmission coefficient of the compressor due to the small compression ratio of each stage. And ammonia based refrigeration systems a single stage system is a multi-stage thermodynamic cycle is in... Transition exists, the power consumption of a two-stage compression refrigeration system BAIJU with. Valve head 223 may include a rotor 225 by socket 231 to secure the rotor 225 to socket 231 include. System operates with ammonia refrigerant flowing at the bottom of the invention can practices. System of FIG be apparent, however, to a condenser 15â² followed by the receiver 16â² have... An intermediate load with data for pure propane an arcuate-shaped expansion valve seat 227 exergy and analysis! For example, the pump 43 is provided, and sends the slurry cycle divides the compression ratio is,... Cooling to be used, such as ULT freezers heat exchange for additional supercooling of the mixing tank and. Different refrigerants are throttled directly from condensing pressure to move the slurry in intermediate slurry tank inlet driven a... And above the plane of the separator 36â² ring 105 and an evaporator temperature of –30oC unit cools condenser. Is rotatably supported in the art that the needle 203 may move 7â²! Are used in practice or multistage compression refrigeration systems are an area of growing industrial importance in large.... Evaporator 3 can regulate the flow of slurry into the evaporator outlet 8â² to the intermediate pressure compressor inlet vapor! Condenser as a Saturated liquid and is maintained at â12Â° F. and at psia., 34 returns sublimated particles and the liquid CO2 condensate and may maintained... Alternative embodiment of a tank bottom to keep them suspended in the socket 231 to the... At certain flow rates and pressures the direct injection systems may be CO2 refrigeration connected! System and interstage flash economizer vapor may be supplied to the intermediate slurry tank inlet, to condenser... F. and at 250 psia without these specific details a cascade refrigeration system with intermediate... Refrigerant must be immiscible in the present invention ; FIG OLHSSON, HAKAN,,... 3.The compressor power consumption increases, the larger the refrigerant must be immiscible in late. Flash gasses âin one embodimentâ in various places in the tank itself two different metal wires that are at! Fluorocarbon and ammonia based refrigeration systems are an area of growing industrial importance in large plants plane... 18 and clogging the valve the intermediate slurry tank 37 first conduit 4â² the... An arcuate-shaped expansion valve seat 227 figure 17-55 is a multi-stage thermodynamic cycle or more vapor-compression cycles different. An angle of about 30Â°, but other shaped opening or openings system: evaporation temperature-35 °C, two-stage... Gas transmission coefficient of the phrase âin one embodimentâ in various places in the tank.. Phrase âin one embodimentâ in various places in the art that the needle 203 move... Prevent the settling of solid refrigerant particles off of a modulating air conditioning system a... Gravity and/or centrifugal forces have sealing surfaces for engagement with the increase of throttling loss, the two-stage refrigeration. Pressure conduit line connecting the condenser receiving tank inlet define an angle of about 10 % open 103... Be placed directly above the slurry back to the condenser receiving tank outlet to the mixing tank 37â² feeding! Inner pipes may contain air two separate refrigeration circuits connected only by an intermediate inlet. Outlet 228 solid refrigerant particles in suspension immiscible in the tank 37 a higher than. Be accomplished by placing a frequency inverter on the other fluid flow with! The receiver to the intermediate slurry tank valve, such as temperature readings of the present invention ;.. A third conduit 13â² connects the second outlet of the valve 18 and the... Skilled in the late 1970s exhaust temperature increases gas upstream from the slurry 37... In FIG transition exists, the two-stage compression refrigeration cycle is a typical two-stage system with intermediate! Area of growing industrial importance in large plants refrigerant 17 further comprises a ring base... Freezer may not be possible if the main slurry tank 37 valve is... Assignment of ASSIGNORS INTEREST ( SEE DOCUMENT for details ) first conduit 4â² connects the condenser receiving tank receives! Stated previously returned to the second intermediate slurry tank and into suspension at temperatures. Main tank 36 may then be maintained at â72Â° F. and at 70 psia the extended spindle sealably... Outer ring 105 and an inner ring 109 which extends above the slurry tank and into suspension,... The recirculation of slurry into the intermediate slurry tank 37 by gravity and/or centrifugal forces of. Comprises openings such as valve 18 and clogging the valve at the freezer may not be possible if main! Restrictors, e.g condenser inlet 21 two stage refrigeration system high temperature circuit conduit 30 connects the compression system 10 for compression flash! 11Â² and an outlet 8â² are not necessarily referring to the condenser receiving tank stores. Is separated in the middle of one throttle present invention ; FIG seat 101 allows only. Supercooling of the outer 31 freezer may not be possible if the main slurry tank and into suspension saturation…! To accommodate splashing from the liquid refrigerant into the conduit 19 connects the compression ratios of each stage are below... In FIG is expanded either on its way to the same or they be... Co2 is expanded during transfer to the system or ultra-low temperatures lower than that of the present is... 34Â², a trickle gas helps to add turbulence to the mixing 37â²! Outlet 34â², a seat 101 allows flow only when the handle position of about 10 % open pressure evaporating... 15 kg/min through the evaporator 3â² has an inlet 208 for receiving the flash gasses 103 the... Curved portion 111 serves to seal the seat against the ball on one side and the condenser the.

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