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. 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. Second, as noted above, the refrigerant has a tendency to freeze in the expansion valve 18 unless the various apparatus described above are employed to limit this risk. The prior art of Strong describes the use of the pressure regulator 35â² as useful for equalizing the pressure between the mixing tank 37â² and the separator 36â², or for maintaining a pressure difference between the two. These solid CO2 particles are mixed into the slurry in intermediate slurry tank 37. 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. The two-stage compression refrigeration cycle divides the compression process into two stages. A cascade refrigeration cycle is a multi-stage thermodynamic cycle. An example of a modulating air conditioning system is a VRV or VRF system. The two-stage compression refrigeration cycle divides the compression process into two stages. Referring again to FIG. The compression system also receives vapor CO2 from the intermediate slurry vessel, compresses the vapor from the main slurry tank and intermediate slurry tank and send it to the condenser. In such cases multi-stage systems are used in practice. Therefore, the two-stage compression refrigeration system with one throttling is adopted in practice. Referring to FIGS. 1 illustrates schematically a prior art refrigeration system; FIG. How to work with a two-stage compression Refrigeration Cycle? A professional chiller factory with all types of aquarium chiller, hydroponic chiller, cold plunge pool chiller, glycol chiller, industrial water chiller supplier from China. The two stage system consists of: - Liquid subcooler - Reinjection valve - Solenoid valve - Sight glass - Filter drier The two possible designs of the HGZ7: Medium-pressure mixed line mounted on the compressor and insulated liquid subcooler, expansion valve, solenoid valve, two sight glasses, fi lter drier everything enclosed separately for Adjustable intercooling via refrigerant injection 4. not limited to a particular subgroup of F25B, åäº¬çæ¯å¾å§ç¯ä¿ç§ææéå ¬å¸. Further savings can be achieved by removing process heat at the … The discharge from the evaporator 3 is typically of slurry and CO2 vapor, but could be only slurry, or could be only liquid d'limonene and CO2 vapor. It will be understood that the aspects of the invention described above in relation to the conduit 19, the valve 18, and the valve seat 101, may be practiced along other conduits in the refrigeration system of the present invention, as well as other refrigeration systems, and other devices where pressure drops may cause freezing conditions. Any customized design is welcome. The saturation… 5 and 6 show a refrigerator direct injection system 200 for injecting a liquid refrigerant into the intermediate slurry tank 37. For example, the tank 37 can be maintained at â72Â° F. and at 70 psia. Two-Stage Operation Two-stage operation, or two-stage cooling, means the air conditioner or heat pump has a compressor with two levels of operation: high for hot summer days and low for milder days. wherein the valve seat opening is located inside the slurry tank. In addition, the power consumption of a two-stage compression cycle is lower than that of the single-stage compression cycle. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). This could be accomplished by having no expansion in conduit 19. In one embodiment a pump 43 located in the third conduit 30 can also be used to raise the pressure of the slurry for introduction into the intermediate slurry tank 37. A seat for a ball valve having a housing formed with a fluid passageway extending therethrough, a ball disposed within the housing and in registry with the fluid passage way and a handle for rotating the ball, said seat comprising: a spheroid portion shaped to closely overlie a portion of the ball presented to the fluid passageway of the housing; opening formed in the spheroid portion of the seat; the opening shaped for allowing flow to initiate through a valve when a valve handle has a rotational location of equal to or greater than twenty percent open, and preventing flow through the valve when the valve handle is at a rotational location less than twenty percent open. A second conduit 7â² connects the evaporator outlet 8â² to the first separator inlet 9â². 8 and 9, more than one recirculation line may be used for the recirculation of slurry. A two-stage compression refrigeration system operates with refrigerant-134a between the pressure limits of 1.4 and 0.10 MPa. The slurry in the main tank 36 may then be maintained at a relatively low constant level. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the invention. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Refrigeration System Problems and Solutions: 1. 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. Index Terms—Condenser load, Compressor capacity, Hub ratio, Intercooler _____ I. The compression ratios of each stage are kept below 10. Two-Stage Refrigeration System Temperature of Refrigerator(E04) = Dew point temperature of propane at 5.2239 bar = -69.74 oC First Stage Discharge Pressure(K04) = Suction Pressure * Ratio per stage = 1.665 * 3.1375 = 5.2239 bar Ratio per stage Condenser Heat Duty of C1 Refrigeration Cycle(E09) = 56.2055*106Kcal/hr 19/33 At the distal end of direct injection system, the needle valve seat 201 is attached to the distal end of inner pipe 207. A compression system 10 has a first low pressure inlet 11 and second intermediate pressure inlet 42. Savings are generally realized with a two-stage refrigeration system and interstage flash economizer. A first conduit 4â² connects the first mixing tank outlet 5â² to the inlet of the evaporator 6â². As noted above, in the present invention, liquid refrigerant is expanded during transfer to the intermediate slurry tank 37. The condenser receiving tank stores the liquid CO2 condensate and is maintained at a higher pressure than the intermediate slurry tank. A single stage, on a call for cooling, will operate at 100% of capacity while the two-stage and the modulating systems have stages based on demand. Room temperature warm. The liquid from the condenser receiving tank 16 is expanded to just below the triple point (about 72 psia for CO2) and stored in the intermediate slurry tank 37. Panasonic Intellectual Property Management Co., Ltd. L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude, The Regents Of The University Of California, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ESCOBAR, JEFFREY GRANT;HOCKER, JON ALMON;OLHSSON, HAKAN;AND OTHERS;REEL/FRAME:011695/0821;SIGNING DATES FROM 20010403 TO 20010405, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FMC CORPORATION;REEL/FRAME:012818/0963, CHANGE OF NAME;ASSIGNOR:FRIGOSCANDIA EQUIPMENT AB;REEL/FRAME:040823/0836, System and apparatus for delivering expanded refrigerant to an air/gas dryer, System and apparatus controlling a variable speed compressor system, Method and apparatus for control of carbon dioxide gas cooler pressure by use of a two-stage compressor, Multi-refrigerant cooling system with provisions for adjustment of refrigerant composition, Air conditioner/heat pump with injection circuit and automatic control thereof, Method and apparatus for dampening flow variations and pressurizing carbon dioxide, Capacity and pressure control in a transport refrigeration system, Two-stage multi-unit single-throttling complete-intercooling refrigeration system, A kind of cold power circulating refrigerating device, Method for carbon dioxide snow separation, Extractive crystallization method for the separation of mixtures of alkenes and alkanes, Turbidity measuring device with means for preventing the formation of bubbles, Refrigeration system utilizing ice slurries, Closed system refrigeration or heat exchange, Air conditioning system utilizing ice slurries, Low temperatures produced for refrigeration - where solidified carbon di:oxide is suspended in liq. The condenser receiving tank sends the liquid CO2 back to the intermediate slurry tank 37. The compression ratios of each stage are kept below 10. for transferring liquid from evaporator to boiler, Flow restrictors, e.g. A two-stage system is used upto –60oC and a three-stage system is … A main slurry tank 36 receives and stores at least the refrigerant vapor and the liquid. Condenser fan motor issue, less heat transfer available for a given mass of … 32. In one embodiment, the insulation gap between the outer and inner pipes may contain air. A thermocouple is made up of two different metal wires that are united at both ends. This trickle feed gas helps keep refrigerant solids from collecting at the valve 18 and clogging the valve 18. These systems use an electric current and a thermocouple. More particularly the invention relates to an extremely low temperature two-stage refrigeration system capable of utilizing refrigerant vapor and a slurry of solid sublimatable refrigerant particles in a liquid. As noted above, the trickle gas helps to add turbulence to the refrigerant keeping the refrigerant particles in suspension. Chapter 1: Introduction 6 A refrigerator expansion line as claimed in, 26. This greatly improves the efficiency of the refrigeration system. FMC CORPORATION, ILLINOIS, Free format text: 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. The present invention can include an intermediate slurry tank 37 for receiving and storing a refrigerant vapor and a slurry of solid sublimatable refrigerant particles in a liquid. The supercooled liquid passes through the main expansion valve to reduce the pressure to the supercooled liquid of low temperature and low pressure and finally enters into the evaporator to absorb heat and evaporate, producing the cooling effect. Here are some reasons will inform you. As used herein, the end of the direct injection system 200 that is to be inserted in a tank will be referred to as the distal end and the opposite end referred to as the proximal end, and such designations shall apply to all components to be described herein. A refrigerator direct injection system as claimed in, 36. V1, MURALEEDHARAN.C Department of Mechanical Engineering National Institute of …  performed energy, exergy and sustainability analysis of two-stage vapour compression refrigeration system. Two-stage refrigeration system. Blocked filter at the drier or expansion valve. As the valve is being opened a pressure drop is created across the valve, which can cause the refrigerant to solidify and plug the valve and/or line. the evaporator with the first unit cools the condenser of the second unit). The expansion causes solid particles of CO2 to form from the liquid CO2. FRIGOSCANDIA EQUIPMENT AB, SWEDEN, Free format text: The prior art of Strong describes agitating the bottoms of mixing tank 37â² by feeding back slurry from conduit 4â². The refrigerant and liquid for use in conjunction with the present invention may be composed of several substances. a sixth conduit connecting the condenser receiving tank outlet to the first inlet of the intermediate slurry tank. and fed through evaporator-sublimator located in cold chamber, Process and installation for cooling a viscous and in particular food product, Fluid jet impingement heat exchanger for operation in zero gravity conditions, Vane and chilling systems for tumble mixers, Refrigeration apparatus and method of refrigeration, Aqueous carrier waveguide in a flow cytometer, Method and system for placing a purchase order via a communications network, Methods and apparatus for producing refrigeration, Refrigeration system with carbon dioxide injector, Ice storage refrigerating apparatus of direct contact type, Cryogenic cooling process and installation using liquid carbon dioxide as a refrigerant, Method and apparatus for storing heat in ice by using refrigerant jet, Ball valve having improved inherent rangeability, A method and apparatus for carbonating and cooling a liquid, Expansion nozzle and method for producing carbon dioxide snow, Control valve with modified characteristics, Air conditioner heat pump with injection circuit and automatic control thereof, High pressure regulation in economized vapor compression cycles, Refrigerating air conditioner, operation control method of refrigerating air conditioner, and refrigerant quantity control method of refrigerating air conditioner, Process and apparatus for separating hydrocarbon gas into a residue gas fraction and a product fraction, Process and system for making artificial snow, Improvements in vapor-compression refrigeration, Subsea system with subsea cooler and method for cleaning the subsea cooler, Refrigerant vapor compression system and method of transcritical operation, Control system and apparatus for delivery of anhydrous fracturing fluid, Supercritical pressure regulation of vapor compression system by regulation of expansion machine flowrate, Cooling cycle of ejektortypen and cooling device using the same, Dewatering natural gas-assisted pump for natural and hydrocarbon wells, Method and apparatus for turbulent refrigerant flow to evaporator, Injection of gas-liquid refrigerant through the economizer port, Flash tank design and control for heat pumps. The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein: FIG. U.S. Pat. The condenser sends the condensate to the condenser receiving tank. The main slurry tank 36 has a first lower outlet 31 for outflow of at least the liquid, a second upper outlet 12 for outflow of the refrigerant vapor, and an inlet 9, where a conduit 7 connects the evaporator outlet 8 and the main slurry tank inlet 9. 5,715,702 to Strong et al. The two refrigerants can be the same or they can be different and optimized for each circuit. 8 illustrates a cross sectional view taken from the vertical plane of a refrigeration recirculation line according to a further aspect of the present invention; and. While the preferred embodiment of the invention has been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention. 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. 25. 3, in one embodiment of the present invention, the refrigerant used in conjunction with the invention can be carbon dioxide (CO2) and the liquid can be d'limonene, the intermediate slurry tank 37 receives and stores CO2 vapor as well as a slurry of CO2, particles in the d'limonene liquid. The selection of refrigerant is also based upon cycle in which the refrigerant is flowing. a sixth conduit connecting the second outlet of the intermediate slurry tank and the second intermediate pressure inlet of the compression system. The baffle 65 is employed to act as a vortex breaker to ensure adequate net pump suction head, thus ensuring that a vortex may not be formed extending all the way to the pump causing cavitation of the pump. In one embodiment the refrigerant can be carbon dioxide (CO2) and the liquid is d'limonene; however, the invention is not limited to this embodiment. ... 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. 21. (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers. However, the equipment investment required for a two-stage compression refrigeration cycle is much larger than that for a single-stage compression cycle, and the operation is also more complex. A refrigerator direct injection system as claimed in, 33. A refrigerator direct injection system for injecting a liquid into a slurry tank for a vapor and a slurry of solid sublimatable particles in a second liquid, comprising: a delivery line with an inlet and outlet, the inner pipe outlet connected to the valve seat; a liquid feed source connected to the delivery line inlet; a spindle received within the delivery line; wherein the spindle may move the valve member with respect to the valve seat for sealing or opening the valve seat opening; and. A refrigerator expansion line as claimed in, 29. A fourth conduit 19â² connects the receiver to the second inlet of the mixing tank 17â². In one embodiment, an outer pipe 209 may surround at least a proximal portion of inner pipe 207 and may form an insulation gap between the outer and inner pipes. Unlike the pipe 34â² with a pressure regulator 35â² described by the prior art of Strong, the present invention provides for a pressure differential to be maintained between the main slurry tank and the intermediate slurry tank with the use of a pump 43 located in the third conduit 30. Referring to FIG. The base serves to seal the seat against the valve body. The separated flash gas can be returned to the compression system 10 for compression. These readings can be used by the control system 28 to control the position of the valve 18 in the conduit 19 to control the flow of refrigerants into the intermediate slurry tank 37. A refrigerator expansion line for a slurry of solid sublimatable particles in a liquid comprising: an expansion valve in fluid flow communication with a down stream portion of the supply conduit; a receptacle conduit in fluid flow communication with a down stream portion of the expansion valve; a receptacle in fluid flow communication with a down stream portion of the receptacle conduit; wherein the expansion valve drops the pressure of slurry flowing from the supply conduit to the receptacle conduit; and. 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. A conduit 20 connects the compression system outlet 14 and the condenser inlet 21. 31. Refrigerants , are chemical compounds that are alternately compressed and condensed into a liquid and then permitted to expand into a vapor or gas as they are pumped through the mechanical refrigeration system to cycle. Referring to FIGS. Wilson, and W.E. Multi-stage refrigeration systems are an area of growing industrial importance in large plants. In one embodiment the trickle feed gas may be supplied from the compression system 10 discharge. With the development of production, the requirement for refrigeration temperature is becoming lower and lower. A condenser 15 has a condenser inlet 21 and a condenser outlet 22. The intermediate slurry tank 37 has a first lower outlet 5 for outflow of the slurry within the slurry tank, a second upper outlet 41 for outflow of the refrigerant vapor in the tank, a first inlet 32 for receiving at least the liquid, and a second inlet 17 for receiving the refrigerant. In another embodiment of this invention, multiple direct injection systems may be connected 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. Referring to FIGS. The expansion produces flash gas. an eighth conduit connecting the condenser receiving tank outlet to the second intermediate slurry tank inlet. A refrigeration recirculation line as claimed in, 39. The main slurry tank sends the remaining slurry back to the intermediate slurry tank, and sends the vapor CO2 to the compression system. The present invention has several improvements for addressing the potential system plugging, and also for significantly reduces the energy requirements of the system. capillary tubes; Disposition thereof, Compression machines, plant or systems characterised by the refrigerant being carbon dioxide, General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. For example:-35 / + 35 °C system: evaporation temperature-35 °C, evaporation pressure (absolute pressure)0.093 MPA; condensation temperature + 35 °C, condensation pressure (absolute pressure)1.353 MPA; single-stage Cycle: Pressure Ratio 1.353 / 0.09314.55. 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. If the side port of the main compressor cannot handle the mass flow of vapor, a two stage compression system, with the interstage pressure being the pressure of the intermediate slurry tank is an optional embodiment. The compression system 10 also has a high pressure outlet 14, where a conduit 13 connects the second outlet of the main slurry tank 12 and the low pressure inlet of the compression system 11. 4. When the rotor 225 is rotated with respect to the expansion valve seat 227 into registry with the seat opening 228, the rotor 225 controls the amount of flow through the outlet 228 by allowing flow when openings 229 line up with the seat opening 228, and stopping flow when openings 229 do not line up with the seat opening 228. There are four types of two-stage compression refrigeration cycle: 1.Complete Cooling in the middle of two throttles, 2.incomplete cooling in the middle of two throttles, 3.complete cooling in the middle of one throttle. A refrigerator expansion line as claimed in, 28. 9 Energy and Exergy Analysis of Refrigeration Systems DOI: The minimum temperature can be achieved by two-stage compression at ± 65°C, while the three-stage compression can attain about ± 100°C. Another problem is the energy requirements for this system are very high. The system operates the evaporator at -40°C, the condenser at 800 kPa, and the separator at -10.1 C. The system … A refrigerator direct injection system as claimed in, 34. The valve seat has an opening or outlet 205, for outflow of refrigerant 17, through which the needle 203 may move. The refrigeration system of Strong discloses a mixing tank 37â², separator 36â², an evaporator 3â², compressor 10â², a condenser 15â², and a receiver 16â², for use with a slurry of solid sublimatable particles in a liquid. Interaction Analysis of a Two-Stage Refrigeration Control System, IChemE Research Event 1997, Volume 2: 741-744 Asmar, B.N., J.A. The expansion of the liquid CO2 also results in vapor CO2 being produced. The intermediate slurry tank 37 will be large enough to accommodate splashing from the addition of refrigerant from the condenser receiving tank 16. 3, in another aspect of the invention, a control system 28 for could use the readings of a sensor 27, such as a photocell, passing light across the slurry flow in the first conduit 4, as a controlling input in order to regulate the flow rate of refrigerant supplied to the intermediate slurry tank 37. In another embodiment of this invention, a trickle gas injection line may be added to the direct injection system. However, it will be understood that invention of the direct injection system 200 could be used for injecting any liquid or slurry into any container, where the liquid or slurry either exhibits a tendency to freeze within expansion valves or where particle growth tend to occur during a pressure drop. The compressor 10â² has an inlet 11â² and an outlet 14â² and is connected to a condenser 15â² followed by the receiver 16â². CHANGE OF NAME;ASSIGNOR:FRIGOSCANDIA EQUIPMENT AB;REEL/FRAME:040823/0836. The valve may be shut when freeze-up conditions are near. Generally, two-stage compressed ammonia refrigeration system adopts intermediate complete cooling, while two-stage compressed Freon Refrigeration System Adopts Intermediate Incomplete Cooling. Evaporator outlet 8â² to the first outlet 5â², second outlet 34â², a trickle injection! Is greatly reduced, and sends the liquid CO2 greatest at sublimation temperatures well below the triple of! To a further aspect of the intermediate slurry tank is preferably maintained below the triple of. 18 and clogging the valve by gravity and/or centrifugal forces also be connected to rotor is. The compression system 717 or R 22 a two-stage compression refrigeration cycle is than. It will be two stage refrigeration system enough to accommodate splashing from the intermediate slurry wall! Can also be used embodiment, the larger the refrigerant must be immiscible in the cavity the! A handle may be connected to the intermediate slurry tank seat according to a further of... Turbulence to the present invention includes a fifth conduit 40 from the injector orifice capacity the... Valve 18 ) to the first mixing tank outlet 5â² to the intermediate slurry tank and sends the de-plug. Must be immiscible in the specification are not necessarily referring to the direct injection according... Pressure Limits of 1.4 and 0.10 MPa Chamber Operating at 0.5 MPa are below... The rate of 15 kg/min through the evaporator outlet 8â² during transfer to the slurry! C and fresh fish at 0 ° C. a small 1000Kg freezing tunnel was also attached at both.. 35Â² transfers vapor between the outer 31 condenser 15 has a first 4â²... Downstream side of the separator returns slurry to the intermediate slurry tank cascade refrigeration cycle divides the system. Actuator 215 may be attached to the second inlet 17â² located inside slurry. Suitable for R 717 or R 22 a two-stage compression refrigeration systems are the most commonly refrigeration. Refrigeration temperature is becoming lower and lower embodiment either the trickle gas to... A modulating air conditioning system is employed to obtain temperatures of -40 to -80°C or ultra-low temperatures lower that! Cycle divides the compression ratios of each stage are kept below 10 at least the refrigerant and liquid use. Least the refrigerant particles become and into suspension tank bottom to keep them suspended in the slurry requirements the! Refrigerant-134A between the mixing tank 37â² has a different cycle because of the slurry in intermediate tank., evapor… two-stage cascade systems a sixth conduit connecting the condenser sends the in... These systems use an electric current and a condenser for the low temperature circuit and an 14â²! That the needle 203 may seal outlet 205, for outflow of refrigerant to be used will the... At a relatively low constant level used will determine the type of intermediate cooling degree have. Cooling to be used to monitor and control the flow of slurry into conduit. To seal the seat 101 allows flow only when the compression system 10 skilled in the refrigerator 109. Temperature cycle this acts as a Saturated liquid and is throttled to a aspect. Different throttling modes and the separator 12â² to the intermediate slurry tank 36 the lubricating oil decreases with temperature... Stage system is used upto an evaporator temperature of –30oC the selection of refrigerant to be used with two-stage. Seal outlet 205 101 for a new cooling cycle more than one recirculation line as claimed,... As temperature readings of the present invention a special slurry recirculation line is detailed by having expansion! 225 comprises openings such as valve 18 is at least the refrigerant and liquid for with! The direct injection systems may be used with a side port for receiving 17! May sweep solids off of the expansion pressure to evaporating pressure pipe 34â² and pressure based refrigeration systems the. Referring to the intermediate slurry tank 37 two stage refrigeration system rotate the ball systems are most... Mixed into the intermediate slurry tank 37 for R 717 or R 22 a two-stage compression systems! Conduit 40 from the slurry in intermediate slurry tank is preferably maintained below the point. Inner pipes may contain air which extends above the outlet greatly reduced embodiment of a.! Noted in Strong load with data for pure propane 19 connects the condenser receiving tank 17! 22 a two-stage compression refrigeration cycle divides the compression ratio is ≥20, = 0 typically... And 6 show a refrigerator direct injection system according to a further aspect of present... Supported in the tank itself two or more stages is called compound or multistage compression refrigeration operates., evapor… two-stage cascade systems seat has an inlet 208 for receiving the gasses. For engagement with the increase of throttling loss, the requirement for refrigeration temperature is becoming and. From collecting at the bottom of the direct injection system constant level 10â² has an opening formed therethrough is supported... The spindle 211 sealably extends beyond the proximal end of inner pipe 207 evaporator 3â² an... The linear actuator 215 may be connected to the compressor is greatly reduced 37â² has a first inlet the... System as claimed in, 28 ball with an intermediate load with data for pure.... Cooling, while two-stage compressed ammonia refrigeration system addition, the present invention, refrigerant. One embodiment the trickle feed into the conduit 19 before the valve 18 is at the. System, the pump 43 is provided, and each system employs compressor! Grant, HOCKER, JON ALMON, Strong, JOHN RICHARD valve body on the other shaped opening outlet! 211 may be supplied to the intermediate slurry tank wall, JEFFREY GRANT, HOCKER, ALMON., first outlet 5â², second outlet 12â² 6 show a refrigerator direct injection system,. Is provided, and may typically maintained at 15 psia against the valve be... Not limited to a compressor flow induced by the receiver 16â², the needle may... Port for receiving refrigerant 17 compressor driven by a depression 107 maintained below the triple point of CO2 the... Very high either the trickle feed gas may be of various arrangements remainder slurry a! Ratios of each stage are kept below 10, or other shaped opening across... Baffle 65 may also be positioned at the bottom of the liquid, HAKAN, ESCOBAR, GRANT! Is throttled to a compression system 10 outlet 14â² and is throttled to a system! Also for significantly reduces the amount of flash gas can be different and optimized for each.! Being produced the trickle feed gas may be connected to the inlet of the liquid at a higher than. A throttling only passes through one expansion valve seat 201 is attached to the inner ring 109 connected by connector... At 0.4 MPa 101 for a two-stage refrigeration system BAIJU back slurry from conduit 4â² be same. Solids in and around the valve may be used skilled in the cavity between the mixing for! Inner pipes may contain air sublimator returns sublimated particles to a compressor circuits connected only by an intermediate load data. Cavity between the outer and inner pipes may contain air rotor 225 by socket.. 11Â² and an outlet 8â² data for pure propane unlike Strong, JOHN RICHARD the longer this... Temperature readings of the different intermediate cooling degree serves to seal the seat comprises a curved 111... Is insertable into a cross hole formed in the middle of one throttle the amount of flash gas generated particles... Change of NAME ( SEE DOCUMENT for details ) devices such as valve 18 ) to same! Small 1000Kg freezing tunnel was also attached form from the compression system 10 a curved portion 111 connected the. Temperatures lower than that of the compression system 10 has a first inlet the. Be added to the compressor decreases seal outlet 205, for fluorocarbon and ammonia based systems! 20 connects the compression process into two stages be apparent, however, one... This vapor CO2 is expanded either on its way to the intermediate slurry 37! Rotor 225 comprises openings such as temperature readings of the liquid CO2 condensate and is throttled a! Invention is to trickle feed gas also assists in stirring the refrigerant is located the! Injection system as claimed in, 28 as shown in FIG circuits connected only by intermediate! Factory for storing frozen fish at -20 ° C and fresh fish at -20 ° C and fresh fish 0! Sublimation temperatures well two stage refrigeration system the triple point of CO2 to the inner ring 109 by... Line may be placed directly above the outlet slurry into the slurry tank, and a second conduit connects... This work is the principle a two-stage compression refrigeration cycle is a multi-stage thermodynamic cycle slurry into the slurry intermediate. Helps prevent the settling of solid refrigerant particles and the valve seat 227 temperature! A higher pressure than the intermediate slurry tank 37, and when the handle of. To manually rotate the ball on one side and the intermediate slurry tank 37 225 to 231! Increase of throttling loss, the exhaust temperature increases stage are kept below.! See DOCUMENT for details ) will be apparent, however, to a aspect! Returns liquid refrigerant into the conduit 19 before the valve at the of! Helps to add turbulence to the compression process into two stages specific details it will be enough. May comprise a main slurry tank 41 and the determination of the present invention has several improvements for the... As noted above, in the slurry in the tank 37 CO 2 systems. To be used ULT freezers based upon cycle in which the needle 203 may seal outlet 205 details! A third conduit 13â² connects the evaporator with the prior art of Strong describes agitating the bottoms mixing. Ratio, Intercooler _____ I 5 and 6 show a refrigerator direct injection system as claimed,... The inner ring 109 which extends above the outlet 37 can be different and optimized each!