DK202200912A1 - CO2 Heat Pump System or CO2 Refrigeration System Comprising an Ejector Assembly and Method for Controlling an Ejector As- sembly of a CO2 Heat Pump System or a CO2 Refrigeration System - Google Patents

CO2 Heat Pump System or CO2 Refrigeration System Comprising an Ejector Assembly and Method for Controlling an Ejector As- sembly of a CO2 Heat Pump System or a CO2 Refrigeration System Download PDF

Info

Publication number
DK202200912A1
DK202200912A1 DKPA202200912A DKPA202200912A DK202200912A1 DK 202200912 A1 DK202200912 A1 DK 202200912A1 DK PA202200912 A DKPA202200912 A DK PA202200912A DK PA202200912 A DKPA202200912 A DK PA202200912A DK 202200912 A1 DK202200912 A1 DK 202200912A1
Authority
DK
Denmark
Prior art keywords
gas
ejectors
predefined
port
outlet port
Prior art date
Application number
DKPA202200912A
Inventor
Skaarup Nielsen Jacob
Gardø Christensen Kim
Holst Nielsen Mads
Lund Rasmussen Jonas
Original Assignee
Fenagy As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fenagy As filed Critical Fenagy As
Priority to DKPA202200912A priority Critical patent/DK181547B1/en
Priority to EP23200752.6A priority patent/EP4350248A1/en
Priority to CA3215349A priority patent/CA3215349A1/en
Priority to US18/376,936 priority patent/US20240118003A1/en
Application granted granted Critical
Publication of DK202200912A1 publication Critical patent/DK202200912A1/en
Publication of DK181547B1 publication Critical patent/DK181547B1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/08—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using ejectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0012—Ejectors with the cooled primary flow at high pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0013—Ejector control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0015—Ejectors not being used as compression device using two or more ejectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2503—Condenser exit valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/195—Pressures of the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

1. A C0₂ based system (20) being a heat pump system or a refrigeration system is disclosed. The system (20) comprises a plurality of ejectors (2, 2', 2'', 2''') are arranged in parallel. Each of the ejectors (2, 2', 2'', 2''') comprises a motive port (8) and a suction port (20). Each of the ejectors (2, 2', 2'', 2''') has a fixed geometry. A first actuated ball valve (4, 4', 4'', 4''') is arranged in front of the motive port (8). A second actuated ball valve (6, 6', 6'', 6''') is arranged in front of the suction port (10). The system (20) comprises a control unit (12) arranged and configured to control the activity of the ball valves (4, 4', 4'', 4''', 6, 6', 6'', 6''') on the basis of one or more predefined criteria.

Description

DK 2022 00912 A1 1
CO: Heat Pump System or CO: Refrigeration System Comprising an Ejector Assembly and Method for Controlling an Ejector As- sembly of a CO> Heat Pump System or a CO: Refrigeration Sys- tem
Field of invention
The present invention relates to a heat pump or a refrigeration system applying vapor compression and an ejector cycle. The system comprises an ejector assembly as a pumping means for circulating low pressure refrigerant through the ejector cycle.
Prior art
Many prior CO> based heat pumps and refrigeration systems comprise one or more ejectors. An ejector comprises a primary nozzle (also named as motive nozzle), a suction chamber, a mixing chamber and a diffuser. The primary nozzle can be a convergent type or a convergent- divergent type. when the high pressure fluid (known as primary fluid or motive fluid) expands and accelerates through the primary nozzle, it flows out with high speed and hereby create a very low pressure region at exit plane of the nozzle. Accordingly, a pressure difference is created between the streams at the nozzle exit plane and the secondary fluid inlet. Thus, the secondary fluid is drawn through the suction chamber by the entrainment effect. Therefore, both fluids are mixed in the mix- ing chamber and flow through the diffuser hereby converting the kinetic energies of the mixture to pressure energy.
Typical prior art CO> based heat pumps and refrigeration systems com- prise variable ejectors that are configured to change geometry in order to regulate the flow. In these systems, a check valve is arranged next to the suction port of each ejector. The use of check valves is associat- ed to a risk for experiencing fluid leakage because check valves are not leak-tight.
DK 2022 00912 A1 2
Accordingly, it would be desirable to be able to provide an alternative solution that reduces or even eliminates the above-mentioned disad- vantages of the prior art.
Summary of the invention
The object of the present invention can be achieved by a CO; based system as defined in claim 1 and by a method as defined in claim 7.
Preferred embodiments are defined in the dependent subclaims, ex- plained in the following description and illustrated in the accompanying drawings.
The system according to the invention is a CO; based system that com- prises one or more ejectors are arranged in parallel, wherein each of the ejectors comprises a motive port and a suction port, wherein each of the ejectors has a fixed geometry and that: c) a first actuated ball valve is arranged in front of the motive port and d) a second actuated ball valve is arranged in front of the suction port, wherein the system comprises a control unit arranged and configured to control the activity of the ball valves on the basis of one or more prede- fined criteria.
Hereby, it is possible to provide a CO. based heat pump or CO; based refrigeration system, in which the disadvantages of the prior art can be avoided. It is possible to reduce the risk for experiencing fluid leakage.
Moreover, it is possible to achieve an improved efficiency because the resistance induced by check valves used in front of the ports of the ejectors in the prior art can be reduced.
In an embodiment, the system is a heat pump.
In an embodiment, the system is a refrigeration system.
In an embodiment, the system comprises a plurality of ejectors ar-
DK 2022 00912 A1 3 ranged in parallel. In an embodiment, the system comprises three or more ejectors arranged in parallel. In an embodiment, the system com- prises four or more ejectors arranged in parallel.
A motive line is connected to the motive port. By the phrase “in front of the motive port” is meant “in the motive line”.
A suction line is connected to the suction port. By the phrase “in front of the suction port” is meant “in the suction line”.
In an embodiment, the ejectors are high-pressure ejectors designed for high lift applications. Such ejectors are used to achieve the highest pos- sible pressure lift at a lower delivery rate. High-pressure ejectors are suitable for transporting superheated gas.
The system according to the invention is a CO; based system that com- prises one or more ejectors arranged in parallel. If the system compris- es a single ejector only, this ejector is not arranged in parallel. Howev- er, if the system comprises several ejectors, the ejectors are arranged in parallel.
Each of the ejectors comprises a motive port and a suction port.
Each of the ejectors has a fixed geometry. Accordingly, the ejectors are not variable geometry ejectors.
A first actuated ball valve is arranged in front of the motive port and a second actuated ball valve is arranged in front of the suction port.
By the term “ball valve” is meant a shut-off valve. Accordingly, the “ball valve” may be a “butterfly valve”, a “ball valve” another valve that is capable of:
DK 2022 00912 A1 4 a) in a first mode shutting-off a line and b) in a second mode being brought into an open configuration.
In an embodiment, the ball valve is a flow control device comprising a hollow, perforated and pivoting ball to control liquid flowing through it, wherein the ball valve is open when the ball's hole is in line with the flow inlet and closed when it is pivoted 90-degrees by a valve handle, blocking the flow.
The control unit is arranged and configured to control the activity of the ball valves on the basis of one or more predefined criteria. In an em- bodiment, the control unit is connected to the actuators of the ball valves via a wired connection. In an embodiment, the control unit is connected to the actuators of the ball valves via a wireless connection.
In an embodiment, the system comprises: - a liquid-gas separator having an inlet port, a gas outlet port and a liquid outlet port; - a gas cooler having an inlet port and an outlet port; - a high pressure valve arranged between the outlet port of the gas cooler and the inlet port of the liquid-gas separator; - a temperature sensor arranged to detect the temperature of the fluid leaving the gas cooler; - a pressure sensor arranged to detect the pressure of the fluid leav- ing the gas cooler; - an evaporator having an inlet port and an outlet port, wherein the suction ports of the ejectors are in fluid communication with the evaporator, wherein the inlet port of the evaporator is in fluid com- munication with the liquid outlet port of the liquid-gas separator; - a gas-by-pass valve arranged between the gas outlet port of the liquid-gas separator and the evaporator; - an intermediate temperature compressor arranged between the gas
DK 2022 00912 A1 outlet port of the liquid-gas separator and the inlet port of the gas cooler; - a medium temperature compressor arranged between the gas out- let port of the liquid-gas separator and the inlet port of the gas 5 cooler.
Accordingly, by applying a system according to the invention, it is pos- sible not to apply a check valve in front of the suction ports of the ejec- tors to prevent backflow. Therefore, the system according to the inven- tion reduces or even eliminates the risk for experiencing fluid leakage associated to the use of check valves (that are not leak-tight).
In an embodiment, the control unit is configured to detect the opening degree of the high-pressure valve, wherein the control unit is config- ured to open one or more of the actuated ball valves arranged in front of the motive ports of the ejectors if: - the control unit is in operation state and - the opening degree of the high pressure valve is equal to or higher than a predefined level of the opening degree of the high-pressure valve.
In an embodiment, the actuated ball valves are fully opened when they are opened.
In an embodiment, the actuated ball valves are fully closed when they are closed.
The predefined level may be a user defined input. The predefined level would typically be in the range 30-50%, preferably 30-40%. The user will typically provide an input directly to the control unit or indirectly to the control unit via an intermediate device (e.g. a smartphone, tablet or computer).
DK 2022 00912 A1 6
The control unit will typically be configured to determine the opening degree of the high-pressure valve. In an embodiment, the control unit is communicatively (via a wired connection or wirelessly) connected to a detection unit that is arranged and configured to detect the opening degree of the high-pressure valve.
In an embodiment, the control unit is configured to close one or more of the actuated ball valves arranged in front of the motive ports of the ejectors if: - the opening degree of the high pressure valve is equal to or less than a predefined level; - the pressure at outlet port of gas-cooler is equal to or less than a predefined setpoint pressure at the outlet port of the gas-cooler and - the suction ports for the respective ejectors are closed.
In an embodiment, the predefined level is a user defined input. In an embodiment, the predefined level is in the range 7-12 %. In an embod- iment, the predefined level is in the range 8-10%. In an embodiment, the predefined level is 8 bars. In an embodiment, the predefined level is 10 bars.
In an embodiment, the control unit is configured to determine the open- ing degree of the gas-by-pass valve and to open the actuated ball valves arranged in front of the suction ports of one or more of the ejec- tors if: - the motive ports of the one or more of the ejectors are open; - the temperature of the fluid at the outlet port of the gas cooler is within a predefined temperature range; - the suction pressure at the intermediate temperature compressor is within a predefined range; - the opening degree of the gas-by-pass valve is below a predefined level and
DK 2022 00912 A1 7 - the number of actively operated ejectors corresponds to a prede- fined number based on the number of actively operated medium temperature compressors.
It is important to underline that the control unit is configured to open the actuated ball valves arranged in front of the suction ports of one or more of the ejectors only if the capacity of the intermediate tempera- ture compressors is below 100 %. Hereby, it is ensured that suction ports of one or more additional ejector is only opened if the intermedi- ate temperature compressors have additional capacity.
The capacity of the intermediate temperature compressors is below 100 % when the intermediate temperature compressors can provide a high- er capacity. The capacity of the intermediate temperature compressors can be increased by activating an additional intermediate temperature compressor. If three out of four intermediate temperature compressors are active, the capacity is 75%. Accordingly, the capacity of the inter- mediate temperature compressors can be increased by activating the last intermediate temperature compressor so that all four intermediate temperature compressors are active.
In an embodiment, the control unit is configured to determine the open- ing degree of the gas-by-pass valve and to open the actuated ball valves arranged in front of the suction ports of one or more of the ejec- tors if the capacity of the intermediate temperature compressors is be- low 100 %:
In an embodiment, the predefined level is a user defined input.
In an embodiment, the system comprises a temperature sensor ar- ranged to detect the temperature of the fluid at the outlet port of the gas cooler.
DK 2022 00912 A1 8
By securing that the number of actively operated ejectors corresponds to a predefined number based on the number of actively operated me- dium temperature compressors, it is possible to ensure that the number of actively operated ejectors is selected in dependency of the compres- sor capacity.
In an embodiment, the control unit is configured to delay execution of opening and closing of the stop valves for a predefined delay time peri- od within a predefined range. In one embodiment, the predefined delay time period is within the range of 10-120 seconds. In one embodiment, the predefined delay time period is within the range of 15-90 seconds.
In one embodiment, the predefined delay time period is within the range of 20-60 seconds. In one embodiment, the predefined delay time period is within the range of 25-45 seconds. In one embodiment, the predefined delay time period is within the range of 25-35 seconds.
In an embodiment, the control unit is configured to close the actuated ball valves arranged in front of the suction ports of one or more of the ejectors if either of the following constraints are met: - the temperature of the fluid leaving the gas cooler is not within a predefined temperature range limit; - the opening degree of the gas-by-pass valve exceeds a predefined level; - the number of actively operated ejectors exceeds a predefined number, wherein the predefined number is based on the number of actively operated medium temperature compressors.
The method according to the invention is a method for controlling a CO: based system being: a) a heat pump system or b) a refrigeration system, wherein the system comprises a plurality of ejectors are arranged in
DK 2022 00912 A1 9 parallel, wherein each of the ejectors comprises a motive port and a suction port, wherein the method comprises the step of applying ejectors having a fixed geometry, wherein: c) a first actuated ball valve is arranged in front of the motive port and d) a second actuated ball valve is arranged in front of the suction port, wherein the method comprises the step of controlling the activity of the ball valves on the basis of one or more predefined criteria.
In an embodiment, the method applies a system comprising: - a liquid-gas separator having an inlet port, a gas outlet port and a liquid outlet port; - a gas cooler having an inlet port and an outlet port; - a high pressure valve arranged between the outlet port of the gas cooler and the inlet port of the liquid-gas separator; - a temperature sensor arranged to detect the temperature of the fluid leaving the gas cooler and - a pressure sensor arranged to detect the pressure of the fluid leav- ing the gas cooler.
In an embodiment, method comprises the following steps: - detecting the opening degree of the high-pressure valve; - opening one or more of the actuated ball valves arranged in front of the motive port motive ports of the ejectors if: a) the control unit is in operation state and b) the opening degree of the high pressure valve is equal to or higher than a predefined level.
The predefined level may be a user defined input. In an embodiment, the predefined level is within the range 30-50%. In an embodiment.
The predefined level is within the range 30-40%.
DK 2022 00912 A1 10
In an embodiment, one or more of the actuated ball valves arranged in front of the motive ports of the ejectors are closed if: - the opening degree of the high pressure valve is equal to or less than a predefined level; - the pressure at outlet port of gas-cooler is equal to or less than a predefined setpoint pressure at the outlet port of the gas-cooler and - the suction ports for the respective ejectors are closed.
The predefined level may be a user defined input. In an embodiment, the predefined level is within the range 8-12%. In an embodiment, the predefined level is within the range 8-10%.
In an embodiment, the method comprises the step of detecting the opening degree of the gas-by-pass valve, wherein the actuated ball valves arranged in front of the suction ports of one or more of the ejec- tors are being opened if: - the motive ports of the one or more of the ejectors are open; - the temperature of the fluid at the outlet port of the gas cooler is within a predefined temperature range; - the suction pressure at the intermediate temperature compressor is within a predefined range; - the opening degree of the gas-by-pass valve is below a predefined level and - the number of actively operated ejectors corresponds to a prede- fined number based on the number of actively operated medium temperature compressors.
In an embodiment, the method comprises the step of closing the actu- ated ball valves arranged in front of the suction ports of one or more of the ejectors if either of following constraints are met: - the temperature of the fluid leaving the gas cooler is no longer with- in a predefined temperature range limit;
DK 2022 00912 A1 11 - the opening degree of the gas-by-pass valve exceeds a predefined level; - the number of actively operated ejectors exceeds a predefined number, wherein the predefined number is based on the number of actively operated medium temperature compressors.
In an embodiment, the temperature range limit is a user defined input.
In an embodiment, the predefined level (the opening degree of the gas- by-pass valve) is a user defined input. In an embodiment, the prede- fined level (the opening degree of the gas-by-pass valve) is within the range 20-35%. In an embodiment, the predefined level (the opening degree of the gas-by-pass valve) is within the range 25-35%. In an embodiment, the predefined level (the opening degree of the gas-by- pass valve) is 30%.
Description of the Drawings
The invention will become more fully understood from the detailed de- scription given herein below. The accompanying drawings are given by way of illustration only, and thus, they are not limitative of the present invention. In the accompanying drawings:
Fig. 1 shows a schematic diagram of a CO: based system (heat pump) according to the invention;
Fig. 2 shows a schematic diagram of an ejector according to the invention and
Fig. 3 shows a cross-sectional view of an ejector according to the invention.
Detailed description of the invention
Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, a CO; based system 20 of the present invention is illustrated in Fig. 1.
DK 2022 00912 A1 12
Fig. 1 is a schematic diagram of a CO; based system 20 constituting a heat pump 20. The heat pump 20 comprises a gas cooler 24 in fluid communication with an ejector assembly 52 comprising four ejectors 2, 2, 2”, 2". The gas cooler 24 has an inlet port 66 and an outlet port 68.
The ejectors 2, 2, 2”, 2” are arranged in parallel. An outlet line 34 connects the gas cooler 24 and the motive ports of the ejectors 2, 2", 2”, 2". An actuated ball valve 4, 4’, 4”, 4”” is, however, arranged in front of each of the motive ports. It is important to underline that the number of ejectors 2, 2’, 2”, 2” may be selected differently. The num- ber of ejectors 2, 2’, 2”, 2” can be any desired number equal to or larger than one.
The system 20 comprises a temperature sensor 74 arranged and con- figured to detect the temperature of the fluid leaving the gas cooler 24.
In one embodiment, the temperature sensor 74 is also configured to detect the pressure of the fluid leaving the gas cooler 24. In an embod- iment, the system 20 comprises a separate pressure sensor 76 config- ured to detect the pressure of the fluid leaving the gas cooler 24. The pressure sensor 78 may be arranged close to the temperature sensor 74. The pressure sensor may be arranged at the outlet port 68 of gas cooler 24.
The ball valves 4, 4', 4”, 4”” are communicatively connected to a control unit 12. Accordingly, the control unit 12 can control the activity of the ball valves 4, 4’, 4”, 4'” and thus connect and disconnect the connection between the gas cooler 24 and each of the ejectors 2, 2', 2”, 2'” inde- pendently. The control unit 12 is communicatively connected to the temperature sensor 74 and the pressure sensor 76. Accordingly, the control unit 12 receives the temperature measurements made by the temperature sensor 74 and pressure measurements made by the pres- sure sensor 76.
DK 2022 00912 A1 13
The suction ports of the ejectors 2, 2’, 2”, 2'” are connected to a line 36 that is in fluid communication with an evaporator 22 that receives fluid from a liquid-gas separator 14. The liquid-gas separator 14 comprises an inlet port 60, a gas outlet port 62 and a liquid outlet port 64. The evaporator has an inlet port 70 and an outlet port 72.
An expansion valve 30 is arranged at the line 38 extending between the evaporator 22 and the liquid-gas separator 14. The outlet port of each of the ejectors 2, 2’, 2”, 2'” is connected to the liquid-gas separator 14.
An actuated ball valve 6, 6’, 6”, 6” is arranged in front of each of the suction ports of the ejectors 2, 2’, 2”, 2". The ball valves 6, 6’, 6”, 6" are communicatively connected to a control unit 12. Therefore, the con- trol unit 112 is configured to control the activity of the ball valves 6, 6, 6”, 6'” and thus connect and disconnect the connection to the line 36.
The liquid-gas separator 14 has a liquid outlet port that is connected to the line 38. The liquid-gas separator 14 has a gas outlet port that is connected to a line 46. The line 46 is connected to a pressure point 32 via a line 40, in which a gas-by-pass valve 28 is provided. The gas-by- pass valve 28 is a an activated valve. . The suction ports of the ejectors 2, 2, 2”, 2'” are in fluid communication with the pressure point 32. Ac- cordingly, the ejectors 2, 2’, 2”, 2'” have access to gas from the line 40 as well as the outlet port of the evaporator 22.
The heat pump 20 comprises an intermediate temperature compressor 16 that is arranged between the gas outlet of the liquid-gas separator 14 and the inlet port of the gas cooler 24. A line 48 extends between the line 46 and the intermediate temperature compressor 16. A line 50 extends between the intermediate temperature compressor 16 and the inlet port of the gas cooler 24.
DK 2022 00912 A1 14
The heat pump 20 comprises a medium temperature compressor 18 that is arranged between the intermediate temperature compressor 16 and the pressure point 32. A line 42 extends between the medium tem- perature compressor 18 and the line 50.
A high-pressure valve 26 arranged between the outlet port 68 of the gas cooler 24 and the inlet port 60 of the liquid-gas separator 14.
It is possible to apply several intermediate temperature compressors 16 and/or several medium temperature compressors 18 if a higher capaci- ty is needed.
Fig. 2 illustrates a schematic diagram of an ejector 2 according to the invention. The ejector 2 has a fixed geometry and comprises a motive port 8 and a suction port 10. A first actuated ball valve 4 is arranged in front of the motive port 8. A second actuated ball valve 6 is arranged in front of the suction port 10. The CO; based system according to the in- vention comprises a control unit 12 arranged and configured to control the activity of the ball valves 4, 6 on the basis of one or more prede- fined criteria.
Fig. 3 illustrates a cross-sectional view of an ejector 2 according to the invention. The ejector 2 is a high-pressure ejector 2. The ejector 2 comprises a motive port 8 and a suction port 10. The ejector 2 compris- es a nozzle 54, a mixing chamber 56 and a diffuser 58. The nozzle 54 converts the pressure energy of high pressure CO; to the velocity ener- gy in such a manner that the CO: is depressurized and is expanded by the nozzle 54 In the mixing chamber 56, high velocity CO: flow dis- charged from the nozzle 54 draws the vapor phase CO, which has been vaporized in the evaporator (see Fig. 1), into the mixing chamber 56 and is mixed with the vapor phase CO. In the diffuser 58, the CO: dis- charged from the nozzle 54 and the CO, drawn from the evaporator are
DK 2022 00912 A1 15 mixed in such a manner that the velocity energy of the CO, is converted to the pressure energy to increase the pressure of the CO».
In an embodiment, the nozzle 54 has a throttled portion in its passage.
The throttled portion increases the velocity of the CO, which is dis- charged from the nozzle 54. In the mixing chamber 56, the CO: is mixed in such a manner that the sum of the kinetic momentum of the
CO» discharged from the nozzle 54 and the kinetic momentum of the
CO> drawn into the ejector 2 from the evaporator (see Fig. 1) is con- served. Accordingly, in the mixing chamber 56, the static pressure of the CO: is increased.
DK 2022 00912 A1 16
List of reference numerals 2,2, 2", 2" Ejector 4,4’, 4”, 4" Actuated ball valve 6, 6, 6”, 6" Actuated ball valve 8 Motive port
Suction port 12 Control unit 14 Liquid-gas separator 10 16 Intermediate temperature compressor 18 Medium temperature compressor 20 CO: based system (heat pump system or a refrigera- tion system) 22 Evaporator (refrigerant-air heat exchanger) 24 Gas cooler 26 High-pressure valve 28 Gas-by-pass valve 30 Valve 32 Pressure point 34, 36, 38 Line 40, 42, 44 Line 46, 48, 50 Line 52 Ejector assembly 54 Motive nozzle 56 Mixing chamber 58 Diffuser 60 Inlet port (of liquid-gas separator) 62 Gas outlet port (the liquid-gas separator) 64 Liquid outlet port (of liquid-gas separator) 66 Inlet port (of gas cooler) 68 Outlet port (of gas cooler) 70 Inlet port (of evaporator)
DK 2022 00912 A1 17 72 Outlet port (of evaporator) 74 Temperature sensor 76 Pressure sensor

Claims (12)

DK 2022 00912 A1 18 Claims
1. A CO; based system (20) being: a) a heat pump system or b) a refrigeration system, wherein the system (20) comprises one or more ejectors (2, 2°, 2”, 2") are arranged in parallel, wherein each of the ejectors (2, 2’, 2”, 277) comprises a motive port (8) and a suction port (20), characterised in that each of the ejectors (2, 2’, 2”, 2’) has a fixed geometry and that: c) a first actuated ball valve (4, 4’, 4”, 4”) is arranged in front of the motive port (8) and d) a second actuated ball valve (6, 6, 6”, 6”) is arranged in front of the suction port (10), wherein the system (20) comprises a control unit (12) arranged and configured to control the activity of the ball valves (4, 4’, 4”, 4’, 6, 6", 6”, 6'”) on the basis of one or more predefined criteria.
2. A system (20) according to claim 1, wherein the system (20) com- prises: - a liquid-gas separator (14) having an inlet port (60), a gas outlet port (62) and a liquid outlet port (64); - a gas cooler (24) having an inlet port (66) and an outlet port (68); - a high pressure valve (26) arranged between the outlet port (68) of the gas cooler (24) and the inlet port (60) of the liquid-gas separa- tor (14); - a temperature sensor arranged to detect the temperature of the fluid leaving the gas cooler (24); - a pressure sensor arranged to detect the pressure of the fluid leav- ing the gas cooler (24); - an evaporator (22) having an inlet port (70) and an outlet port (72), wherein the suction ports (10) of the ejectors (2, 2', 2”, 2”)
DK 2022 00912 A1 19 are in fluid communication with the evaporator (22), wherein the inlet port (70) of the evaporator (22) is in fluid communication with the liquid outlet port (64) of the liquid-gas separator (14); - a gas-by-pass valve (28) arranged between the gas outlet port (62) of the liquid-gas separator (14) and the evaporator (22); - an intermediate temperature compressor (16) arranged between the gas outlet port (62) of the liquid-gas separator (14) and the in- let port (66) of the gas cooler (24); - a medium temperature compressor (18) arranged between the gas outlet port (62) of the liquid-gas separator (14) and the inlet port (66) of the gas cooler (24).
3. A system (20) according to claim 2, wherein the control unit (12) is configured to detect the opening degree of the high-pressure valve (26), wherein the control unit (12) is configured to open one or more of the actuated ball valves (4, 4’, 4”, 4””) arranged in front of the motive ports (8) of the ejectors (2, 2', 2”, 2") if: - the control unit (12) is in operation state and - the opening degree of the high pressure valve (26) is equal to or higher than a predefined level.
4. A system (20) according to claim 3, wherein the control unit (12) is configured to close one or more of the actuated ball valves (4, 4’, 4”, 4'”) arranged in front of the motive ports (8) of the ejectors (2, 2', 2”, 2") if: - the opening degree of the high pressure valve (26) is equal to or less than a predefined level; - the pressure at outlet port (68) of gas-cooler (24) is equal to or less than a predefined setpoint pressure at the outlet port (68) of the gas-cooler (24) and - the suction ports (10) for the respective ejectors (2, 2’, 2”, 2") are closed.
DK 2022 00912 A1 20
5. A system (20) according to claim 3 or 4, wherein the control unit (12) is configured to determine the opening degree of the gas-by-pass valve (28) and to open the actuated ball valves (6, 6’, 6”, 6") arranged in front of the suction ports (10) of one or more of the ejectors (2, 2/, 2”, 2") if: - the motive ports (10) of the one or more of the ejectors (2, 2’, 2”, 2'”) are open; - the temperature of the fluid at the outlet port (68) of the gas cool- er (24) is within a predefined temperature range; - the suction pressure at the intermediate temperature compressor (16) is within a predefined range; - the opening degree of the gas-by-pass valve (28) is below a prede- fined level, preferably a user defined level; - the number of actively operated ejectors (2, 2’, 2”, 2”) corre- sponds to a predefined number based on the number of actively operated medium temperature compressors (18); - the capacity of the intermediate temperature compressors (16) is below 100 %.
6. A system (20) according to claim 5, wherein the control unit (12) is configured to close the actuated ball valves (6, 6', 6”, 6”) arranged in front of the suction ports (10) of one or more of the ejectors (2, 2’, 2”, 2'”) if either of following constraints are met: - the temperature of the fluid leaving the gas cooler (24) is within a predefined temperature range limit; exceeds (not within) - the opening degree of the gas-by-pass valve (28) exceeds a prede- fined level; - the number of actively operated ejectors (2, 2’, 2”, 27) exceeds a predefined number, wherein the predefined number is based on the number of actively operated medium temperature compressors (18).
DK 2022 00912 A1 21
7. Method for controlling a CO> based system (20) being: a) a heat pump system or b) a refrigeration system, wherein the system (20) comprises a plurality of ejectors (2, 2’, 2”, 2”) are arranged in parallel, wherein each of the ejectors (2, 2’, 2”, 27”) comprises a motive port (8) and a suction port (20), characterised in that the method comprises the step of applying ejec- tors (2, 2’, 2”, 2”) having a fixed geometry, wherein: c) a first actuated ball valve (4, 4’, 4”, 4””) is arranged in front of the motive port (8) and d) a second actuated ball valve (6, 6, 6”, 6”) is arranged in front of the suction port (10), wherein the method comprises the step of controlling the activity of the ball valves (4, 4', 4”, 4’, 6, 6', 6”, 6”) on the basis of one or more predefined criteria.
8. Method according to claim 7, wherein the system (20) comprises: - a liquid-gas separator (14) having an inlet port (60), a gas outlet port (62) and a liquid outlet port (64); - a gas cooler (24) having an inlet port (66) and an outlet port (68); - a high pressure valve (26) arranged between the outlet port (68) of the gas cooler (24) and the inlet port (60) of the liquid-gas separa- tor (14); - a temperature sensor arranged to detect the temperature of the fluid leaving the gas cooler (24); - a pressure sensor arranged to detect the pressure of the fluid leav- ing the gas cooler (24); - a pressure sensor arranged to detect the pressure of the fluid leav- ing the gas cooler (24);
DK 2022 00912 A1 22
9. Method according to claim 8, wherein the method comprises the fol- lowing steps: - detecting the opening degree of the high-pressure valve (26); - opening one or more of the actuated ball valves (4, 4’, 4”, 4””) ar- ranged in front of the motive ports (8) of the ejectors (2, 2’, 2”, 2") if: a) the control unit (12) is in operation state and b) the opening degree of the high pressure valve (26) is equal to or higher than a predefined level.
10. Method according to claim 9, wherein one or more of the actuated ball valves (4, 4, 4”, 4””) arranged in front of the motive ports (8) of the ejectors (2, 2', 2”, 27”) are closed if: - the opening degree of the high pressure valve (26) is equal to or less than a predefined level; - the pressure at outlet port (68) of gas-cooler (24) is equal to or less than a predefined setpoint pressure at the outlet port (68) of the gas-cooler (24) and - the suction ports (10) for the respective ejectors (2, 2', 2”, 2”) are closed.
11. Method according to claim 10, wherein the method comprises the step of detecting the opening degree of the gas-by-pass valve (28), wherein the actuated ball valves (6, 6, 6”, 6'”) arranged in front of the suction ports (10) of one or more of the ejectors (2, 2’, 2”, 2'”) are be- ing opened if: - the motive ports (10) of the one or more of the ejectors (2, 2’, 2”, 2'”) are open; - the temperature of the fluid at the outlet port (68) of the gas cool- er (24) is within a predefined temperature range; - the suction pressure at the intermediate temperature compressor (16) is within a predefined range;
DK 2022 00912 A1 23 - the opening degree of the gas-by-pass valve (28) is below a prede- fined level; - the number of actively operated ejectors (2, 2’, 2”, 2”) corre- sponds to a predefined number based on the number of actively operated medium temperature compressors (18) and - the capacity of the intermediate temperature compressors (16) is below 100 %.
12. Method according to claim 11, wherein the method comprises the step of closing the actuated ball valves (6, 6', 6”, 6”) arranged in front of the suction ports (10) of one or more of the ejectors (2, 2', 2”, 2") if either of following constraints are met: - the temperature of the fluid leaving the gas cooler (24) is no longer within a predefined temperature range limit; - the opening degree of the gas-by-pass valve (28) exceeds a prede- fined level; - the number of actively operated ejectors (2, 2’, 2”, 27) exceeds a predefined number, wherein the predefined number is based on the number of actively operated medium temperature compressors (18).
DKPA202200912A 2022-10-07 2022-10-07 CO2 heat pump system or CO2 cooling system comprising an ejector unit and method for controlling the ejector unit of a CO2 heat pump system or a CO2 cooling system DK181547B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DKPA202200912A DK181547B1 (en) 2022-10-07 2022-10-07 CO2 heat pump system or CO2 cooling system comprising an ejector unit and method for controlling the ejector unit of a CO2 heat pump system or a CO2 cooling system
EP23200752.6A EP4350248A1 (en) 2022-10-07 2023-09-29 Refrigeration system comprising an ejector assembly and method for controlling such a refrigeration system
CA3215349A CA3215349A1 (en) 2022-10-07 2023-10-04 Co2 heat pump system or co2 refrigeration system comprising an ejector assembly and method for controlling an ejector assembly of a co2 heat pump system or a co2 refrigeration system
US18/376,936 US20240118003A1 (en) 2022-10-07 2023-10-05 CO2 Heat Pump System or CO2 Refrigeration System Comprising an Ejector Assembly and Method for Controlling an Ejector Assembly of a CO2 Heat Pump System or a CO2 Refrigeration System

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DKPA202200912A DK181547B1 (en) 2022-10-07 2022-10-07 CO2 heat pump system or CO2 cooling system comprising an ejector unit and method for controlling the ejector unit of a CO2 heat pump system or a CO2 cooling system

Publications (2)

Publication Number Publication Date
DK202200912A1 true DK202200912A1 (en) 2024-04-26
DK181547B1 DK181547B1 (en) 2024-04-26

Family

ID=88241347

Family Applications (1)

Application Number Title Priority Date Filing Date
DKPA202200912A DK181547B1 (en) 2022-10-07 2022-10-07 CO2 heat pump system or CO2 cooling system comprising an ejector unit and method for controlling the ejector unit of a CO2 heat pump system or a CO2 cooling system

Country Status (4)

Country Link
US (1) US20240118003A1 (en)
EP (1) EP4350248A1 (en)
CA (1) CA3215349A1 (en)
DK (1) DK181547B1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6547781B2 (en) 2016-06-16 2019-07-24 株式会社デンソー Refrigeration cycle device
CN110337572B (en) * 2017-02-28 2021-05-04 丹佛斯有限公司 Method for controlling ejector capacity in vapor compression system
JP2021162205A (en) * 2020-03-31 2021-10-11 ダイキン工業株式会社 Air conditioning device

Also Published As

Publication number Publication date
US20240118003A1 (en) 2024-04-11
CA3215349A1 (en) 2024-04-07
EP4350248A1 (en) 2024-04-10
DK181547B1 (en) 2024-04-26

Similar Documents

Publication Publication Date Title
US11561028B2 (en) Heat pump with ejector
EP3069089B1 (en) Centrifugal refrigerant compressor system
US10401058B2 (en) Heat pump with ejector
US10823461B2 (en) Ejector refrigeration circuit
CN101589273B (en) Air conditioner
US10724771B2 (en) Ejector refrigeration circuit
DK2691706T3 (en) Ejector mixer.
EP3108188B1 (en) Vapour compression system
DK202200912A1 (en) CO2 Heat Pump System or CO2 Refrigeration System Comprising an Ejector Assembly and Method for Controlling an Ejector As- sembly of a CO2 Heat Pump System or a CO2 Refrigeration System
US20210071668A1 (en) Variable economizer injection position
US20180156497A1 (en) Self-regulating valve for a vapour compression system
EP3997343B1 (en) Surge protection for a multistage compressor
US10444773B1 (en) Pressure regulating valve with multi-pronged piston assembly
CN111256381B (en) Compressor anti-surge air supply system, control method and air conditioning equipment
US20230228468A1 (en) Heat pump system and the control method thereof
Blatchley Controlling Ejector Performance
US20230160610A1 (en) Heat Pump with Ejector
CN111271892B (en) Refrigeration system
CN110118427B (en) Hot gas bypass energy recovery

Legal Events

Date Code Title Description
PAT Application published

Effective date: 20240408

PME Patent granted

Effective date: 20240426