368results about "Compression machines with cascade operation" patented technology

An assembly includes a fluid conditioning system including a cascade module and an active charge compensator integrated into the fluid conditioning system. The fluid conditioning system is transformable between a first mode and a second mode. In the first mode, the fluid conditioning system includes a first vapor compression loop and a second vapor compression loop. The first vapor compression loop and the second vapor compression loop are thermally coupled at the cascade module and the second vapor compression loop is fluidly separate from the first vapor compression loop. In the second mode, the fluid conditioning system includes a single vapor compression loop. The active charge compensator is operable to control a working fluid charge within the fluid conditioning system based on the mode of operation selected from the plurality of modes.

A primary refrigerant circuit allows circulation of a primary refrigerant and includes a primary compressor, a cascade heat exchanger, and a primary heat exchanger. A secondary refrigerant circuit allows circulation of a secondary refrigerant and includes a secondary compressor, the cascade heat exchanger, and a utilization heat exchanger. The primary refrigerant circuit includes a first connecting pipe, a primary first connection pipe, and a liquid connecting pipe connecting the cascade heat exchanger and the primary heat exchanger, a primary suction flow path of the primary compressor, a primary subcooling circuit connecting the liquid connecting pipe and the primary suction flow path, and a primary subcooling expansion valve provided in the primary subcooling circuit.

This invention provides a carbon dioxide recovery cascade refrigeration system, including a circulation loop and a first heat exchanger, a compressor, a condenser, and a first oil drain pipe disposed on the circulation loop. The circulation loop is used for the flow of carbon dioxide heat exchange medium. The first heat exchanger has independent first and second heat exchange channels. The first heat exchange channel has a first inlet and a first outlet. The second heat exchange channel has a second inlet and a second outlet respectively connected to the circulation loop. The carbon dioxide heat exchange medium in the second heat exchange channel is used to reduce the temperature of the medium in the first heat exchange channel. An oil drain port is provided at the bottom of the first heat exchange channel. The gas inlet of the compressor is connected to the second outlet of the first heat exchanger. The condenser is located downstream of the compressor and is used to condense the carbon dioxide heat exchange medium after compression by the compressor. The oil drain port is connected to the inlet of the compressor through the first oil drain pipe. This system uses carbon dioxide as the heat exchange medium, resulting in low cost.

The control method comprises the steps that the rotating speed of a high-temperature-stage inverter compressor is mainly comprehensively determined by the high-temperature-stage exhaust temperature, the high-temperature-stage condenser temperature, the high-temperature-side outlet temperature of an intermediate heat exchanger and the high-temperature-stage return air temperature; through dynamic adjustment of the first fuzzy PID controller, the working condition and energy efficiency of the high-pressure side of the system are optimized; the rotating speed of the low-temperature-stage frequency conversion compressor is mainly comprehensively determined by the temperature in the box, the real-time rotating speed of the high-temperature-stage compressor, the low-temperature-stage exhaust temperature, the temperature of the intermediate heat exchanger and the low-temperature-stage return air temperature, and the rotating speed is dynamically adjusted through the second fuzzy PID controller so as to ensure that the temperature in the box is accurate and stable and is matched with the high-temperature-stage capacity in real time. Through cooperative control of the parameter groups, the problems of low efficiency and unstable operation caused by mismatching of two-stage capabilities of the cascade system are solved, and efficient, stable and reliable operation of the system under all working conditions is realized.

The invention provides a refrigerating system and an air conditioner, the refrigerating system comprises a first compressor, a first heat exchanger, a first valve, a second heat exchanger and an ejector, the first compressor, the first heat exchanger, the first valve and the second heat exchanger are connected to form at least partial structure of a first refrigerating loop; the ejector comprises a first inlet end, a second inlet end and a first outlet end, the first inlet end is communicated to the outlet end of the second heat exchanger, the second inlet end is communicated to the exhaust end of the first compressor, and the first outlet end of the ejector is communicated to the inlet end of the second heat exchanger. According to the invention, the evaporation or condensation heat exchange efficiency can be improved, so that a refrigerant which does not fully exchange heat can continuously participate in heat exchange circulation, and the compressor is prevented from sucking air and carrying liquid; the problem that in a heat exchanger of a refrigerating system in the prior art, heat exchange of refrigerants is not sufficient, and consequently the refrigerants are not completely evaporated or condensed is effectively solved.

The installation (21) comprises: a primary refrigerant circuit (22), including: - an outdoor unit (23) comprising at least: a first compressor (34), a first heat exchanger (25) configured to exchange heat between a first refrigerant and the outside air, and at least one first expansion valve (26), - an indoor unit (29) comprising at least one second heat exchanger (30) configured to exchange heat between the first refrigerant and the inside air, a secondary refrigerant circuit (32) independent of the primary circuit (22), intended to be installed inside the dwelling and comprising: - a water heater comprising a tank (33), a condenser (35), a second compressor (34) and at least one second expansion valve (36),the primary circuit (22) comprising at least one third heat exchanger (37) allowing the primary circuit (22) and the secondary circuit (32) to be thermally coupled directly or indirectly. Figure from the abstract: Figure 2,

Systems and methods for regenerative ejector-based cooling cycles that utilize an ejector as the motivating force in a cooling loop to regeneratively sub-cool a refrigerant in a single-stage cooling cycle.

In a cooling system for cooling the interior of a vehicle by circulating a CO2-containing refrigerant, the refrigerant reliably and efficiently cools a battery. A cooling system (100) is provided with: a compressor (1) that compresses a refrigerant; a heat exchanger (2) for cooling the refrigerant from the compressor (1); heat exchangers (5a, 6a) that use the refrigerant cooled by the heat exchanger (2); a refrigerant passage (17) for supplying the refrigerant from the heat exchangers (5a, 6a) to the battery (6); a refrigerant passage (14) for supplying the refrigerant cooled by the heat exchanger (2) to the refrigerant passage (17) without passing through the heat exchangers (5a, 6a); an expansion valve (E2) provided in the refrigerant passage (17); the flow regulating valve (V3) is arranged on the refrigerant channel (14); wherein the control device (80) increases the opening degree of the flow regulating valve (V3) when the specific enthalpy of the refrigerant supplied to the battery (6) exceeds a prescribed range, and decreases the opening degree of the flow regulating valve (V3) when the specific enthalpy is below the prescribed range.

The invention provides a cascade heat pump and an adjusting method, and relates to the technical field of heat pumps. The cascade heat pump comprises a first-stage heat pump circulation system, a second-stage heat pump circulation system and a tail end pipeline, the first-stage heat pump circulation system comprises a first compressor, a hot side channel of a gas cooler, a hot side channel of a cascade heat exchanger, a first expansion valve and an evaporator which are sequentially connected to form a first refrigerant circulation; the second-stage heat pump circulation system comprises a second compressor, a condenser, a second expansion valve and a cold side channel of the cascade heat exchanger which are sequentially connected to form a second refrigerant circulation; the tail end pipeline is sequentially communicated with a cold side channel of the gas cooler and a cold side channel of the condenser in the conveying direction. According to the cascade type heat pump, due to the flow direction arrangement of the gas cooler and the tail end pipeline, the effective energy of the hot side channel and the cold side channel in the condenser in the heat exchange process can be effectively improved, the heating load of the condenser is effectively reduced, and therefore the overall performance coefficient of the cascade type heat pump is improved.

Methods for forming an improved, centralized refrigeration systems by: (a) providing an existing refrigeration circuit with an existing high GWP refrigerant; (b) disconnecting the fluid connection between the existing refrigerant liquid from the condenser and the evaporators; (c) disconnecting the fluid connection between the existing refrigerant vapor from the evaporators and the compressor suction; (d) establishing a new first refrigeration circuit comprising the compressor and the condenser; (e) establishing a new second refrigeration circuit comprising the evaporators by removing existing refrigerant from the evaporators and the disconnected conduits and replacing the removed refrigerant with a second refrigerant comprising at least 50% of R1234ze(E) and being Class Al and having an OEL greater than 400 and a GWP of about 150 or less; and thermally interconnecting the new first refrigeration circuit and the new second refrigeration circuit with an inter-circuit heat exchanger.

A refrigerant circuit includes a first compressor connected to a first suction pipe and a first discharge pipe and configured to compress a refrigerant, a second compressor connected to a second suction pipe and a second discharge pipe and configured to compress the refrigerant discharged from the first compressor, a radiator, and a high-pressure passage connecting the second discharge pipe and the radiator. A first oil drain passage guides an oil in the second compressor to one of the first suction pipe and an intermediate port of the first compressor, without via the high-pressure passage.

The invention relates to a thermoelectric heat pump including a heat exchanger block with a first channel for flow therethrough of a first heat transfer fluid such as a liquid medium and a separate second channel for flow therethrough of a second heat transfer fluid such as a liquid medium. The heat exchanger block includes a heat exchange cavity which is hydraulically separated by a partition into a first and a second sub-cavity which are connected to respectively the first and second channel and wherein the first heat transfer fluid in the first sub-cavity is in heat-exchanging contact with a first side of the partition and the second heat transfer fluid in the second sub-cavity is in heat-exchanging contact with a second side of the partition lying opposite the first side. The partition includes a thermoelectric element with a cold side and a hot side lying opposite thereto and at a distance therefrom. An outer peripheral edge extends between the cold and hot side, which thermoelectric element is configured to transport heat from the cold side to the hot side and wherein the cold side is in heat-exchanging contact with the first heat transfer fluid and wherein the hot side is in heat-exchanging contact with the second heat transfer fluid and wherein each channel is provided with a pump for pumping the respective heat transfer fluid through the channel.

The invention relates to a refrigerant circuit (10) comprising: - a first main loop (A1) comprising successively, according to the direction of refrigerant flow: - a first compressor (7), - a first heat exchanger (1) thermally coupled with a first external airflow (Fe1) to the passenger compartment of a motor vehicle, - a first expansion valve (31), - a second heat exchanger (2), - a second main loop (A2) comprising successively, according to the direction of refrigerant flow: - a second compressor (8), - a third heat exchanger (3) thermally coupled with a second external airflow (Fe2) to the passenger compartment of the vehicle, - a second expansion valve (32), - a fourth heat exchanger (4) thermally coupled with an internal airflow (Fi) to the passenger compartment of the motor vehicle.- a fifth heat exchanger (5) arranged jointly on the first main loop (A1) and on the second main loop (A2). Figure from the abstract: Figure 1,

The ultralow-temperature refrigerating system comprises a low-temperature system, a high-temperature system and a compressor, the low-temperature system comprises a low-temperature evaporator and a low-temperature condenser, the high-temperature system comprises a high-temperature evaporator and a high-temperature condenser, and the low-temperature condenser and the high-temperature evaporator are staggered to form an evaporative condenser. Pipe sets of the low-temperature condenser are arranged in a vertical S shape at equal intervals in the left-right direction, and pipe sets of the high-temperature evaporator are arranged in a horizontal S shape at equal intervals in the up-down direction, so that the cold exchange area of the low-temperature condenser and the high-temperature evaporator is increased, and the cold exchange efficiency of the low-temperature condenser and the high-temperature evaporator is improved; in cooperation with the structural design of a heat dissipation air inlet system, an exhaust hole, a condensation bin and the like, a single driving element is adopted for conducting heat dissipation on a compressor and a high-temperature condenser, then the refrigeration efficiency of a low-temperature system and a high-temperature system is improved, and operation energy consumption is reduced.

A transport climate control system and method for providing a first temperature for cooling a first conditioned space and a second temperature for cooling a second conditioned space. The transport climate control system including a first climate control system including a first compressor, a first condenser, a first expansion device, and a primary heat exchanger that is configured to thermally communicate with a coolant loop, a secondary climate control system including a second compressor, a cascaded heat exchanger, a second expansion device, and an evaporator; and the coolant loop having a coolant. The coolant loop is configured to thermally communicate with the primary heat exchanger, and the coolant loop is further configured to thermally communicate with one or more of the cascaded heat exchanger and the second conditioned space.

The utility model discloses a heat pump system and relates to the technical field of heat pumps. The heat pump system comprises an evaporator, a first compressor, a gas cooler, an intercooler, a second compressor, a condenser and a heating pipeline. The heating pipeline is sequentially connected with the gas cooler and the condenser, the heating pipeline is used for allowing target water to flow, the first compressor is used for compressing a first refrigerant from a low-pressure gas state to an intermediate-pressure gas state, and the gas cooler is used for conducting heat exchange on the first refrigerant in the intermediate-pressure gas state and the target water so as to preliminarily heat the target water; the second compressor is used for compressing the second refrigerant from the middle pressure gas state to the high pressure gas state, and the condenser is used for conducting heat release and condensation on the high pressure gas state second refrigerant into the high pressure liquid state second refrigerant so as to heat the target water again. The heat pump system provided by the utility model can realize the effective utilization of energy, improve the energy efficiency ratio, save energy, protect the environment, improve the heating efficiency, ensure the heating effect, prevent the compressor from being overloaded and improve the safety.

A cooling tower system, comprising: a first cooling cycle system, which comprises a first heat absorption portion, a first wet-cooling heat dissipation portion and a first dry-cooling heat dissipation portion that are in communication; a second cooling cycle system, which comprises a second heat absorption portion, a second wet-cooling heat dissipation portion and a second dry-cooling heat dissipation portion, which are in communication, wherein the first heat absorption portion and the second heat absorption portion are used for performing heat absorption on the same object; and a cooling tower, wherein in the cooling tower, the first wet-cooling heat dissipation portion and the second dry-cooling heat dissipation portion are connected in series in a first air duct, the second wet-cooling heat dissipation portion and the first dry-cooling heat dissipation portion are connected in series in a second air duct, and the first air duct and the second air duct are arranged in parallel. When it is necessary to turn on a wet-cooling heat dissipation portion and a dry-cooling heat dissipation portion of one cooling cycle system, the wet-cooling heat dissipation portion and the dry-cooling heat dissipation portion can be respectively turned on in different air ducts, such that interference between the wet-cooling heat dissipation portion and the dry-cooling heat dissipation portion of the same cooling cycle systems can be effectively reduced, and thus, a better heat exchange effect can be achieved when a single cooling cycle system is turned on.

The invention relates to a shell and tube type condensation and evaporation circulating barrel applied to a cold-carrying or cascade refrigeration system. The problems that in the background technology, when a condensation evaporator and a low-pressure circulation barrel are two independent devices, the devices are too high, the manufacturing cost, the transportation cost, the installation cost and the like of the devices can be increased, the cavitation phenomenon of a refrigeration pump can be caused when the height is reduced, and even faults of the refrigeration pump can be caused when the height is serious are solved. According to the technical scheme for solving the technical problem, the equipment is provided with a liquid inlet, a left tube plate, a barrel, a heat exchange tube, an air inlet, a right tube plate, an air outlet, a left liquid cavity, a liquid outlet and a right air cavity; a liquid storage space is arranged at the bottom of the barrel. The invention is suitable for refrigeration systems.

A ULT freezer is configured with an expansion valve which provides a fast recovery throttling effect during a fast recovery cooling mode and a greater, energy efficient throttling effect during an energy efficient cooling mode.

A transportation climate control system and method for providing a first temperature for cooling a first conditioned space and a second temperature for cooling a second conditioned space. The transportation climate control system includes a first climate control system including a first compressor, a first condenser, a first expansion device, and a primary heat exchanger configured to be in thermal communication with a coolant circuit, a secondary climate control system including a second compressor, a cascade heat exchanger, a second expansion device, and an evaporator; and a coolant circuit having a coolant. The coolant circuit is configured to be in thermal communication with the main heat exchanger, and the coolant circuit is further configured to be in thermal communication with one or more of the cascade heat exchanger and the second conditioned space.

The application relates to a multi-stage cascade refrigeration and heating method, device, storage medium and electronic equipment. The method comprises the following steps: after starting a first-stage compressor of a multi-stage cascade refrigeration and heating device, determining a pressure change rate of the first-stage compressor, wherein the multi-stage cascade refrigeration and heating device at least comprises the first-stage compressor and a second-stage compressor; determining a starting time of the second-stage compressor according to the pressure change rate; and starting the second-stage compressor when the starting time of the second-stage compressor is met. The application solves the technical problem of compressor tripping in a two-stage cascade system.

An ultra low temperature (ULT) freezer (1, fig 1) having a cooling chamber (2) accessible via a door (3) and is cooled by a refrigeration circuit 5. The refrigeration circuit comprises at least a firs

The invention relates to a cascade refrigeration system, a control method thereof and refrigeration equipment, relates to the technical field of refrigeration, and aims to improve the refrigeration response speed when a low-temperature refrigeration loop of the cascade refrigeration system is started. The cascade refrigeration system comprises an intermediate heat exchanger, a high-temperature refrigeration loop, a low-temperature refrigeration loop and a bypass loop. The high-temperature refrigerating loop comprises a first compressor, a first condenser, a first throttler and an intermediate heat exchanger which are sequentially connected, and the intermediate heat exchanger is an evaporation side in the high-temperature refrigerating loop. The low-temperature refrigerating loop comprises a second compressor, an intermediate heat exchanger, a second throttler and an evaporator which are sequentially connected, and the intermediate heat exchanger is a condensation side in the low-temperature refrigerating loop. The bypass loop is arranged in the low-temperature refrigeration loop. And the bypass loop comprises a circulating pump and is configured as follows: before the second compressor is started, the high-temperature refrigerating loop is started, and the bypass loop is conducted for a first preset time so as to drive the refrigerant to circularly flow along the low-temperature refrigerating loop.

The invention relates to a plate-shell type condensation and evaporation circulating barrel applied to a cold-carrying or cascade refrigeration system. The problems that in the background technology, when a condensation evaporator and a low-pressure circulation barrel are two independent devices, the devices are too high, the manufacturing cost, the transportation cost, the installation cost and the like of the devices can be increased, the cavitation phenomenon of a refrigeration pump can be caused when the height is reduced, and even faults of the refrigeration pump can be caused when the height is serious are solved. The key point of the technical scheme adopted for solving the technical problem is that the equipment is provided with a liquid inlet, a left seal head, a cylinder body, a plate core, an air inlet, a right seal head, an air outlet and a liquid outlet; a liquid storage space is arranged at the bottom of the barrel. The invention is suitable for refrigeration systems.

The invention provides a compressor assembly, an air conditioning system, a control method of the air conditioning system and an air conditioner, the compressor assembly comprises a compressor and an oil separator, the compressor is provided with a machine shell, a first compression cylinder and a second compression cylinder, the first compression cylinder is arranged in the machine shell, the upper portion of the machine shell is provided with a first exhaust port, and the bottom of the machine shell is provided with an oil pool; an exhaust port of the first compression cylinder is located in the machine shell. The oil separator is located outside the machine shell, an exhaust port of the second compression cylinder is communicated with a refrigerant inlet of the oil separator, an oil return port of the oil separator is communicated with the oil pool and located above the oil pool, and the oil separator is provided with a gas outlet. The first exhaust port communicates with the gas outlet through a one-way valve. The one-way valve is configured to prevent gas of the gas outlet from flowing towards the first exhaust port. According to the technical scheme, when the exhaust pressure of the first exhaust port is larger than the exhaust pressure of the gas outlet, the efficiency that lubricating oil at the bottom of the oil separator returns to the oil pool can be improved.

The application discloses a cascade refrigeration system flow control method and device, a refrigeration equipment and a medium. The cascade refrigeration system comprises a low-temperature stage compressor, a high-temperature stage compressor, an intermediate heat exchanger, a temperature sensor, a condensing fan and a temperature drop rate sensor. The temperature sensor is arranged on the intermediate heat exchanger. The method comprises the following steps: when the low-temperature stage compressor is started, the real-time temperature monitored by the temperature sensor is synchronously acquired, and the running time length of the low-temperature stage compressor is recorded; the running state of the low-temperature stage compressor is determined according to the real-time temperature and the running time length; and if the low-temperature stage compressor is in a low-flow running state, a low-flow response mode is started. The temperature detected by the temperature sensor and the calculated instantaneous temperature drop rate are utilized to determine the flow condition when the low-temperature stage compressor is started, and the flow control is performed according to the instantaneous temperature drop rate, so that the problem that the refrigerant flow is low and the temperature drop rate is slow due to the liquid accumulation in the intermediate heat exchanger when the low-temperature stage compressor is started is solved.

A cooling system for cooling the battery of an electric vehicle is described including: a primary cooling circuit including a battery and a first heat exchanger, and a pump which circulates a first liquid coolant between the battery and the first heat exchanger; a secondary coolant circuit including an evaporator and a condenser, the evaporator being incorporated into the first heat exchanger, and at least one compressor which circulates a refrigerant fluid between the evaporator and the condenser; and a tertiary cooling circuit including a second heating exchanger and a dry cooler, the condenser being incorporated into the second heat exchanger, and a second pump which circulates a second liquid coolant between the second heat exchanger and the dry cooler.