2761results about "Compression machines with non-reversible cycle" patented technology

The invention discloses a defrosting control method and device, refrigeration equipment and a storage medium, and belongs to the technical field of defrosting. According to the defrosting control method, in the first stage, the heater is controlled to defrost the evaporator; entering a second stage when the defrosting state of the first stage meets a first condition; and in the second stage, a compressor exhaust pipe of the refrigerating system is controlled to communicate with the evaporator to conduct hot gas defrosting, and when hot gas defrosting is conducted under the first condition, the heat exchange medium flowing out of the evaporator is in a gaseous state. According to the defrosting control method disclosed by the invention, the heater is firstly controlled to defrost, and then the compressor is controlled to defrost by hot gas, so that staged defrosting is realized; the defrosting state of the first stage is controlled, so that the surface temperature of the evaporator is not too low when hot gas defrosting is carried out, heat exchange media flowing out of the evaporator are prevented from being liquefied, and liquid impact is prevented; and meanwhile, the heater is turned off in the second stage, and excessive heat generated by the heater can be prevented from overflowing to the compartment.

To improve the durability of gas bearings. [Solution] The compressor 12 starts when the expansion valve 14 is at the second opening, so the compression ratio of the compressor 12 is small when the compressor 12 starts. Therefore, the pressing load applied from the rotor to the gas bearing is small. The expansion valve 14 is switched to the first opening after the compressor 12 starts. Therefore, the compression ratio of the compressor 12 after starting returns to the compression ratio before the expansion valve 14 was switched to the second opening, preventing any impact on the compression efficiency of the compressor 12 after starting. The compressor 12 then stops after the expansion valve 14 is switched from the first opening to the second opening. Therefore, even if the rotational speed of the rotor falls below the levitation rotational speed as the compressor 12 tries to stop and the gas bearing supports the rotor in contact with the rotor, the pressing load applied from the rotor to the gas bearing is small.

The application discloses a heat management integrated module, a shunt component and a first heat exchanger connection, the first interface of the shunt component can be in communication with the second interface and the third interface at the same time; the throttling channel of the first heat exchanger has a throttling function, the first flow channel and the second flow channel are isolated from each other in the first heat exchanger, and the throttling channel and the first flow channel can be in communication; the second interface is in communication with the throttling channel, and the third interface can be in communication with the second flow channel. In the application, the shunt component has a shunt function, the first heat exchanger has a throttling channel capable of realizing a throttling function, when the heat management integrated module is in an operating state, two fluid streams shunted through the shunt component realize heat exchange in the first heat exchanger, the first heat exchanger integrates the throttling function and the heat exchange function, part of the pipeline can be shortened or cancelled, and thus the occupied space of the heat management integrated module can be reduced. The application also provides a heat management system capable of reducing the occupied space.

The refrigeration house condenser waste heat recovery energy-saving system comprises a refrigeration module, the refrigeration module is connected with a first heat energy recovery module, and the first heat energy recovery module is connected with a user side; the refrigeration module comprises a compressor, a first condenser, a first expansion valve and a first evaporator, the compressor is communicated with the first condenser, the first condenser is communicated with the first expansion valve, the first expansion valve is communicated with the first evaporator, and the first evaporator is communicated with the compressor; the first heat energy recovery module comprises a first water pump and a first adjusting valve connected with the first water pump in parallel, and the first adjusting valve and the first water pump are connected with a water supply source and communicate with the first condenser. The first condenser is connected with a second regulating valve, the second regulating valve is respectively communicated with one end port of a third regulating valve and one end port of a fourth regulating valve, the third regulating valve is communicated with the first condenser, and the fourth regulating valve is connected with a user side. The system improves the utilization rate of primary energy in the operation process of the refrigeration house.

Heat pump systems that include vapor injection feature are disclosed. Embodiments may include a heat pump system that has two tandem scroll compressors. Each compressor is paired with a control valve that regulates the flow of vapor to the respective compressor. Both the control valves are in fluid communication with a single or common source for vapor injection and to the controller. During operation, the controller dynamically determines how much vapor injection is needed for each of the compressors based on the operational data of the compressors and, optionally, ambient environment data. The controller then operates the two valves to ensure that the right amount of vapor is injected into each compressor.

A cooling system includes a liquid loop, a vapor compression loop, and a heat exchanger in fluid communication with each of the liquid loop and the vapor compression cycle loop. The liquid loop includes a cold sink for cooling a heat load. The vapor compression cycle loop is fluidly coupled to the liquid loop by a separator, which is configured to separate a two-phase form of a working fluid received from the cold sink into a vapor form of the working fluid and a liquid form of the working fluid.

The invention provides a performance prediction method and device based on a refrigerating machine, electronic equipment and a storage medium, and relates to the technical field of refrigeration, and the method comprises the steps that the condensation saturation temperature, the evaporation saturation temperature and the compression exhaust temperature of a refrigerating system are collected in the running test operation process, so that the saturated liquid phase enthalpy and the saturated gas phase enthalpy are determined; according to the condensation saturation pressure calculated according to the condensation saturation temperature and the compression exhaust temperature, the overheat gas specific enthalpy is determined, system refrigeration energy efficiency prediction is conducted according to the saturated liquid specific enthalpy, the saturated gas specific enthalpy and the overheat gas specific enthalpy, and the target system refrigeration energy efficiency is obtained; and performing unit performance prediction on the target refrigerator by using the target refrigeration performance model, the target system refrigeration energy efficiency, the frequency converter efficiency, the motor efficiency and the bearing transmission efficiency. According to the method, the actual refrigerating performance calculation of the refrigerating machine unit from the refrigerating cycle theory can be realized, the problem of performance prediction deviation of the refrigerating machine is effectively solved, and the performance prediction effect of the refrigerating machine is improved.

To make it possible to adjust temperature by changing the temperature of a heat medium in accordance with the thermal load situation of a temperature adjustment object without complicating the structure of a heat medium circuit.SOLUTION: A temperature adjustment device includes a compressor, a first heat exchange part functioning as a radiator, a decompression device, and a second heat exchange part functioning as a heat sink. The temperature adjustment device has a refrigerant circuit which circulates coolant discharged by the compressor in the first heat exchange part, the decompression device, and the second heat exchange part in this order, a heat medium circuit on a high temperature side where a heat medium heat exchanging with coolant in the first heat exchange part circulates, and a heat medium circuit on a low temperature side where the heat medium exchanging heat with the coolant in the second heat medium circuit circulates, and adjusts the temperature of a plurality of temperature adjustment objects via the heat medium. The first heat exchange part and the second heat exchange part are provided with a plurality of heat exchange elements. The heat medium circuit has a switch part which is capable of switching a serial mode in which the heat medium continuously passes the heat exchange element selected from a plurality of heat exchange elements and exchanges heat with the temperature adjustment objects, and a parallel mode in which the heat medium individually passes the heat exchange elements and exchanges heat with the temperature adjustment objects.SELECTED DRAWING: Figure 1

The application discloses a refrigeration system control method and device based on dryness physical benchmark. The method comprises the following steps: establishing a benchmark quantity of refrigerant, wherein the benchmark quantity Φ is only related to the physical property of the refrigerant and is irrelevant to system specific parameters such as pipeline length, charging quantity and heat exchanger area; acquiring the dryness of the condenser outlet in real time x ; taking the dryness x tending to 0 as a control target, and adjusting the total flow of the system so that the system approaches its inherent energy efficiency characteristic curve. The application also provides a float type device and an injection type device for realizing the method. The application promotes the dryness from a traditional measured quantity to an active physical benchmark, so that the refrigeration system automatically approaches the theoretical optimal state under various actual working conditions, and the energy efficiency is significantly improved, with an average COP improvement of 11.6% and a worst case improvement of 16.2%.

An oil-free compressor includes a compressor housing with a suction inlet and a discharge outlet, a compression mechanism and a liquid-vapor separation volume disposed within the compressor housing, a crankshaft. The compression mechanism has an inlet fluidly connected to the suction inlet and a discharge volume fluidly connected to the discharge outlet. The crankshaft is engaged with the compression mechanism. The liquid-vapor separation volume is configured to separate a mixed phase of working fluid into liquid working fluid and gaseous working fluid. The liquid working fluid is supplied to the bearing. A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a refrigerant circuit with an oil-free compressor, a condenser, one or more expanders, and an evaporator.

A bearing system for a compressor including an unloader at least partially received within a recess of a driveshaft. The unloader includes an outer surface that is engaged with a bearing. An inner surface of the unloader is curved such that the unloader is pivotable relative to the driveshaft unload forces on bearing caused by deflection of the driveshaft.

Provided is a highly reliable refrigeration cycle device. A refrigeration cycle device (100) comprises a refrigerant circuit (Q1) in which a compressor (1), a heat source-side heat exchanger (3), a receiver (5), an expansion valve (7), and a load-side heat exchanger (8) are sequentially connected in a loop. A refrigerant that is sealed in the refrigerant circuit (Q1) is a non-azeotropic refrigerant mixture including a first refrigerant, in which a disproportionation reaction can occur, and a second refrigerant, which has a lower saturation pressure than the first refrigerant. The refrigeration cycle device further comprises a pipe (K3) and an on / off valve (11) that allow a liquid refrigerant to flow out from the receiver (5) when the liquid level of the liquid refrigerant is at least a prescribed liquid level with reference to the bottom of the receiver (5).

A heat pump cycle device is provided with a compressor (11), a branch section (12a), a heating section (15), low-temperature-side pressure reducing sections (19, 26, 27), a bypass passage (13), a bypass-side pressure reducing section (14), converging sections (12b, 25), a heat absorbing section (20), and a control section (70). The control unit performs control for switching between the first heating mode and the second heating mode. In the first heating mode, all of the refrigerant discharged from the compressor flows into the heating unit via the branch unit, and the heat absorbed from the heat-absorbing object by the heat-absorbing unit is absorbed to heat the heat-absorbing object. In the second heating mode, a portion of the refrigerant discharged from the compressor flows into the bypass passage via the branch portion, and the refrigerant discharged from the bypass-side pressure reduction portion is guided to the converging portion. When switching from the first heating mode to the second heating mode, the control unit executes a restriction operation for restricting the amount of heat dissipated in the heating unit in the first heating mode to a low level, and after the restriction operation is executed, the switching to the second heating mode is completed.

A refrigerant compressor group for a refrigeration system that includes least two piston compressors operating in parallel between a common low-pressure connector and a common high-pressure connector. To adjust it to different requirements, in a refrigerant compressor group, a variable overall mass flow throughput in the refrigerant compressor group is adjustable. For at least one of the piston compressors, its mass flow throughput is adjustable by speed selection using a frequency converter for the electric motor. For at least one of the piston compressors, its mass flow throughput is adjustable by cylinder selection. An operating condition controller for the refrigerant compressor group is provided which, on the basis of a performance request signal of the refrigeration system that is transmitted to the operating condition controller, controls the overall mass flow throughput by open or closed-loop control by predetermining the cylinder selection and the speed selection.

The invention relates to a system for thermal recovery from gaseous effluents operating in an open cycle, using said gaseous effluents as a working fluid and comprising a compression section, comprising at least one compressor (11) preferably driven by an electric motor (10), said compressor sucking gaseous effluents from a stream of hot residual gases and compressing the same effluents with consequent rise in temperature of said compressed gaseous effluents, a heat transfer section, comprising a secondary heat recovery circuit and a heat exchanger (13) for the thermal transfer to a carrier fluid (7), circulating in said secondary circuit, of thermal energy taken from said compressed gaseous effluents and for the consequent cooling of the same, an expansion section, comprising at least one expander (14) for a further recovery of energy released by expansion and converted into mechanical or electrical form after cooling by said heat exchanger (13), a discharge section (60) for the discharge of at least part of said gaseous effluents. The invention also has as its object a method of recovering part of the energy contained in the form of heat in gaseous effluents through a plant operating in an open cycle.

The present invention provides a device and a method capable of suppressing a disproportionation reaction. The device is a refrigeration cycle device in which a non-azeotropic refrigerant mixture circulates as a refrigerant in a refrigerant circuit in which a compressor 10, a condenser 11, a first expansion valve 12, and an evaporator 13 have been connected by piping in the given order, said refrigeration cycle device comprising: a low-pressure sensor 16 for detecting the pressure on the intake side of the compressor 10; a branch path 18 that branches from piping connecting the condenser 11 and the first expansion valve 12 and is connected to piping connecting the evaporator 13 and the compressor 10; a second expansion valve 20 provided on the branch path 18; a heat exchanger 19 for performing heat exchange between the refrigerant flowing from the condenser 11 to the first expansion valve 12 and the refrigerant expanded by the second expansion valve 20; and a second solenoid valve 21 that is provided on the branch path 18 downstream of the heat exchanger 19, and opens / closes according to a detection result from the low-pressure sensor 16.

A working medium contains (E)-1,3,3,3-tetrafluoropropene, (Z) 1-chloro-2,3,3,3-tetrafluoropropene, and 1,1,1,2-tetrafluoroethane, wherein, with respect to a total content of the (E)-1,3,3,3-tetrafluoropropene, the (Z) 1-chloro-2,3,3,3-tetrafluoropropene, and the 1,1,1,2-tetrafluoroethane, a content of the 1,1,1,2-tetrafluoroethane is 14.5% by mass or less, a content of the (Z) 1-chloro-2,3,3,3-tetrafluoropropene is 10.0% by mass or less, and a content of the (E)-1,3,3,3-tetrafluoropropene is 75.5% by mass or more.

The refrigerating system comprises a compressor, an evaporative condenser, a gas-liquid separator, a heat regenerator, an evaporator, a heat recoverer, an energy storage device, a terrace heat exchanger, an oil separator, an oil cooler, a water pump, a temperature control valve, an electronic expansion valve, a three-way valve, a control device, a temperature sensor and a pressure sensor. The control device collects signals of compressor outlet and inlet pressure sensors and temperature sensors, evaporator outlet pressure sensors and temperature sensors, an oil return temperature sensor and a floor heat exchanger temperature sensor. Condensing pressure is adjusted by controlling starting and stopping of a condenser side fan and a water pump, and the opening degree of the three-way valve is controlled to enable the oil return temperature to be within a safe range. The evaporation temperature is maintained by adjusting the opening degree of an evaporator inlet electronic expansion valve. By monitoring the terrace temperature in the refrigeration house, the electromagnetic valve is controlled to adjust the refrigerant flow in the terrace heat exchanger to maintain the outlet temperature, and the energy storage device is intermittently put into the refrigeration house to improve the system energy efficiency.

A mixed mode modular cooling system can include two or more mixed mode refrigerant loops and plumbing to permit a working fluid to circulate through at least a portion of the loops. Each mixed mode refrigerant loop can include an evaporator, a condenser, a pump to pump a refrigerant through the evaporator and the condenser, and a compressor configured to compress the refrigerant between the evaporator and the condenser. As cooling demand varies, each mixed mode refrigerant loop can be brought online and operated in either compressed refrigerant mode or pumped refrigerant mode.

The invention provides a water chilling unit which comprises a compressor and a condenser, an outlet of the compressor communicates with an inlet of the condenser through a compressor outlet pipeline, and a check valve with a magnet is further arranged in a discharging pipeline. When the water chilling unit normally operates, the check valve is kept at the maximum opening degree through the magnets with attracted heteropoles, and when the water chilling unit stops operating, closing of the check valve is buffered through the magnets with repulsive homopoles.

A refrigeration system includes one or more compressors (14,24), a gas cooler (105), a flash tank (106), one or more evaporators (12,22), a heat reclaim system (110), valves (120,122,124,126), and a control system (105). The heat reclaim system receives a working fluid from the one or more compressors and the gas cooler. The heat reclaim system is fluidly coupled, through a first supply line (111), to the one or mor compressors, and fluidly coupled, through a second supply line (113), to the gas cooler. The valves regulate a flow of the working fluid from the one or more compressors and the gas cooler to the heat reclaim system. The control system receiving at least one feedback signal from the heat reclaim system and, in response to the at least one feedback signal, operates the valves to regulate an amount of the working fluid circulated into the heat reclaim system from the one or more compressors and the gas cooler.

The invention relates to the technical field of heat recovery of heat pumps, in particular to a heat pump-waste heat dual-recovery steam heating system based on screw compression. Comprising a base; the annular storage module is arranged on the base in a vertical state, and the annular storage module is provided with an outer storage unit and an inner storage unit which can be used for storing steam, and a leading-out pipe which can be used for leading out condensate water in the outer storage unit and the inner storage unit; the flow guide module is rotationally arranged at the bottom of the base, and the flow guide module is used for guiding out condensate water in the outer storage unit and the inner storage unit; the heat preservation module is vertically arranged on the base; according to the invention, steam can be comprehensively insulated and protected, and condensate water can be actively repelled.

The invention discloses a coal mine goaf low-temperature nitrogen fire preventing and extinguishing technology integrating intelligent monitoring and control, and belongs to the technical field of coal mine goaf fire preventing and extinguishing. The system comprises a ground nitrogen making machine, a ground monitoring center, an underground nitrogen cooling device, an intelligent monitoring module and a PLC intelligent control module. The nitrogen cooling device comprises a plate heat exchanger, a variable-frequency single-screw compressor, an air-cooled condenser, a liquid storage tank and an electromagnetic control valve which are connected in sequence; the intelligent monitoring module comprises a sensor unit and a communication transmission module; the PLC intelligent control module comprises a core controller, a man-machine interaction unit and a remote transmission unit; and the PLC intelligent control module automatically controls the start and stop of the system according to a preset three-level fire prevention and extinguishing threshold value, and dynamically adjusts the cooling temperature and the refrigerating capacity. According to the invention, 'monitoring-regulation-feedback 'closed-loop intelligent control is realized, an efficient and safe fire prevention and extinguishing technical support is provided for a special mining period of a mine easy to spontaneously ignite, and the system adapts to an underground complex environment.

The system comprises a power generation system and a heat supply system, the power generation system comprises a boiler, a carbon dioxide turbine, a heat regenerator, a precooler, a compressor and a motor generator, an outlet of the boiler is connected with an inlet of the turbine, an outlet of the turbine is connected with a hot side inlet of the heat regenerator, and an outlet of the compressor is connected with a hot side inlet of the precooler. An outlet of the precooler is connected with an inlet of the compressor, an outlet of the compressor is connected with a cold-side inlet of the heat regenerator, a cold-side outlet of the heat regenerator is connected with an inlet of the boiler, and the compressor and the turbine are respectively connected with the motor generator. The heat supply requirement can be met, complete thermoelectric decoupling is achieved, and the flexibility of the supercritical carbon dioxide cycle generator set is fully exerted while stable heat supply is achieved.

The invention provides hydrogen production and storage energy equipment and system, and belongs to the technical field of hydrogen energy storage, the hydrogen production and storage energy equipment comprises a cabinet body, the upper end face of the cabinet body is provided with a taking and placing opening used for taking and placing a hydrogen storage device; the hydrogen storage device is mounted at the upper part of the cabinet body; the fuel cell power generation device is pre-mounted below the hydrogen storage device; the water storage tank, the hydrogen production device, the gas-water separation device and the energy management device are fixedly arranged at the bottom of the cabinet body. The hydrogen production and storage energy equipment provided by the invention simultaneously has three functions of hydrogen production, hydrogen utilization and power generation, can conveniently convert solar energy and water into green hydrogen energy and electric energy, and has the advantages of safety in use, miniaturization in structure, convenience in use and maintenance, moderate cost and the like.

The refrigerant circuit for hydrocarbon refrigerants is isolated from heat-generating elements within the vehicle body. [Solution] The on-board air conditioning system comprises a refrigerant circuit R and first and second coolant circuits C1 and C2. The refrigerant circuit R has a compressor 20, a condenser for heat dissipation, an expansion valve 24a, and an evaporator for heat absorption, through which a hydrocarbon refrigerant circulates. A first heat exchanger 30 is integrally configured with the condenser of the refrigerant circuit R and transfers heat from the refrigerant in the condenser to the coolant of the first coolant circuit C1. The first coolant circuit C1 has a radiator. A second heat exchanger 40 is integrally configured with the evaporator of the refrigerant circuit R and cools the coolant of the second coolant circuit C2 with the refrigerant in the evaporator. The second coolant circuit C2 has a cooler core located in the air conditioning unit. The on-board air conditioning system comprises a heat shield plate 100 positioned between the refrigerant circuit R and the first and second heat exchangers 30 and 40 and a heat-generating element 14 mounted on the vehicle.

A heat pump device (1) comprises a refrigerant circuit (11), an electric heater (EH), a switching valve (Vt), and a control unit (15). The electric heater (EH) is disposed inside a hot water storage tank (HWT) that accommodates a heat exchange coil (HC) provided in a branch pipeline (17) that branches from a utilization pipeline (13) that allows a utilization fluid (Fu) to pass through a first heat exchanger (112) of the refrigerant circuit (11). The switching valve (Vt) is provided in the utilization pipeline (13), and switches between a first state in which an upstream side and a downstream side of the utilization pipeline (13) communicate with each other, and a second state in which the upstream side of the utilization pipeline (13) and the branch pipeline (17) communicate with each other. The control unit (15) executes a first mode in which a switching mechanism (116) of the refrigerant circuit (11) is controlled to perform a cooling operation, and at the same time, the switching valve (Vt) is controlled to be a first state such that the electric heater (EH) is energized to heat water stored in the hot water storage tank (HWT).

To suppress disproportionation in a refrigerant including HFO-1132(E).SOLUTION: The present invention discloses a method for suppressing the disproportionation reaction of trans-1,2-difluoroethylene (HFO-1132(E)), the method including a step for operating a refrigeration cycle by using a composition that includes a refrigerant, the refrigerant including HFO-1132(E) as well as trifluoroethylene (HFO-1123) and difluoromethane (R32).SELECTED DRAWING: None

The application discloses a mobile air conditioner with ice making function, which comprises a cold air fan body, at least one air inlet and one air outlet are arranged on the cold air fan body, a water tank placing cavity is arranged on the cold air fan body close to the bottom, a water tank is arranged in the water tank placing cavity, and a water pump is connected to the water tank outside or inside; an ice maker assembly is connected with the water pump through a water pipe, the structure of the application is reasonable, the ice maker assembly and the ice block dispersing device are designed, the cold air fan can have the ice making function at the same time, the water in the water tank of the cold air fan is used to achieve the ice making function, the ice blocks are dispersed and conveyed through the ice block dispersing device, and the ice blocks are evenly arranged at the air outlet position of the cold air fan, so that the cold air function and further refrigeration effect can be realized at the same time, resource waste is avoided, the labor cost is reduced, and the practicability of the cold air fan is improved as a whole.

The invention relates to a method for operating an electric motor operatively connected to a compressor in a substantially noiseless and vibrationless manner, the method comprising the steps of providing a desired speed range of the electric motor, operating the electric motor at a plurality of selected speeds within the desired speed range, determining a set of electric motor correlation values for each selected speed, processing the determined set of electric motor correlation values for each selected electric motor speed, and operating the electric motor at the speed or within the speed range in dependence of the processing of the determined set of electric motor correlation values. The invention further relates to a drive system configured for operating an electric motor operatively connected to a compressor in a substantially noiseless and vibrationless manner. The invention further relates to a method for monitoring an electric motor operatively connected to a compressor, the method comprising the steps of comparing a predefined set of electric motor correlation values with a determined set of electric motor correlation values, and controlling the electric motor in accordance with a predetermined schedule in case a deviation between the determined set of electric motor correlation values and the predefined set of electric motor correlation values exceeds an amount.