897results about "Compression machines with cascade operation" patented technology

The utility model relates to an oil way system, a cascade unit, energy-saving equipment and refrigeration equipment, the oil way system comprises a first heat exchanger, a first oil tank and a second oil tank, a first channel and a second channel are arranged in the first heat exchanger, and heat exchange can be conducted between the first channel and the second channel; two ends of the first oil tank are respectively communicated with the first channel to form a first circulating oil path; the two ends of the second oil tank communicate with the second channel to form a second circulating oil way. According to the oil way system, when the oil temperature in the first oil tank and the oil temperature in the second oil tank have a large temperature difference, the oil temperature of one oil tank is too low, and the oil temperature of the other oil tank is too high or too high, heat exchange between the two circulating oil ways can be achieved through the first heat exchanger; and therefore, the conditions of too low oil temperature and too high oil temperature are relieved synchronously, and normal operation of an oil way can be guaranteed. No extra heating assembly or oil cooling assembly is needed, and the power consumption and the manufacturing cost of the oil way system can be obviously reduced.

A system for generating steam for industrial heat. The system may include a plurality of heat pump cycles in thermal communication with each other and in thermal communication with a steam generation cycle. The plurality of heat pump cycles may include first and second heat pump cycles. The first heat pump circulates a first a working fluid and includes a first heat exchanger. The second heat pump cycle circulates a second working fluid and includes a second heat exchanger. The first heat exchanger transfers heat from the first to the second working fluid. The second heat exchanger transfers heat to a third working fluid in the steam generation cycle.

The invention discloses an oil return control method and system of a cascade heat pump system, and the control method comprises the following steps: 1, detecting a first state parameter of an intermediate heat exchanger so as to adjust a compressor and a throttling device at a low-temperature side and a high-temperature side, and when a second state parameter at the low-temperature side meets a condition, adjusting the compressor and the throttling device at the high-temperature side; the operation frequency of the compressor on the low-temperature side / high-temperature side is adjusted again, and return oil flushing is conducted on the intermediate heat exchanger; the second method comprises the following steps: respectively calculating the accumulated carbonization time of the corresponding lubricating oil in the low-temperature side or the high-temperature side, and judging whether the lubricating oil is replaced or not based on the accumulated carbonization time; and the third method comprises the steps that the accumulated low-frequency operation duration of the compressor on the low-temperature side or the high-temperature side in the low-frequency state is detected, and when the triggering condition is met, the operation frequency of the compressor is increased. Based on the control method, the operation reliability and the energy efficiency performance of the cascade heat pump system are improved, and the service life of equipment is prolonged.

To provide a heating apparatus and method for realizing high performance while optimizing energy consumption.SOLUTION: An industrial apparatus comprises: a circuit (2) in which an operating fluid circulates, the circuit (2) comprising means (20) for heating the operating fluid and removing an evaporator; a circulating line (31) in which a heat transfer fluid circulates, the flow rate of the heat transfer fluid in the circulating line (31) being 10-500 m3 / h; a first heat exchanger (901) placing the circuit (2) and the circulating line (31) in thermal communication; and an industrial heater (92) comprising a second heat exchanger (902) where the circulating line (31) passes. The heating means (20) comprises a piston pump (21).SELECTED DRAWING: Figure 1

The utility model relates to a coupling energy supply system based on LNG and a fuel cell, a gas supply unit comprises an LNG storage tank and an LNG vaporizer which are connected through an LNG pipeline, the LNG vaporizer is connected with a downstream gas pipeline through a gas supply pipeline, a power generation unit comprises a cooling heat exchanger and the fuel cell, a cooling loop is arranged between the secondary side of the cooling heat exchanger and the fuel cell, and the fuel cell is connected with the cooling loop. A primary side inlet of the cooling heat exchanger is connected with the LNG storage tank through a BOG pipeline, a primary side outlet of the cooling heat exchanger is connected with a gas inlet of the fuel cell through a fuel pipeline, electric energy generated by the fuel cell is merged into a user electric power internal network, and the system has the advantages of being good in stability and high in safety.

The invention discloses an ultralow-temperature cascade refrigeration device, belongs to the technical field of refrigeration devices, and solves the problems that when a low-temperature screw compressor continuously operates below-80 DEG C, organic acid generated by hydrolysis of trace moisture and ester lubricating oil and metal chips form colloidal deposition, the resistance of a slide valve is increased, displacement lag is caused, and the service life of the slide valve is prolonged. However, the sensor only feeds back an instruction signal and cannot be monitored by a control system, and finally bearing wear or energy efficiency reduction is caused. Comprising a screw compressor and a slide valve state monitoring circuit arranged in the screw compressor. The actual displacement of the slide valve is measured in real time through double-frequency laser interference, the thickness of jelly is analyzed in combination with acoustic surface wave frequency shift, the fault index is calculated after dynamic compensation, early warning is conducted when the limit is exceeded, a blind area of a traditional sensor is eliminated, diagnosis is conducted in advance, and compressor bearing abrasion is avoided.

The invention relates to the technical field of sample storage, particularly provides a cascade refrigeration system and a control method of an ultralow-temperature sample library, and aims to solve the problem that normal operation of a unit is affected due to abnormal oil return of an existing cascade refrigeration system. In order to achieve the purpose, the cascade refrigeration system comprises a high-temperature-stage refrigeration unit, a low-temperature-stage refrigeration unit and an intermediate heat exchanger, the low-temperature-stage refrigeration unit comprises a low-temperature compressor, an oil separation device and a heat exchange device, the oil separation device comprises a plurality of oil separators arranged in sequence, and a heat exchanger is arranged between every two adjacent oil separators; the low-temperature compressor, the oil separation device, the intermediate heat exchanger and the heat exchange device are communicated with one another to form a low-temperature-stage refrigerant circulation loop, and the high-temperature-stage refrigeration unit and the intermediate heat exchanger are communicated with one another to form a high-temperature-stage refrigerant circulation loop. The oil separation efficiency can be improved, deep oil removal is achieved, and oil return is remarkably improved.

A heat pump system is provided. The heat pump system includes a first compressor and a second compressor and a first heat exchanger, a second heat exchanger, and a third heat exchanger. The system further includes a first expansion device, a second expansion device, and a third expansion device. When the system operates in a cascade heating mode, the third heat exchanger is configured to: receive a first portion of refrigerant from the first compressor and a second portion of refrigerant from the second compressor, and provide a first consistent flow of refrigerant to the first compressor and a second consistent flow of refrigerant to the second compressor so as to improve an efficiency of the system.

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.

The invention relates to the technical field of water chilling unit control, in particular to a multi-connected control system for a low-temperature cascade water chilling unit. The system comprises a data acquisition module used for acquiring historical and real-time refrigeration parameter sequences; the refrigeration demand analysis module screens an abnormal period based on the volatility of different period parameter sequences, and calculates a historical refrigeration demand degree in combination with normal period data; the adjustment degree analysis module identifies abnormal units through parameter deviation and gives an alarm, non-abnormal units are sorted according to the parameter deviation degree to generate a demand sequence, and the pressure adjustment degree of the units is dynamically calculated in combination with liquid level distribution; and the adjustment control module performs pressure control on the unit according to the demand sequence and the pressure adjustment degree. According to the method, the historical data and the real-time parameters are fused, the abnormity is responded in time, the unit pressure is dynamically adjusted, the influence of the abnormal unit on the cooperative operation stability of the multiple units under the complex condition is reduced, and the refrigeration effect of the low-temperature refrigeration system meets the high reliability requirement.

A method and apparatus for controlling compressors in a cascade vapor compression system. The process may include controlling the operation of a first compressor based on a constant band control, and controlling the operation of a second compressor based on a proportional band control. Controlling the first compressor based on the constant band control may include operating the compressor at a constant setting if first measurements are within a range associated with a first setpoint. It may also include proportionally adjusting the operation of the first compressor if the first measurements are outside the range. Further, controlling the second compressor based on the proportional band control may include operating the compressor based on one of a plurality of proportional bands, each proportional band having a different proportional factor. Controlling the second compressor operation may further include switching between these proportional bands based on a second measured parameter.

The invention discloses an assembly type pressure-bearing refrigeration system, and particularly relates to the technical field of refrigeration equipment, the assembly type pressure-bearing refrigeration system comprises a container and a combined type refrigeration cycle unit integrated in the container, and the combined type refrigeration cycle unit comprises a low-temperature-stage refrigeration cycle assembly and a high-temperature-stage refrigeration cycle assembly; the low-temperature-stage refrigeration cycle assembly comprises a pressure-bearing liquid storage tank, and the bottom of the pressure-bearing liquid storage tank is fixedly communicated with a refrigerant liquid outlet. Through high-temperature-stage and low-temperature-stage double-circulation collaborative design and a safe pressure control mechanism, the technical bottleneck of a traditional refrigerating system is broken through, the contradiction that low temperature and safety of traditional high-pressure refrigerating equipment cannot be considered at the same time is solved, stable and safe operation at the ultralow temperature ranging from-20 DEG C to-30 DEG C is achieved, and the refrigerating efficiency is improved. Ultralow-temperature refrigeration is achieved through pressure bearing and high-temperature-level and low-temperature-level double-circulation cooling, so that larger-area refrigeration is achieved through lower temperature, modularized integration of the whole system is achieved through a container, and the adaptive pain point that a traditional refrigeration system is fixedly installed and cannot be moved is solved.

A system includes a pressure exchanger (PX). The PX is coupled to a motor that controls an operating speed of the PX. The system further includes a condenser. An outlet of the condenser is fluidly coupled to a first inlet of the PX. The system further includes a pressure gauge. The pressure gauge is configured to provide first pressure data. The first pressure data is indicative of a pressure of a fluid of the condenser. The system further includes a first controller configured to cause the motor to adjust the operating speed of the PX. The first controller causes the motor to adjust the operating speed of the PX based on the first pressure data.

The invention discloses a cascade refrigerating system and a control method thereof.The cascade refrigerating system comprises a first-stage refrigerating system and a second-stage refrigerating system, the first-stage refrigerating system comprises a first-stage compressor, a dual-system plate heat exchanger, a first-stage throttling mechanism and an evaporative condenser, and the first-stage compressor, the dual-system plate heat exchanger, the first-stage throttling mechanism and the evaporative condenser are connected through pipelines and form a loop; the second-stage refrigerating system comprises a second-stage compressor, a dual-system plate heat exchanger, an evaporative condenser, a temperature adjusting module and an evaporator which are connected through a pipeline and form a loop; the first-stage refrigerating system and the second-stage refrigerating system share the evaporative condenser and the dual-system plate heat exchanger; an inlet of the evaporator is connected with an outlet of the evaporative condenser and an outlet of the oil separator through the temperature adjusting module. An outlet of the evaporator is connected with an air return port of the second-stage compressor, an outlet of the oil separator and an outlet of the evaporative condenser through the temperature adjusting module. According to the invention, the reliability of the cascade refrigeration system and the temperature uniformity of the evaporator are improved.

A refrigeration cycle apparatus includes a first circuit, a second circuit, a cascade heat exchanger, and a control unit. The first circuit circulates a first refrigerant. The second circuit circulates a carbon dioxide refrigerant and refrigerating machine oil. The cascade heat exchanger heats carbon dioxide refrigerant with first refrigerant. The second circuit includes a second compressor and a container. The container is provided on suction side of the second compressor. The container stores the carbon dioxide refrigerant and the refrigerating machine oil. The control unit controls the operation of the first circuit so that the temperature or pressure of the carbon dioxide refrigerant and the refrigerating machine oil in the container is equal to or higher than a predetermined temperature or predetermined pressure corresponding to a boundary temperature at which the density of the carbon dioxide refrigerant and the density of the refrigerating machine oil in the container become equal.

The invention discloses a wide-temperature-range cascade heat pump system, a control method thereof and a lubricating oil system, and relates to the technical field of heat pump systems, in particular to the wide-temperature-range cascade heat pump system which comprises a low-temperature-section circulation subsystem and a high-temperature-section circulation subsystem. The low-temperature section circulation subsystem comprises a low-temperature section evaporator, a low-temperature section compressor, a low-temperature section condenser and a cascade heat exchanger; the high-temperature section circulation subsystem comprises a high-temperature section evaporator, a high-temperature section compressor and a high-temperature section condenser; according to the scheme provided by the invention, the energy consumption can be reduced, the carbon emission is reduced, and the reliability and operation efficiency of equipment are improved.

The present invention discloses an energy storage type high-temperature heat pump steam generation system, which includes a cascade high-temperature heat pump module, a phase change heat storage module and a steam generation module. The cascade high-temperature heat pump module includes a first closed circulation loop formed by connecting in series an air source evaporator, a low-stage compressor, a low-stage electronic expansion valve and the low-temperature side of an inter-stage heat exchanger, and a second closed circulation loop formed by connecting in series a high-stage compressor, a condenser, a high-stage electronic expansion valve and the high-temperature side of the inter-stage heat exchanger; the phase change heat storage module includes a heat storage tank, a heat storage working medium, a heat exchange tube, a first three-way valve, a second three-way valve and a high-temperature circulation pump; the steam generation module includes a flash tank and a steam compressor. By adopting the above technical solution, during the valley electricity period, low-cost electric energy and environmental heat energy are fully utilized for heat charging and energy storage; during the peak electricity period, the stored heat energy is released for steam production, achieving the maximization of economic benefits. The present invention also provides a control method for the energy storage type high-temperature heat pump steam generation system.

The disclosure relates to a method (500) for controlling a decentralized heat pump system (100). The system (100) comprising: a first set (110) of one or more heat pump modules; and one or more second sets (120a-c) of one or more heat pump modules (121, 122, 123, 124); the method (500) 5 comprising: determining (S502) at least one of an outdoor temperature, and data pertaining to an electric grid status of an electric grid (150, 160a-c), determining (S504), based on at least one of said outdoor temperature, and said data pertaining to the electric grid status, and, optionally, a specification of the system (100): an ambient side fluid recirculation loop temperature set 10 point of a working fluid of an ambient side fluid recirculation loop (102); detecting (S506) a temperature of the working fluid of the fluid recirculation loop (102); and controlling (S508) an operation of the first set (110) to adjust the first working temperature of the working fluid of the fluid recirculation loop (102) to match said ambient side fluid recirculation loop temperature set point.

A refrigeration module of a cold space chamber has a blower and an evaporator. A method of controlling the refrigeration module includes defrosting a coil of the evaporator to form a volume of warm air surrounding the coil. The method includes circulating a refrigerant through the evaporator after defrosting the coil, to cool the coil. The method includes operating the blower in a series of pulses to control introduction of the volume of warm air into the cold space chamber.

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.

The invention relates to the technical field of new energy and energy system engineering, in particular to a zero-carbon steam generator which comprises an SOFC power generation system, a cascade heat pump circulation system and a hot water circulation flash evaporation system. The SOFC power generation system supplies power to the cascade heat pump circulation system and the hot water circulation flash evaporation system; a condenser of the high-temperature-stage heat pump subsystem is coupled with a water circulation pipeline of the hot water circulation flash evaporation system for heat exchange so as to provide heat required by flash evaporation; the cascade type heat pump circulation system adopts a natural working medium as a circulation medium, and complete recycling of waste heat and water vapor is achieved. High-temperature waste heat generated by the SOFC power generation system and hydrothermal resources in tail gas are recycled through the cascade heat pump and the steam generation device, and the system is novel and reliable in operation. The device can effectively solve the problems of high energy consumption and high pollution of traditional steam production, widens the hydrogen energy utilization field, and realizes clean energy and efficient utilization.

The invention provides a heat pump and phase change heat storage and cold storage coupled cold and heat combined supply system and a control method thereof. The heat pump and phase change heat storage and cold storage coupled cold and heat combined supply system comprises a two-stage compression heat pump or cascade heat pump, a phase change cold storage device, a phase change heat storage device, a waste heat source, an air cooler, a fourth heat exchanger and a fifth heat exchanger. The first heat exchanger, the first compressor, the second compressor, the third heat exchanger and the first expansion valve sequentially communicate to form a first circulation pipeline. The first heat exchanger, the phase change cold storage device and the fourth heat exchanger are sequentially communicated to form a second circulating pipeline; the third heat exchanger, the phase change heat storage device and the fifth heat exchanger are sequentially communicated to form a third circulating pipeline; the fourth heat exchanger and the waste heat source are sequentially communicated to form a fourth circulating pipeline; and the fifth heat exchanger and the air cooler are sequentially communicated to form a fifth circulating pipeline. The two ends of the two-stage compression type heat pump or the cascade type heat pump are coupled with the phase change cold and heat storage device, large-temperature-difference refrigeration and heat supply are achieved at the same time, the energy use efficiency is improved, and the double requirements for cold and heat of a user are met.

The present invention relates to a heat pump device, which may comprise: an outdoor unit including a switching valve for switching an operation mode, an outdoor compressor which compresses primary refrigerant, an outdoor heat exchanger for performing heat exchange between the primary refrigerant and outdoor air, an outdoor expansion valve for expanding the primary refrigerant, and a plurality of refrigerant flow paths which are connected to the outdoor compressor and through which the primary refrigerant flows to perform the operation mode; an indoor air conditioner including an air conditioning heat exchanger for performing heat exchange between the primary refrigerant and indoor air, and an air conditioning expansion valve for expanding the primary refrigerant; and an indoor water heater including an indoor compressor which compresses secondary refrigerant, a heat storage tank for storing water as a heat medium to perform a heat storage function, a first hot water heat exchanger for performing heat exchange between the secondary refrigerant and the water stored in the heat storage tank, a second hot water heat exchanger for performing heat exchange between the primary refrigerant and the secondary refrigerant, and an indoor expansion valve for expanding the secondary refrigerant.

Systems and methods are provided for providing regenerative heat to a sorbent material and subsequently recovering a majority of the heat. The system and method can be used, for example, for efficient and energy-saving direct capture of carbon dioxide (CO2) from the atmosphere or flue gas. The systems and methods include introducing steam generated by the evaporator into a reactor of the system to directly heat adsorbent material in the reactor and purge desorbed CO2 from the reactor using the steam. Condensed water in the reactor is discharged and returned to the evaporator. The steam and CO2 discharged from the reactor are introduced into a steam recompressor to increase their temperature, then introduced into a condenser or reboiler in which water is condensed and separated from CO2, and the latent heat transferred to the cooling water is recovered, optionally by using a jet ejector.

A compressor unit includes a first case, a first compressor, a cascade heat exchanger, a second compressor, a first connecting port, and a second connecting port. The first compressor, the cascade heat exchanger, and a heat source heat exchanger accommodated in a second case constitute a first refrigerant cycle. The second compressor, the cascade heat exchanger, and a utilization heat exchanger accommodated in a third case constitute a second refrigerant cycle. The first connecting port is connected to the heat source heat exchanger via a first connection piping. The second connecting port is connected to the utilization heat exchanger via a second connection piping.

The invention discloses a double-cascade heat pump defrosting control method and system and a double-cascade heat pump system. The heat pump system comprises a first compressor, a second compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger and a fourth heat exchanger. The first compressor, the first heat exchanger and the second heat exchanger form a preceding-stage temperature processing unit, and the second compressor, the second heat exchanger and the third heat exchanger form a backward-stage temperature processing unit. The fourth heat exchanger is connected with the second heat exchanger in parallel; the defrosting control method comprises the steps that the frequency of the first compressor is reduced to the initial starting frequency; the first cooling medium flows reversely so as to switch from the second heat exchanger to the fourth heat exchanger; the second compressor stops running; the frequency of the first compressor is increased to a defrosting set frequency for defrosting; and the second pipeline is conducted. According to the defrosting control method, the reliability and stability of the defrosting process of the system are effectively improved, the defrosting efficiency is improved, and the possibility that faults occur in the defrosting process of the cascade heat pump system is also effectively avoided.

A heat pump and associated method for storing thermal energy, the heat pump comprising - at least a pair of thermal storage tanks, wherein at least one of said pair of thermal storage tanks is a high temperature tank and at least one another of said pair of thermal storage tanks is a low temperature tank, wherein each of the thermal storage tanks is configured for holding therein a thermal storage substance having a predetermined heat capacity; and - at least one refrigeration cycle for operation of a vapor compression cycle, wherein the high temperature tank and the low temperature tank are each thermally coupled to the refrigeration cycle and configured such that during operation of the vapor compression cycle heat is withdrawn from the thermal storage substance in the low temperature tank to the refrigeration cycle, and simultaneously heat is withdrawn from the at least one refrigeration cycle to the thermal storage substance in the high temperature tank.

The invention discloses a heat exchanger for a two-stage cascade heat pump, and belongs to the technical field of heat pump exchangers, the heat exchanger comprises a case, the case is composed of a supporting frame, a machine bottom support, a protection plate, a machine top cover plate, a main control cabinet and an evaporator, a machine top sector is arranged above the evaporator, and a heat exchange unit is arranged below the evaporator; the heat exchange unit comprises a low-temperature-stage loop and a high-temperature-stage loop, deicing mechanisms are arranged on the two sides of the bottom of the evaporator, air supply mechanisms are arranged on the two sides of the heat exchange unit, and a jet fan is arranged on the outer side of the machine box. The jet fans generate strong cylindrical high-speed airflow, and a large amount of deposited cold air generated in the large array type heat exchanger unit is blown away through relay of the multiple jet fans, so that the phenomenon that the heat exchange effect is affected due to the cold island effect is avoided; the defrosting device has the advantages that cold air around the evaporator is rapidly removed, frost is avoided, the defrosting efficiency is high, and the working stability of the heat pump is high.

To further save energy in addition to energy saving by using a supercooling heat exchanger.SOLUTION: A refrigeration device 10 includes: a main refrigeration circuit 15 filled with a first refrigerant; a supercooling refrigeration circuit 16 filled with a second refrigerant and connected to a supercooling heat exchanger 14; and a controller 100. The supercooling heat exchanger 14 supercools the first refrigerant in the main refrigeration circuit 15. In superheating degree setting control, the controller 100 sets a target value of a superheating degree of the second refrigerant on an outlet side of the supercooling heat exchanger 14 to a first value when a refrigeration request level is a first request value, and sets the target value of the superheating degree to a second value larger than the first value when the refrigeration request level is a second request value lower than the first request value. In the superheating degree setting control, the controller 100 controls a second expansion mechanism 13 on the basis of the target value of the superheating degree.SELECTED DRAWING: Figure 1

The utility model relates to the field of heat pump steam supply, in particular to a stepped heating heat pump steam supply system which is characterized in that a water supplementing pipeline is preheated through a water supplementing preheating device and a heat pump heating device and then provides preheating water for a flash evaporation device, and the water supplementing preheating device can utilize waste heat to preliminarily preheat supplementing flushing water; the heat pump heating device can heat replenished water in a circulating pipeline of the flash evaporation device through the heat exchanger and can also heat replenished flushing water again, so that the replenished water temperature is further increased, high-temperature hot water in the flash evaporation device is replenished into the flash evaporation system, the replenished water temperature of the system is increased, and the energy consumption of the system is reduced. The impact of low water replenishing temperature on stable operation of the system is avoided; the water replenishing preheating device and the heat pump heating device can achieve stepped preheating of water replenishing temperature, waste heat energy is fully utilized, the overall energy consumption of the system is reduced, and the steam generation efficiency is improved.