57results about How to "Improve refrigeration cycle efficiency" patented technology

In a refrigerant cycle apparatus, an energy-saving operation is performed by using a refrigerant which is used in a supercritical state. A refrigeration cycle apparatus is constituted by a main compressor, an expander, a sub compressor independently placed in an upstream side of the main compressor, a use side heat exchanger, a heat source side heat exchanger and the like. A refrigerant such as a carbon dioxide or the like which is used in a supercritical state is employed as the refrigerant. The sub compressor is driven by utilizing a recovered energy by the expanding device. Further, a refrigerant tank is provided, and properly controls an amount of the refrigerant circulating in the refrigerant cycle.

Provide a composite cooling and heating system with a heat pump system and a floor heating system. The heat pump system uses carbon dioxide as a natural refrigerant, and has a compressor connected by a refrigerant pipe, a four-way valve, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger. and multiple heat exchangers for hot water supply. A floor heating system has a heating water supply pipe for circulating heating water and a heating water regulating valve for regulating the flow of heating water.

The invention discloses an energy-saving ultralow-temperature preservation box which comprises a high-temperature refrigerating cycle unit and a low-temperature refrigerating cycle unit. The high-temperature refrigerating cycle unit and the low-temperature refrigerating cycle unit are coupled together by a heat exchanger; the high-temperature refrigerating cycle unit comprises a cycle compressor, a condenser, a first drying filter, a first capillary tube, a first automatic control valve component and a second capillary tube; and the low-temperature refrigerating cycle unit comprises a low-temperature compressor, an oil separator, a first heat regenerator, a second heat regenerator, a first drying filter,, a second drying filter, a third capillary tube, a second capillary tube, a first, automatic control valve component, a second automatic control valve component, a third automatic control valve component, a fourth automatic control valve component, a fifth automatic control valve component and an evaporator. The high-temperature refrigerating cycle and the low-temperature refrigerating cycle are coupled to realize low-temperature refrigeration, and the heat regenerating cycle form and the capillary tube energy-saving cycle form are used to improve the regenerating cycle efficiency. The energy-saving ultralow-temperature preservation box has the characteristics of high temperature decreasing speed, high regenerating efficiency, safety, reliability, energy saving and environment friendliness and can meet the regenerating requirement of the low-temperature environment of 50-90 DEG C below zero.

The invention relates to a FLNG/FLPG oil gas pretreatment and liquefaction method which comprises the following steps: 1) arranging an oil gas pretreatment and liquefaction system comprising a natural gas pretreatment system, a light hydrocarbon recovery and separation system, a propane precooling system, a liquefaction supercooling system and a plurality of cold boxes; 2) transmitting natural gas mixture transmitted via a submarine pipeline to a slug flow capturer, then, sending natural gases flowing out of a natural gas pipeline to the natural gas pretreatment system, and sending condensated oil flowing out of a condensated oil pipeline to the light hydrocarbon recovery and separation system; 3) carrying out deacidification, dehydration and demercuration pretreatment on the natural gases flowing out of the natural gas pipeline; 4) carrying out light hydrocarbon recovery and separation on the natural gases obtained after the pretreatment; 5) carrying out propane circulation precooling on the natural gases obtained after the light hydrocarbon recovery; and 6) carrying out liquidation and supercooling circulation processing on the natural gases obtained after the precooling. The method can well solve the problems that in an existing liquidation process, maritime applicability is poor, conventional nitrogen expansion process processing capacity is weak, and efficiency is low. The method can be widely applied to the FLNG/FLPG oil gas pretreatment and liquefaction process.

The invention relates to an air separation device for preparing oxygen and nitrogen through isobaric separation. In the air separation device, a Rankine cycle system with a similar thermal energy power cycle device at a low-temperature end is adopted, a liquid nitrogen washing process is adopted, and cold is replenished to the air separation device through a liquid nitrogen washing cold-replenishing system, so that nitrogen and oxygen can be prepared by performing isobaric separation on the air. Compared with the conventional advanced unit, the air separation device has the advantages that on the premise of the same refrigerating capacity, energy is saved by over 30 percent compared with the traditional advanced unit, equipment and materials are saved, and operation and adjustment are performed flexibly and conveniently; and meanwhile, multiple pressure grades and multi-gas supply can be realized conveniently through the air separation device, so that low-energy-consumption concentrated air supplying can be realized, the conventional air separation technology and theory are broken through, and remarkable economic, social and environmental protection benefits are achieved.

The present invention relates to a multi-cylinder rotary compressor and a refrigeration circulation device, wherein the multi-cylinder rotary compressor can realize improvement of manufacturing performance and machining precision. The refrigeration circulation device comprises the multi-cylinder rotary compressor for realizing increase of the refrigeration circulation efficiency. In the multi-cylinder rotary compressor (C), a first cylinder (6A) and a second cylinder (6B) which are separated by a middle baffle (2) are provided as a compression mechanism part (3). Cylinder chambers (Sa,Sb) for introducing low-pressure gas are provided at the inner-diameter part. The blade back chambers (11a,11b) are provided on each cylinder chamber through blade grooves (10a,10b) which movably accommodate the blades (12a,12b). The first blade back chamber comprises a spring component (13) which exerts an elastic force to the back end of the blade and causes the front end of the blade to contact with a circumferential wall of a roller (9a). The second blade back chamber is closed by a closing component (15) and a middle baffle, wherein the closing component is formed separately from the auxiliary bearing. The closing component is connected with a pressure control pipe (16) for switching the high-pressure gas and the low-pressure gas for supplying, and is also provided with a guiding path (17) for communicating the closing component with the second blade back chamber.

The invention relates to an expansion machine for the refrigeration cycle, belonging to the refrigeration technical field. The expansion machine comprises an expansion turbine (10) and a nozzle (41) for injecting the refrigerating working substance to the expansion turbine (10), wherein, the expansion turbine (10) comprises a disc-shaped body part (11) and a plurality of periphery protrusions (12) which have injection-receiving surfaces (121) and periphery surfaces (122) and extend in radial along the body part (11); wherein, the injection-receiving surfaces (121) are parallel with the radial of the disc-shaped body part (11); the periphery surfaces (122) are perpendicular to the radial of the disc-shaped body part (11). The expansion machine for the refrigeration cycle has the characteristic that the energy recovery efficiency of the expansion turbine is raised by the simple structural design.

The invention relates to frequency conversion type water cycle heat pump air conditioning unit in refrigeration technology field. It includes given frequency compressor, changed frequency compressor, oil separator, water-cooled condenser, liquid receiver, thermostatic expansion valve, refrigerant liquid supply tube, valve, evaporator, refrigerant liquid back tube, cooling tower, cooling water supply tube, supply valve, and back tube, water pump, and cooling water back valve. It adopts water cycle heat pump to improve refrigeration circular efficiency, and adopts two compressors according to demand.

The invention discloses a water cooling-assisted heat removal system, which comprises a coiled pipe air radiator (2), and is characterized in that a set of water cooling-assisted radiator (1) which takes tap water (3) as a water source is connected in series to the front part of the coiled pipe air radiator (2); the water cooling-assisted radiator (1) comprises a water tank (11) and radiating pipes (12); the water tank (11) of the water cooling-assisted radiator (1) is connected in series with a water pipe; and the radiating pipes (12) are arranged inside the water tank (11), and are connected in series between a compressor and the coiled pipe air radiator (2). According to the water cooling-assisted heat removal system, air and the tap water (3) are combined for assisting in radiating, and the startup time of a compressor and the cycle period of a refrigerant are reduced in comparison to an air heat removal way, so that the effects of increasing the heat removal efficiency and saving electric energy are achieved; when the temperature of tap water is high, the heat removal capability is attenuated without influencing the air heat removal effect, and excessive influences on the conventional design are avoided; and the water cooling-assisted heat removal system is easy to arrange and popularize.

The invention relates to a natural gas constant-pressure liquefaction device. A Rankine cycle system which is arranged at a low-temperature end and similar to a thermal power cycle device is used in the natural gas constant-pressure liquefaction device. A low-temperature pump is adopted to input power, and the natural gas constant-pressure liquefaction device is cooled through refrigerants in a compensating mode so as to achieve constant-pressure liquefaction of natural gas. On the premise of the same refrigerating capacity, compared with a traditional advanced set, the natural gas constant-pressure liquefaction device saves energy by more than 30%, and is a breakthrough of a traditional natural gas liquefaction technology, and is obvious in economic, social and environment protection benefits.

A refrigeration device having a closed circuit in which a flow rate of coolant is circulating is provided. The closed circuit has a condenser and a main branch provided with a reciprocating compressor inside which a defined flow rate of the coolant enters, from the main branch, at a defined suction pressure, of an evaporator and a first expansion valve that is arranged between the condenser and the evaporator. The closed circuit further has a first secondary economizer branch for a first fraction of flow rate of the coolant, the first secondary economizer branch fluidically connecting the compressor to a section of the closed circuit between the condenser and the first expansion valve, wherein the compressor has a first side inlet port for the entrance of the first fraction of coolant flow rate.

The invention provides a heat pump type heat-supplying machine for an air conditioner implementing the improvement of the refrigerating circulative efficiency of the refrigerating heat-storing operation. The invention comprises the refrigerating circulation having a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, a throttle mechanism; a high temperature heat storing water tank for storing the hot water which is heated as the high temperature via the heat exchange by the outdoor heat exchanger; and a low temperature heat storing water tank for storing the hot water which is heated as the low temperature via the heat exchange by the outdoor heat exchanger; in the heat pump type heat-supplying machine for an air conditioner, the conditioner stores the high temperature hot water to the high temperature heat storing water tank in the night power operation under the situation of reducing charging at the deep nights; and the conditioner stores the low temperature hot water to the low temperature heat storing water tank in the night power operation under the situation of charging at the deep nights; the invention uses the high temperature hot water in the high temperature heat storing water tank and the low temperature hot water to the low temperature heat storing water tank in mixing way.

The invention discloses a refrigerating and circulating method with multi-stage throttles, a same number of throttle devices are arranged according to the number of compartments in a refrigerating system, each throttle device is corresponding to a refrigerating compartment and arranged in front of the refrigerating compartment, all of the refrigerating compartments are arranged in series based on work temperatures thereof from higher to lower, in the whole refrigerating system, a refrigerating actuating medium grades and throttles based on a rule that an evaporation temperature of an evaporator in each refrigerating compartment is from higher to lower, so as to achieve and hold a set temperature of each refrigerating compartment. A refrigerating device designed according to the invention, has a simply designed structure, is capable of farthest reducing non-reversible loss of temperature difference heat diffusion when a heat exchanging temperature difference of each refrigerating compartment evaporator in a refrigerating device such as a refrigeratory, an icebox, or the like satisfies request of thermodynamics, heat transfer theory and hydrodynamics, effectively avoiding characteristics of big heat exchanging temperature difference and big non-reversible loss in the refrigerating compartments during conventional refrigerating and circulating, and increasing a refrigerating and circulating efficiency.

The invention provides a method for measuring the mixing velocity of gas-liquid two-phase flow of a refrigerant, and a matched measuring device. The method comprises the following steps of: measuring the fluid mass flow m of the refrigerant in a refrigeration circuit and the jet impact force of a nozzle outlet, and calculating the average mixing velocity V1 of the gas-liquid two-phase flow which is sprayed by a nozzle and has phase change according to the law of momentum. The measuring method is simple and practical, the influence of a structural parameter of the nozzle on outlet velocity and the energy conversion efficiency of the nozzle can be further studied according to data obtained by studying the mixing velocity of the gas-liquid two-phase flow at the nozzle outlet, the design parameter of the gas-liquid two-phase flow nozzle is optimized, and the efficiency of the whole refrigeration cycle is improved.

The invention discloses a scroll compressor, which comprises a shell, a crank shaft, a stander, a movable scroll disc, a fixed scroll disc, a gas suction pipe, an exhaust hole, an exhaust return stop mechanism and an exhaust pipe, wherein the crank shaft is arranged in the shell; the stander is arranged on the crank shaft; the movable scroll disc is arranged at the top end of the crank shaft and is positioned above the stander; the fixed scroll disc is arranged above the movable scroll disc and is mutually engaged with the movable scroll disc; the gas suction pipe is arranged on the fixed scroll disc and is communicated with a compression chamber which is formed by engaging the movable scroll disc with the fixed scroll disc; the exhaust hole is formed in the top of the fixed scroll disc and is communicated with the central compression chamber; the exhaust return stop mechanism is arranged above the fixed scroll disc and is communicated with the exhaust hole; the exhaust pipe is arranged below the stander; both the gas suction pipe and the exhaust pipe extend out of the shell; the outer wall of the stander is provided with an exhaust passage; and the exhaust passage has a divergent structure from top to bottom. The scroll compressor has a simple structure; only the groove shape of the exhaust passage is required to be changed; through the structure of the exhaust passage, the flow velocity for flowing a refrigerant into a low-pressure chamber is reduced, which contributes to oil-gas separation, and the noise level is reduced; and meanwhile, the degree of superheat of the refrigerant which enters the low-pressure chamber is reduced, so that the refrigeration cycle efficiency of the refrigerant is increased.

The invention discloses a refrigerating system of three-stage flash-evaporation ejection economizers. The refrigerating system comprises an evaporator, a compressor, a condenser, a first-stage high-pressure flash-evaporation-tank economizer, a first-stage ejector, a second-stage flash-evaporation-tank economizer, a second-stage ejector and a third-stage economizer. The refrigerating system has a simple structure, high practicability and great using value, and is convenient to use; flash refrigerant steam produced by each stage of economizer is ejected and concentrated into a highest-pressure economizer and enters the compressor for compressing, and a liquid refrigerant produced by the economizers is ejected and concentrated into a lowest-pressure economizer and enters the evaporator for secondary evaporation, so that the refrigerating cycle efficiency of the economizers is remarkably increased.

Crossover criticality carbon dioxide refrigeration and ferriswheel desiccation combined type air conditioning system is of the refrigeration and air conditioning technique field, comprising major loop evaporator, ferriswheel dehumidifier, auxiliary loop evaporator and secondary accessory gas cooler, arranged in turn in the direction of air current flowing from the room outside to inside, first accessory gas cooler, major gas cooler, 8electric heater and ferriswheel dehumidifier arranged in turn in the direction of air current flowing from the room inside to outside, and compressor, flow control valve, first accessory gas cooler, stop valve, auxiliary loop evaporator, major loop throttle valve and major loop evaporator, with carbon dioxide as refrigeration working medium. The invention is benefit for increasing efficiency of refrigeration cycle, reducing energy cost of ferriswheel dehumidifier with environmental protection.

This refrigeration cycle device is provided with: a compressor (11) that suctions and discharges a coolant; an air-coolant heat exchanger (12) that exchanges heat between air and the coolant; an expansion valve (15) that reduces the pressure of the coolant; a heating medium-coolant heat exchanger (13) that exchanges heat between a heating medium and the coolant; a cold heat utilization apparatus (23) that uses the cold heat of the heating medium; a warm heat utilization apparatus (24) that uses the warm heat of the heating medium; a coolant flow switching valve (16) that switches between a heating medium cooling mode for cooling the heating medium with the heating medium-coolant heat exchanger (13) and a heating medium heating mode for heating the heating medium with the heating medium-coolant heat exchanger (13); and heating medium flow switching devices (25, 26) that switch the flow of the heating medium such that, in the heating medium cooling mode, the heating medium circulates between the heating medium-coolant heat exchanger (13) and the cold heat utilization apparatus (23), and in the heating medium heating mode, the heating medium circulates between the heating medium-coolant heat exchanger (13) and the warm heat utilization apparatus (24).