46 results about "Natural refrigerant" patented technology

In order to provide a thermo-siphon chiller refrigerator for use in cold districts which performs natural refrigerant-circulation refrigerating cycle and also can perform a forced refrigerant-circulation refrigerating cycle when outside air temperature is high by using an indoor heat exchanger, an outdoor heat exchanger, and a compressor, and combining them with refrigerant piping, the thermo-siphon chiller refrigerator for use in cold districts of the invention has a compressor (10) additionally installed to a natural refrigerant-circulation refrigerating system comprising an outdoor heat exchanger (12), an indoor heat exchanger (11) located at a position lower than that of the outer heat exchanger (12), and an expansion valve (18). When the refrigerating capacity of the natural refrigerant circulation refrigerating system is not sufficient, the additional compressor (10) is operated to perform a forced refrigerant-circulation cycle i.e. a vapor compression refrigerating cycle.

The present invention provides lubricating oil for a compression refrigerator, characterized by including an alkylene glycol or polyoxy alkylene glycol unit and a vinyl ether unit in a molecule and containing a polyvinyl ether compound having a molecular weight of 300 to 3,000. The lubricating oil for a compression refrigerator has a high viscosity index and excellent compatibility under a natural refrigerant atmosphere such as carbon dioxide.

A thermal separator / power generator uses the thermodynamic properties of refrigerant substances to provide supplemental heating, cooling, and power without emitting any additional greenhouse gases to the environment by utilizing waste or unused heat energy. This is accomplished through the combined operation of a Rankine Cycle Generator using a refrigerant, preferably a natural refrigerant such as NH3, as the working fluid, and a CO2 a vapor compression heat pump cycle, also called a Thermal Separator Module. The combined system is called a Thermal Separator / Power Generator. It produces electrical power and simultaneously produces secondary heating and water or air cooling as byproducts. In the combined vapor compression heat pump / Rankine power generator cycle, waste heat from external source(s) are recovered and used for heating in the Rankine power cycle. The CO2 heat pump provides cooling and optional space or process heating in lieu of heat boost efficiency for the Rankine power generator cycle.

A natural refrigerant low-pressure shell-type rotary compressor in which the amount of oil contained on the high-pressure side is reduced with sufficient lubrication and sealing performance at a sliding section secured. The compressor has a rotary refrigerant compression mechanism provided in a low-pressure enclosed container and having vanes, an oil separation element for separating lubricating oil from the refrigerant, and an oil supply passage for supplying the separated lubricating oil to a vane back pressure chamber of the compression mechanism, a crankshaft, a bearing, a cylinder, a piston, and oil supply spaces between the vanes. Vane skip is suppressed, and efficient lubrication and high sealing performance at the sliding section and a reduction in the amount of the oil contained on the high-pressure side are achieved at the same time. The compressor is highly reliable, is of low cost, has high performance, and uses a reduced amount of refrigerant.

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.

A refrigerating machine oil composition according to the invention comprises an alicyclic polycarboxylic acid ester compound obtained from the following compounds (a) to (c):(a) an alicyclic polycarboxylic acid having an alicyclic ring and two or more carboxyl groups, or its derivative, wherein at least two of the carboxyl groups are bonded to mutually adjacent carbon atoms on the alicyclic ring;(b) a compound with two or more hydroxyl groups or its derivative; and(c) a compound with one hydroxyl group or its derivative.It can be used together with HFC refrigerants and natural refrigerants such as carbon dioxide and hydrocarbons, to provide a satisfactory balance between all of the properties of lubricity, miscibility with refrigerants, heat and hydrolytic stability and electric insulating property.

The present invention provides lubricating oil for a compression refrigerator, characterized by including an alkylene glycol or polyoxy alkylene glycol unit and a vinyl ether unit in a molecule and containing a polyvinyl ether compound having a molecular weight of 300 to 3,000. The lubricating oil for a compression refrigerator has a high viscosity index and excellent compatibility under a natural refrigerant atmosphere such as carbon dioxide.

A refrigerating system includes: an evaporator (2) for performing a cooling operation as a refrigerant is evaporated; a compressor (4) for compressing the refrigerant discharged from the evaporator as a mover is reciprocally moved; a condenser (86) for changing the refrigerant compressed in the reciprocating compressor to a liquid refrigerant; and a capillary tube (8) for decompressing the refrigerant discharged from the condenser and transferring it to the evaporator. Hydrocarbon consisting of carbon and hydrogen, a sort of natural refrigerant, is used as the refrigerant, and a paraffin-based lubricant, a sort of a mineral oil, is used as the lubricant, so that a lubricating performance and a performance of the refrigerating system can be improved.

The invention discloses a method and a device for desalinating seawater by airflow impact, rotating suspension and freezing. According to the method and device, cold airflow is sprayed into a seawater freezing desalinating chamber through a nozzle; water is atomized through another group of nozzles and then sprayed into the seawater freezing desalinating chamber; two airflows are sprayed into the seawater freezing desalinating chamber through the nozzles which are at different angles in the horizontal direction and grouped along the vertical height direction; the atomized airflows are of density difference along the height direction, and the nozzles are uniformly peripherally distributed, so that the airflows suffer from impact rotating and suspension in the seawater freezing desalinating chamber; the atomized drops moving from bottom to top can be frozen into ice crystal particles under the effect of evaporating and freezing of the cold airflows, and the ice crystal particles continuously grow; after growing to exceed the bearing capacity under the effect of airflows, the ice crystal particles fall to a sieving plate at the lower part of the seawater freezing desalinating chamber and can be recovered to obtain the ice particles with expected dimension. The method and device have the advantages that natural refrigerant can be utilized and water is not polluted; the device is simple in structure and small in energy consumption, does not need operation under vacuum, and realizes continuous operation.

A refrigerator oil composition includes: a synthetic base oil; and a partial hydrocarbyl ether of an aliphatic polyhydric alcohol condensate, in which the aliphatic polyhydric alcohol condensate includes a condensate of 4 to 20 molecules of a hindered glycol and / or an aliphatic polyhydric alcohol having 3 to 6 hydroxyl groups. The refrigerator oil composition is preferably used in a compression refrigerator that uses a hydrofluorocarbon, a natural refrigerant such as a hydrocarbon, carbon dioxide, or ammonia, a mixed refrigerant of fluoroiodomethane and propene, an unsaturated fluorinated hydrocarbon, a fluorinated ether, a fluorinated alcohol, a fluorinated ketone, or a mixture thereof as a refrigerant, has a low coefficient of friction, and is excellent in energy-saving property.

The invention discloses a carbon dioxide heating and cooling combined system. The system adopts two parts; one part adopts R134a as a high temperature part of a refrigerant, and the other part adopts carbon dioxide as a low temperature part of the refrigerant. The carbon dioxide heating and cooling combined system has the beneficial effects that: all of the refrigerant adopted by the system is an environment-friendly refrigerant; R134a is a medium-low-temperature environment-friendly refrigerant which is widely popular at present; carbon dioxide is adopted as a pure natural refrigerant; an ozone layer depletion potential value is 0; a global warming potential value is 1; carbon dioxide has relatively high unit volume refrigerating capacity and has excellent thermodynamic property; the system can completely recycle heat of condensation to generate high-temperature hot water, medium-temperature hot water and low-temperature hot water; an expansion machine which is additionally arranged in the system utilizes energy lost by throttling and reducing pressure, improves back pressure of carbon dioxide and greatly improves the efficiency of the whole system; heat of condensation of an additional support system is completely utilized by the system to increase a back temperature of carbon dioxide.

A reciprocating compressor includes a driving unit (10) disposed inside a hermetic container (86) and generating a reciprocal motional force, a compression unit (10) for performing a compressing operation on a refrigerant upon receiving the reciprocal motional force generated from the driving unit (8); and a lubrication unit (12) for supplying a lubricant to each motional portion of the driving unit (8) and the compression unit (10) to perform a lubrication operation. Hydrocarbon consisting of carbon and hydrogen, a sort of natural refrigerant, is used as the refrigerant. The lubricant is a paraffin-based mineral lubricant, which is a sort of mineral oil and well harmonized with the natural refrigerant used for a refrigerator. Accordingly, a lubricating performance is improved and thus a performance of the reciprocating compressor can be enhanced.

The invention discloses a double-effect ground source heat pump system. An air cooler consists of a surface cooler and an evaporator by series connection on the basis of the original heat pump circulating unit, and an outlet of the surface cooler is sequentially connected with an exhaust valve, a blower and a blow valve. An underground water source water supply pipe is connected with an electric three-way valve in series, one path of the three-way valve is connected with an inlet of the surface air cooler; and the other path is connected with the evaporator. An underground water source water return pipe is connected at the water outlet side of the condenser, and an air return valve is connected with a fresh air valve in parallel and then the two are connected at the inlet side of the surface air cooler. The double-effect ground source heat pump unit can not only carry out the air regulation in transitional season of summer to achieve the energy-saving effect, but can also regulate the system by the ground source energy storage, thereby improving the using effect and the service life of a ground source well. The system can effectively reduce the power consumption of an air-conditioner in summer by the double-effect cooling technology. As the unit is arranged outdoors, a natural refrigerant can be used on the selection of working medium, thereby avoiding the personal injury caused by the leakage of the natural refrigerant.

The invention related to a passive heat pipe natural refrigerant machine room air-conditioning system and a control method thereof. The machine room air-conditioning system comprises a passive heat pipe circulation system and an auxiliary cold source system. The passive heat pipe circulation system comprises at least one heat pipe evaporator, a heat pipe condenser and a heat transferring medium pressurization unit, wherein the heat pipe evaporators are arranged in a room, the heat pipe condenser is connected with the heat pipe evaporators and used for cooling a heat pipe heat transferring medium, the heat transferring medium pressurization unit is connected with the heat pipe evaporators and the heat pipe condenser, and the heat transferring medium pressurization unit is used for transporting the heat pipe heat transferring medium cooled by the heat pipe condenser to the heat pipe evaporators. The auxiliary cold source system comprises a heat exchanger which is arranged outdoors, the heat exchanger can be used for heat exchange between the heat pipe heat transferring medium and an auxiliary cold source, and the heat exchanger comprises a cold source inlet end and a cold source outlet end which are connected with the auxiliary cold source; a heat transferring medium inlet end of the heat exchanger is connected with an outlet of the heat pipe condenser, and a heat transferring medium outlet end of the heat exchanger is connected with an inlet of the heat transferring medium pressurization unit. According to the passive heat pipe natural refrigerant machine room air-conditioning system, the natural cold source can be fully utilized for refrigeration, and energy conservation of the machine room is achieved; meanwhile, heat is transferred by using heat pipe phase change, andthe heat transferring efficiency is high.

In a Stirling cooling apparatus, a refrigerant is circulated within a refrigerant circulation circuit in such a way that the refrigerant receives cold, as latent heat, from a Stirling chiller and then releases the cold, by absorbing heat of vaporization, as it vaporizes in an evaporator, thereby cooling the inside of a refrigerator chamber. As the refrigerant, carbon dioxide, a natural refrigerant, can be suitably used.

A refrigerant system utilizes environmentally friendly natural refrigerant such as carbon dioxide. A pressure relief mechanism such as pressure relief valve is incorporated into the refrigerant system design to allow for at least some amount of refrigerant to be released to atmosphere to provide safe operation or comply with agency regulations if pressure within the refrigerant system exceeds a certain limit. This release can occur during refrigerant system storage, transportation or operation. A detection device such as an electrical circuit is included into the refrigerant system design to provide an indication that pressure relief valve has opened, such that the determination can be made by a refrigerant system control or an operator whether the refrigerant system needs to be recharged and whether it can continue its normal operation, narrow its operational envelope or shut down until the refrigerant charge can be restored.

A refrigerator oil composition includes: a synthetic base oil; and a partial hydrocarbyl ether of an aliphatic polyhydric alcohol condensate, in which the aliphatic polyhydric alcohol condensate includes a condensate of 4 to 20 molecules of a hindered glycol and / or an aliphatic polyhydric alcohol having 3 to 6 hydroxyl groups. The refrigerator oil composition is preferably used in a compression refrigerator that uses a hydrofluorocarbon, a natural refrigerant such as a hydrocarbon, carbon dioxide, or ammonia, a mixed refrigerant of fluoroiodomethane and propene, an unsaturated fluorinated hydrocarbon, a fluorinated ether, a fluorinated alcohol, a fluorinated ketone, or a mixture thereof as a refrigerant, has a low coefficient of friction, and is excellent in energy-saving property.

This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of −10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.

The invention provides a sliding member which is able to further improve wearability and is not maintained for a long time by using substitute refrigerant without chlorine or natural refrigerant and a scroll motor compressor using the sliding member. The invention forms an oxydizing membrane layer (14) on the surface of the sliding member (8) formed by sintered iron, and forms an intermediate layer (15) on the oxidizing membrane layer (14), and forms an oxide layer (14A) and forms a hard carbon membrane layer (16) on the intermediate layer (15). As above, the surface of the sliding member (8) is orderly formed with the oxydizing membrane layer (14), the oxide layer (14A), the intermediate layer (15) and the hard carbon membrane layer (16), so as to contact the hard carbon membrane layer (16) with excellent wearability and low friction with the surface of the sliding member (8) and not to maintain for a long time.

A reciprocating compressor comprising a drive unit (10) disposed within a sealed housing (86) and generating a reciprocating force; for performing compression on a refrigerant when subjected to a reciprocating force generated by the drive unit (8) a compression unit (10) for operation; and a lubrication unit (12) for supplying lubricant to the drive unit (8) and the compression unit (10) to complete the lubrication operation. Hydrocarbons consisting of carbon and hydrogen, a natural refrigerant, are used as refrigerants. The lubricant is a paraffin-based mineral lubricant, which is a mineral oil and harmonizes well with the natural refrigerants used in refrigerators. Therefore, the lubricating performance is improved and thus the performance of the reciprocating compressor can be enhanced.

A refrigerating device includes a compressor, a gas cooler, an expansion mechanism, an evaporator, a four-way valve, and a drying device sequentially connected by using refrigerant pipes. The refrigerating device uses a refrigerant mixture in which a combustible natural refrigerant and a carbon dioxide refrigerant are mixed, and the content of the carbon dioxide refrigerant in the refrigerant mixture is 20 to 50 mass %, or a maximum fill amount of the combustible natural refrigerant is 150g.

The invention discloses a cab CO2 refrigerant variable-frequency air conditioner. The air conditioner comprises a condensation cavity and an evaporation cavity. The condensation cavity comprises a compressor, a gas cooler and a condenser fan. The evaporation cavity internally comprises an evaporator and a first expansion valve and further comprises an economizer and a heat regenerator. An air conditioning unit uses CO2 as a refrigerant which is an environment-friendly natural refrigerant. By means of the economizer and the heat regenerator, the refrigerant is cooled multiple times, and the energy efficiency ratio of the unit is improved. Active protection of a system is realized through the arrangement of a pressure relief valve, a temperature sensor and a pressure sensor.

To reduce wear of a movable scroll or the like generated when HFCs refrigerant not containing chlorine and of poor wear resistance characteristics or natural refrigerant such as CO2 of which use pressure is high is used or when a machine is operated at high load. In a sliding part surface of the movable scroll 3, anodic oxidation layer 36 of improved surface roughness is provided on a surface layer of the sliding surface of the movable scroll by removing a predetermined thickness from the sliding part surface after anodic oxidation treatment process. Consequently, a fluid machine of which movable part is light and of which sliding part is excellent in wear resistance is provided easily at low cost.

The present invention provides a ternary natural refrigerant mixture containing R-600a (isobutane), R-600 (isobutane), and R-290 (propane) that can be used in single or dual evaporator refrigeration systems to provide for more energy efficient cooling than a single refrigerant such as R-134a without having to change the compressor design, which can add to manufacturing costs. For example, the ternary natural refrigerant mixture can be used in a refrigeration system that uses dual evaporators to provide more efficient cooling. The refrigeration system can be used in, e.g., a refrigerator having a fresh food compartment and a frozen food compartment to provide separate cooling to each compartment simultaneously.

An integrated refrigeration and air conditioning plant working with environmentally friendly natural refrigerant carbon dioxide (CO2) and an ozone friendly non CO2 refrigerant. The low temperature refrigeration is provided by evaporating CO2 and the fluid is used as a secondary refrigerant, predominantly in liquid mode, for medium temperature refrigeration. The heat rejection from CO2 occurs to another upper stage cascaded refrigeration system that operates with a ozone friendly non CO2 refrigerant. Since air conditioning applications require cooling at temperatures higher than refrigeration for food sector, cooling for this range is derived from the non CO2 refrigerant.

To obtain water-dispersible varnish used in an alternative refrigerant / refrigerating machine oil refrigerant system or a natural refrigerant / refrigerating machine oil refrigerant system, the water-dispersible varnish being capable of solving two problems, namely, reducing the volatile components and the like during thermal curing and resistance of the cured varnish to the refrigerant system.Water-dispersible varnish having a specific thermosetting resin as base polymer, a specific vinyl monomer as reactive diluent, organic peroxide as reaction initiator, and water mixed therein.