CN110437915B - Refrigerator oil for hydrofluoroolefin mixture refrigerant and refrigerator system - Google Patents

Refrigerator oil for hydrofluoroolefin mixture refrigerant and refrigerator system Download PDF

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CN110437915B
CN110437915B CN201810419689.XA CN201810419689A CN110437915B CN 110437915 B CN110437915 B CN 110437915B CN 201810419689 A CN201810419689 A CN 201810419689A CN 110437915 B CN110437915 B CN 110437915B
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refrigerant
hydrofluoroolefin
oil
refrigerating machine
refrigerator oil
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CN110437915A (en
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黄小龙
张利
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Shanghai Highly Electrical Appliances Co Ltd
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Shanghai Highly Electrical Appliances Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/30—Refrigerators lubricants or compressors lubricants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

The present invention provides a refrigerator oil for a hydrofluoroolefin mixture refrigerant, and a refrigerator system, wherein the refrigerator oil contains 98.8-99.8 mass% of polyol ester, 0.1-0.35 mass% of antioxidant, and 0.1-0.85 mass% of acid scavenger. By improving the components and the characteristics of the refrigerating machine oil, the invention improves the solubility of the refrigerating machine oil in the hydrofluoroolefin mixture refrigerant, so that the refrigerating machine oil is better suitable for the hydrofluoroolefin mixture refrigerant, and the performance and the reliability of a refrigeration equipment system are improved.

Description

Refrigerator oil for hydrofluoroolefin mixture refrigerant and refrigerator system
Technical Field
The invention relates to the technical field of refrigeration, in particular to refrigerator oil for a hydrofluoroolefin mixture refrigerant and a refrigerator system.
Background
In view of international convention and relevant laws and regulations, refrigerant with high environmental protection characteristic is gradually adopted to replace traditional refrigerant in the refrigeration system at present. The environmental characteristic assessment indexes of the refrigerant mainly comprise two global warming potential values ODP and GWP. The refrigerant which is developed at present and meets the environmental assessment index and can be used for replacing the traditional refrigerant mainly comprises hydrofluoroolefin mixture refrigerant, such as R452B refrigerant (XL55) and R454B refrigerant (XL 41).
In refrigeration systems, such as compressors, in addition to refrigerant, refrigerating machine oil is included which serves the most basic lubricating and wear reducing function. The refrigerating machine oil takes away heat generated by friction, reduces the working temperature of a friction surface, reduces the abrasion loss of parts, can seal each leakage gap, reduces the leakage of a refrigerant from a high-pressure cavity to a low-pressure cavity, and improves the performance of the compressor.
Therefore, the refrigerating machine oil must have certain compatibility with the refrigerant to ensure the normal operation of the refrigerating system. It is generally desirable that the refrigerant be immiscible with the refrigerant oil within the compressor so that the refrigerant exiting the compressor does not carry the refrigerant oil into the system; but inevitable, the vaporific refrigerating machine oil and a small amount of refrigerating machine oil dissolved in the refrigerant can be brought into the system, at this moment, the condenser is in a high-temperature state, the evaporator is in a low-temperature state, therefore, in the two temperature areas, the refrigerant and the refrigerating machine oil should be mutually dissolved as completely as possible, so that the phenomenon of 'oil retention' in the system can not occur, the refrigerating machine oil can be brought back to the inside of the compressor smoothly through the refrigerant loop in which the refrigerating machine oil is dissolved, and the reliability of the compressor is ensured.
Therefore, with the trend that the traditional refrigerant is replaced by the hydrofluoroolefin mixture refrigerant, the refrigerating machine oil suitable for the refrigerant needs to be developed, the refrigeration system and the refrigerating machine oil are ensured to be matched with each other when the refrigeration system works, and the system performance and reliability are improved.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The invention provides a refrigerator oil for a hydrofluoroolefin mixture refrigerant and a refrigerator system, aiming at adjusting the compatibility of the refrigerator oil and the refrigerant, developing the refrigerator oil suitable for a novel refrigerant and meeting the reliability requirement of a refrigeration system.
According to one aspect of the present invention, there is provided a refrigerator oil for a hydrofluoroolefin mixture refrigerant, the refrigerator oil comprising, based on the total mass of the refrigerator oil:
98.8 to 99.8 mass% of a polyol ester;
0.1 to 0.35 mass% of an antioxidant and 0.1 to 0.85 mass% of an acid scavenger.
Preferably, in the refrigerating machine oil for the hydrofluoroolefin mixture refrigerant, the kinematic viscosity of the refrigerating machine oil at 40 ℃ is 15-79.8 mm2/s。
Preferably, in the refrigerating machine oil for the hydrofluoroolefin mixture refrigerant, the kinematic viscosity of the refrigerating machine oil at 40 ℃ is 52.8-75 mm2/s。
Preferably, the first and second electrodes are formed of a metal,in the refrigerating machine oil for the hydrofluoroolefin mixture refrigerant, the kinematic viscosity of the refrigerating machine oil at 40 ℃ is 64-72 mm2/s。
Preferably, in the refrigerating machine oil for the hydrofluoroolefin mixture refrigerant, the density of the refrigerating machine oil at 15 ℃ is 0.928-0.992 g/cm3。
Preferably, in the above refrigerating machine oil for a hydrofluoroolefin mixture refrigerant, the pour point of the refrigerating machine oil is-35 ℃ or lower, and the flash point of the refrigerating machine oil is 200 ℃ or higher.
Preferably, in the above-mentioned refrigerator oil for a hydrofluoroolefin mixture refrigerant, based on the total mass of the refrigerant: the refrigerator oil is dissolved in the refrigerant in any proportion within the temperature range of 0-50 ℃;
in a temperature interval lower than 0 ℃, the dissolving proportion of the refrigerator oil in the refrigerant is increased along with the temperature increase;
in a temperature range higher than 50 ℃, the dissolving proportion of the refrigerator oil in the refrigerant is reduced as the temperature is increased.
Preferably, in the above-mentioned refrigerator oil for a hydrofluoroolefin mixture refrigerant, the hydrofluoroolefin mixture refrigerant is R452B refrigerant.
Preferably, in the above-mentioned refrigerator oil for a hydrofluoroolefin mixture refrigerant, the hydrofluoroolefin mixture refrigerant is R454B refrigerant.
According to another aspect of the present invention, there is provided a refrigerator system containing a working fluid including a hydrofluoroolefin mixture refrigerant and the above-described refrigerator oil.
Compared with the prior art, the invention has the beneficial effects that:
the invention develops the refrigerating machine oil suitable for the hydrofluoroolefin mixture refrigerant by adding a proper amount of additives into the refrigerating machine oil and adjusting the compatibility of the refrigerating machine oil and the hydrofluoroolefin mixture refrigerant.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 is a graph showing the dissolution behavior of a refrigerating machine oil in a hydrofluoroolefin mixture refrigerant of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
The refrigerator oil provided by the invention is suitable for a hydrofluoroolefin mixture refrigerant, and mainly comprises base oil and additives. The base oil is the main component of the refrigerator oil, determines the basic properties of the refrigerator oil, and the additive can make up the deficiency in the performance of the base oil and is an important component of the refrigerator oil. The refrigerating machine oil plays a vital role in a refrigerating system such as a compressor, can take away heat generated by friction, reduce the working temperature of a friction surface and reduce the abrasion loss of parts besides the most basic lubricating and antifriction effects, and can seal various leakage gaps in the compressor, reduce the leakage of a refrigerant from a high-pressure cavity to a low-pressure cavity and improve the performance of the compressor.
Specifically, the refrigerator oil of the present invention comprises 98.8 to 99.8 mass% of a polyol ester as a base oil, and 0.1 to 0.35 mass% of an antioxidant and 0.1 to 0.85 mass% of an acid scavenger as additives, based on the total mass of the refrigerator oil.
The base oil is POE (polyolefin Ester) oil, which is also called polyester oil and is a synthetic Polyol Ester oil, and the POE oil can be well applied to HFC (hydrofluorocarbon) refrigerant systems. The antioxidant is 2, 6-di-tert-butyl-4-methylphenol with chemical name DBPC. The chemical name of acid scavenger is CGE.
Further, the kinematic viscosity of the refrigerator oil at 40 ℃ is 15-79.8 mm2In a more preferred embodiment, the kinematic viscosity of the refrigerator oil at 40 ℃ is 52.8 to 75mm2And s. In a more preferred embodiment, the kinematic viscosity of the refrigerator oil at 40 ℃ is 64 to 72mm2And s. The density of the refrigerator oil at 15 ℃ is 0.928-0.992 g/cm3The pour point is less than or equal to-35 ℃, and the flash point is more than or equal to 200 ℃.
Further, the refrigerator oil of the present invention has other characteristics as shown in the following table 1:
table 1-table of characteristic values for refrigerator oils:
Figure BDA0001650369030000041
Figure BDA0001650369030000051
among them, the "JIS" test method is a test method conforming to international standards.
The refrigerator oil of the invention has greatly improved stability and reliability by improving the proportion of the base oil and the additive and various characteristics.
Further, in addition to the above-mentioned properties, the refrigerating machine oil must have a certain compatibility with the refrigerant to enable the normal operation of the refrigeration system. It is generally desirable that the refrigerant be immiscible with the refrigerant oil within the compressor so that the refrigerant exiting the compressor does not carry the refrigerant oil into the system; but inevitable, vaporific refrigerator oil and a small amount of refrigerator oil dissolved in the refrigerant can be brought into the system, at this moment the condenser is in a high-temperature state, the evaporator is in a low-temperature state, therefore in these two temperature areas, the refrigerant and the refrigerator oil are mutually soluble as completely as possible, so the phenomenon of 'oil retention' will not occur in the system, the refrigerator oil can be brought back to the inside of the compressor smoothly through the refrigerant loop in which the refrigerator oil is dissolved, thereby ensuring the reliability of the compressor.
In view of international convention and relevant laws and regulations, refrigerant replacement is actively carried out in the refrigeration and air conditioning industry at present, the refrigerant replacement firstly needs to have environmental protection characteristic (ODP is 0, low GWP), and secondly the physical property of the refrigerant replacement needs to be as close as possible to the original refrigerant, so that the replacement cost is reduced.
Aiming at the traditional refrigerant R410A, two hydrofluoroolefin mixture refrigerants for replacing R410A are developed in the industry at present, specifically R452B refrigerant (XL55) and R454B refrigerant (XL41), wherein R452B refrigerant GWP is 676, which is reduced by 65% compared with R410A and is A2L refrigerant (ultra-low class). The physical properties of R452B are very close to those of R410A, the sliding temperature is low, and the replacement cost is greatly reduced.
With this trend toward refrigerant replacement, the solubility of the refrigeration lubricant in the refrigerant also needs to be improved to better accommodate the hydrofluoroolefin blend refrigerant, which in combination increases the performance and operational stability of the refrigeration system.
The invention develops the refrigerating machine oil suitable for the R452B refrigerant by adjusting the compatibility of the refrigerating machine oil and the R452B refrigerant aiming at the physical property characteristics of R452B, and the abrasion loss of each part of the R452B refrigerating system adopting the refrigerating machine oil is within the specification value after a long-term life test, thereby completely meeting the reliability requirement of the R452B refrigerating system. Furthermore, the reliability check is satisfied, and the compatibility test of the materials of the refrigerating machine oil and the R452B refrigerant is performed, so that the compatibility test of the refrigerating machine oil and the R452B refrigerant at different temperatures under different working conditions is satisfied.
Specifically, a graph showing the dissolution characteristics of the refrigerator oil of the present invention in a hydrofluoroolefin mixture refrigerant (mainly, R452B refrigerant in this example) is shown in fig. 1. In the temperature range of 0-50 ℃, the refrigerator oil is dissolved in the R452B refrigerant according to any proportion; in the temperature range lower than 0 ℃, the dissolving proportion of the refrigerator oil in the R452B refrigerant is increased along with the temperature increase; in the temperature range higher than 50 ℃, the dissolving ratio of the refrigerator oil in the R452B refrigerant decreases as the temperature increases. Therefore, the refrigerant is separated from the refrigerating machine oil in the compressor, and the refrigerant discharged from the compressor can not bring the refrigerating machine oil into the system; in a specific temperature area, the refrigerant and the refrigerating machine oil are mutually soluble as completely as possible, so that the refrigerating machine oil is smoothly brought back to the interior of the compressor through a refrigerant loop in which the refrigerating machine oil is dissolved, and the reliability of the compressor is ensured.
Referring to fig. 1, more specifically, in a temperature range of 0 to 50 ℃, the refrigerating machine oil and the R452B refrigerant are compatible at any weight ratio; in the interval that the temperature is lower than 0 ℃ and the refrigerating machine oil accounts for less than 20% of the mass percent of the R452B refrigerant, the higher the temperature is and the lower the weight percent of the refrigerating machine oil is, the better the compatibility between the refrigerating machine oil and the R452B refrigerant is; in the interval that the temperature is lower than 0 ℃ and the refrigerating machine oil accounts for more than 20 percent of the mass percent of the R452B refrigerant, the higher the temperature and the higher the weight percent of the refrigerating machine oil, the better the compatibility of the refrigerating machine oil and the R452B refrigerant is; in the interval that the temperature is higher than 50 ℃ and the refrigerating machine oil accounts for less than 20% of the mass percent of the R452B refrigerant, the higher the temperature and the lower the weight percent of the refrigerating machine oil, the better the compatibility of the refrigerating machine oil and the R452B refrigerant; in the range where the temperature is higher than 50 ℃ and the refrigerating machine oil accounts for more than 20% by mass of the R452B refrigerant, the higher the temperature and the higher the weight% of the refrigerating machine oil, the better the compatibility between the refrigerating machine oil and the R452B refrigerant. In practical applications, the temperature critical point and the weight ratio critical point of the refrigerant oil and the R452B refrigerant, which are dissolved and separated, may be adaptively changed according to the difference of the working environment of the refrigeration system, and the present invention is not limited thereto.
In another preferred embodiment, the present invention also provides a chiller system containing a working fluid comprising a hydrofluoroolefin hybrid refrigerant and a chiller oil suitable for the hydrofluoroolefin hybrid refrigerant.
For example, the refrigerating machine system is a rolling rotor compressor, or a refrigerating apparatus using the compressor, and the refrigerating apparatus has a refrigerant and a refrigerating machine oil composition therein, wherein the refrigerant is a hydrofluoroolefin mixture refrigerant, such as R452B refrigerant or R454B refrigerant, and the refrigerating machine oil is refrigerating machine oil suitable for the refrigerant. The refrigerant and the refrigerator oil can improve the operating performance and reliability of a refrigerator system such as a compressor and a refrigeration equipment.
In summary, the invention develops the refrigerating machine oil suitable for the hydrofluoroolefin mixture refrigerant by adding a proper amount of additives into the refrigerating machine oil and adjusting the compatibility of the refrigerating machine oil and the hydrofluoroolefin mixture refrigerant, and after a long-term life test of a refrigerating system adopting the refrigerating machine oil, the abrasion loss of each part is within a specification value, thereby completely meeting the reliability requirement of the refrigerating system.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (7)

1. A refrigerator oil for a hydrofluoroolefin mixture refrigerant, wherein the hydrofluoroolefin mixture refrigerant is R452B refrigerant or R454B refrigerant, and the refrigerator oil comprises, based on the total mass of the refrigerator oil:
98.8 to 99.8 mass% of a polyol ester, the polyol ester being a polyester oil;
0.1 to 0.35 mass% of an antioxidant and 0.1 to 0.85 mass% of an acid scavenger;
based on the total mass of the hydrofluoroolefin mixture refrigerant:
the refrigerator oil is dissolved in the hydrofluoroolefin mixture refrigerant in any proportion within the temperature range of 0-50 ℃;
in a temperature range lower than 0 ℃, and when the refrigerating machine oil accounts for less than 20% of the mass of the hydrofluoroolefin mixture refrigerant, the dissolving proportion of the refrigerating machine oil in the hydrofluoroolefin mixture refrigerant is increased along with the increase of the temperature and the reduction of the weight% of the refrigerating machine oil;
in a temperature range lower than 0 ℃, and when the refrigerating machine oil accounts for more than 20% of the mass of the hydrofluoroolefin mixture refrigerant, the dissolving ratio of the refrigerating machine oil in the hydrofluoroolefin mixture refrigerant is increased along with the increase of the temperature and the increase of the weight percent of the refrigerating machine oil;
in a temperature range higher than 50 ℃, and when the refrigerating machine oil accounts for less than 20% of the hydrofluoroolefin mixture refrigerant by mass, the dissolving proportion of the refrigerating machine oil in the hydrofluoroolefin mixture refrigerant is increased along with the decrease of the temperature and the decrease of the weight% of the refrigerating machine oil;
in a temperature range higher than 50 ℃, and the mass percent of the refrigerator oil in the hydrofluoroolefin mixture refrigerant is more than 20%, the dissolving proportion of the refrigerator oil in the hydrofluoroolefin mixture refrigerant is increased along with the decrease of the temperature and the increase of the weight percent of the refrigerator oil.
2. The refrigerator oil for a hydrofluoroolefin mixture refrigerant according to claim 1, wherein the kinematic viscosity of said refrigerator oil at 40 ℃ is 15 to 79.8mm2/s。
3. The refrigerator oil for a hydrofluoroolefin mixture refrigerant according to claim 2, wherein the kinematic viscosity of said refrigerator oil at 40 ℃ is 52.8 to 75mm2/s。
4. The refrigerator oil for hydrofluoroolefin mixture refrigerant of claim 3, wherein said refrigerator oil has a kinematic viscosity at 40 ℃Is 64 to 72mm2/s。
5. The refrigerator oil for a hydrofluoroolefin mixture refrigerant according to claim 1, wherein the density of the refrigerator oil at 15 ℃ is 0.928 to 0.992g/cm3。
6. A refrigerator oil for a hydrofluoroolefin mixture refrigerant according to claim 1, wherein the pour point of said refrigerator oil is-35 ℃ or less and the flash point of said refrigerator oil is 200 ℃ or more.
7. A chiller system containing a working fluid, characterized in that the working fluid comprises a hydrofluoroolefin blend refrigerant and a chiller oil according to any one of claims 1 to 6.
CN201810419689.XA 2018-05-04 2018-05-04 Refrigerator oil for hydrofluoroolefin mixture refrigerant and refrigerator system Active CN110437915B (en)

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