摘要:
This invention relates to hydrofluorocarbons useful in refrigeration and heat pump applications. The invention provides hydrofluorocarbons selected from the group of 1,1,2,3,3-pentafluoropropane, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,3-pentafluoropropane, and mixtures thereof that are environmentally suitable replacements for chlorofluorocarbons in refrigeration applications such as multi-stage centrifugal chillers.
摘要:
An apparatus and method wherein ozone layer-damaging dichlorodifluoromethane is substituted with a mix of less environmentally damaging refrigerants chlorodifluoroethane and tetrafluoroethane in dichlorodifluoromethane-based air-cooling systems. While less environmentally damaging than dichlorodifluoromethane, the substitute refrigerant has a temperature-pressure relationship similar to that of dichlorodifluoromethane, making the substitute refrigerant suitable for use with dichlorodifluoromethane-based air-cooling systems. The substitute refrigerant can be used alone or in combination with dichlorodifluoromethane. In either event, it is mixed with a relatively small percentage of a hydrophobic lubricating oil which is compatible with both the substitute refrigerant and with dichlorodifluoromethane.
摘要:
An ester blend, including an ester having neopentylglycol and a source of 2-ethylhexanoic acid as its reactive components and an ester having pentaerythritol and a source of 2-ethylhexanoic acid as its reactive components, is especially effective as a lubricant for chlorine-free fluorocarbon refrigerant heat transfer fluids, particularly Refrigerant 134a (1,1,1,2-tetrafluoroethane).
摘要:
A novel refrigerant composition useful as a substitute for HCFC-22, comprising a first constituent of difluoromethane (CH2F2, HFC-32); a second constituent of pentafluoroethane (CHF2CF3, HFC-125); a third constituent of 1,1,1-trifluoroethane (CH3CF3, HFC-143a); a fourth constituent selected from the group consisting of cyclopropane (C3H6, RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), isobutane (CH(CH3)2CH3, R-600a), octafluorocyclobutane (C4F8, RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea), butane (C4H10, R-600), bis(difluoromethyl)ether (CHF2OCHF2, HFE-134) and pentafluoroethylmethylether (CF3CF2OCH3, HFE-245).
摘要:
Composition consisting essentially of 55 to 94% R-125, 2.5 to 35% of R-134a and 3.5 to 25% by weight of DME, and its use as a refrigerant in a heat transfer system designed for R-22 and comprising, as lubricant, a mineral oil or an alkylbenzene oil.
摘要:
The present invention relates to novel refrigerant mixtures as a substitute for chlorodifluoromethane (CHClF2, HCFC-22). More specifically, the invention is directed to refrigerant mixtures that comprise: difluoromethane (CH2F2, HFC-32) as the first component; pentafluoroethane (CHF2CF3, HFC-125) as the second component; 1,1,1,2-tetrafluoroethane (CH2FCF3, HFC-134a) as the third component; any one of cyclopropane (C3H6, RC-270), 1,1-difluoroethane (CH3CHF2, HFC-152a), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), octafluorocyclobutane (C4F8, RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea), bis(difluoromethyl)ether (CHF2OCHF2, HFE-134), pentafluoroethylmethylether (CF3CF2OCH3, HFE-245), n-pentane (C5H12, R-601) and isopentane ((CH3)2CHCH2CH3, R-601a) as the fourth component. The refrigerant mixtures of the invention have working effects equal to that of HCFC-22 but does not have the risk of causing destruction to the ozone layer and can therefore be used as alternative refrigerants to HCFC-22.
摘要:
An absorbent refrigerant composition containing an aqueous solution of zinc and lithium bromides with an added amount of hydroxide ions. The addition of the hydroxide ions lowers the corrosion rate of the composition to an acceptable level without raising the freeze point of the composition. The composition is particularly suitable for use as an absorbent refrigerant composition in the high temperature loop of a dual loop triple effect absorption refrigeration apparatus.
摘要:
Anticorrosion solutions useful for refrigeration processes are disclosed. Halides of Group Va metallic elements can be added to alkali metal halide absorption refrigeration solutions to minimize corrosion of the refrigeration system.
摘要:
A lubricant-refrigerant composition for a compression refrigeration system is disclosed which comprises (A) carbon dioxide refrigerant, and (B) a lubricant of an aliphatic naphthalene. A supplemental lubricant comprising at least one alkyl benzene, a hydrocarbon, a polyalkylene glycol, a polyol ester or a polyvinyl ether may also be present. Additionally, a performance additive comprising an alkoxylated alcohol or phenol, an alkoxylated glycol, an alkyl phenol or a phosphorus compound may also be present.
摘要:
A lubricating oil for compression-type refrigerators using a refrigerant containing pentafluoroethane which lubricating oil comprises a polyvinyl ether compound having (a) a constituting unit represented by general formula (I): or a polyvinyl ether compound having constituting unit (a) and (b) a constituting unit represented by general formula (I′): (wherein R represents a hydrocarbon group which has 1 to 3 carbon atoms and may have ether bond in the group, and R′ represents a hydrocarbon group which has 3 to 20 carbon atoms and may have ether bond in the group) as the main component. The above lubricating oil shows excellent compatibility with hydrofluorocarbon refrigerants containing pentafluoroethane which can replace chlorofluorocarbons causing environmental pollution, has a high volume intrinsic resistance, and exhibits excellent stability and lubricating property.