AU2003294544B2

AU2003294544B2 - Refrigerant composition

Info

Publication number: AU2003294544B2
Application number: AU2003294544A
Authority: AU
Inventors: James W. Flowers
Original assignee: PROTOCOL RESOURCE MAN Inc; Protocol Resource Management Inc
Current assignee: Protocol Resource Management Inc
Priority date: 2003-01-16
Filing date: 2003-12-23
Publication date: 2007-07-05
Anticipated expiration: 2023-12-23
Also published as: WO2004063307A1; CA2416385C; CA2416385A1; AU2003294544A1; JP2006513283A

Description

WO 2004/063307 PCTiCA20031002016 -1- REFRIGERANT COMPOSITION BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The invention relates to a refrigerant composition for use in a compressortype refrigerating apparatus. Specifically, the invention relates to refrigerants containing HFC compounds in place of environmentally-harmful chlorinated 1o flourocarbons.

DESCRIPTION OF THE PRIOR ART Conventional commercially-available refrigerants typically comprise a mixture of various components including one or more fluorocarbons. Such refrigerants are widely used as refrigerants in air conditioning systems, refrigerators and other heat pump applications. Conventional heat pumps operate on a principal of cyclic compression and decompression of the refrigerant, which may undergo a phase conversation between liquid and gas. Heat is absorbed or removed from a space by changing the refrigerant from a liquid to a gas or otherwise reducing the pressure of the refrigerant. The refrigerant is then compressed within a compressor, which significantly raises the pressure of the vapour. The high pressure vapor is conveyed to a condenser, and undergoes a heat exchange with a cooler medium such as the surrounding air. The release of heat energy to the surrounding air causes the refrigerant to drop in temperature and condense to a liquid. The cooled liquid refrigerant is transmitted back to the cool side, and passed through an expansion valve which lowers the pressure of the liquid causing the liquid vaporize by absorbing heat energy from the surrounding air, thus commencing the cycle again.

It has been found that certain refrigerants possess good qualities for use with such a system, owning to their ability to undergo a phase change at or near WO 2004/063307 PCT/CA2003/002016 -2the temperatures usually found at the warm anu .uui oiua uL me ilt- pur li>, under pressures readily obtainable by an inexpensive compressor. Until recently, chlorofluorocarbons were in widespread use, either in the form of a single compound or isotropic mixtures containing one or more chlorofluorocarbons (CFCs). In recent years, environmental considerations have placed severe restrictions on the use of CFCs, as these have been found to cause damage to the earth's ozone layer. In response to this challenge, alternative refrigerants were developed containing hydrofluorocarbons refrigerants, thus avoiding the use of environmentally-harmful chlorinated compounds. The prior art to discloses various multi-component HFC mixtures. By way of several representative examples: Japanese Patent No. JP 8-337774 discloses refrigerant mixtures comprising HFC refrigerants, also including phosphoric ester surfactants in an ethanol solution. The mixture contains a relatively large amount of ethanol. US Patent 6,035,648 to Hickman et al. discloses a refrigerant mixture consisting of R- 32, R-125 and R-134a in the approximate ratio of 25/25/50. A different mixture of the same three components is disclosed in US Patent 5, 736,063, to Richard et al.

This reference also discloses two component mixtures, and mixtures containing propane as a component, as well as carbon dioxide. US Patent 5,709,092 to Shiflett discloses a mixture of the same three components, in the range of 5-59% HFC 125; 5-59% HFC 32; and 5-35% HFC 134 or 134a. Propane also is disclosed as an additional component. A mixture of the same three components is disclosed in US Patent 5,647,224, to Kushiro et al.

Desirably, a refrigerant should be chemically stable, possessed of low toxicity and suitable for use in a mechanical system in which the refrigerant is exposed to lubricants and metals, without causing corrosion or excessive lubricant degradation.

In a further aspect, a refrigerant should be miscible with the lubricants used in a variety of refrigerating devices. Conventional CFC-free refrigerants are not suitable for use in a range of refrigerating devices but rather they typically are WO 2004/063307 PCT/CA2003/002016 -3formulated to work in a single type of device. I lY LIl UMI.; employ mineral oil as a lubricant, the refrigerant should be miscible with this lubricant. Conventional HFC refrigerants tend to be not miscible or easily miscible with mineral oil and are thus not suitable for such uses. It is desirable to provide a CFC-free refrigerant suitable for use in a number of different types of refrigerating devices, in order to simplify fabrication and maintenance of a variety of such devices.

SUMMARY OF THE INVENTION The present invention comprises a mixture of three HFC refrigerants components, along with an alcohol. The alcohol must have a suitable critical temperature which is compatible with the use of the refrigerant. Preferrably a lower alkyl or branched alkyl alcohol including methanol or ethanol. The most preferred is ethanol, preferably anhydrous ethanol. The function of the alcohol is to improve miscibility with lubricants typically found in refrigerating devices, in particular mineral oils of the type used in the mechanical components of existing R22 based refrigerating systems. The three HFC components are HFC 32, HFC 125 and HFC 134a. Optionally, the mixture includes a fifth component, namely a lower alkyl hydrocarbon such as R290 (propane) or isobutane. The refrigerant of the present invention is formulated into a composition compatible with and suitable for use in at least one conventional refrigerating device and preferrably several such devices, i.e. having a vapour pressure or critical temperature which is similar to that of conventional refrigerating devices.

Without wishing to be restricted to any theory, it is believed that the addition of the alcohol component enhances the performance of the composition by altering the viscosity of the oil that becomes entrained within the refrigerant during operation of the refrigerating device.

The composition of the present invention comprises HFC 32 in the amount of about 20% to 26% by weight; HFC 125 in the amount of about 22% to 28% by 03/05 '07 THU 17:35 FAX 61 8 82119433 Lescar Perrin 0 o07 4 Sweight and HFC 134a, in the amount of about 49% to 53.3% by weight; and lower C alkyl alcohol in the amount of about 0.6% to 0.8% by weight.

SIn one aspect, the refrigerant comprises the following formulation: In a still more preferred embodiment, the mixture comprises HFC 32 at about 23% by weight; HFC 125 at about 25% by weight, HFC 134a at about 51.3% by weight and ethanol in the amount of about 0.7% by weight.

(c O 10 Optionally, an additional component is added to the mixture, namely a lower C alkyl hydrocarbon in the amount of between 0% and 4.0% by weight. "Lower alkyl" means a straight or branched chain Ci-Ce with a preferred species being isobutane propane with propane being most preferred. Suitable alkyls are those which exist in the gas phase at room temperature and atmospheric pressure. Another suitable lower alkyl is isobutane.

The term "about" used herein means a variation of +0.1 from the expressed percentages.

DETAILED DESCRIPTION OF THE INVENTION Having generally described the invention, a detailed and specific example is presented which is within the scope of the invention but which is merely illustrated of the invention.

Example A refrigerant composition SP22C was formulated, consisting of a mixture of HFC 32 (difluoromethane) at 23% by weight, HFC 125 (pentafluoroethane) at by weight, HFC 134a 1, 1, 2 tetrafluoroethane) at 51.3% by weight; and anhydrous ethanol at 0.7% by weight. In the example, it is believed that all of the above amounts were within 0.1% of the expressed amount.

COMS ID No: SBMI-07237244 Received by IP Australia: Time 17:25 Date 2007-05-03

IND

O

The order of introducing components into the composition is not of any consequence. Conventional methods were used to formulate, store and use the Scomposition.

The mean boiling point (BP) of the above mixture was measured at 40.1 °C 1 atm.

The critical temperature (CT) of the mixture was determined to be 86.0 °C.

For purposes of comparison, the corresponding BP of the common refrigerant N R22 is -40.8 °C 1 atm.

In testing, the above composition was found to be miscible in the following mineral oils: 4GS and 3GS, which are typically found in existing R22 based systems.

The composition was also found to be effective as a refrigerant working fluid.

Table 1' shows data generated from testing on R22, a prior art CFCcontaining refrigerant. The test was carried out over four cycles, at an ambient temperature of 27.8°C Tables 2 through 5 data generated from similar tests carried out on the composition of the above example, (identified as composition SP 22 C) indicating level of performance for the present formulation.

Tables 2, 3 and 4 show test data relating to testing of SP 22 C running in the same R22 rated unit as the data of Table 1, at three different ambient temperature and humidity conditions. Hence, test A (Table 2) was carried out with an indoor dry and wet bulb temperature condition of 26.7°C (80°F) and 19.4 0 C (67 0 F) respectively and an outdoor dry bulb temperature of 35C In test B (Table 3) the respective conditions were 26.7 0 C (80 0 F)/13.9 0 C (57 0 F) and 27.8 0 C (82 0 In test C (Table 4) the comparative conditions were 26.7 0 C (80°F)/13.9 0 C (57 0 F) and 27.8°C (82 0 In test D (Table 5) the comparative conditions were: 26.7"C (80 0 F)/13.9°C (57F) and 27.8 0 C (82 0 The test data of Figure 5 (test D) is a "cycle test" to verify consistency in the test data. That is, the test machine charged with compound SP 22 C is cycled on and

IND

0 off in predetermined intervals to ensure that the data generated in the previous tests C is repeatable with little or no deviation, to illustrate that such a unit can cycle d independently with little loss of efficiency.

Although this invention has been described by way of a preferred embodiment, it will be seen by one skilled in the relevant art or arts that the full scope of this invention includes any number of variations of and departures from the described non-limiting example. The full scope of this invention is best described by N the claims set out in this specification.

0 CIn any claims that follow and in the summary of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprising" is used in the sense of "including", i.e. the features specified may be associated with further features in various embodiments of the invention.

WO 2004/063307 -7- Table I Unit: mI t HiRA0185060 FZRP024tLO68 Date: 6103102 Voltage: 208 VAC 60 Hz Run: #16 Test 0. 80/S7-82 Barometer. 29.09" tHg Charge: R-22, 3.90 lbs PCT/CA2003/002016 Yoe I Uycle 1- -VY~2 cycler z 1cII 3- ycle 3 S 4.1 GC~e 4 off on Off on Off on Off on Location~ Average IAverage Average Average Average Average Ayerage Average Unfts Suction PSIG 145.73 82.00 145.70 80.74 145.21 79-08 80.20 PSIG Saturation Temp. NIA 46.79 WIA 48.02 MIA 46-95 HtA 47.68 Deg. IF Suction Compressor 101.05 68.31 95.79 69.31 94.01 69.23 93.46 78.09 Deg. F Superheat NIA 19.52 MIA 2129 NIA 22-28 MIA 22.41 Deg. IF Discharg COMP, P814) 148.50 227.31 148.53 226.97 14B.98 226.82 148.80 226.72 PSIG Saturation Temnp. NIA 110.28 N/A 110.18 -N/A 110-13 WIA 110.10 Deg.IF Discharge Conip 97.25 159.39 94.83 156.95 94.15 156.90 93.79 155.90 Deg. F Liquid 0D Colt P814) 148.03 212.34 148.10 212.82 148.59 213.77 148.40 212.88 PSIG Saturation Temp. WA 105.52 H/A 105.68 WA 105.99 WA 105.70 Deg. F Leaving 04) W1i 80.69 94.34 80.66 94.11 80.71 94.29 80.65 94.18 Deg. F Lquid Q IDCoil PSIG 148.58 211.00 148.71 211.30 1.48.6 212.95 148.59 211.88 PS SaturationTemp. WA 105.08 WA 105.18 N/A 105.72 WA 105.37 Dog. F Liquid IP Coil 79.76 93.45 80.16 93.27 80.31 93A3 80.29 93.29 Deg. F subcoof NA 11.63 WIA 11.91 WIA 12.29 W/A 12.08 Deg.IF Vapor ID Co-l PSIG 147.25 84.72 147.26 83.54 147.73 81.79 147.69 82.88 PSIG Saturation Temp. NIA 60.44 MIA 49-72 N/A 48.66 NIA 49.32 Dog. F Leaving ID Coft 75.85. 63.51 76.49 65.61 76.85 65.72 76.95 66.24 Deg. F Compressor Dome 113.64 102.62 106.13 97.75 103.52 95.99 102.60 95.75 Deq.F Compressor Sump 120.09 111.21 111.16 105.08 108.28 103.37 107.37 102.64 Deg- F tntet Grid 80.15 79.92 80.14 79.92 80.13 79.98 .80.14 79.95. Dog. IF Discharge Grid 71.72 63.24 12-69 63.30 73.00 62.86 73.26 63.36 Dog. IF Tunnel Grid 67.95 66.51 70.53 67.11 71.13 67.07 71.2 67.34 Deg. F tndoor Dry Bulb 80.08 79.85 80.06S 79.85 80.04 79.86 80.04 79.87 Dog. F idoor Wet Bulb 59.21 59.09 5D.37 65.45 69.67 59.59 60.48 63.31 Dog. F CI102.3 0D Dry Bulb 81.90 82.26 81.93 82.33 81.01 82.31 81.93 82.32 Deg.IF El102.4 00 Wet Bulb 60.02 8020 60.12 60.40 00.15 60.29 60.20 60.40 Dog. F Discharge Dry Bulb 87.36 69.79 69.31 70.71 69.87 7D.93 70.12 71.18 Dog. F Discharge Wet Bulb 65.17 65.48 65.95 56.11 56.27 56.11 50.24 58.30 Dog. F stow"r Watts 0.00 0.36 0.00 0.35 0.00 0.35 0.00 0.35 KCW Condensing Unit Watts 0.00 1.55 0.00 1.50 0.00 1.67 0.00 1.67 K(W Net Air Side Capacity HIA 209.92 NIA 210.08 NIA 210.38 N/A 210.4 Volts Voltage B to C N/A 208.58 NIA 200.77 N/A 209.09 NIA 209.19 Volts Voltage L2 toN 14/A 119.30 NfA 119.35 N/A 119.51 N/A .119.52 Volts Voltage L.3 to N MIA 121.88 MIA 122.07 WIA 122.28 N/A 122.33 Volts AMPS 2 MIA 9.28 NIA 9.30 WA. 9.28 N/A 9.30 Amps AMPS 3 MIA 9.29 W/A 9.31 NIA 9.31 MIA 9.33 Anmps kWatts TOTAL WIA 1.91 W/A 1.91 WA 1.92 N/A 1.92 KW IFREQ. WA 59.91 W NA I59.93 ITA ,59.90 N/A 59.94 H~z WO 2004/063307 mai.wturer: Protocol Table2 Unit: m HIRA018506D F2RPO24N06GB Dato: 6130102 Voltagqe: 208 VAO 60 Hz Run: 1A Test A 80167-96" Barometer: 29.06" Hg Charge: 813-22C. 3.70 Ilbs 2 Saturation Temp. 51.15 lDeg. F 3 Suction Compressor 62.30 Deg. F 4 Superheat 11.16 Deg. F Discharge Q Comp. PSIG 272.00 PSIG 6 Saturation Temp. 113.00 Deg. F 7 Discharge Comp. 162.08 Deg. F a Liquid ig OD Coll PSIG 259.47 PSIG 9 Saturation Temp. 112.00 Deg. F Leavinig 0O) Coil 110.90 Deg. F 11 I quid ID Coil PSI6 256.37 PSIG 12 Saturation Temp. 112,00 Deg. F 13 Liquid 11D Ccii 109.42 Deg. F 14 Subcool 2.62 Deg. F Vapor (M ID Coil PSIG 89.10 PS16 15.1 Saturation Temp. 51.50 Deg. F 17 Leaving ID Coil 60.90 Deg. F 18 Compressor Dome 101248 Deg. F 19 Compressor Sumap 119.50 Peg. F Tunnel Grid 65.95 Deg. F 22 Discharge Airflow 877.00 SCFM 23 Static 0.10 in Water 24 Condensate from ID Coil 15.46 Oz Indoor Dry Bulb 80.01 Deo. F 26 Indoor Wet Bulb 67..12 Deg. F 27 El 02.3 00 Dry Bulb 95.01 Deg. F 28 Ell 02.4 OP Wet Bulb 67.65 Deg. F 29 Discharge Dry Bulb 64.78 Deg. F Discharge Wet Bulb 61.30 Deg. F 31 Blower Watts 0.34 KW 32 Condensing Unit Watts 1.70 KW 33 Voltage A to B 208.86 volts -34 Voltage S to C 207.70 volts Voltage L2 to N 118.27 Volt 36 Voltage L3 to N 122.04 Volts 37 AMPS 2 9.93 Amps 38 AMPS 3 0.07 Amps 39 kWatts TOTAL 2.04 KIN FREQ. 59-98 H~z 41 Gross Air Side Capec*t 18910.8 Btu f H 42 Net Air Side Capacity 17150.4 Btu I H 43 EER 8.41 Btu IW*H 44 Cato. Sensible Cap. 14575.07 Btu Sensible Condensate 16623.52 Btu Condensate Balance 103.1695 %AirlICond.

PCTiCA20031002016 WO 2004/063307 Manufacturer- Protocol Table 3 Unit:. M HIRADI 8606D F2R11O4N168 Date: 5131102 Voltage: 208 VJAC 60 Hz Run: 2A Test E. 80167-.82** Barometer: 29.02" H~g Charge: SP-22C, 3.70 lbs 2 Saturation Temp. 46.05 Deg. P~ 3 Suction 0 Compreswo 68.99 Dog. r 4 Superheat 20.G4 Deg. F Discharge Q Comp. PSI$ 231.45 PSIG' 6 Saturation Temp, 104 Dog. F 7 Discharge Comp. 155.37 Dog. F 8 Liquid Q0OD Cogl PSIG 217,43 P=1 9 Saturation Temp. 99.2 Deg, F Leaving.003 Coil 98.19 Dog. F I1I Liquid Q ID Coil PSIG 216.30 PSIG 12 Saturation Temp, 99 Dog. F 13 Liquid 0 10 Coil 97.37 Deg. F 14 Subcool 1.63 Deg. F Vapor Q ID Coil I'SIG 84.10 PSIG 15.1 Saturation Temp. 49.5 Dog. F 17 Leaving ID Coil 62.05 Deg. F 18 Compressor Dome 98.86 Deg. F 19 Compressor Sump 113,88 Deg. F -21 Tunnel Grid 66.28 Dog. F 22 Discharge Pirilow 875.4 SCFM 23 Static 0"1 In Water 24 Condensate fromt ID Coil 25.15 0z Indoor Drty Bulb 80.01 Dog. F 26 Indoor Wet Bulb 67.01 Dog. F 27 El 02.3 oD Dry Bulb 82.01 Deg. F 281 E 102.4 0D Wet Bulb 62.96 Deg. F 29 Discharqa Dry Bulb 64.24 Dog. F Discharge Wet Bulb 60.53 Deg. F 31 slower Watts o.34 KWV 32 Condensing Unit Watts 1 .67 KWN 33 Voltage A to B 208.74 Volts 34 Voltage 8 to C 207,74 Volts Voltage LZ to N 123.57 Volts 36 Voltage U3 to N 118.43 Volt 37 AMPS 2 9.32 Amps 38 AMPS 3 9.33 Amps 39 kWatts TOTAL 1.91 KW FREQ. 59.92 Hz 41 Grota Air Side Capacit 20070.1 Bt"/HI 42 Net Air Side Capacity 18909.6 Btu Ill 43 EER 9.9 BtuW*H 44 Cale. Sensible Cap. '16045.48. Btu Sensible Condensate 18377.86 Btu Condensate Balance 102 .8934 Air!I Cond.

PCTiCA20031002016 WO 2004/063307 Manlujacturer: Protocol Table 4 Unit: M X HIRABIBS5USD F2RP024N068 Date: 5131102 Voltage: 208 VAC 60 Hz Run,: f 3A Test C, 80167-82" Barometer: 28.94" Mg Charge: SP-22G, 3.70 lbs PCTiCA20031002016 2 3 4 6 7 121 13 14 1511 17, 18 19 20-1 21 22 23 24 26 27 28 29 32 33 34 36 37 38 39 41 42 43 [LOCSUOfl Sufcaon IG. /D.Wo Saturation Temp. 44.60 Deg. F Suction Q Compressor 62.53 Deg. F Superheat 17T93 Deg. F Discharge Comp- PSIG 229A2 PSIG Saturation Temp. 104.00 Deg. F Discharge Comnp. 153.69 0"g. F Liquid 0OD Coil PSIG 215.79 PSI G Saturation Temp. 98.90 Deg. F Leaving 0OD Coil 97.54 Deg. F Liquid ID Coil PSIG 215.08 PSIG Saturation Temp. 99.80 Deg. F Liquid ID Coil 96.93 Deg. F Subcoal 2.87 Deg. F Vapor ID Coil PSIG 50.98 PSIG Saturation Temp. 45.80 Deg. F Leaving ID Coll 59.49 Deg. F Compressor Dome 96.92 Deg. F Compressor Sump 112.34 Deg. F Inlet Grid 80.13 Peg, F Discharge Grid 61.54 Peg. F Tunnel Grid 652.72 Deg. F Discharge Airflow 877.70 SCFM Static 0.10 In Water Condensate from ID Coil N/A .Oz Indoor Dry Bulb 80.00 Dog. F Indoor Wet Bulb 58.79 Deg. F E102.5 OD Dry Bulb 82.00 Deg, F E 102.4 OD Wet Bulb D03 eg. F Discharge Dry Bulb 61.57 Deg. F Discharge Wet Bulb 51.73 Peg. F Blower Watts 0.34

KW

'Condensing Unit Watts 1.58 KW Voltage A to 8 208-31 Volts Voltage B to C 206.51 volts 'Voltage L2 to N 118.28 Volts Voltage [S to N 120.97 Volts AMPS 2 9.23 Amps A.MP$ 3 0.28 Amps kWatts TOTAL 1.90 ICN FREQ. 69.97 Hz Gross Air Side Capacity 18438-1 Stu I H Net Air Side Capacity 17277.7 Btu I H EER 9.09 Btu I H- WO 2004/063307 PCTiCA20031002016 Ma. acturer ProtocolTal Unit: M HIRAD1 85060 F2RP024NO6BTal5 Date: 5131102 Voltage. 208 VAC 60 lHz' -2 Run: 4A Teest D, 80f67.3~ Barometer: 28.94" Hg Ch-arge: SP-22C, 3.70 lbs Off On off on Off on off on 0 Location Average Average Average Average Average, Average Average lAverage I SUMoISM i, _4 7 I5 -79Z -T1517 7137U uTl9U 7.97 2Satiroton Temp. NfA F46.32 WtA 44-85 W/A 44.80 N/A 44.55 3 Suction Compressor 98.21 83.75 -91.32 6405 90.38 64.10 89.96 64.20 4 Superheat N/A 18.43 N/A 19.20 N/A 19.30 N/A 19.65 Discharge 6 COMP. PSIG 161-04 229.98 151.30 229.83 151.48 228-98 151.60 229.52 6 saturation Temp. N/A 104fl0 NIA 103.90 NIA 103.10 N/A 103.75 7 Discharge Comp. 95.88 145.82 95.10 144.36 94.69 143.80 94.53 143.81 a Liquid OD Coil PSIG 149.20 216.83 150.93 216.90 149.92 216.04 150.15 216.55 9 Saturation Temp. N/A 98.10 N/A 87.810 N/A 97.85 N/A 98.05 Leaving 00 Coil 79.84 97.42 79.89 97.28 70.00 07.09 80-31- 97.18 11 Liquid@, ID Coil PSIG 150.75 214.96 151.00 215.32 151.22 214.62 1A6 215.24 12 Saturation Temp. NIA 97.65 N/A 97.70 N/A 97.55 NIA 97.7 13 Liquid ID Coil 79.76 96.38 79,76 96.28 79.09 96.11 79.98 96.18 14 Subcool N/A 1.01 N/A 1.42 N/A 1.44 N/A 1.52 Vapor Q ID Coil PSIG 149.68 82.26 149.89 81.38 150.09 81.31 150.36 80.85 15.1 Saturation Temp. N/A 46.60 N/A 46,10 N/A 46.10 N/A 45. 17 Leaving ID Coil 77.21 61.89 77.42 51.87 77.67 61.63 77.67 61.89 IS Compressor DoMe 105.67 96.91 100.55 93.90 99.18 93.0 98.63 92.80 19 Compressor Sump 109.65 102,67 104.36 19.4 102.8B 98.90 102.29 88.54 Inlet Grid $0.13, 79.89 80.10 70.89 80.11 79.87 80.09 79.85 20.1 Discharge Grid 72,50 6.4.17 72.87 83.99 73.17 63.96 73.38 63.7 21 Tunnel GrId 89.00. 67.29 71.40 67.71 71.89D 67.80 72.0 67.97 Indoor Dry Bulb 80.05 78.85 80.03 79.89 B0.03 79,88 80.03 79.8 28 Indoor Wet Bulb 59.24 59.08 69.27 58.80 59.41 58.91 59.653 59.35 27 17102.30OD Dry Bulb 81.89 82.38 81.90 92.38 81.91 82.32 81.92 82.33 28 E102.4 01) Wet Bull) 50.48 60.75 60.49 130.45 W0.65 60.49 61.02 61.92 29 Discharge Dry Bulb 68.20 70.39 89.84 70.99 70.21 71.08 70.44 71.34 Discharge Wet Bulb. 55.51 5.60 55.99 55.49 '6.04 55.51 58.00 55.81 31 Blower Watts 0.00 0.35 0.00 0.35 0.00 0.35 0.00 0.35 32 Volteig it at N/A0 20.7 N/A0 20.94 N/A0 20.7 N/A 20.35 34 Voltage A to C N/A 208.17 N/A 208.4 N/A 208.12 N/A 208,35 34 Voltage 82toNC NIA 118.14 N/A 118.47 N/A 11208 W/A 118.825 36 Voltage L2 Io N NIA 121 .39 N/A 11.5 NIA 122.02 N/A 122.42 37 VaPS L3t2 N/A 19,31 N/A 92.9 N/A 12.2 N/A 92.3 38 AMPS 2 N/A 9.37 N/A 9,33 N/A 9.35 N/A 9.35 39 kAPS 3OA N/A 192 N/A 1.93 N/A 1.92 N/A 1.92 FREQ. OTA N/A 60.00 N/A 5,99 N/A 1.0 N/A 6.00 40- -REQ -I -IW 99 0 1NA

Claims

1. A refrigerant composition comprising a mixture of, by weight, about 20% to HFC 32; about 20% to 28% HFC 125; 48% to 54% HFC 134a and about 0.08% to 1% by weight of a lower alkyl alcohol, formulated into a composition compatible with a refrigerating device.

2. A refrigerant composition as defined in claim icomprising from about 22% to (N 24% by weight of HFC 32; about 24% to 26% by weight of HFC 125; about o 49.0% to 53.3% by weight of HFC 134a; and about 0.6% to 0.8% by weight 0 of a lower alkyl alcohol.

3. A composition as defined in claim wherein said lower alkcyl alcohol is anhydrous.

4. A refrigerant composition as defined in claim 1, wherein said lower alkyl alcohol comprises methanol or ethanol.

A refrigerant composition as defined in claim 1, wherein lower alkyl alcohol comprises anhydrous ethanol.

6. A refrigerant composition as defined in claim 1, further comprising a lower alkyl hydrocabon present in an amount up to 4.0% by weight.

7. A refrigerant composition as defined in claim 6, wherein said lower alkyl is a straight or branched chain C 1 -C 6 alkyl.

8. A refrigerant composition as defined in claim 7, wherein said hydrocarbon based refrigerant is selected fmom isobutane and propane.

9. A composition as defined in claim 8, wherein said alkyl is propane. COMS ID No: SBMI-07237244 Received by IP Australia: lime 17:25 Date 2007-05-03 16/05 '06 TUE 15:44 FAX 61 8 82119433 Lesicar Perrln @009 I\O 13 O O

10. A refrigerant composition as defined in claim 1, comprising from about 20 26% by weight of HFC 32; about 22 28% by weight of HFC 125; about 48- 54% by weight of HFC 134a; and about 0.2-1.5% by weight of said lower alkyl alcohol

11, A composition as defined in claim 10, comprising about 23% by weight HFC 32; about 25% by weight HFC 125; about 51.3% by weight HFC 134a and Sabout 0.7% by weight of lower alkyl alcohol. cn

12. A composition as defined in claim 11, wherein lower alkyl alcohol is selected O o from ethanol and methanol.

13. A refrigerant as defined in claim 12, wherein said lower alkyl alcohol is ethanol.

14. A refrigerant composition comprising by weight about 20 to 25% HFC 32; about 22 to 28% HFC 125; 48 to 54% HFC 134a; about 0.6% to 1% lower alkyl alcohol and up to about 4% of a lower alkyl hydrocarbon compound.

A composition as defined in claim 14, wherein said lower alkyl alcohol comprises a C, to C 4 straight or branched chain alkyl alcohol.

16. A composition as defined in claim 15, wherein said lower alkyl alcohol is selected from methanol and ethanol.

17. A composition as defined in claim 14, wherein said lower alkyl hydrocarbon is selected from isobutane and propane.

18. A composition as defined in claim 14, wherein said lower alkyl alcohol is anhydrous.

19. A refrigerant composition substantially as hereinbefore described. COMS ID No: SBMI-03606382 Received by IP Australia: Time 16:12 Date 2006-05-16