AU2003294544A1 - Refrigerant composition - Google Patents

Description

WO 2004/063307 PCT/CA2003/002016 -1 REFRIGERANT COMPOSITION BACKGROUND OF THE INVENTION 5 FIELD OF THE INVENTION The invention relates to a refrigerant composition for use in a compressor type refrigerating apparatus. Specifically, the invention relates to refrigerants containing HFC compounds in place of environmentally-harmful chlorinated o10 flourocarbons. DESCRIPTION OF THE PRIOR ART Conventional commercially-available refrigerants typically comprise a 15 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 20 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 25 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. 30 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 -2 the temperatures usually found at the warm anu 1.uuI 0um U1 Lu IOL PuMP,, 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 5 (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 ("HFC") refrigerants, thus avoiding the use of environmentally-harmful chlorinated compounds. The prior art io 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 15is 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 20 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. 25 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. 30 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 -3 formulated to work in a single type of device. Su ,m,,,y ItIy~, IIlUY u1v'1U 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 5 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 10 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 15 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 20 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. 25 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. 30 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 WO 2004/063307 PCT/CA2003/002016 -4 weight; HFC 134a in the amount of about 48% to ,o ,y vvu IL, C1,,u a ,,rve 1May, alcohol in the amount of about 0.08% to 1.5% by weight. In one aspect, the invention is a refrigerant composition comprising HFC 32 5 from about 22% to 24% by weight; HFC 125 in the amount of about 24 to 26 by weight and HFC 134a, in the amount of about 49% to 53.3% by weight; and lower alkyl alcohol in the amount of about 0.6% to 0.8% by weight. In one aspect, the refrigerant comprises the following formulation: 10 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. 15 Optionally, an additional component is added to the mixture, namely a lower alkyl hydrocarbon in the amount of between 0% and 4.0% by weight. "Lower alkyl" means a straight or branched chain C 1

-C

6 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 20 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 25 Having generally described the invention, a detailed and specific example is presented which is within the scope of the invention but which is merely illustrative of the invention. 30 Example A refrigerant composition SP22C was formulated, consisting of a mixture of HFC 32 (difluoromethane) at 23% by weight, HFC 125 (pentafluorommethane) at WO 2004/063307 PCT/CA2003/002016 -5 25% by weight, HFC 134a (1, 1, 1, 2 tetrafluoromuii) L U 1.070 uy wVVIyIL, au 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. 5 The order of introducing components into the composition is not of any consequence. Conventional methods were used to formulate, store and use the composition. 10 The mean boiling point (BP) of the above mixture was measured at - 40.1 deg. C @ 1 atm. The critical temperature (CT) of the mixture was determined to be 86.0 deg. C. 15 For purposes of comparison, the corresponding BP of the common refrigerant R22 is - 40.8 deg. C @ 1 atm. In testing, the above composition was found to be miscible in the following 20 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 CFC 25 containing refrigerant. The test was carried out over four cycles, at an ambient temperature of 82 0 F. Tables 2 through 5 show data generated from similar tests carried out on the composition of the above example, (identified as composition SP 22 C) indicating the tested level of performance for the present formulation. 30 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 an indoor dry and wet bulb temperature condition of 80 and 67 respectively and an WO 2004/063307 PCT/CA2003/002016 -6 outdoor dry bulb temperature of 950 (all in Fahrenu,,,LJ. m .cL I <,au, j Ll i respective conditions were 800/570 and 820. - In test C (Table 4) the comparative conditions were 800/570 and 820. In test D (Table 5) the comparative conditions were: 800/570 and 820, The test data of Table 5 (test D) is a "cycle test" to verify s consistency in the test data. That is, the test machine charged with compound SP 22 C is cycled on and off in predetermined intervals to ensure that the data generated in the previous tests is repeatable with little or no deviation, to illustrate that such a unit can cycle independently with little loss of efficiency. 10 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 the claims set out in this specification.

WO 2004/063307 PCT/CA2003/002016 -7 Table 1 Unit: M # HIRA18506D & FZRPO24N06B8 Date: 6/03/02 Voltage: 208 VAC 60 Hz Run: #16 Test D, 80/57-82"* Barometer. 29.09" Hg Charge: R-22, 3.90 lbs Uycle I Uycle 1 Gycle 2 Uycle 2 Gycle 3 ycle J Ly"l1 4.. yce4 off on off on off on off on 0 Location Average Average Average Average Average Average Average Average Units 1 Suction PSIG 145.73 82.00 145.73 80.74 14621 79.08 146.16 8020 PSIG 2 Saturation Temp. NIA 48.79 N/A 48.02 WIA 46.95 NA 47.68 Deg. F 3 Suction @ Compressor 101.05 68.31 95.79 69.31 94.01 69.23 93.46 70.09 Deg. F 4 Superheat NIA 19.52 N/A 2129 WA 22.28 1 WA 22.41 Deg.F 5 Discharge @ Comp. PSIG 148.50 227.31 148.53 226.97 148.9B 226.82 48.80 226.72 PSIG 6 SaturationTemp. NIA 110.28 N/A 110.18 NA 110.13 NIA 110.10 Deg.F 7 Discharge @ Comp. 97.28 159.39 94.83 156.95 94.15 156.90 93.79 155.90 Deg. F 8 Liquid @ OD Coil PSIG 148.03 212.34 148.10 212.82 148.59 213.77 148.40 212.88 PSIG 9 Saturation Temp. WA 105.52 NIA 105.68 WA 105.99 WA 105.70 Deg. F 10 Leaving OD Coil 80.59 94.34 80.56 94.17 80.71 94.29 80.65 94.18 Deg. F 11 Liquid @ lD Coll PSIG 148.68 211.00 148.71 211.30 148.96 212.95 148.59 211.88 PSIG 12 Saturation Temp. N/A 105.08 N/A 105.18 N/A 105.72 WA 105.37 Deg. F 13 Liquid @ ID Coll 79.76 93.45 80.16 93.27 80.31 93.43 80.29 93.29 Deg. F 14 Subcool N/A 11.63 NIA 11.91 N/A 12.29 WA 12.08 Deg. F 15 Vapor @ t) Coil PSIG 147.25 84.72 147.26 83.54 147.73 81.79 147.69 82.88 PSIG 15.1 Saturation Temp. WA 50.44 N/A 49.72 N/A 48.66 MIA 49.32 Deg. F 17 Leaving ItD Co 75.85 63.51 76.49 65.67 76.85 65.72 76.95 66.24 Deg. F 18 Compressor Dome 113.64 102.62 106.13 97.75 103.52 95.99 102.60 95.75 Deg.F 19 CompressorSump 120.09 11121 111.16 105.08 108.28 103.37 107.37 102.64 Deg.F 0 Inlet Grid 80.16 79.92 80.14 79.92 80.13 79.98 .80.14 79.95 Deg. F 20.1 Discharge Grid 71.72 63.24 72.69 63.30 73.00 62.86 73.25 63.36 Deg. F 21 Tunnel Grid 67.95 66.51 70.53 67.11 71.13 67.07 71.29 67.34 Deg. F 25 Indoor Dry Bulb 80.08 79.85 80.05 79.85 80.04 79.86 80.04 79.87 Deg. F 26 Indoor Wet Bulb 59.21 59.09 59.37 59.45 59.67 59.59 60.46 63.31 Deg. F 27 E102.3 0D Dly Bulb 81.90 82.26 81.93 82.33 81.91 82.31 81.93 82.32 Deg. F 28 E102.4 0D Wet Bulb 60.02 6020 60.12 60.40 60.15 60.29 60.20 60.40 Deg. F 29 Discharge Dry Bulb 67.36 69.79 69.37 70.71 69.87 70.93 70.12 71.18 Deg. F 30 Discharge Wet Bulb 55.17 55.48 55.95 56.11 56.27 56.11 56.24 56.30 Deg. F 31 Blower Watts 0.00 0.36 0.00 0.35 0.00 0.35 0.00 0.35 KW 32 Condensing Unit Waits 0.00 1.55 0.00 1.50 0.00 1.57 0.00 1.57 KW 33 Net Air Side-Capacity NIA 209.92 WA 210.08 MIA 210.38 MIA 210.4 Volts 34 Voltage B to C N/A 208.68 NIA 208.77 N/A 209.09 WA 209.19 Volts 35 VoltageL2toN NIA 119.30 NfA 119.35 N/A 119.51 N/A 119.52 Volts 36 Voltage L3 to N N/A 121.88 N/A 122.07 N/A 122.28 N/A 122.33 Volts 37 AMPS 2 N/A 9.28 WA 9.30 WA. 9.29 NIA 9.30 Amps 38 AMPS 3 N/A 9.29 N/A 9.31 N/A 9.31 :N/A 9.33 Amps 39 kWatts TOTAL NWA 1.91 N/A 1.91 WA 1.92 M/A 1.92 IKN 40 FREQ. NA 59.91 W/A 59.93 IWA 59.90 WA 59.94 Hz WO 2004/063307 PCT/CA2003/002016 -8 Mai,,acturer: Protocol Table 2 Unit: M # HIRAO18506D & F2RPO24N06B Date: 5130/02 Voltage: 208 VAC 60 Hz Run: # 1A Test A 80167-95" Barometer: 29.06" Hg Charge: SP-22C, 3.70 lbs SLocatuon -Average units 1 MMuotaon PtSI ' o,1 I" Pair 2 Saturation Temp, 51.15 Deg. F 3 Suction @ Compressor 62.30 Deg. F 4 Superheat 11.16 Deg. F 5 Discharge @ comp. PSIG 272.00 PSIG 6 Saturation Temp. 113.00 Deg. F 7 Discharge @ Comp. 162.08 Deg. F 6 Liquid @ OD Coll PSIG 259.47 PSIG 9 Saturation Temp. 112.00 Deg. F 10 Leaving OD Coil 110.90 Deg. F 11 Liquid @ ID Coil PSIG 258.37 PSIG 12 Saturation Temp. 112,00 Deg. F 13 Liquid @ ID Coil 109,42 Deg. F 14 Subcool 2.62 Deg. F 15 Vapor @ ID Coil PSIG 89.10 PSIG 15.1 Saturation Temp. 61.50 Deg, F 17 Leaving ID Coil 60.90 Deg. F 18 Compressor Dome 102,38 Deg. F 19 Compressor Sump 119.50 Deg. F 20 Tunnel Grid 65.95 Deg. F 22 Discharge Airflow 877.90 SCFM 23 Static 0.10 In Water 24 Condensate from ID Coil 15.46 Oz 25 Indoor Dry Bulb 80.01 Deg. F 26 Indoor Wet Bulb 67.12 Deg. F 27 E1 02.3 OD Dry Bulb 95,01 Deg. F 28 E1 02.4 OD Wet Bulb 67.65 Deg. F 29 Discharge Dry Bulb 64.78 Deg. F 30 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 B to C 207.70 Volts 35 Voltage L2 to N 118.27 Volts 36 Voltage L3 to N 122.04 Volts 37 AMPS 2 9.93 Amps 38 AMPS 3 9.97 Amps 39 kWatts TOTAL 2.04 KW 40 FREQ. 59.98 Hz 41 Gross Air Side Capacity 18310.8 Btu I H 42 Net Air Side Capacity 17150.4 Btu I H 43 EER 8.41 Btu I/ W*H 44 Cale. Sensible Cap. 14575.07 Btu 45 Sensible + Condensate 16623.52 Btu Condensate Balance 103.1695 % Airl Cond.

WO 2004/063307 PCT/CA2003/002016 -9 Manufacturer: Protocol Table 3 Unit:. M # HIRAD18606D & F2RPG24NOGB Date: 5131102 Voltage: 208 VAC 60 Hz Run: # 2A Test B, 80167-82** Barometer: 29.02" Hg Charge: SP-22C, 3.70 lbs 0 Location . Verag6 us 1 SUCUOn FS12 01.45 I-Sim 2 Saturation Temp. 46.05 Deg. P 3 Suction @ Compressor 66.99 Deg. F 4 Superheat 20.94 Deg. F 5 Discharge @ Comp. PSIG 231.45 PSIG' 6 Saturation Temp. 104 Deg. F 7 Discharge @ Comp. 155.37 Deg. F 8 Liquid @ OD Coll PSIG 217.43 PSIG 9 Saturation Temp. 99.2 Deg. F 10 Leaving OD Coil 98.19 Dog. F 11 Liquid @ ID Coil PSIG 216.30 PSIG 12 Saturation Temp. 99 Deg. F 13 Liquid @ID Coil 97.37 Deg. F 14 Subcool 1.63 Deg. F 15 Vapor @ ID Coil PSIG 84.10 PSIG 15.1 Saturation Temp. 49.5 Deg. 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 65.28 Deg. F 22 Discharge Airflow 875.4 SCFM 23 Static 0.1 In Water 24 Condensate from ID Coil 25.15 Oz 25 Indoor Dry Bulb 80.01 Deg. F 26 Indoor Wet Bulb 67.01 Deg. F 27 El 02.3 OD Dry Bulb 82.01 Deg. F 28 E102.4 OD Wet Bulb 62.96 Deg. F 29 Discharge Dry Bulb 64.24 Deg. F 30 Discharge Wet Bulb 60.53 Deg. F 31 Blower Watts 0.34 KW 32 Condensing Unit Watts 1.57 KW 33 Voltage A to B 208.74 Volts . 34 Voltage B to C 207.74 Volts 35 Voltage L2 to N 123.57 Volts 36 Voltage L3 to N 118.43 Volt 37 AMPS 2 9.32 Amps 38 AMPS 3 9.33 Amps 39 kWatts TOTAL 1.91 KW 40 FREQ. 59.92 Hz 41 Gross Air Side Capacity 20070.1 Btu I H 42 Net Air Side Capacity 18909.6 Btu I H 43 EER 9.9 Btu/W'H 44 Calo. Sensible Cap. 15045.48 Btu 45 Sensible + Condensate 18377.86 Btu Condensate Balance 102.8934 % Air / Cond.

WO 2004/063307 PCT/CA2003/002016 -10 Marufacturer: Protocol Table 4 Unit M # HIRABIBS06D & F2RP024N068 Date: 5/31/02 Voltage: 208 VAC 60 Hz Run: # 3A Test C, 80/167-82 " Barometer: 28.94" Mg Charge: 8P-22C, 3.70 Ibe 0 LO6AIon AV ra ' I Units 1I50bbiti FSIGI /M.U Pslu 2 Saturation Temp. 44.60 Deg. F 3 Suction @ Compressor 62.53 Deg. F 4 Superheat 17,93 Deg. F 5 Discharge @ Comp. PSIG 229.02 PSIG 6 Saturation Temp. 104.00 Deg. F 7 Discharge @ Comp. 153.69 Deg. F 8 Liquid @ OD Coil PSIG 215.79 PSIG 9 Saturation Temp. 98.90 Deg. F 10 Leaving OD Coil 97.54 Deg. F 11 Liquid @ ID Coil PSIG 215.08 PSIG 12 Saturation Temp. 99.80 Deg. F 13 Liquid @ ID Coil 96.93 Deg. F 14 Subcool 2.87 Deg. F 15 Vapor @ ID Coil PSIG 80.95 PSIG 15.1 Saturation Temp. 46.80 Deg. F 17 Leaving ID Coil 59.49 Deg. F 18 Compressor Dome 96.92 Deg, F 19 Compressor Sump 112.34 Deg, F 20 Inlet Grid 80.13 Deg. F 20.1 Discharge Grid 61.54 Deg. F 21 Tunnel Grid 62.72 Deg, F 22 Discharge Airflow 877.70 SCFM 23 Static 0.10 In Water 24 Condensate from ID Coil N/A Oz 25 Indoor Dry Bulb 80.00 Deg. F 26 Indoor Wet Bulb 58.79 Deg. F 27 E102.3 OD Dry Bulb 82.00 Deg. F 28 E102.4 OD Wet Bulb 60.31 Deg. F 29 Discharge Dry Bulb 61.57 Deg. F 30 Discharge Wet Bulb 51.73 Deg. F 31 Blower Watts 0.34 KW 32 Condensing Unit Watts 1,56 KW 33 Voltage A to B 208.31 Volts 34 Voltage B to C 206.51 Volts 35 Voltage L2 to N 118.26 Volts 36 Voltage L3 to N 120.97 Volts 37 AMPS 2 9.23 Amps 38 AMPS 3 9.28 Amps 39 kWatts TOTAL 1.90 KW 40 FREQ. 59.97 Hz 41 Gross Air Side Capacity 18438.1 Btu / H 42 Net Air Side Capacity 17277.7 Btu / H 43 EER 9.09 Btu I H WO 2004/063307 PCT/CA2003/002016 -11 Ma. acturer Protocol Table Unit; M # HIRA018506D & F2RP024N06B Table 5 Date: 5/31102 Voltage: 208 VAC 60 Hz SRun: # 4A Test D, 80/7--82" Barometer: 28.94" Hg Charge: SP-22C, 3.70 Ibs oft On off on off on off on 0 Location Average Average Average Average Average Average Average Average 1DMIoSi 4. fU34V IM79 F144 f. 4. 1MW6.46J -TU47.8 t.S 2 Saturation Temp. N/A 45.32 N/A 44.85 N/A 44.80 N/A 44.55 3 Suction @ Compressor 96.21 63.75 91.32 64.05 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 5 Discharge @ Comp. PSIG 161.04 229.98 151.30 229.83 151.48 22898 151.80 229.52 6 Saturation Temp. N/A 104.00 N/A 103.90 N/A 103.10 NIA 103.75 7 Discharge @ Comp. 95.88 145.82 95.10 144.36 94.69 143.80 94.53 143.81 8 Liquid @ OD Coil PSIG 149.20 216.83 150.93 215.90 149.92 216,04 150.15 216.55 9 Saturation Temp. N/A 98.10 N/A 97.80 N/A 97.85 NIA 98.05 10 Leaving OD Coll 79.84 97.42 79.80 97.28 79.90 97.09 80.31 97.18 11 Liquid @ ID Coil PSIG 150.75 214.95 151.00 215.32 151.22 214,62 151.46 215.24 12 Saturation Tamp. NIA 97.65 N/A 97.70 N/A 97.55 N/A 97.7 13 Liquid @ ID Coil 79.76 96.38 79.75 96.28 79.99 96.11 79.98 96.18 14 Subcool N/A 1.01 N/A 1.42 N/A 1.44 N/A 1.52 15 Vapor @ ID Coil PSIG 149.66 82.26 149.89 81.38 150,09 81.31 150.36 80.88 15.1 Saturation Temp. N/A 46.80 N/A 46.10 N/A 46.10 N/A 45.95 17 Leaving ID Coil 77.21 61.89 77.42 61.87 77.67 61.83 77.67 61-89 18 Compressor Dome 105,67 96.91 100.55 93.90 99.18 93.06 98.63 92.89 19 compressor Sump 109.85 102,87 104.36 99.74 102.88 98.90 102.29 99.54 20 Inlet Grid 80.13 79.89 80.10 79.89 80.11 79.87 80.09 79.85 20.1 Discharge Grid 72.50 84.17 72.87 63.99 73.17 63.96 73.38 63.97 21 Tunnel Grid 69.00. 67.29 71.40 67.71 71.89 67.80 72.06 67.97 25 Indoor Dry Bulb 80.05 79.88 80.03 79.89 B0.03 79.88 80.03 79.88 26 Indoor Wet Bulb 59.24 59,08 59,27 58.80 59.41 58.91 59.53 59.35 27 E102.3 OD Dry Bulb 91.89 82.38 81.90 82.38 81.91 82.32 81.92 82.33 28 E102.4 OD Wet Bulb 60.48 60.76 60.49 60.45 60.65 60.49 61.02 61.92 29 Discharge Dry Bulb 68.20 70,39 69,84 70.99 70.21 71.08 70.44 71.34 30 Discharge Wet Bulb 55.51 55.60 55.99 55.49 56.04 55.51 66.00 55.81 31 Blower Watts 0,00 0.35 0.00 0.35 0.00 0.35 0.00 0.35 32 Condensing Unit Watts 0.00 1.57 0.00 t.5 0.00 1.57 0.00 1.57 33 Voltage A to B N/A 208,47 N/A 208.94 N/A 209.72 N/A 209.35 34 Voltage B to C N/A 207.17 N/A 207.47 N/A 208.16 N/A 208.25 35 Vollage L2 to N N/A 118.44 N/A 118.65 N/A 119.06 N/A 118.82 36Voltage L3to N N/A 121.39 NIA 121,59 N/A 122.02 N/A 122.42 37 AMPS 2 N/A 9,31 N/A 9.29 N/A 9.32 N/A 9.33 38 AMPS 3 N/A 9.37 N/A 9.33 N/A 9.35 N/A 9.35 39 kWatts TOTAL N/A 1.92 N/A 1.91 N/A 1.92 N/A 1.92 40 FREQ. N/A 60,00 N/A 59.97 N/A 60 N/A 60.00

Claims (3)

1. A refrigerant composition comprising a mixture of, by weight, about 20% to 26% HFC 32; about 20% to 28% HFC 125; 48% to 54% HFC 134a and about 0.08% to 1.5% by weight of a lower alkyl alcohol, formulated into a composition compatible with a refrigerating device.

2. A refrigerant composition as defined in claim 1comprising from about 22% to 24% by weight of HFC 32; about 24% to 26% by weight of HFC 125; about

49.0% to 53.3% by weight of HFC 134a; and about 0.6% to 0.8% by weight of a lower alkyl alcohol. 3. A composition as defined in either of claims 1 or 2, wherein said lower alkyl alcohol is anhydrous. 4. A refrigerant composition as defined in any of claims 1 through 3, wherein said lower alkyl alcohol comprises methanol or ethanol. 5. A refrigerant composition as defined in claim 1, wherein lower alkyl alcohol comprises anhydrous ethanol. 6. A refrigerant composition as defined in any of claims 1 through 5, further comprising a lower alkyl hydrocarbon 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 C1-C6 alkyl. 8. A refrigerant composition as defined in claim 7, wherein said lower alkyl is selected from isobutane and propane. 9. A composition as defined in claim 8, wherein said alkyl is propane. WO 2004/063307 PCT/CA2003/002016 -13 10. A refrigerant composition as defined in claim I, uUmpnFriny loU1I UUUL Lu 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 about 0.7% by weight of lower alkyl alcohol. 12. A composition as defined in either of claims 1 or 2, wherein lower alkyl alcohol is selected from ethanol and methanol. 13. A refrigerant as defined in any of claims 10 through 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. 15. A composition as defined in claim 14, wherein said lower alkyl alcohol comprises a C 1 to C4 straight or branched chain alkyl alcohol. 16. A composition as defined in either of claims 14 or 15, wherein said lower alkyl alcohol is selected from methanol and ethanol. 17. A composition as defined in any of claims 14 through 16, wherein said lower alkyl hydrocarbon is selected from isobutane and propane. 18. A composition as defined in any of claims 14 through 17, wherein said lower alkyl alcohol is anhydrous.