HFO R-1234yf yog lub tub yees ntawm lub neej yav tom ntej. Los yog tsawg kawg, qhov ntawd yog li nws tau ua lag luam. Yf yog thawj HFO tub yees ua kom pom kev kawm lub ntsiab. Ob peb xyoos rov qab muaj lub siab loj heev hauv European Union kom tsis txhob siv HFC R-134a rau kev kho cua txias hauv tsheb. Qhov ntsuas siab tau muaj vim yog qhov tsis tshua muaj neeg thoob ntiaj teb ua kom sov (GWP) uas R-134a muaj. R-134a muaj GWP ntawm ib txhiab plaub puas thiab peb caug leej. Nws tau muab cais ua super kev ua qias tuaj.
Cov lus teb rau cov teeb meem hauv ntiaj teb tau los nrog tshaj tawm ntawm HFO tub yees tshiab hu ua R-1234yf. Yf tub yees muaj lub ntiaj teb sov ua kom muaj peev xwm ntawm plaub nkaus xwb. Ntawd yog qhov sib txawv loj heev thaum muab piv rau lwm tus tub yees txias ntawm khw hnub no. Tib qho kev nqes qis rau yf yog tias nws raug ntsuas raws li cov nplaim taws lossis 2L los ntawm ASHRAE thiab lwm lub koom haum huab cua.
Lub Koom Haum Pabcuam European tau maj rawm thiab tawm R-134a thiab muaj lawv cov tsheb tshiab pib noj R-1234yf. Thaum qhov kev lees txais ntawm yf tau qeeb qeeb ntawm no hauv Tebchaws Meskas muaj ntau lub tuam txhab tsim tsheb uas tau pib siv cov tub yees no hauv lawv cov qauv tsheb tshiab. Nrog rau txhua xyoo uas dhau los ntau thiab ntau lub tsheb pib yf.
1234yf Lub Siab Cov Ntawv Cim
Ib qho ntawm thawj kauj ruam thaum nws los mus ntsuas lub tsheb huab cua lub tshuab ua kom txias yog nkag siab txog qhov ntsuas kub thiab siab tam sim no uas koj lub kaw lus ua haujlwm ntawm. Muaj cov lus tseeb nrog rautaw tes saturation, tussubcool, thiab covsuperheatcov lej rau lub tub yees koj ua haujlwm ntawm yog qhov tseem ceeb thaum nws los txog tiag tiag to taub dab tsi ua tsis ncaj ncees lawm nrog koj qhov system.
Daim duab hauv qab no qhia meej txog qhov pressures thiab qhov chaw noo, lossis kub taw tes, R-1234yf:
| °F | °C | PSI | KPA |
| -94 | -70 | -9.82 | -67.7 |
| -90.4 | -68 | -9.26 | -63.8 |
| -86.8 | -66 | -8.65 | -59.6 |
| -83.2 | -64 | -7.99 | -55.1 |
| -79.6 | -62 | -7.27 | -50.1 |
| -76 | -60 | -6.49 | -44.7 |
| -72.4 | -58 | -5.65 | -39.0 |
| -68.8 | -56 | -4.73 | -32.6 |
| -65.2 | -54 | -3.75 | -25.9 |
| -61.6 | -52 | -2.69 | -18.5 |
| -58 | -50 | -1.55 | -10.7 |
| -54.4 | -48 | -0.33 | -2.3 |
| -50.8 | -46 | 0.99 | 6.8 |
| -47.2 | -44 | 2.39 | 16.5 |
| -43.6 | -42 | 3.89 | 26.8 |
| -40 | -40 | 5.49 | 37.9 |
| -36.4 | -38 | 7.19 | 49.6 |
| -32.8 | -36 | 9.01 | 62.1 |
| -29.2 | -34 | 10.94 | 75.4 |
| -25.6 | -32 | 12.99 | 89.6 |
| -22 | -30 | 15.17 | 104.6 |
| -18.4 | -28 | 17.47 | 120.5 |
| -14.8 | -26 | 19.91 | 137.3 |
| -11.2 | -24 | 22.49 | 155.1 |
| -7.6 | -22 | 25.21 | 173.8 |
| -4 | -20 | 28.08 | 193.6 |
| -0.4 | -18 | 31.11 | 214.5 |
| 3.2 | -16 | 34.29 | 236.4 |
| 6.8 | -14 | 37.64 | 259.5 |
| 10.4 | -12 | 41.17 | 283.9 |
| 14 | -10 | 44.87 | 309.4 |
| 17.6 | -8 | 48.75 | 336.1 |
| 21.2 | -6 | 52.82 | 364.2 |
| 24.8 | -4 | 57.09 | 393.6 |
| 28.4 | -2 | 61.56 | 424.4 |
| 32 | 0 | 66.23 | 456.6 |
| 35.6 | 2 | 71.11 | 490.3 |
| 39.2 | 4 | 76.21 | 525.4 |
| 42.8 | 6 | 81.54 | 562.2 |
| 46.4 | 8 | 87.09 | 600.5 |
| 50 | 10 | 92.89 | 640.5 |
| 53.6 | 12 | 98.92 | 682.0 |
| 57.2 | 14 | 105.21 | 725.4 |
| 60.8 | 16 | 111.75 | 770.5 |
| 64.4 | 18 | 118.55 | 817.4 |
| 68 | 20 | 125.63 | 866.2 |
| 71.6 | 22 | 132.98 | 916.9 |
| 75.2 | 24 | 140.62 | 969.5 |
| 78.8 | 26 | 148.54 | 1024.1 |
| 82.4 | 28 | 156.77 | 1080.9 |
| 86 | 30 | 165.3 | 1139.7 |
| 89.6 | 32 | 174.15 | 1200.7 |
| 93.2 | 34 | 183.32 | 1263.9 |
| 96.8 | 36 | 192.82 | 1329.4 |
| 100.4 | 38 | 202.65 | 1397.2 |
| 104 | 40 | 212.85 | 1467.5 |
| 107.6 | 42 | 223.39 | 1540.2 |
| 111.2 | 44 | 234.29 | 1615.4 |
| 114.8 | 46 | 245.57 | 1693.1 |
| 118.4 | 48 | 257.24 | 1773.6 |
| 122 | 50 | 269.31 | 1856.8 |
| 125.6 | 52 | 281.76 | 1942.7 |
| 129.2 | 54 | 94.75 | 653.3 |
| 132.8 | 56 | 100.09 | 690.1 |
| 136.4 | 58 | 105.62 | 728.2 |
| 140 | 60 | 111.34 | 767.7 |
| 143.6 | 62 | 117.26 | 808.5 |
| 147.2 | 64 | 123.38 | 850.7 |
| 150.8 | 66 | 129.71 | 894.3 |
| 154.4 | 68 | 136.26 | 939.5 |
| 158 | 70 | 143 | 986.0 |
