[ABSTRAK
Saat ini penggunaan refrigran yang ramah lingkungan menjadi kebutuhanmanusia. Penelitian tentang refrigran pengganti, salah satunya R-290 menjadikebutuhan untuk mengetahui karakteristik didih alir. Penelitian penurunantekanan, dan pertukaran kalor R-290 diharapkan dapat menggantikan posisi R-22sebagai refrigran alami. Dalam percobaan aliran didih R-290 dan R-22 sebagaipembanding dilakukan dalam pipa konvensional berdiameter 7,6 mm. Variasifluks kalor dari 5,9 kW/m2 sampai 25,04 kW/m2, fluks massa dari 282 kg/m2.ssampai 630 kg/m2.s, dan temperature saturasi dari -0,42 oC sampai 11,97 oC untukR-22, sedangkan variasi 9,89 kW/m2 sampai 25,04 kW/m2, fluks massa dari 185kg/m2.s sampai 445 kg/m2.s dan temperature saturasi dari 3,73 oC sampai 9,56 oCuntuk R-290. Hasil yang diperoleh adalah penurunan tekanan dipengaruhi olehfluks massa, fluks kalor dan temperature saturasi, dimana R-22 mempunyaipenurunan tekanan lebih rendah dari R-290. Sedangkan untuk perpindahan kalordipengaruhi oleh fluks kalor dan temperature saturasi, sedangkan fluks massatidak menunjukkan perubahan nilai perpindahan kalor baik untuk R-22 dan R-290. R-290 mempunyai nilai perpindahan kalor lebih besar dari R-22. Persamaanprediksi paling baik untuk penurunan tekanan R-22 oleh Mishima-Habiki (1996) ,sedangkan R-290 oleh Homogenous (1960). Persamaan prediksi paling baik untukperpindahan kalor R-22 oleh Shah (1982), sedangkan R-290 oleh Kwang II Choi(2009) .;
ABSTRACT
To day the use of environmentally friendly refrigran into human needs. Researchon refrigran substitutes, one of which R-290 being the need to know thecharacteristics of flow boiling. Study pressure drop and heat exchange R-290 isexpected to replace the R-22 as a natural refrigran. In the experiment the flowboiling of R-290 and R-22 as the comparison is done in a conventional pipediameter of 7.6 mm. The variation of the heat flux of 5.9 kW/m2 to 25.04 kW/m2,mass fluxes from 282 to 630 kg/m2.s kg/m2.s, and the saturation temperature of -0.42 ° C to 11.97 ° C to R-22, while the variation of 9.89 kW/m2 to 25.04 kW/m2,mass fluxes from 185 to 445 kg/m2.s kg/m2.s and saturation temperature of 3.73 °C to 9.56 ° C to R-290. The result is a pressure drop is influenced by the massflux, heat flux and saturation temperature, where the R-22 has a lower pressuredrop than R-290. As for the heat transfer is affected by the heat flux and saturationtemperature, while the mass flux showed no change in the value of a good heattransfer for R-22 and R-290. R-290 has a value greater heat transfer than R-22.The best prediction equation for the pressure drop of R-22 by Mishima-Habiki(1996), while the R-290 by homogenous (1960). The best prediction equation forthe heat transfer of R-22 by Shah (1982), while the R-290 by Kwang II Choi(2009).;To day the use of environmentally friendly refrigran into human needs. Researchon refrigran substitutes, one of which R-290 being the need to know thecharacteristics of flow boiling. Study pressure drop and heat exchange R-290 isexpected to replace the R-22 as a natural refrigran. In the experiment the flowboiling of R-290 and R-22 as the comparison is done in a conventional pipediameter of 7.6 mm. The variation of the heat flux of 5.9 kW/m2 to 25.04 kW/m2,mass fluxes from 282 to 630 kg/m2.s kg/m2.s, and the saturation temperature of -0.42 ° C to 11.97 ° C to R-22, while the variation of 9.89 kW/m2 to 25.04 kW/m2,mass fluxes from 185 to 445 kg/m2.s kg/m2.s and saturation temperature of 3.73 °C to 9.56 ° C to R-290. The result is a pressure drop is influenced by the massflux, heat flux and saturation temperature, where the R-22 has a lower pressuredrop than R-290. As for the heat transfer is affected by the heat flux and saturationtemperature, while the mass flux showed no change in the value of a good heattransfer for R-22 and R-290. R-290 has a value greater heat transfer than R-22.The best prediction equation for the pressure drop of R-22 by Mishima-Habiki(1996), while the R-290 by homogenous (1960). The best prediction equation forthe heat transfer of R-22 by Shah (1982), while the R-290 by Kwang II Choi(2009)., To day the use of environmentally friendly refrigran into human needs. Researchon refrigran substitutes, one of which R-290 being the need to know thecharacteristics of flow boiling. Study pressure drop and heat exchange R-290 isexpected to replace the R-22 as a natural refrigran. In the experiment the flowboiling of R-290 and R-22 as the comparison is done in a conventional pipediameter of 7.6 mm. The variation of the heat flux of 5.9 kW/m2 to 25.04 kW/m2,mass fluxes from 282 to 630 kg/m2.s kg/m2.s, and the saturation temperature of -0.42 ° C to 11.97 ° C to R-22, while the variation of 9.89 kW/m2 to 25.04 kW/m2,mass fluxes from 185 to 445 kg/m2.s kg/m2.s and saturation temperature of 3.73 °C to 9.56 ° C to R-290. The result is a pressure drop is influenced by the massflux, heat flux and saturation temperature, where the R-22 has a lower pressuredrop than R-290. As for the heat transfer is affected by the heat flux and saturationtemperature, while the mass flux showed no change in the value of a good heattransfer for R-22 and R-290. R-290 has a value greater heat transfer than R-22.The best prediction equation for the pressure drop of R-22 by Mishima-Habiki(1996), while the R-290 by homogenous (1960). The best prediction equation forthe heat transfer of R-22 by Shah (1982), while the R-290 by Kwang II Choi(2009).] |
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