TY - JOUR
T1 - Bundle effect of ammonia/lubricant mixture boiling on a horizontal bundle with enhanced tubing and inlet quality
AU - Chyu, M. C.
AU - Zheng, J.
AU - Ayub, Z.
PY - 2009/12
Y1 - 2009/12
N2 - Shell-side heat transfer coefficients of individual tubes for ammonia/lubricant mixture boiling on a 3 × 5 enhanced tube bundle were measured, enabling a detailed study of tube bundle effect under the influences of inlet quality, concentration of miscible lubricant (co-polymer of polyalkylene glycol, PAG), saturation temperature, and heat flux. Tests were conducted in the range of heat flux from 3.2 to 32.0 kW/m2, simulated inlet quality from 0.0 to 0.4, saturation temperature from -13.2 to +7.2 °C, and lubricant concentration from 0 to 10%. The data show that bundle effect is more significant at a higher saturation temperature. Most of the data in the bottom row are lower than the single-tube heat transfer coefficient data at a low saturation temperature. Lubricant renders the heat transfer coefficient lower in lower rows and higher in higher rows, therefore a larger range of data variation.
AB - Shell-side heat transfer coefficients of individual tubes for ammonia/lubricant mixture boiling on a 3 × 5 enhanced tube bundle were measured, enabling a detailed study of tube bundle effect under the influences of inlet quality, concentration of miscible lubricant (co-polymer of polyalkylene glycol, PAG), saturation temperature, and heat flux. Tests were conducted in the range of heat flux from 3.2 to 32.0 kW/m2, simulated inlet quality from 0.0 to 0.4, saturation temperature from -13.2 to +7.2 °C, and lubricant concentration from 0 to 10%. The data show that bundle effect is more significant at a higher saturation temperature. Most of the data in the bottom row are lower than the single-tube heat transfer coefficient data at a low saturation temperature. Lubricant renders the heat transfer coefficient lower in lower rows and higher in higher rows, therefore a larger range of data variation.
UR - http://www.scopus.com/inward/record.url?scp=70349798686&partnerID=8YFLogxK
U2 - 10.1016/j.ijrefrig.2009.07.013
DO - 10.1016/j.ijrefrig.2009.07.013
M3 - Article
AN - SCOPUS:70349798686
SN - 0140-7007
VL - 32
SP - 1876
EP - 1885
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
IS - 8
ER -