Measurement of absorption rates in horizontal-tube falling-film ammonia-water absorbers

作者：Lee Sangsoo; Bohra Lalit Kumar; Garimella Srinivas^*; Nagavarapu Ananda Krishna

来源：International Journal of Refrigeration, 2012, 35(3): 613-632.

DOI：10.1016/j.ijrefrig.2011.08.011

• Absorption
• Falling film
• Heat transfer
• Mass transfer
• Ammonia
• Water

Heat and mass transfer in a horizontal-tube falling-film ammonia-water absorber was investigated. A tube bank consisting of four columns of six 9.5 mm nominal OD, 0.292 m long tubes was installed in a shell that allowed heat and mass transfer measurements and optical access for flow visualization. This absorber was installed in a test facility consisting of all the components of a chiller, fabricated to obtain realistic operating conditions at the absorber to account for the influence of the other components in the system. Tests were conducted over desorber solution outlet concentrations of 5-40% for three nominal absorber pressures of 150, 345 and 500 kPa, for solution flow rates of 0.019-0.034 kg s(-1). Measurement and analysis techniques, heat transfer rates, and solution- and vapor-side heat and mass transfer coefficients are described. Trends in heat and mass transfer coefficients are discussed, highlighting the effects of solution flow rate and concentration, and absorber pressure.

• 出版日期2012-5