(The) effects of surfactant on heat & mass transfer in absorption heat pump = 흡수식 열펌프에서 열 및 물질전달에 대한 계면활성제의 효과

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Recently, the heavy demand on electricity in summer season and environmental problems have made absorption heat pump cycle more attractive for both residential and industrial applications. In order to improve the efficiency of the absorption machine, the low heat and mass transfer in the absorber should be enhanced by the mechanical and physico-chemical ways. This study dealt with the phsyco-chemical method, the enhancement of the heat & mass transfer by surfactant. It is well known that a small amount of surface-active agent (surfactant) can induce the Marangoni convection which is caused by the surface tension gradient with respect to the temperature, absorbent concentration, and surfactant concentration. Many studies on the heat & mass transfer enhancement by surfactant in the literature are concentrated on the well-known working fluids, LiBr + water and water + ammonia. In our laboratory, several LiBr-based solutions were suggested as the potential working fluids for an absorption heat pump. For the application of the new working fluids, the heat and mass transfer characteristics in the absorber should be verified. The overall objective of this work is to supply the experimental information on the enhancement of the heat and mass transfer by surface-active additives and to investigate the characteristics of the heat and mass transfer by developing the proper design equation for the new working fluid-additives pairs. The new working fluids treated in this work are LiBr + 1,3-propanediol + water solution (LiBr/1,3-propanediol = 3.5 by mass) and LiBr + LiI + 1,3-propanediol + water solution (LiBr/LiI = 4 by mole and (LiBr+LiI)/1,3-propanediol = 4 by mass). The additives considered in this study were n-octanol and 2-ethyl-1-hexanol. To attack these subjects, measurements or estimations of the related transport and theromphysical properties were performed. The absorption experiments in the static pool type were performed and also carried out for the preliminary ...
Advisors
Lee, Huenresearcher이흔researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
2001
Identifier
165683/325007 / 000975122
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학공학과, 2001.2, [ xii, 117 p. ]

Keywords

transport property; working fluid; surfactant; absorption heat pump; heat & mass transfer enhancement; 열 및 물질전달 촉진; 전달물성; 작동유체; 계면활성제; 흡수식 열펌프

URI
http://hdl.handle.net/10203/28854
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165683&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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