Experimental correlation of combined heat and mass transfer for NH3-H2O falling film absorption

Yong Tae Kang, Atsushi Akisawa, Takao Kashiwagi

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

In this article, experimental analysis was performed for ammonia-water falling film absorption process in a plate heat exchanger with enhanced surfaces such as offset strip fin. This article examined the effects of liquid and vapor flow characteristics, inlet subcooling of the liquid flow and inlet concentration difference on heat and mass transfer performance. The inlet liquid concentration was selected as 5%, 10% and 15% of ammonia by mass while the inlet vapor concentration was varied from 64.7% to 79.7%. It was found that before absorption started, there was a rectification process at the top of the test section by the inlet subcooling effect. Water desorption phenomenon was found near the bottom of the test section. It was found that the lower inlet liquid temperature and the higher inlet vapor temperature, the higher Nusselt and Sherwood numbers are obtained. Nusselt and Sherwood number correlations were developed as functions of falling film Reynolds Re1, vapor Reynolds number Rev, inlet subcooling and inlet concentration difference with ±15% and ±20% error bands, respectively.

Original languageEnglish
Pages (from-to)250-262
Number of pages13
JournalInternational Journal of Refrigeration
Volume22
Issue number4
DOIs
Publication statusPublished - 1999 Jun 1
Externally publishedYes

Fingerprint

mass transfer
Ammonia
heat transfer
vapors
films (materials)
ammonia
Mass transfer
Hot Temperature
Vapors
Heat transfer
Temperature
liquids
Water
Liquids
heat exchangers
desorption
fins
Heat exchangers
Desorption
temperature

ASJC Scopus subject areas

  • Food Science
  • Mechanical Engineering

Cite this

Experimental correlation of combined heat and mass transfer for NH3-H2O falling film absorption. / Kang, Yong Tae; Akisawa, Atsushi; Kashiwagi, Takao.

In: International Journal of Refrigeration, Vol. 22, No. 4, 01.06.1999, p. 250-262.

Research output: Contribution to journalArticle

@article{5e5a0fec951b48dca2110da69a2a20b7,
title = "Experimental correlation of combined heat and mass transfer for NH3-H2O falling film absorption",
abstract = "In this article, experimental analysis was performed for ammonia-water falling film absorption process in a plate heat exchanger with enhanced surfaces such as offset strip fin. This article examined the effects of liquid and vapor flow characteristics, inlet subcooling of the liquid flow and inlet concentration difference on heat and mass transfer performance. The inlet liquid concentration was selected as 5{\%}, 10{\%} and 15{\%} of ammonia by mass while the inlet vapor concentration was varied from 64.7{\%} to 79.7{\%}. It was found that before absorption started, there was a rectification process at the top of the test section by the inlet subcooling effect. Water desorption phenomenon was found near the bottom of the test section. It was found that the lower inlet liquid temperature and the higher inlet vapor temperature, the higher Nusselt and Sherwood numbers are obtained. Nusselt and Sherwood number correlations were developed as functions of falling film Reynolds Re1, vapor Reynolds number Rev, inlet subcooling and inlet concentration difference with ±15{\%} and ±20{\%} error bands, respectively.",
author = "Kang, {Yong Tae} and Atsushi Akisawa and Takao Kashiwagi",
year = "1999",
month = "6",
day = "1",
doi = "10.1016/S0140-7007(98)00076-0",
language = "English",
volume = "22",
pages = "250--262",
journal = "International Journal of Refrigeration",
issn = "0140-7007",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Experimental correlation of combined heat and mass transfer for NH3-H2O falling film absorption

AU - Kang, Yong Tae

AU - Akisawa, Atsushi

AU - Kashiwagi, Takao

PY - 1999/6/1

Y1 - 1999/6/1

N2 - In this article, experimental analysis was performed for ammonia-water falling film absorption process in a plate heat exchanger with enhanced surfaces such as offset strip fin. This article examined the effects of liquid and vapor flow characteristics, inlet subcooling of the liquid flow and inlet concentration difference on heat and mass transfer performance. The inlet liquid concentration was selected as 5%, 10% and 15% of ammonia by mass while the inlet vapor concentration was varied from 64.7% to 79.7%. It was found that before absorption started, there was a rectification process at the top of the test section by the inlet subcooling effect. Water desorption phenomenon was found near the bottom of the test section. It was found that the lower inlet liquid temperature and the higher inlet vapor temperature, the higher Nusselt and Sherwood numbers are obtained. Nusselt and Sherwood number correlations were developed as functions of falling film Reynolds Re1, vapor Reynolds number Rev, inlet subcooling and inlet concentration difference with ±15% and ±20% error bands, respectively.

AB - In this article, experimental analysis was performed for ammonia-water falling film absorption process in a plate heat exchanger with enhanced surfaces such as offset strip fin. This article examined the effects of liquid and vapor flow characteristics, inlet subcooling of the liquid flow and inlet concentration difference on heat and mass transfer performance. The inlet liquid concentration was selected as 5%, 10% and 15% of ammonia by mass while the inlet vapor concentration was varied from 64.7% to 79.7%. It was found that before absorption started, there was a rectification process at the top of the test section by the inlet subcooling effect. Water desorption phenomenon was found near the bottom of the test section. It was found that the lower inlet liquid temperature and the higher inlet vapor temperature, the higher Nusselt and Sherwood numbers are obtained. Nusselt and Sherwood number correlations were developed as functions of falling film Reynolds Re1, vapor Reynolds number Rev, inlet subcooling and inlet concentration difference with ±15% and ±20% error bands, respectively.

UR - http://www.scopus.com/inward/record.url?scp=0032668864&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032668864&partnerID=8YFLogxK

U2 - 10.1016/S0140-7007(98)00076-0

DO - 10.1016/S0140-7007(98)00076-0

M3 - Article

AN - SCOPUS:0032668864

VL - 22

SP - 250

EP - 262

JO - International Journal of Refrigeration

JF - International Journal of Refrigeration

SN - 0140-7007

IS - 4

ER -