Steam absorption into films of lithium bromide solution falling over horizontal pipes arranged in a vertical column

✍ Scribed by Masanori Kiyota; Itsuki Morioka; Kohzoh Asahara

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 154 KB
• Volume: 30
• Category: Article
• ISSN: 1099-2871
• DOI: 10.1002/htj.1031

✦ Synopsis

Abstract

Absorber of a water/LiBr absorption chiller is made up of horizontal tube banks, and its improvement is needed to get higher COP. To clarify the absorption process in these tube banks, a single row of horizontal pipe column is studied experimentally and analytically. The analytical model proposed in a previous paper is further changed to a conservative form according to the method of Shyy. It is confirmed that the mass balance of water is kept exactly by the present procedure. As for total absorption rate for the pipe column, the agreement between experiment and numerical calculations is fairly good except for the cases of 8 to 10 pipes at a lower flow rate. The roughed pipes with different knurls on their surface were also tested experimentally and it was found that a knurl height of 0.5 mm was the most effective in absorption enhancement. © 2001 Scripta Technica, Heat Trans Asian Res, 30(6): 451–462, 2001