Absorption of water vapour in the falling film of water–lithium bromide inside a vertical tube at air-cooling thermal conditions

Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure

“…Fig. 8 presents variations of the absorption rate as a function of pressure potential for the present study as well as two membrane-based [14,15], a vertical tube [7], three horizontal tube [2,4,5] and a vertical wall [1] absorber configurations. The solution water vapor pressure used in the calculation (P s,w ) is the average of the solution water vapor pressure (calculated using the corresponding solution temperature and concentration [15]) at the absorber inlet and exit.…”

Innovative Systems for Storage of Thermal Solar Energy in Buildings

“…According to studies on absorption falling film heat exchangers operating with LiBr aqueous solution, this yields two different flow regimes: the smooth laminar flow and the wavy laminar flow. Indeed, the smooth-wavy transition occurs between Re ¼ 20 and 30 (Morioka and Kiyota, 1991;Kim et al, 1995;Medrano et al, 2002). The significant UA increase can then be explained by the change in the flow pattern.…”

Experimental evaluation of a direct air-cooled lithium bromide–water absorption prototype for solar air conditioning

“…Some of them investigated new salt mixtures that do not crystallize in such working conditions, for instance [10], [11] or [12]. Other reports analyzed new configurations for absorbers, like [13], [14], [15] or [16]. Lastly, use of lower driving temperature is seen as an alternative option to develop air-cooled LiBr-H 2 O absorption chillers.…”

“…The average performance of the absorption prototype (daily or seasonal) is the ratio of total cooling energy production to total heat delivered to generator, as expressed by equation (13).…”