Suscripción a Biblioteca: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Miniaturized Shell-and-Tube Heat and Mass Exchangers for Absorption Heat Pumps

Get access (open in a dialog) DOI: 10.1615/IHTC12.3060
6 pages

Sinopsis

A shell-and-tube heat exchanger with small diameter tubes was experimentally investigated as an absorber for a residential ammonia-water heat pump. This configuration has a high surface/volume ratio, and low thermal resistances compared to conventional geometries. It was demonstrated that an extremely compact absorber (76.2 mm outside diameter, 0.508 m long) with 253 tubes of 2.54 mm inside diameter with the solution flowing vertically downward through the tubes can transfer the absorption duty of a 10.55 kW cooling load absorption heat pump. Experiments over a wide range of solution and coolant flow rates and vapor fractions were used to deduce overall and tube-side absorption heat transfer coefficients. High performance was achieved without any surface enhancement, and with very low solution and coolant pressure drops. This geometry offers considerable versatility to address a wide range of heat load and pressure drop requirements, and can be used for almost all absorption heat pump components (absorbers, desorbers, condensers, and evaporators).