Js. Currie et al., THE PERFORMANCE OF NOVEL COMPACT HEAT-EXCHANGERS WITH HIGHLY EXTENDEDSURFACES, Applied thermal engineering, 16(3), 1996, pp. 245-254
The performance of highly extended surface heat exchangers has been ev
aluated in two heat pump applications: as the evaporator in a compress
ion heat pump and as the absorber in an absorption heat transformer. F
ilm heat transfer coefficients based on the equivalent plain tube area
(p.t.a.), ranged from 200 W m(-2) K-1, for gas-liquid contact, to 380
0 W m(-2) K-1, in the evaporation of a liquid stream. Another measure
of the heat transfer characteristics of the exchangers were the 'UA(o)
' values, which were significantly better than the theoretical values
calculated for each operation. The experimental results ranged from 12
W K-1 (gas) to 214 W K-1 (evaporation), while the theoretical values
were 1 W K-1 (gas) and 43 K-1 (evaporation).