Convegni ATI - Accesso riservato soci CTI

Autore: M. Venegas, G. Gutierrez, J. Roa, E. Palacios, P. Rodriguez

Collana: CA - 61 - Perugia 2006

Note:
In the present paper an experimental study has been conducted to characterize the performance of main components of a single stage absorption machine test rig. The test rig is a LiBr-H2O absorption machine condensed by water and fed by a thermal fluid
at low temperature (below 100 ºC, simulating a solar thermal energy source). Main components include generator, evaporators, absorber, condenser, subcooler and heat recover.
Experimental procedure consists on periods of start-up, normal steady state operation and shut down of the machine. Start-up begins with the thermal fluid heating from ambient temperature to nominal conditions. After about 15 minutes vapour separation begins in the generator. Cold water production begins 10 minutes later. After shut down of the heating source the machine remains producing cold water during about 1 hour. Data of temperature, pressure, concentration and mass fluxes in all components are recorded in intervals of 0.5 seconds.
Average values of the machine operating parameters were obtained in stationary conditions. Results include the cooling power, COP and solution concentration changes as a function of the solution mass flux crossing the generator. Also empirical
correlations for local heat transfer coefficients in the generator, subcooler and heat recover were obtained and global heat transfer coefficients were compared with experimental values.