The objective of this work is to evaluate the accuracy in simulating the performance of a novel concept of solar absorption system. The novel system consists in the direct coupling of a medium temperature (e.g., Fresnel) collector and a water-ammonia single effect air-cooled absorption chiller. Moreover a cold storage in included in the scheme. Several aspects may influence accuracy of simulations for this type of system: absorption chiller non-linear behavior and transient state operation, thermal capacity of the hydraulic circuit and related components (including collector steel), difficulties in the definition of the efficiency (both optical and thermal) for newly developed collectors, effect’s of control strategy and actual control operation, fluctuation of direct radiation. The work has focused on the comparison of two different simulation approaches, respectively based on static and dynamic models. The static model makes use of static single-node collector and a performance map chiller model. The dynamic model makes use of dynamic multi-node collector model and a dynamic black-box chiller model. In both the systems has been used a storage model…. Moreover the simulation results have been compared with experimental data collected at a demonstration site located in Zingonia (BG), Italy. Several thermodynamic variables were monitored at the demonstration site and comparison between model outcomes and experimental data was made in terms of both temperature and power.
Simulations of a novel solar absorption cooling concept a comparison of static and dynamic system models
APRILE, MARCELLO;MOTTA, MARIO
2007-01-01
Abstract
The objective of this work is to evaluate the accuracy in simulating the performance of a novel concept of solar absorption system. The novel system consists in the direct coupling of a medium temperature (e.g., Fresnel) collector and a water-ammonia single effect air-cooled absorption chiller. Moreover a cold storage in included in the scheme. Several aspects may influence accuracy of simulations for this type of system: absorption chiller non-linear behavior and transient state operation, thermal capacity of the hydraulic circuit and related components (including collector steel), difficulties in the definition of the efficiency (both optical and thermal) for newly developed collectors, effect’s of control strategy and actual control operation, fluctuation of direct radiation. The work has focused on the comparison of two different simulation approaches, respectively based on static and dynamic models. The static model makes use of static single-node collector and a performance map chiller model. The dynamic model makes use of dynamic multi-node collector model and a dynamic black-box chiller model. In both the systems has been used a storage model…. Moreover the simulation results have been compared with experimental data collected at a demonstration site located in Zingonia (BG), Italy. Several thermodynamic variables were monitored at the demonstration site and comparison between model outcomes and experimental data was made in terms of both temperature and power.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.