The main purpose of this work is the experimental characterization of an innovative low temperature driven, dual lift, air-cooled, water ammonia absorption cycle. A prototype implementing this cycle has been characterized according to a new testing protocol currently under evaluation within the Task 48 – Quality Assurance and Support Measure for Solar Cooling, within the Solar Heating and Cooling programme of the IEA (IEA-SHC). The protocol is dedicated to the performance testing at steady state of heat driven ab-/adsorption chillers. According to the aforementioned procedure, both thermal and electrical COP of the unit are characterized in different conditions standard rating, application rating and full load. The main feature of the unit are: 3.4 kW of cooling capacity (with chilled water at 7-12°C), low temperature driving heat (85–95) °C, air-cooled condenser / absorber, self-adjusting refrigerant flow, COP typical of half-effect machine, very short response time during start-up and shut-down. The unit has been tested at different operating conditions: driving inlet temperatures in the range 85 to 95 °C, air temperatures from 27 to 40 °C and chiller water outlet temperatures between 7 and 10 °C. The measured thermal and electrical COPs with stable operation of the unit in the investigated operating range are between 0.22-0.37 and 3.5-10 respectively. Moreover, a thermodynamic model of the cycle has been developed and implemented in MATLAB. The experimental data collected during the mentioned tests have been used to validate and tune the cycle’s model. The model results are in reasonable agreement with the experimental data. In light of the results of this work, it is concluded that the tested unit could find application in different fields, including solar cooling and micro-trigeneration.
EXPERIMENTAL CHARACTERIZATION OF AN INNOVATIVE LOW TEMPERATURE DRIVEN DUAL LIFT WATER AMMONIA ABSORPTION CYCLE
YAHIA YOUSSEF ABDELAZIM, AHMED;TOPPI, TOMMASO;APRILE, MARCELLO;MELOGRANO, PATRIZIA NORINA;MAURO, ALBERTO;MOTTA, MARIO
2013-01-01
Abstract
The main purpose of this work is the experimental characterization of an innovative low temperature driven, dual lift, air-cooled, water ammonia absorption cycle. A prototype implementing this cycle has been characterized according to a new testing protocol currently under evaluation within the Task 48 – Quality Assurance and Support Measure for Solar Cooling, within the Solar Heating and Cooling programme of the IEA (IEA-SHC). The protocol is dedicated to the performance testing at steady state of heat driven ab-/adsorption chillers. According to the aforementioned procedure, both thermal and electrical COP of the unit are characterized in different conditions standard rating, application rating and full load. The main feature of the unit are: 3.4 kW of cooling capacity (with chilled water at 7-12°C), low temperature driving heat (85–95) °C, air-cooled condenser / absorber, self-adjusting refrigerant flow, COP typical of half-effect machine, very short response time during start-up and shut-down. The unit has been tested at different operating conditions: driving inlet temperatures in the range 85 to 95 °C, air temperatures from 27 to 40 °C and chiller water outlet temperatures between 7 and 10 °C. The measured thermal and electrical COPs with stable operation of the unit in the investigated operating range are between 0.22-0.37 and 3.5-10 respectively. Moreover, a thermodynamic model of the cycle has been developed and implemented in MATLAB. The experimental data collected during the mentioned tests have been used to validate and tune the cycle’s model. The model results are in reasonable agreement with the experimental data. In light of the results of this work, it is concluded that the tested unit could find application in different fields, including solar cooling and micro-trigeneration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
