Absorption cooling Mechanical Engineering ME462/562 Sustainable - PowerPoint PPT Presentation

ME 562: Sustainable Energy – an Exergy Analysis Spring 2014 Absorption cooling Mechanical Engineering ME462/562 Sustainable Energy: an Exergy Analysis

the Einstein-Szilard refrigerator Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 2/12 an Exergy Analysis

How it works – single effect Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 3/12 an Exergy Analysis

How it works – double effect Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 4/12 an Exergy Analysis

Process schematic Cooling water from cooling Hot water/glycol from tower / swimming pool solar or waste heat source hot water vapor concentrated LiBr solution dilute LiBr solution water cold water vapor Chilled water serving Cooling water from cooling cooling load tower / swimming pool Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 5/12 an Exergy Analysis

Schematic – with temperatures Cooling water from cooling Hot water/glycol from tower / swimming pool solar or waste heat source 80.0 o C 27.0 o C 100.0 o C 100.0 o C 91.5 o C 30.8 o C hot water vapor 80.0 o C 67.6 o C concentrated LiBr solution 40.0 o C dilute LiBr solution water 7.0 o C 40.0 o C 52.0 o C cold water vapor 27.0 o C 16.0 o C 10.0 o C 34.8 o C Chilled water serving 7.0 o C Cooling water from cooling cooling load tower / swimming pool Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 6/12 an Exergy Analysis

Thermodynamic states ? Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 7/12 an Exergy Analysis

Exergy fmows Cooling water from cooling Hot water/glycol from tower / swimming pool solar or waste heat source 0.4953 kW 0.0209 kW 23.695 kW 18.928 kW 0.1745 kW hot water vapor 14.716 kW 11.045 kW concentrated LiBr solution 0.113 kW dilute LiBr solution water 0.113 kW 6.475 kW 10.652 kW cold water vapor 0.2608 kW 0.0209 kW 0.7345 kW 0.4941 kW - 0.8080 kW Chilled water serving Cooling water from cooling cooling load tower / swimming pool Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 8/12 an Exergy Analysis

Exergy destruction Cooling water from cooling Hot water/glycol from tower / swimming pool solar or waste heat source 0.4953 kW 0.0209 kW 23.695 kW Condenser Generator 0.1745 kW 18.928 kW 0.2287 kW 0.6617 kW hot water vapor 14.716 kW 11.045 kW concentrated LiBr solution HX 0.113 kW -0.507 kW dilute LiBr solution ??? water 0.113 kW 6.475 kW 10.652 kW cold water vapor 0.2608 kW 0.0209 kW Evaporator Absorber 0.4473 kW 2.895 kW 0.7345 kW 0.4941 kW - 0.8080 kW Chilled water serving Cooling water from cooling cooling load tower / swimming pool Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 9/12 an Exergy Analysis

A comparable electric chiller Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 10/12 an Exergy Analysis

Performance vs. heat source T Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 11/12 an Exergy Analysis

Performance vs. CHW T Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 12/12 an Exergy Analysis

Performance vs. HX Mechanical Engineering ME462/562 Sustainable Energy: Absorption cooling 13/12 an Exergy Analysis