1. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 Schematic diagram of a conventional vapor-compression refrigeration system (cycle 1), with a second vapor-compression cycle cascaded to produce subcooled conditions at the evaporator inlet Figure Legend:

2. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 T-s (temperature-entropy) diagram for cycle 1 (conventional vapor-compression cycle cascaded with a second vapor-compression cycle) Figure Legend:

3. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 Schematic diagram of a vapor-compression refrigeration system with economizer (cycle 2) Figure Legend:

4. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 T-s (temperature-entropy) diagram for cycle 2 (conventional vapor-compression cycle with an economizer heat exchanger) Figure Legend:

5. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 Schematic diagram of a pumped-loop system cooled by a thermoelectric cooler (cycle 3) Figure Legend:

6. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 T-s (temperature-entropy) diagram for cycle 3 (pumped loop with thermoelectric cooler) Figure Legend:

7. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 Schematic diagram of a two-loop system (cycle 4) Figure Legend:

8. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 T-s (temperature-entropy) diagram for cycle 4 (two-loop system) Figure Legend:

9. Date of download: 9/18/2016 Copyright © ASME. All rights reserved. From: Energy Efficiency of Refrigeration Systems for High-Heat-Flux Microelectronics J. Thermal Sci. Eng. Appl. 2010;2(3):031004-031004-6. doi:10.1115/1.4003041 Comparison of the single-loop (case 1) and two-loop (case 4) configurations based on COP for two different evaporator temperatures (Tcond=40°C) Figure Legend: