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Subcooling Temperature Tsub [C] 2 6 10 14 18 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 00 52 56 60 64 68 Condensing Temperature Tpcond,av e [C] Figure 7: Effect of Condensing and Subcooling Temperatures on 2nd Law Efficiencies 3. Prototype System Development Due to the mobile nature of this application, portability was a design goal. This is why system weight and size were minimized. In an attempt to avoid compromising system performance, the heat transfer components were designed with microchannels and a high efficiency scroll expander was implemented. During tests conducted in the lab, a hot oil circulator was used to simulate the heat source. The combined cycle prototype unit (on the right) and the hot oil circulator (on the left) are shown in Fig. 8. The view is from the front side of the prototype unit, where the evaporator panel was situated. The louver panel in front of the brazed aluminum microchannel (BAM) evaporator protects the air fins and directs the flow. Two impellers were used behind the evaporator to draw air from the center of the front surface; and blow the cooled air out to the room through both the top and bottom slots. As also can be seen from the picture, there are 4 axial fans sitting on the top of the unit to provide air flow to cool the condensers. They are designed to provide a draw-through system, which means cooling air is pulled through the power and cooling condensers on each side of the unit and exits from the top. One of the primary concerns was hot air recirculation; the current design has the advantage of minimizing the amount of hot air pulled back into the system. A back view of the prototype unit is shown in Fig. 9. The entire volume is filled with components, plumbing, valves, instruments, controls, electrical, and data acquisition elements. Once the system is properly configured, the only external connections are a 110 VAC power cord, a USB cable connected to a laptop used for data acquisition and controls, and the white insulated lines connecting the boiler and the hot oil circulator. Tpcond,ave vs. ηp,II Tpcond,ave vs. ηc,II Tsub vs. ηp,II Tsub vs. ηc,II 14 Power Cycle 2nd Law Efficiency ηp,II Cooling Cycle 2nd Law Efficiency ηc,IIPDF Image | Performance of a Combined Organic Rankine Cycle
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