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effectiveness in the model, the actual effectiveness of the commercially available plate recuperator was typically around 75% including the heat loss. A newly designed integrated boiler and recuperator based on microchannels is planned to replace the plate type boiler and recuperator when it becomes available. It is anticipated higher heat transfer effectiveness (85%) can be achieved with the microchannel devices as well as better insulation. The power output from the expander was consistent with the mass flow rate values recorded during experiments, although both pressure and temperature were lower than the design specification during the tests. This was compensated by the lower condensing pressure and temperature in the power cycle. Essentially the power cycle conversion efficiencies (1st law) at higher pump outlet pressures match the 1st law efficiency in the system model reasonably well. A similar trend occurred in the 2nd law efficiencies which were only slightly below the model results. Since the cooling cycle is sensitive to the operating conditions, running the cooling cycle off its design point has led to reduced cooling capacity. 6. Conclusions The concept of combining an organic Rankine cycle (ORC) with a vapor compression cycle for heat activated cooling was demonstrated in this study. A small scale prototype system based on this concept was developed with guidance from a system model. Highly efficient microchannel heat exchangers along with the use of a scroll expander and compressor were shown to be effective in achieving high system performance at reduced component size and weight. The measured isentropic efficiencies of the scroll expander are especially valuable at its given scale with values ranging from 70% to 84% depending on the imposed pressure ratios. The system performance based on tests conducted in the lab environment shows promise, although the original cooling capacity specification was not attained due to the system operating off the design point. However, this study has shown the combined cycle is viable and can potentially become part of an overall energy solution for heat activated cooling. By recovering waste heat from diesel engines and other power cycles, the system can generate cooling as well as power to improve the overall efficiency and the utilization of fuel. Based on an overall system COP of 0.5, the combined cycle can convert half the amount of waste heat into cooling, which can be significant in many applications. Higher cooling capacity is expected for the system when tested under design conditions and when the full suite of microchannel heat transfer components are integrated into the power cycle. This will further increase the overall COP of the system. Acknowledgement The authors would like to acknowledge the financial support provided by US Army Communications-Electronics Research, Development, and Engineering Center (CERDEC) through the Tactical Energy System program. 25PDF Image | Performance of a Combined Organic Rankine Cycle
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