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2509, Page 3 flow around the indoor condenser in addition to blocking the air flow in A/C operation. The components, which include the indoor and outdoor heat exchangers and electric compressor, were taken from a production hybrid mid- size sedan. A cross-counterflow microchannel heat exchanger was chosen for the secondary condenser and electronic expansion valves were used for control exploration. A transparent accumulator was added in order to visualize the charge migration between heat pump and A/C modes as well as any problems with oil separation in heat pump mode. The production vehicle components used had been optimized for A/C operation with R134a and were used as a proof-of-concept for the R134a/R744 blend in heat pump operation. Many improvements could be made in future research to optimize the components for both A/C and heat pump operation with R445A as the refrigerant. R445A is a zeotropic blend which exhibits a temperature glide during evaporation and condensation. Thus, the use of counter flow heat exchangers is beneficial to take advantage of (or compensate for) the temperature glide. Figure 2: System Architecture in A/C Mode Figure 3: System Architecture in Heat Pump Mode 15th International Refrigeration and Air Conditioning Conference at Purdue, July 14-17, 2014PDF Image | Mobile Heat Pump Exploration Using R445A and R744
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