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Y. Chen, P. Lundqvist, “Theoretical Study of Carbon Dioxide Double Loop System” IIR Internal Refrigeration Congress, Beijing, China, August 21‐26, 2007 In this paper, a carbon dioxide double loop system is proposed. The system consists of two subsystems: a CO2 power subsystem and a CO2 refrigeration subsystem. The power subsystem is able to utilize the energy from the low‐grade heat source to produce power. The power is then transferred to the refrigeration subsystem, partly or totally covering the power consumption of the compressor. Furthermore, it is possible to take advantage of the temperature glides of the heat rejection processes of both subsystems to produce hot water. The influences of different cycle working parameters on the system performance are simulated and analyzed. The results show that the proposed system is a very promising way to provide cooling, heating and hot water more efficiently than traditional systems. Y. Chen, P. Lundqvist, B. Palm, “A Novel Gas‐Water Heat Exchanger with Minichannels”, ASME Summer Heat Transfer Conference, Jacksonville, Florida USA, August 10‐14, 2008 In this study, a novel gas water heat exchanger with minichannels is designed, built and tested. The heat exchanger is mainly composed of a number of concentric ring shaped plates, which are made up of several heat exchanger tubes. The ring‐shaped plates are arranged in parallel and placed in a shell. The heat exchanger is designed as a countercurrent heat exchanger with laminar flow on the heat exchanger’s shell‐side (gas side) and therefore has a very low pressure drop on the shell side. The heat exchanger was tested with water and hot air on its tube‐side and shell‐side respectively. All the necessary parameters like inlet and outlet temperatures on tube‐side and shell‐side as well as the pressure drop, flow rate of fluids, etc. 126PDF Image | Thermodynamic Cycles using Carbon Dioxide
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