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study on evacuated tube solar collector using supercritical CO2

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study on evacuated tube solar collector using supercritical CO2 ( study-evacuated-tube-solar-collector-using-supercritical-co2 )

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X.R. Zhang, H. Yamaguchi / Applied Thermal Engineering 28 (2008) 1225–1233 1227 Weather survey system Solar energy Mass flow mater ( ( Temperature and Pressure measure) Temperature measure ) Expansion valve Wind sensor Temperature sensor Atmosphere pressure sensor Weather data Solar insolation sensor Computer Experimental data Pump Heat exchanger 2 Solar CO2 Cold water Flow Pump Hot water Flow mater Heat exchanger 3 Cooling tower Pump Fig. 1. Schematic of the experimental set-up. Heat exchanger 1 Fig. 2. (a) Picture of the CO2-based evacuated solar collector used in the experimental test. (b) Details of the evacuated solar collector used in the test. provided by Showa Denko, but designed to have a maxi- mum allowable work pressure of 12 MPa and have a max- imum working temperature of 250 °C. The details of the used evacuated solar collector can be seen in Refs. [16,17]. A piston pump is used for feeding liquid CO2 in the experiments (the pump is made by YUKEN KOGYO Co. Ltd., XP675-50-10). This canned motor feed pump can provide a maximum operating pressure of 12 MPa

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