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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

APPARATUS DESIGN FOR MEASURING FORCED CONVECTION HEAT TRANSFER COEFFICIENTS OF SUPERCRITICAL H2O/CO2 MIXTURES

Dong Liu
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Hanlin Zhang
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Sha Li
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Longfei Chen
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Qiang Li
MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

DOI: 10.1615/IHTC16.mpf.023692
pages 6801-6806


KEY WORDS: Two-phase/Multiphase flow, Measurement and instrumentation, Supercritical fluid, Mixture, Forced convection

Abstract

The supercritical H2O/CO2 mixture is the working fluid to drive a turbine in a novel power generation system with coal gasified in supercritical water. This system is promising because of zero pollution emission in contrast to the conventional coal-fired power plant. Heat transfer coefficients of the supercritical H2O/CO2 mixtures are important to design heat transfer equipment in the novel system, which is similar to the role of heat transfer to supercritical water in conventional systems. However, heat transfer to supercritical mixtures has received less attention. Here, we designed an apparatus to measure the forced convection heat transfer coefficients of supercritical H2O/CO2 mixtures. De-ionized water and carbon dioxide are separately pressurized to supercritical pressures and then heated to temperatures above the water critical temperature. Then they are mixed and flow into the test section which is electrically heated. The mixture pressures and temperatures, the test section wall temperatures and heat flux are measured to determine the convection heat transfer coefficients. The highest mixture temperature is designed to be 873 K with highest pressure to be 25 MPa. The control of the pressure and the component mass fraction is elaborately designed to avoid pressure oscillations and component variations throughout the apparatus. The measurement uncertainties were analyzed and are expected to be below 15%.

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