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Heat Transfer Performance of a Spiral Heat Exchanger
|關鍵字:||spiral heat exchanger|
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The heat transfer performance of a spiral heat exchanger was numerically and experimentally investigated. In the analysis, a one-dimensional heat transfer model was used. The tube flow is mixed and it flows spirally from the inlet to the outlet. The flow outside the tube is unmixed and it flows radially from the centerline of the spiral tube toward outside. The non-dimensional temperature of the tube flow was evaluated and it yielded the effectiveness and second-law efficiency of the heat exchanger. For a fixed Ntu value, as the ratio of flow heat capacity rates (Ct*) is 1.0, the effectiveness is at the minimum. As the Ct* approaches zero or infinity, the effectiveness would approach the maximum. Conversely, for a fixed Ntu value, as the Ct* value nears 1.0, the second-law efficiency is at the maximum. The effectiveness and second-law efficiency of two heat exchangers in overall-counterflow arrangement appears to be much higher to those of a single heat exchanger. In the experiment, the gas-side (outside the tube) convective heat transfer coefficient (h) and Darcy friction factor (f) of a test model with a five-lap spiral tube was measured. The Reynolds number was in the range 353-2593, The result shows that the f value increases with the (Re-300)^(-0.393).The Nu value increases with the (Re/1000+8)^(3.169).
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