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首页> 外文会议>Ammonia refrigerating systems, renewal and improvement >The Design of a Test Rig to Measure the Internal Boiling Heat TransferCoefficient and Pressure Drop for Ammonia in a Horizontal Tube and alsoPressure Drop in 1800 Return Bends at Low Heat Fluxes
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The Design of a Test Rig to Measure the Internal Boiling Heat TransferCoefficient and Pressure Drop for Ammonia in a Horizontal Tube and alsoPressure Drop in 1800 Return Bends at Low Heat Fluxes

机译：用于测量水平管中氨的内部沸腾传热系数和压降以及在低热通量下1800回弯的压降的测试装置的设计

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摘要

It has been identified in a previous paper (Cotter and Missenden, 2004), that there is a lack ofrnknowledge about the calculation of the internal heat transfer coefficient for ammonia boiling in therntubes of an ammonia air cooler. Zurcher et al (1999) found by measurement that this internal heatrntransfer coefficient ranged from 5 to 58 kW/m2K, for mass fluxes of 20-140 kg/m2s. A wide scatterrnof results existed at the lower heat fluxes and vapour fractions. In ammonia air coolers the internalrnboiling heat transfer coefficients had low heat fluxes of up to 2.5 kW/m2 with mass fluxes rangingrnfrom 19-70 kg/m2s. Test rigs to date have only been capable of measuring accurately the higher heatrnfluxes of 8 kW/m2 and above with low vapour fractions.rnThis paper outlines the design principles and calculated accuracies of an ammonia test rig that isrnbeing built to measure the internal heat transfer coefficient of ammonia boiling in plain horizontalrntubes. It will be capable of measuring low heat fluxes 1.5-2.5 kW/m2 with mass fluxes ranging fromrn15-80 kg/m2s. The test rig has a second test section that is designed for measuring pressure drop inrn1800 return bends. This part of the test rig also allows for flow visualisation of boiling ammonia.
机译：在先前的论文中（Cotter和Missenden，2004）已经确定，对于氨空气冷却器的内管中氨沸腾的内部传热系数的计算缺乏了解。 Zurcher等人（1999年）通过测量发现，对于20-140 kg / m2s的质量通量，此内部传热系数范围为5至58 kW / m2K。在较低的热通量和蒸气分数下存在较大的散射结果。在氨空气冷却器中，内部沸腾的热传递系数具有高达2.5 kW / m2的低热通量，质量通量为19-70 kg / m2s。迄今为止，试验台只能准确测量8 kW / m2和更高的较高热通量且蒸气含量较低。rn本文概述了用于测量内部传热系数的氨试验台的设计原理和计算精度。在普通水平管中沸腾的氨气它能够测量1.5-2.5 kW / m2的低热通量，质量通量范围为rn15-80 kg / m2s。该试验台具有第二个试验段，用于测量1800折弯处的压降。测试装置的这一部分还允许可视化沸腾氨的流动。

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