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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >CFD SOLUTION AND EXPERIMENTAL TESTING OF BUOYANCY-DRIVEN CONVECTION CAUSED BY CONDENSERS IMMERSED IN A WATER TANK OF HPWH
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CFD SOLUTION AND EXPERIMENTAL TESTING OF BUOYANCY-DRIVEN CONVECTION CAUSED BY CONDENSERS IMMERSED IN A WATER TANK OF HPWH

机译：HPWH储水池中冷凝器引起的浮力驱动对流的CFD解决方案和实验测试

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摘要

Heat pump water heaters can cut electricity consumption, comparing with the conventional electric resistant water heating tanks by half. A conventional heat pump water heater (HPWH) requires a water circulating pump to sample water temperature every 15 minutes in the tank and to draw water to a condenser-water heat exchanger outside the tank, if water temperature is below the set point. The pump would be on at least once every 15 minutes, 24 hours a day. The novel design presented in this study was to insert the condenser coil through the opening on the top of the water tank. This design eliminated the need of the water circulating pumps, and thus greatly improved the reliability of the HPWH systems. Two types of condenser coil designs were considered; one was a bayonet tube (tube-in-tube) and one was the "U" tube. Previous test data indicated that "U" tube design performed better than the bayonet tube condenser coil, and thus only "U" tube condenser coil was considered in the study. With straight "U" tubes inserted into the tank, it was found that the convective heat transfer was not strong enough to break water temperature stratification in the tank, which resulted in a temperature differential of 16℃ (30℉) from top to bottom. However, when the coil was built in "L" shape, the water stratification disappeared. A computational fluid dynamics code, CFD, was used to study the straight and L shaped condenser coils. Results from CFD simulation were compared with the experimental data and found they were close to each other.
机译：与传统的电阻热水箱相比，热泵热水器可以减少电力消耗。传统的热泵热水器（HPWH）需要水循环泵每15分钟采样一次水箱中的水温，如果水温低于设定点，则将水抽到水箱外的冷凝器水热交换器中。泵每天24小时每15分钟至少打开一次。本研究中提出的新颖设计是将冷凝器盘管插入水箱顶部的开口。这种设计消除了对水循环泵的需求，从而大大提高了HPWH系统的可靠性。考虑了两种类型的冷凝器盘管设计；一个是刺刀管（套管），另一个是“ U”管。先前的测试数据表明，“ U”形管冷凝器盘管的性能优于卡口式冷凝器盘管，因此在研究中仅考虑了“ U”形管的冷凝器盘管。在将直的“ U”形管插入水箱中时，发现对流传热的强度不足以破坏水箱中的水温分层，从而导致上下温度差为16℃（30℉）。但是，当将线圈制成“ L”形时，水的分层消失了。计算流体动力学代码CFD用于研究直线形和L型冷凝器盘管。将CFD模拟的结果与实验数据进行比较，发现它们彼此接近。

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