Potential for using water reservoirs as heat sources in heat pump systems
Potential for using water reservoirs as heat sources in heat pump systems
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DOI：
10.1016/j.applthermaleng.2014.10.091
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发表时间：
2015-02
影响因子：
6.4
通讯作者：
Sayaka Kindaichi;Daisaku Nishina;Liwei Wen;Taiki Kannaka
中科院分区：
文献类型：
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作者：
Sayaka Kindaichi;Daisaku Nishina;Liwei Wen;Taiki Kannaka
在日本西部，有许多水库用于农业应用或防洪。这些水库可以节省能源，因为它们的水通常在冬季温度较高，夏季温度低于环境空气。目前的工作评估是否储存在这些水库的热能可以用作热泵系统的热源。在6个不同的水库深度，水温测量超过1年。在夏季有热分层，其中水温广泛分布在10 °C和30 °C之间。在冬季，活跃的自然对流提供了一个稳定的垂直温度分布。一维流体动力学模型能够再现测量的水温。在此基础上，根据夏季供冷指标Pc和冬季供暖指标Ph，对16座水库作为热源的潜力进行了评价。这些指数与环境空气温度和水库底部附近计算的水温之间的差异有关。冬季的天气条件被发现在统计上影响PcandPh。夏季气候条件对库底附近水温影响不大。寒冷的冬天会产生很大的Pc值。
There are many water reservoirs intended for agricultural applications or flood control in western Japan. These reservoirs may offer energy savings because their water is usually at a higher temperature in winter and lower temperature in summer than that of ambient air. The present work assesses whether thermal energy stored in these reservoirs can be used as heat sources for heat pump systems. Water temperatures were measured over 1 year at six different reservoir depths. During summer there was thermal stratification, in which water temperatures were widely distributed between 10 °C and 30 °C. During winter, active natural convection provided a stable vertical temperature distribution. A one-dimensional fluid dynamics model enabled reproduction of the measured water temperatures. Then, based on an index for cooling in summer (Pc) and another for heating in winter (Ph), the potential of using 16 reservoirs as heat sources was evaluated. These indices are related to differences between ambient air temperatures and water temperatures calculated near reservoir bottoms. Winter weather conditions were found to statistically affect bothPcandPh. Weather conditions have little influence on water temperatures near reservoir bottoms in summer. Cold winters produce large values ofPc.