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Sewage source heat pump unit operates under partial load most of the time, and study on the law of coefficient of performance (COP) of the unit varying with load ratio can provide basis for the heat pump units running in high efficiency. A mathematical model determining COP, evaporation temperature and condensation temperature of a single unit was proposed. Under the condition of uniform load distribution, the model was established according to different ways of bearing partial load with the same type multiple units but different parallel operation models, and the operation characteristics of units were analyzed as well. Results show that the single screw water-source heat pump can maintain high COP only at 60%—100% load ratio, COP decreases sharply with the decrease of load ratio, and the units with parallel operation are controlled by the load ratio of a single unit according to the reduction of total load which can keep the average COP at high level within a wide load range. 相似文献
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山西车氏形意拳术，传自车毅斋先生。车毅斋（1833～1914年），名永宏，山西省太谷县桃园堡村人氏，师承清末武林之魁、形意拳名家、河北深县李洛能（字飞羽），并兼得戴家秘传。车毅斋先生精研拳理，精炼拳技，形成了其形意拳的独特风格和气魄，博大精深，气势恢弘。先生也因此成为形意拳的一代宗师，无人能敌，故人称“神拳”车毅斋。车先生也因此被清王朝授予武官四品官带，其拳技深奥、神妙莫测，拳势古朴文雅、 相似文献
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“交流互动式”课堂教学模式的研究与实践 总被引：27，自引：0，他引：27
章提出了在课堂教学中采用交流互动式教学模式的理论依据、实施方法及在教学中的应用实践，指出“交互式”课堂教学模式是实现课堂教学要素的全方位有机设置，是落实启发教学、形成师生之间的交流反馈、充分调动学生在教学统一体中的积极性、主动性、创造性的好方法。 相似文献
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