The performance of a patented water pumping model with steam-air power was presented, which operates automatically by direct contact cooling method. The main objective was to study feasibility of a pumping model for u...The performance of a patented water pumping model with steam-air power was presented, which operates automatically by direct contact cooling method. The main objective was to study feasibility of a pumping model for underground water. In this model, a heater installed within the heat tank represented sources of waste heat as energy input for finding appropriate conditions of the 10 L pump model. The system operation had five stages： heating, pumping, vapor flow, cooling, and water suction. The overall water heads of 3, 4.5, 6 and 7.5 m were tested. At the same time, it was found that the pump with 50% air volume is sufficient for pumping water to a desired level. In the experiment, the temperatures in the heating and pumping stages were 100-103 ℃and 80-90 ℃, respectively. The pressure in the pumping stage was 12-18 kPa, and the pressure in the suction stage was about-80 kPa, sufficient for the best performance. It could pump 170 L of water at a 2 m suction head, 120 L at a 3.5 m suction head, 100 L at a 5 m suction head, and 65 L at a 6.5 m suction head in 2 h. A mathematical model for larger pumps was also presented, which operates nearly the same as the present system. Economic analysis of the 10 L pump was also included.展开更多
对分布在不同热工区属的中国36个城市中配置二次侧集中循环直接接触冷板式液冷辅助精密空调风冷散热系统的样本数据中心进行节能分析。建立了能耗计算模型,计算出不同城市的制冷散热系统的年部分电能使用效率(partial power usage effec...对分布在不同热工区属的中国36个城市中配置二次侧集中循环直接接触冷板式液冷辅助精密空调风冷散热系统的样本数据中心进行节能分析。建立了能耗计算模型,计算出不同城市的制冷散热系统的年部分电能使用效率(partial power usage effectiveness,pPUE)值,计算结果显示所有样本城市的pPUE值均低于1.13,系统节能且全国各地都适用。分析发现:pPUE值与系统中极端低温决定的乙二醇溶液浓度基本成本正比,浓度越高pPUE值越高;而同一气象区属城市采用直接接触冷板式液冷后系统的pPUE值降低率则与海拔高度基本成正比关系,海拔越高pPUE值降低率越高,采用液冷的节能效益越发凸显;降低风冷散热比例及提高风冷散热能效可进一步降低该系统pPUE值。展开更多
基金the financial support provided by National Research Council of Thailand and the Energy Technology Division, School of Energy Environment and Materials, King Mongkut’s University of Technology Thonburisupported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission
文摘The performance of a patented water pumping model with steam-air power was presented, which operates automatically by direct contact cooling method. The main objective was to study feasibility of a pumping model for underground water. In this model, a heater installed within the heat tank represented sources of waste heat as energy input for finding appropriate conditions of the 10 L pump model. The system operation had five stages： heating, pumping, vapor flow, cooling, and water suction. The overall water heads of 3, 4.5, 6 and 7.5 m were tested. At the same time, it was found that the pump with 50% air volume is sufficient for pumping water to a desired level. In the experiment, the temperatures in the heating and pumping stages were 100-103 ℃and 80-90 ℃, respectively. The pressure in the pumping stage was 12-18 kPa, and the pressure in the suction stage was about-80 kPa, sufficient for the best performance. It could pump 170 L of water at a 2 m suction head, 120 L at a 3.5 m suction head, 100 L at a 5 m suction head, and 65 L at a 6.5 m suction head in 2 h. A mathematical model for larger pumps was also presented, which operates nearly the same as the present system. Economic analysis of the 10 L pump was also included.
文摘对分布在不同热工区属的中国36个城市中配置二次侧集中循环直接接触冷板式液冷辅助精密空调风冷散热系统的样本数据中心进行节能分析。建立了能耗计算模型,计算出不同城市的制冷散热系统的年部分电能使用效率(partial power usage effectiveness,pPUE)值,计算结果显示所有样本城市的pPUE值均低于1.13,系统节能且全国各地都适用。分析发现:pPUE值与系统中极端低温决定的乙二醇溶液浓度基本成本正比,浓度越高pPUE值越高;而同一气象区属城市采用直接接触冷板式液冷后系统的pPUE值降低率则与海拔高度基本成正比关系,海拔越高pPUE值降低率越高,采用液冷的节能效益越发凸显;降低风冷散热比例及提高风冷散热能效可进一步降低该系统pPUE值。
