Development of New Social System Utilizing Natural Energy

1. 为了探讨利用冷河水在夏季进行冷却的可行性，以金泽南部地区的长坂明渠为例进行了研究。(1)在3天内对5个点进行了2次水温和流量测量，分布在3 km范围内。结果表明，上游的水温保持在20<正负>1 C，而大气温度在28 C上下波动。建立了基于传热理论的数学模型来解释水的测量温度。(2)以某一特定场所为例，具体估算冷却成本。本研究假设采用风机盘管冷却器（FCU）。散热器盘管里抽上来的水用电风扇冷却。研究发现，用FCU制冷每小时的成本比普通电制冷每小时低15日元。利用热管提取内川坝湖冬季相当于8oc水的热量，用于3个月的融雪。通过数学分析验证了融雪的发生。1996年冬季在污水控制中心测量了污水和处理过的水的温度。冬季水温与大气温差为10‰，该值足以使积雪融化。1995年夏天，在一个棒球场上洒上处理过的污水，以评价洒水的降温效果。结果表明，大气温度下降约4ºC。

1. To investigate the feasibility of cooling at summer by cold river water, a case study was made concerning Nagasaka open channel, which flows down irrigating the southern district of Kanazawa. (1) The water temperature and flow were measured twice during 3 days at 5 points scattered in the distance of 3 km. It was disclosed that the water temperature at the upper stream was kept at 20<plus-minus>1ﾟC, whereas the atmospheric temperature fluctuated around 28ﾟC.A mathematical model based on heat transfer theory was constructed to explain the measured temperature of water. (2) As a case study, a specificplace was chosen to concretely estimate costs for cooling. A fan-coil unit cooler (FCU) was assumed in present study. The pumped-up water in radiator coil was cool-ed with an electrical fan. It was found that cooling by FCU costs 15 yen less per an hour than by an ordinary electrical coole2. The heat equivalent to 8ﾟC water at Uchikawa dam lake in winter was extracted with a heat pipe and used for snow melting for 3 months. The occurrence of snow melting was verified through mathematical analysis.3. Temperatures of sewage and treated water were measured in winter of 1996 at a sewage control center. The difference between the water and atmospheric temperatures in winter was 10ﾟC, which value is sufficient for snow melting.4. To evaluate the cooling effect of sprinkling grounds with water, a baseball ground was sprinkled with the treated sewage water in summer of 1995. It was found that the drop in atmospheric temperature was about 4ﾟC.