Development of Urban-type Geothermal Heat Pump Systems for Minimizing Heat Island Phenomena

为了优化设计和评价地面的热物性，在福冈市和喀喇松市新钻的50m深的实验换热井上进行了现场试验。在热响应试验(TRT)中，使用光纤温度计测量垂直温度分布，并对温度数据进行解释，以开发高精度的垂直导热系数分布估计程序。在福冈市，为收集长期运行数据进行了制冷和供热试验。在获得现场施工记录和现场地质资料的基础上，建立了数值模型，并用现场试验数据进行了验证，优化了井的设计和施工策略。为建立地热热泵空调系统…的系统模型，收集了一年来200m2空调系统的运行数据随着TRT和地下水流速测量结果的整合，M值更高。在同一地点进行了地下水位电法勘探，以探索地源热泵系统的最佳选址；为考虑地下水流的平流效应进行地源热泵系统的最佳选址，在日本秋田、千岛和福井平原进行了地下水流实地调查。在不同地质环境和海拔的几个地点采集了地下水样品，以分析水质和稳定的氧、氢同位素比值。还使用热敏电阻温度计以高分辨率测量了地面温度的分布。在此基础上，编制了地下水环境图，对野外尺度地下水流系统进行了研究。然后利用数值模拟软件FEFLOW建立了地下水流动系统的全场数值模型，以估算各平原的地下水速度、方向和温度的分布。利用该数值模型，绘制了地源热泵系统的适宜性图，为今后地源热泵系统的最佳安装选址提供了依据。秋田市兴奈镇开发了采石场墙体冷却的冷藏系统。在绿色凝灰岩地下采石场的一个矩形空间里，钻了水平孔和观测孔。水平孔与水管串联，用热泵对墙体进行冷却，展示了蓄热系统的节能效果。通过对气温、墙面温度、墙体内温度等的监测，证明冬季利用冷热可以建立0~2℃的降温空间。较少

For the optimum design and the evaluation of thermophysical properties of ground, field tests were carried out at experimental heat exchange wells of.50m deep which were newly-drilled in Fukuoka City and Karatsu City. In thermal response tests (TRTs), vertical temperature profiles were measured using optical fiber thermometers and the temperature data were interpreted to develop an estimation procedure of the vertical thermal conductivity distributions with high accuracy. In Fukuoka City, cooling and heating tests were carried out for the collection of long-term operation data. On the basis of the obtained operation record and the geological information at the test site, a numerical model was constructed and validated with field test data for the optimization of well design and operation strategy. In Karatsu City, operation data of an air-conditioning system of 200m2 floor space were collected for one year to develop a system model of a Geothermal Heat Pump (GHP) air-conditioning syste … More m with the integration of the results of TRT and groundwater velocity measurements. At the same location, electrical prospecting of groundwater level was conducted for the exploration of optimum location of GHP systems.For the optimum site selection of GHP systems with the consideration to the advection effect of groundwater flow, field surveys of groundwater flow were carried out in Akita, Chikushi and Fukui Plain, Japan. Groundwater samples were collected at several locations of different geological settings and elevations for the analysis of water qualities and the stable isotope ratio of oxygen and hydrogen. Profiles of ground temperature were also measured with high resolution using a thermister thermometer. On the basis of the above data, groundwater environment maps were developed to investigate the field-scale groundwater flow system. Field-wide numerical models of groundwater flow system were then developed using numerical simulation software, FEFLOW, for estimating the distribution of groundwater velocity, direction and temperature in each plain. Using the numerical model, suitability maps of GHP system were developed for the optimum site selection of future installation of GHP system.Cold heat storage system with the cooling of quarry walls was developed in Hinai Town, Akita. In a rectangular space in a underground quarry of green tuff, horizontal holes and observation holes were drilled. The horizontal holes were connected in series with water pipes to cool the walls with heat pump and to demonstrate the energy saving efficiency of the heat storage system. Air temperatures and those of surface and inside of the walls, etc. were monitored to demonstrate that a cooling space of 0-2℃ could be established with the use of cold heat in winter. Less