A Long Term Measurement and Annual Simulation on Domestic Hot Water Supply System

本研究的目的是对热水供应的能耗进行长期测量和年度数值模拟。（1）长期测量结果的整理：从？通过建立判别浴缸热水压力、浴缸水再加热和自动保温的计算方法，在2002年10月至2003年9月的一年中，约20%的热水供应消耗的能量用于再加热和自动保温，这与过去的研究结果大致相当。根据测量结果，分析了浴缸、淋浴龙头、厨房和洗手间的每次使用的热水温度。季节性差异明显，有必要进一步分析。在对再热和自动保温的消耗能量预测方法的研究中，发现其很大程度上依赖于热水供应系统的热源效率，并且发现需要与热水供应时间相同的计算模型。（2）热水供应机建模与验证：采用燃气即时热水供应机最详细的计算模型对所调查住宅单元的系统进行建模。虽然需要进行一些调整，但它能够在一个热水供应周期内将误差控制在1%以下。（3）年度模拟：利用2002年10月至2003年9月的管道系统计算模型和测量数据，以及热水供应机计算模型，在相同条件下进行了全年模拟。燃气即热式热水供应机的热水供应系统总效率约为75%。

The aim of this research is a long term measurement and annual numerical simulation on energy consumption for hot water supply.(1)Arrangement of a long-term measurement result : it analyzed from? survey result by establishing the calculating method for distinguishing the hot water tension of a bathtub, and reheat and automatic keeping warm of bathtub water. In one year from October,2002 to September,2003,about 20% of the whole hot-water supply consumption energy was used for reheat and automatic keeping warm, and it was comparable as the past research result in general. From the measurement result, hot-water temperature of each use of a bathtub, a shower faucet, a kitchen, and a washroom was analyzed. A remarkable seasonal difference is seen and it is necessary to continue analysis further. In examination of the method of predicting the consumption energy by reheat and automatic keeping warm, it turned out that it is greatly dependent on the heat source efficiency of a hot-water supply system, and it turned out that the same calculation modeling as the time of hot-water supply is required.(2)Modeling and verification of a hot-water supply machine : the system of the dwelling unit for survey was modeled using the most detailed calculation model for the gas instant hot-water supply machine. Although some tuning was required, it was able to hold down to less than about 1% of error by one hot-water supply period.(3)Annual simulation : using the calculation model of a piping system and the measurement data from October, 2002 to September, 2003, and a hot-water supply machine calculation model, the annual simulation was carried out on the same condition. Total efficiency of the hot water supply system was about 75% in gas instant supply machine.