An Experiment on Solar Hot Water Supply System and a Study on the Insulation of Piping, Heat Exchange Efficiency and Usage Patterns

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  • 太陽熱給湯実験と配管の保温性・熱変換効率および負荷パターンに関する考察
  • タイヨウ ネツ キュウトウ ジッケン ト ハイカン ノ ホオンセイ ネツ ヘン

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It is common knowledge that the sun provides the earth with gigantic amounts of energy, but its quantity per unit area is very small. This makes the total efficiency of the system an important matter in the use of solar energy. The total efficiency depends on the product of four efficiencies-heat collection, heat storage and discharge, heat conversion, and heat utilization. No matter how good the partial efficiency of the system, the system has little significance without improved total efficiency. Based on this and supported by the installation of a small pilot solar plant for acquiring experimental data helpful in the design of solar cooling, heating, and hot water supply systems, this study reviews the cause and effect of the insulation of the piping system, the pump flow, the number of heat exchanger transfer units, and the hot water supply usage pattern on tatal efficiency and explains each of the four typical hot water supply usage patterns by a comparison study of these factors with the aid of computer simulation. The conclusion is that to improve the system efficiency the heat collection piping system must be designed with smaller diameter pipes, a typical stratum of temperature in the heat storage tank must be left unagitated, and the hot water usage patterns must approximate those in heat collection

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