給湯配管部における熱損失の評価を目的として、千葉県の戸建て住宅1軒を対象として給湯配管における熱損失の実測をおこなった。その結果、シャワー1回当たり、使用時の熱損失は245kJ/day程度、使用後における配管部の湯の熱損失は156kJ/day程度であり、浴槽湯張り1回あたりの熱損失は110kJ/day程度、湯張り後の熱損失は113kJ/day程度となった。%In order to the evaluate heat loss from hot water supply lines in a residential building, hot water demand in a house in Chiba prefecture was measured and analyzed. The following results were obtained.rn1. The heat loss of the hot water supply line was about 132kJ for the shower and HOkJ for the bathtub in winter. Since the temperature difference between the inlet and outlet of the hot water supply line is small, the measured heat loss from the hot water supply line sometimes becomes negative.rn2. In order to estimate the heat loss under various conditions, a thermal model was proposed.rn3. The calculated daily heat loss of the hot water supply line was 122kJ for the shower and 689kJ for the bathtub inrnwinter. The average daily heat loss from the hot water supply line during use and after use was 1774.7KJ in winter. This heat loss amounts to 4.7% of the total daily energy use for hot water supply.rn4. For reducing the heat loss, thermal insulation of the hot water supply line and the use of thinner pipes are effective.
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