HOT WATER SUPPLY SYSTEM AND OPERATION CONTROL METHOD OF THE SAME

• Main Authors: IDA KOJI, MIYAMURA HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 12.05.2016
• Subjects: BLASTING; FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL; HEATING; LIGHTING; MECHANICAL ENGINEERING; RANGES; VENTILATING; WEAPONS

PROBLEM TO BE SOLVED: To suppress temperature drop in a secondary side outlet of a heat exchanger to a minimum even in the case where a winter defrosting operation is necessary, in a hot water supply system in which a heat pump water heater and the heat exchanger are disposed.SOLUTION: A hot water supply system 1 includes: a heat pump water heater 11; a heat exchanger 12; a hot water storage tank 15 for storing hot water supplied from an outlet of a secondary side flow passage 14 of the heat exchanger; temperature sensors 37, 38 for detecting water temperature T3 of a primary side inlet of the heat exchanger 12 and water temperature T4 of a secondary side outlet of the heat exchanger 12 respectively; a circulation pump 17 for supplying cold water to the secondary side flow passage 14 from a lower part water outlet 24 of the hot water storage tank 15; and a control unit 20. In a predetermined period after the completion of a defrosting operation of the heat pump water heater 11, the control unit 20 controls a circulation flow rate supplied to the secondary side flow passage 14 so that the temperature T4 of the secondary side flow passage 14 outlet maintains constant preset temperature without following the temperature T3 of the primary side flow passage 13 inlet.SELECTED DRAWING: Figure 1 【課題】 ヒートポンプ給湯機と熱交換器を配した給湯システムにおいて、冬期のデフロスト運転が必要な場合においても、熱交換器の二次側出口の温度低下を最小限に抑制する。【解決手段】 給湯システム１は、ヒートポンプ給湯機１１、熱交換器１２、熱交換器の二次側流路１４の出口から供給される温水を貯える貯湯タンク１５、熱交換器１２の一次側入口の水温Ｔ３と熱交換器１２の二次側出口の水温Ｔ４を夫々検出する温度センサ３７、３８、貯湯タンク１５の下部出水口２４から冷水を二次側流路１４に供給する循環ポンプ１７、及び、制御部２０を備え、制御部２０が、ヒートポンプ給湯機１１のデフロスト運転が完了後の所定期間において、二次側流路１４出口の温度Ｔ４が一次側流路１３入口の温度Ｔ３に追随せず一定の設定温度を維持するように、二次側流路１４に供給される循環流量を制御する。【選択図】 図１