HOT WATER SUPPLY SYSTEM

• Main Authors: MAGARA TAKASHI, AKAGI NOBUYUKI, ABE MOTOI
• Format: Patent
• Language: English; Japanese
• Published: 01.11.2023
• Subjects: BLASTING; FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL; HEATING; LIGHTING; MECHANICAL ENGINEERING; RANGES; VENTILATING; WEAPONS

To provide a technology capable of reducing a stratification range of an intermediate temperature stratification formed after finishing a tank sterilization operation.SOLUTION: A hot water supply system includes a hot water storage tank, a tank circulation passage, a tank circulation pump, a heat pump, and a controller. When a sterilization execution condition is established, the controller executes a tank sterilization operation in which the hot water is circulated between the hot water storage tank and the heat pump by the tank circulation pump, and the hot water is heated by the heat pump. The tank sterilization operation includes: preliminary heating processing for controlling the operation of the tank circulation pump and the heat pump so that the temperature of the hot water flowing out of the heat pump becomes a first target temperature; and main heating processing for controlling the operation of the tank circulation pump and the heat pump so that, after finishing the preliminary heating processing, the temperature of the hot water flowing out of the heat pump becomes a second target temperature higher than the first target temperature. The temperature increase width of the hot water in the main heating processing is smaller than the temperature increase width of the hot water in the preliminary heating processing.SELECTED DRAWING: Figure 3 【課題】タンク滅菌運転の終了後に形成される中間温度成層の成層範囲を低減することが可能な技術を提供する。【解決手段】本明細書が開示する給湯システムは、貯湯タンクと、タンク循環路と、タンク循環ポンプと、ヒートポンプと、コントローラを備える。コントローラは、滅菌実施条件が成立すると、タンク循環ポンプによって貯湯タンクとヒートポンプの間で湯水を循環させ、ヒートポンプで湯水を加熱するタンク滅菌運転を実行する。タンク滅菌運転は、ヒートポンプから流出する湯水の温度が第１目標温度となるようにタンク循環ポンプとヒートポンプの動作を制御する予備加熱処理と、予備加熱処理の終了後に、ヒートポンプから流出する湯水の温度が第１目標温度よりも高い第２目標温度となるようにタンク循環ポンプとヒートポンプの動作を制御するメイン加熱処理を含む。メイン加熱処理での湯水の昇温幅は、予備加熱処理での湯水の昇温幅よりも小さい。【選択図】図３