GB 50015-2019 第2.1.9条
| Hot water system: hot water supply temperature 55–60℃, return water temperature ≥50℃; for hotel buildings, the return main pipe diameter of the hot water circulation pipeline shall be ≥DN25. |
| Hot water system: hot water supply temperature 55–60℃, return water temperature ≥50℃; for hotel buildings, the return main pipe diameter of the hot water circulation pipeline shall be ≥DN25. |
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