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20s121 domestic hot water heating unit (selection and installation of hot water unit) pdf

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Water supply standard atlas
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Brief introduction: 20s121 domestic hot water heating unit (selection and installation of hot water unit) 2 scope of application 2.1 this atlas is applicable to the domestic hot water heating system of newly-built, reconstructed and expanded civil buildings, and the domestic hot water system of industrial buildings can be used for reference. 2.2 it is applicable to single hot water unit with rated thermal power no more than 100kW. 2.3 it is suitable for areas with altitude below 1000m. If it is used in areas with higher altitude, please contact the equipment manufacturer and explain when ordering. 3 Classification and selection of hot water unit 3.1 the classification of water heater set in this atlas is shown in table 103.2 selection of hot water unit. 3.2. 1. According to users' demand for hot water and building conditions, combined with local energy situation (supply price and reliability of natural gas, city gas, fuel oil and electric power), through comprehensive comparison and selection, the hot water unit which can meet the requirements of use, safe and reliable, high thermal efficiency, reasonable price and operation cost, and control and operation meeting management requirements shall be selected. 3.2. 2. According to the hardness of raw water, hot water quantity and water temperature, the influence on heat exchange coil and shell of unit shall be considered to determine whether to adopt water quality softening treatment facilities. 3.2. 3. When gas (oil) water heater is selected, Exhaust gas should be selected according to the For the boiler air pollutant emission standard > gb13271 and the local environmental protection requirements, the flue or chimney must match with the hot water unit, and measures should be taken to prevent ignition or damage to the building structure and prevent rainwater from flowing back. 3.2.4 the unit should adopt program control to realize full-automatic or semi-automatic operation, and should have overpressure, overtemperature, water shortage, water temperature, water flow, flame, power failure, etc Automatic alarm and protection function. 3.2. 5. In areas where sunshine hours are more than 1400h / A, annual solar radiation is greater than 4200mj / m2 and annual extreme minimum temperature is not less than - 45oC, solar energy is used as heat source of centralized domestic hot water supply system, and hot water unit is used as auxiliary heat source. 3.2. 6 the heat source units and water heating equipment of the central hot water supply system of the hospital shall not be less than 2 sets, and the water heating equipment of the hot water supply system of other buildings shall not be less than 2 sets. When one unit is overhauled, the total heating capacity of the remaining units shall not be less than 60% of the designed hourly heating capacity. Water heating equipment without cold and warm water stagnant area should be used in hospital buildings. The total rated power of the selected working hot water unit shall not be less than the calculated total heat supply of the unit.
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