Characteristics of flow measurement in buildings

Characteristics of flow measurement in buildings High-rise buildings in cities also require a lot of flow meters. According to its use, it can be divided into two categories, one is the flow meter used in the building automation (88) system, and the other is the meter for energy bill settlement. (Working) Flow measurement in building automation system In the building automation system, the fluid flow in and out of key equipment or devices is measured, and the measurement results are used for equipment operation status monitoring, control and equipment management. The measurement results are generally not used for trade settlement, so the requirements for measurement accuracy are not high. The instrument is generally selected by the building automation engineering company. The main considerations are the convenience of installation, the price and the failure of the instrument to affect the system operation. Flow measurement for the purpose of energy metering The tap water, gas, fuel oil, etc. in the building must be supplied externally, the chilled water, hot water, and cooling water of the air conditioner must be supplied to the user, and the steam generated by itself is sometimes supplied to other units, so , These fluids need to be measured, and the measurement accuracy must meet the requirements of trade settlement. The measurement results are used for external charging meters, and compulsory verification should be carried out according to regulations. Fluids such as chilled water and hot water are supplied to the user. In fact, the user does not consume the chilled water, hot water, etc., but only takes away the cooling capacity of the chilled water and the heat in the hot water. Therefore, the measured parameters should be exactly Cold and heat, the corresponding meters are cold meter and heat meter. In addition, water meters, gas meters and steam flow meters are required for metering tap water, gas and steam. The temperature of chilled water for air conditioning is not very low, generally 5〜Fresh water at 6 ℃; hot water for air conditioning is mainly used for heating, bathing, washing, etc. The temperature is not very high, mostly below 901:. Such use requirements and fluid conditions, the reasonable selection is electromagnetic flowmeter.

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