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How to measure the quality of hot water?

How to measure the quality of hot water
In the hot water heat metering system, the hot water mass flow is the basis of the heat calculation. The hot water mass flow calculation usually has two tasks. One is to correct the mass flow measurement error introduced by the actual operating temperature from the design condition; The second is to multiply the volume flow signal measured by the flow sensor and the transmitter by the hot water density corresponding to the water supply temperature or the return water temperature to obtain the hot water mass flow.
(1) The mass flow rate of the orifice flowmeter is calculated. The orifice flowmeter used to measure hot water is generally designed according to the mass flow rate, but the fluid temperature at the installation site must be equal to the design temperature to obtain the expected accuracy. degree. When the actual temperature deviates from the design temperature, the expected accuracy can only be obtained by compensating according to the specified relationship.
For the orifice flowmeter, the compensation can be performed in the heat meter, because the flow signal and the fluid temperature signal have been introduced into the heat meter, only the independent variable according to the compensation is specified, and the corresponding coefficient is written, and the instrument can be automatically operated after running. Make compensation.
Differential pressure flowmeter compensation can be used as follows, ie
k=√l+rui(≠td)×10 - 2 +)/t2(≠ td)2×10 6 (4.7)
Where k-compensation coefficient;
£——fluid temperature, °C;
Td - reference temperature (design state humidity), °C;
- one compensation coefficient, °C_1;
129
——Secondary compensation coefficient, °C_2.
The fluid temperature ≠ should be determined according to the installation position of the flowmeter. If the flowmeter is installed at the inlet of the heat exchange circuit, specify t= ti; if the flowmeter is installed at the outlet of the heat exchange circuit, specify t-t

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