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How to measure the heat of hot water

How to measure the heat of hot water: The system of the dual flow meter system is shown in Figure 4.4. The measurement principle is to calculate the heat of the water supply and the heat of the return water separately.
The value is the measurement result. Expression is
A qmihi - qm.
An f(t.)
Where qrni - water supply mass flow, kglh;
- water supply ratio, kjlkg;
- water supply temperature, °C;
- return water mass flow, kg / h;
- return water ratio, kjlkg;
- return water temperature, °C.
The pump for water ratio and temperature is shown in Appendix D of this book.
In this system, the flow of return water is measured separately by two flow meters to monitor the loss of hot water. Because in a cold area, a heating season covers a long time, in addition to heating, hot water has a wide range of uses in other aspects of life, so the loss of backwater is very serious. If it is not metered and managed, not only does it lose a lot of heat, but it also loses fresh water.
This system is suitable for large users. Since two metering stations are required for one metering point, the investment is significantly larger than that of the single metering system.

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