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Calculation of the water heater tank depending on the priority, it can be performed in two ways. In one case, the stored volume of water is given and the power of the source and heat exchanger is calculated, and in the other – the volume of the storage water heater is calculated for the accumulation of heat produced by a source of a certain power for a certain time.
Regardless of the calculation methods, it should be understood that the ability of water to accumulate characterizes its heat capacity, which is equal to 4.187 kJ kg/°C, which means that to heat one kilogram of water by 1 degree, it is necessary to add the amount of heat equivalent to 4.187 kJ or that too exactly = 1 kcal = 1.163 W. For example, if we have a storage water heater with a volume of 1000 liters (further on, the mass of 1 liter of water is assumed to be 1 kg) and we heat it to 50 degrees, then for this we will need to supply such an amount of heat energy 1000*50 = 50,000 kcal = 0.05 Gcal = 58 kWh.
The power of the heat exchanger depends on the heat transfer coefficient and the temperature difference between the heated water and the heated water. The heat transfer coefficient is individual for each heat exchanger, therefore there is no universal calculation formula and it is recommended to choose a heat exchanger according to the diagrams presented in the technical characteristics of storage water heaters.
Selection of the water heater tank depending on the application scheme, it is performed using different techniques, but in general, it should be taken into account during selection.
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