you need

- - Calculator.

Guide

1

Place a container of your heating system.In practice, this exercise is quite difficult, so use a rough calculation based on the value of the power system.When a power of 1 kW capacity systems imply equal to 15 liters.Accordingly, if the power of the boiler is 20 kW, the capacity of all elements of the heating system is considered equal to 300 liters (20x15 = 300).

2

determine the coefficient of expansion of the liquid that is used in your heating system.If you have a water heating system with a maximum temperature of 95 ° C, the coefficient of expansion for it to be about 4%.If the system used antifreeze, expansion of the system will increase: for 10% solution - 1.1 times, for a 20%
solution - 1.2 times, etc.Thus, expansion of the system, using a 20% solution of antifreeze, 4.8% (4h1,2 = 4.8).

3

Calculate the efficiency of the expansion tank

**well.To this end, the difference between the maximum working pressure and charge pressure of the expansion tank****and divide by the charge pressure, which add an additional 1 bar.Maximum operating pressure of the heating system for the garden will take to 2 bars, and the charge pressure will be equal to the static pressure (0.5 bar = 5 m).That is, for a height of 5 m efficiency of the expansion tank****and will be 0.5 (2-0,5) / (2 + 1) = 0.25).** 4

Calculate the capacity of the expansion tank

**well.The capacity of the heating system, multiply by a factor of expansion of the liquid used for heating, and divide by the efficiency of the expansion tank****well.When heat storage volume of 500 liters in the system used to heat the water tank design capacity****and make 128 liters (300 + 500) h0,04 / 0.25 = 128).**

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Note

Ethylene glycol (or antifreeze) is poisonous, its vapors are dangerous to humans.Therefore, when working with him caution.

Helpful Hint

capacity expansion tank is selected with a margin of about 30% in relation to the calculated value.

Sources:

- how to calculate the volume of the expansion tank