Finding the volume of accumulators

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To determine the required volume of hot water accumulators for a condominium, the calculated heat supply capacity of 147 kW is essential. This figure indicates the energy needed to maintain hot water supply, considering a usage rate of approximately 0.5 l/s. The purpose of the accumulator is primarily to provide make-up flow capacity, allowing for a steady supply of hot water without the need for instant heating with every demand. Understanding the relationship between heat supply and water flow helps in sizing the accumulator appropriately. Properly sized accumulators enhance efficiency and ensure consistent hot water availability.
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I'm calculating the size of the hot water accumulators for a condominuim. I know that the use of hot water is ~ 0,5 l/s (probability considered). The water is heated by an external hot water source through a heat exchanger. What I've done is to calculate the heat supply capacity using;

4,2*70*0,5 = 147 kW

I'm not really sure what to do with this number, or if I need it at all. How can it bring me closer to finding the required volume of the accumulators?
 
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What is the purpose of the accumulator? Is it for make up flow capacity? Shock absorption?
 
It is to make up for flow capacity as you said, so one wouldn't have to heat up the water directly in an instant each time some is used.
 
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