ᐅ What is more economical? Charging the buffer tank more frequently or heating it up to a higher temperature?
Created on: 2 Jan 2020 11:31
F
fonsi99
Good day.
I am interested in understanding how to operate a buffer tank economically in combination with pellets, solar, and a domestic hot water system.
Is it better to maintain higher holding temperatures, for example around 75°C (167°F) at the top and bottom of the buffer tank, while the system recharges more frequently from the boiler at 70–75°C (158–167°F) to maintain the minimum temperature of 75°C (167°F)?
Or is it preferable to have higher minimum temperatures at the bottom of the buffer tank, around 60°C (140°F), which would still result in approximately 75°C (167°F) at the top? This would require the boiler to reheat more often (i.e., temperatures around 60°C (140°F) at both top and bottom).
Could anyone provide advice on this?
Thank you.
I am interested in understanding how to operate a buffer tank economically in combination with pellets, solar, and a domestic hot water system.
Is it better to maintain higher holding temperatures, for example around 75°C (167°F) at the top and bottom of the buffer tank, while the system recharges more frequently from the boiler at 70–75°C (158–167°F) to maintain the minimum temperature of 75°C (167°F)?
Or is it preferable to have higher minimum temperatures at the bottom of the buffer tank, around 60°C (140°F), which would still result in approximately 75°C (167°F) at the top? This would require the boiler to reheat more often (i.e., temperatures around 60°C (140°F) at both top and bottom).
Could anyone provide advice on this?
Thank you.
tomtom79 schrieb:
Only now it is mentioned that it is a multi-family house. But since it is a fresh water system, you actually don’t have problems with Legionella. Yes, I know there is only a very small residual risk...
Practically zero.
But in a multi-family house, there are some who still want that...
It is often stated here that 60°C (140°F) is required or even mandatory, regardless of the type of water heater.
B
boxandroof2 Jan 2020 14:05fonsi99 schrieb:
So you mean increasing the upper buffer temperature more often to recharge, rather than heating almost the entire buffer at once. So, focus on maintaining around 75°C (167°F) at the top and about 60°C (140°F) at the bottom (which is sufficient for underfloor heating).No. What I meant is that it probably doesn’t matter as long as the storage losses remain inside the house, thus easing the load on the main heating system.Losses that leave the house through the chimney need to be minimized by appropriate combustion operation. Unfortunately, I can’t help with exactly how to achieve this.
If the equipment is located somewhere like the basement of an apartment building, storage losses there are effectively “lost” energy and should be minimized or taken into account.
With solar thermal systems, lower storage temperatures are practical to ensure that the heat collected from the roof is actually utilized.
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