Sizing up an accumulator

[mcluma]

Does anybody know where to find tables or calculations to size up an accumulator

somethign that takes into account the flow rate in and the usage

Thanks

 

[dcawkwell]

This is how I do it.

Calculate your demand eg 3 showers using 10 litres a minute for 15 minutes = 450 litres

Mains supply = 20 litres a minute over 15 minutes = 300 litres

Short fall is 150 litres.

So should be looking at maybe 200 litre unit.

Beware though the 200 litre unit would then take approx 8 minutes filling
again from the example above.

 

[mcluma]

That makes sense

 

[simond]

That is incorrect.

There are a few variables, if you want the unit sized for you why not ask the manufacturer to do it for you.

You will find a 200 litre virtually useless with three showers.

You will need to know the static water pressure, the i/c flow rate and the likely drawoff over a period of time.

On larger jobs we get the manufacturer to underwrite the solution, and we've done nearly 100.

 

[mcluma]

The static pressure is 2.5bar and the flow rate is arround the 15l per minute

I can call GAH out advise me

 

[mcluma]

Simond,

i read on other replies that you install the TWS system

in particular the TWS mainsboost accumulator,

what is your opinion on these

 

[DeltaT2]

It's a breaker tank & pump you need mate, accumulator will not cope with that demand or on such a low static pressure.

We replaced two with a breaker tank system last year, the demand at peak times were too high.

 

[transam]

take a look at the RM mains boost (accumulater) & charger unit (pump) set up ??

 

[mcluma]

I din't think that 2.5 bar was really that low?

I did had a look at that RM mains boost and looks very similar to tws or coldstream, but i cannot find the reseller for RMmains boost