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Semi-instantaneous tap water system
AquaStore
Applications
AquaStore is a semi-instantaneous Tap Water System designed
to provide Domestic Hot Water in large quantities – up to
1200kW – for applications such as apartment buildings,
hospitals, hotels, retirement homes, nursing homes, schools,
sports centres, prisons, …
Different models of AquaStore are available to fit with any
installation arrangement. For instance, AquaStore operated
with a 3-Port or 4-Port valve can be connected to local boilers
on site or primary tanks. AquaStore operated with a 2-Port
valve would match requirements of district networks when the
Tap Water System is directly connected to the city pipework.
When it comes to the selection of the heat exchanger, AquaStore
offers a large choice of possibilities: Plates&Gaskets,
Copper Brazed or AlfaNova®: exclusive to Alfa Laval (100%
Stainless Steel, Fusion Bonded).
Dependable performance
Since 1923, Alfa Laval has been in the water heating business,
and has become a leading manufacturer and supplier.
AquaFlow incorporates a wealth of background experience
for secure and reliable hot water production. The components
have been carefully selected and tested to perform well in
combination with one another.
Principle
On the primary side, AquaStore has to be fed by a heating
source that can be provided by any source of energy: local
boiler, district network, primary tank, solar system, …
On the secondary side, AquaStore is connected to a storage
vessel on site and to the water main (CW). The charging pump
(PC) located on the Domestic Hot Water side of the heat
exchanger is used to store the storage vessel with hot water.
When there is no or limited tapping of Domestic Hot Water,
the storage vessel is gradually heated up to the setpoint temperature.
When tapping occurs, hot water is being drawn from
the top of the storage vessel.
When the Domestic Hot Water demand corresponds to the
energy supply, the heat exchanger compensates without
affecting the quantity of stored hot water. The stored hot water
is only used for peak period when the Domestic Hot Water
demand is higher than the energy supply. In that case, the
available flow rate of Domestic Hot Water corresponds to the
flow rate provided by the heat exchanger combined with the
volume of stored hot water in the storage vessel. In the event
that the storage vessel is emptied out before the end of the
peak period, AquaStore will always provide Domestic Hot
Water at a nominal flow rate corresponding to the energy input.
A circulation pump (PR) is usually used to limit the time needed
to deliver Domestic Hot Water to the tap at the right temperature.
The circulation pump maintains a minimum flow rate through
the heat exchanger and through the distribution pipework.
Energy is exchanged through the heat exchanger from the
primary to the secondary side.
AquaStore
