Daikin Altherma 3 WS EWSAH06UD 9W Series Installer's Reference Manual page 46

6 | Application guidelines
Installer reference guide
46
Question
How many showers are needed per
day?
How many baths are needed per day?
How much water is needed at the
kitchen sink per day?
Are there any other domestic hot water
needs?
Example: If the DHW consumption of a family (4 persons) per day is as follows:
▪ 3 showers
▪ 1 bath
▪ 3 sink volumes
Then the DHW consumption = (3×100 l)+(1×150 l)+(3×10 l)=480 l
Determining the desired temperature for the DHW tank
Formula
V =V +V ×(T −40)/(40−T
1 2 2 2
V DHW consumption (equivalent hot water volume at 40°C)
1
V Required DHW tank volume if only heated once
2
T DHW tank temperature
2
T Cold water temperature
1
DHW tank volume
Integrated DHW tank volume: 180 l (=V
INFORMATION
DHW tank volume. You cannot select the volume of the DHW tank because only one
size is available.
Energy saving tips
▪ If the DHW consumption differs from day to day, you can program a weekly
schedule with different desired DHW tank temperatures for each day.
▪ The lower the desired DHW tank temperature, the more cost effective.
▪ The heat pump itself can produce domestic hot water of maximum 55°C. The
electrical resistance (backup heater) integrated in the heat pump can increase
this temperature. However, this consumes more energy. We recommend to set
the desired DHW tank temperature below 55°C to avoid using the electrical
resistance.
▪ When the heat pump produces domestic hot water, depending on total heating
demand and the scheduled priority setting, it might not be able to heat up a
space. In case you need domestic hot water and space heating at the same time,
we recommend to produce the domestic hot water during the night when there
is lower space heating demand or during the time when occupants are not
present.
1 shower = 10 min×10 l/min = 100 l
1 bath = 150 l
1 sink = 2 min×5 l/min = 10 l
—
)
1
)
2
Typical water volume
Example
If:
▪ V =180 l
2
▪ T =54°C
2
▪ T =15°C
1
Then V =280 l
1
Daikin Altherma 3 WS
4P675765-1 – 2022.04
EWSAH/X06UD