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5.4.3 Selecting the volume and desired
temperature for the DHW tank
People experience water as hot when its temperature is 40°C.
Therefore, the DHW consumption is always expressed as equivalent
hot water volume at 40°C. However, you can set the DHW tank
temperature at a higher temperature (example: 53°C), which is then
mixed with cold water (example: 15°C).
Selecting the volume and desired temperature for the DHW tank
consists of:
1
Determining the DHW consumption (equivalent hot water
volume at 40°C).
2
Determining the volume and desired temperature for the DHW
tank.
Possible DHW tank volumes
Type
Integrated DHW tank
Standalone DHW tank
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. By selecting a larger DHW tank, you can lower the
desired DHW tank temperature.
The heat pump itself can produce domestic hot water of
maximum 55°C (50°C if outdoor temperature is low). The
electrical resistance integrated in the heat pump can higher this
temperature. However, this consumes more energy. Daikin
recommends to set the desired DHW tank temperature below
55°C to avoid using the electrical resistance.
The higher the outdoor temperature, the better the performance
of the heat pump.
If energy prices are the same during the day and the night,
Daikin recommends to heat up the DHW tank during the
day.
If energy prices are lower during the night, Daikin
recommends to heat up the DHW tank during the night.
When the heat pump produces domestic hot water, it cannot
heat up a space. When you need domestic hot water and space
heating at the same, Daikin recommends to produce the
domestic hot water during the night when there is lower space
heating demand.
Determining the DHW consumption
Answer the following questions and calculate the DHW consumption
(equivalent hot water volume at 40°C) using the typical water
volumes:
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 = (3x100 l) + (1x150 l) + (3x10 l) = 480 l
EHBH/X16
Daikin Altherma - Low Temperature Split
4P313776-1 – 2012.05
Possible volumes
180 l
260 l
150 l
200 l
300 l
Typical water volume
1 shower = 10 min x 10 l/min =
100 l
1 bath = 150 l
1 sink = 2 min x 5 l/min = 10 l
—
5 Application guidelines
Determining the volume and desired temperature for the DHW
tank
Formula
V
= V
+ V
x (T
- 40) / (40 - T
1
2
2
2
V
= V
x (40 - T
) / (T
- T
)
2
1
1
2
1
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
5.4.4 Setup and configuration – DHW tank
For large DHW consumptions, you can heat up the DHW tank
several times during the day.
To heat up the DHW tank to the desired DHW tank temperature,
you can use the following energy sources:
Thermodynamic cycle of the heat pump
Electrical backup heater (for integrated DHW tank)
Electrical booster heater (for standalone DHW tank)
Solar panels
For more information about:
Optimizing the energy consumption for producing domestic
hot water, see the configuration chapter.
Connecting the electrical wiring of the standalone DHW
tank to the indoor unit, see the installation chapter.
Connecting the water piping of the standalone DHW tank to
the indoor unit, see the installation manual of the DHW
tank.
5.4.5 Combination: Standalone DHW tank + Solar
panels
By connecting the DHW tank to solar panels, the DHW tank can be
heated by solar energy.
For installation instructions, see the installation manual of the solar kit
and addendum book for optional equipment.
c.4
c
c.3
a
c.2
b
Example
)
If:
1
V
= 180 l
2
T
= 54°C
2
T
= 15°C
1
Then V
= 280 l
1
If:
V
= 480 l
1
T
= 54°C
2
T
= 15°C
1
Then V
= 307 l
2
M
f
e
c.1
d
Installer reference guide
14
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