Daikin Altherma 3 R F Installer's Reference Manual page 49

ERGA04~08EA + EHVH/X04+08S18+23EA/EJ
Daikin Altherma 3 R F
4P629086-1A – 2021.11
Determining the DHW consumption
Answer the following questions and calculate the DHW consumption (equivalent
hot water volume at 40°C) using 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 = (3×100 l)+(1×150 l)+(3×10 l)=480 l
Determining the volume and desired temperature for the DHW tank
Formula
V =V +V ×(T −40)/(40−T
1 2 2 2
V =V ×(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
Possible DHW tank volumes
Type
Integrated 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.
1 shower = 10 min×10 l/min = 100 l
1 bath = 150 l
1 sink = 2 min×5 l/min = 10 l
—
) If:
1
▪
▪
▪
Then V
If:
▪
▪
▪
Then V
▪ 180 l
▪ 230 l
6 Application guidelines
|
Typical water volume
Example
V =180 l
2
T =54°C
2
T =15°C
1
=280 l
1
V =480 l
1
T =54°C
2
T =15°C
1
=307 l
2
Possible volumes
Installer reference guide
49