Daikin Altherma 3 H HT W EPRA14DAV3 Installer's Reference Manual page 51

EPRA14~18DAV3+W1 + ETBH/X16EF6V+9W
Daikin Altherma 3 H HT W
4P644736-1 – 2021.02
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
Standalone DHW tank
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
▪ 150 l
▪ 180 l
▪ 200 l
▪ 250 l
▪ 300
compatible with solar kit)
▪ 500 l (compatible with solar kit)
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
l (polypropylene
Installer reference guide
tank is
51