Determination Of The Domestic Hot Water Demand - Panasonic Aquarea WH-ADC0309J3E5 Planning And Installation Manual

Example of Germany: Typical values for the specific heating load of residential buildings for
rough determination of the design heat load
Existing building up to 1977
Building after 1977
Building after 1982
Building after 1995
Building after 2002
Low energy house
Ultra-low energy house
Passive
Example
In the case of a residential house in Frankfurt/Main from the year 1992 with a heated living space
of 120 m², the design heat load thus calculated is 9.6 kW (80 W/m²).
The design outside temperature for the residential house can be read from the table of the design
outside temperatures for the observed location with θe = -12 °C. The heat pump should therefore
provide the determined heating capacity of 9.6 kW at an outside temperature of -12 °C.
!
IMPORTANT
The approximate calculation method shown only yields rough reference values for the heat load.
For correct designing, a heating expert must precisely calculate the required heating capacity
in order to provide the correct design. Panasonic cannot be held responsible for any wrong
calculations under any circumstances.

5.1.2 Determination of the domestic hot water demand

The domestic hot water demand can only be estimated based on the following table for various
comfort expectations.
Example of Germany: Typical domestic hot water demand per person for one or two family
houses at 45 °C tapping temperature.
Comfort expectation
Low
Normal
High
Washing machine or dishwasher
with hot water mode
Depending on the number of persons and the comfort expectations, the domestic hot water
demand can be very different. It is advisable to select the size of the domestic hot water tank
according to the domestic hot water demand. It is important to make sure that the hot water output
capacity required (e.g. 120 litres for a bath) is covered by the tank volume. At the same time, do not
choose an unnecessarily large tank volume, to ensure low dwell time in the tank. For one and two
family houses, the tank sizes given in the following table are recommended.
Example of Germany: Recommended tank sizes for one and two family houses
Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Daily requirement per person in
litres (45 °C)
15 to 30
30 to 60
60 to 120
(See manufacturer's documents)
Persons
2 to 3
3 to 6
> 6
130 to 200 W / m²
70 to 130 W / m²
60 to 100 W / m²
40 to 60 W / m²
30 to 50 W / m²
25 to 40 W / m²
15 to 30 W / m²
10 W / m²
kW per person and day
≈ 20
Tank volume
200 l
300 l
> 300 l
Planning
0.6 to 1.2
1.2 to 2.4
2.4 to 4.8
0.8
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