Panasonic Aquarea WH-SDC16H6E5 - Determination of the Domestic Hot Water Demand

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Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Planning
5
Example of Germany: Typical values for the specic heating load of residential buildings for
rough determination of the design heat load
Existing building up to 1977 130 to 200 W / m²
Building after 1977 70 to 130 W / m²
Building after 1982 60 to 100 W / m²
Building after 1995 40 to 60 W / m²
Building after 2002 30 to 50 W / m²
Low energy house 25 to 40 W / m²
Ultra-low energy house 15 to 30 W / m²
Passive 10 W / m²
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 Daily requirement per person in
litres (45 °C)
kW per person and day
Low 15 to 30 0.6 to 1.2
Normal 30 to 60 1.2 to 2.4
High 60 to 120 2.4 to 4.8
Washing machine or dishwasher
with hot water mode
≈ 20
(See manufacturer's documents)
0.8
Depending on the number of persons and the comfort expectations, the domestic hot water
demand can be very di󰀨erent. 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
Persons Tank volume
2 to 3 200 l
3 to 6 300 l
> 6 > 300 l