80
Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Planning
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Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Planning
Location
Outside temperature θe (°C)
Annual average of the
outside temperature (°C)
Constance
-12
7.9
Magdeburg
-14
9.5
Mannheim
-12
10.2
Munich
-16
7.9
Münster (Westphalia)
-12
8.1
Nuremberg
-16
7.9
Passau
-14
7.9
Remscheid
-12
6.8
Rostock-Warnemünde
-10
8.4
Saarbrücken
-12
6.8
Stuttgart
-12
10.2
Ulm / Donau
-14
7.9
For existing buildings, you can alternatively use the approximate calculation method to de-
termine the heating load as described below. It should serve as a reference point, because a
number of factors play a role in the calculation, such as house type, heat insulation and the
ventilation behaviour. In the course of the years, the specific heat requirement of buildings has
dropped steadily due to the ever stricter heat protection requirements. Due to this fact, the per-
formances per square metre of residential area stated in the table below can be used.
Example of Germany: Typical values for the specific heat requirement of residential
buildings for rough determination of the heating 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 living area of 120 m²,
the required heating load thus calculated is 9.6 kW (80 W/m²).
The standard outside temperature for the residential house can be read from the table of the
standard 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-
ing 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 Establishment of the hot water requirement
The drinking water requirement can only be estimated based on the following table for various
comfort expectations.
Example of Germany: Typical hot water requirement per person for a single and two fami-
ly house 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 hot water requirement
can be very different. It is advisable to select the size of the hot water tank according to the hot
water requirement. Note that the hot water flow rate required (e.g. 120 litres for a bath) is cov
-
ered 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
CAUTION
Danger of illnesses due to growth of Legionella in water
Legionella can grow in hot water tanks, and can cause infectious diseases in humans.
►
Respect European and national requirements for avoiding Legionella multiplication
(example in Germany: DVGW Worksheet W551). For domestic hot water tanks with
more than 400 litres volume as well as in buildings with more than two residential
units, there may be higher requirements than for one- and two-family houses.
Summary of Contents for Aquarea B1
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