Refrigeration Technology And Performance Criteria; Determination Of Design Outside Temperature And Design Heat Load - Panasonic Aquarea WH-ADC0309J3E5 Planning And Installation Manual

Planning
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5.1

Refrigeration technology and performance criteria

5.1.1 Determination of design outside temperature and design heat
load
5
The heat load of a building is determined according to EN 12831 "Energy performance of buildings
- Method for calculation of the design heat load" and the possible valid national appendices and
is seen in the planning documents for new buildings. The design heat load is calculated for the
design outside temperature θe. The design outside temperature is the lowest two-day average of
the outside temperature, which has been reached or fallen below 10 times in 20 years. The design
outside temperature is therefore suitable as the design point for the heat pump.
Example of Germany: Determination of the design outside temperature θe according to
EN 12831 Annexure 1
Location
Berlin
Bremerhaven
Eisenach
Frankfurt / Main
Hamburg-Fuhlsbüttel
Constance
Magdeburg
Munich
Nuremberg
Rostock-Warnemünde
For existing buildings, you can alternatively use the approximate calculation method to determine
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 insulation requirements. Due to this fact, the performances per
square metre of heated living space stated in the table below can be used.
92
Design outside temperature θe (°C)
-14
-10
-16
-12
-12
-12
-14
-16
-16
-10
Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Annual average of the
outside temperature (°C)
9.5
9.0
8.8
10.2
8.5
7.9
9.5
7.9
7.9
8.4