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Planning
5.1.7 Cooling
Aquarea heat pump models with cooling function are switched over manually from heating
mode to the cooling mode and must be switched back to the heating mode after completing the
cooling period.
CAUTION
Danger of damage to building or risk of slipping in the floor area
In the cooling mode, a drop below dew point can cause condensation of moisture from the air
on the surface of the heat transfer systems. This can damage the building or pose the risk of
slipping in the floor area.
► Prevent the temperature from dropping below the dew point by suitable placement of
dew point sensors.
► Alternatively, the condensate that forms can be safely diverted.
► In addition, insulate the pipelines concerned to prevent diffusion.
5.1.7.1 Cooling with Underfloor Heating
Underfloor heating is generally suitable for the cooling mode, however cannot be operated with
very low water inflow temperatures, because the level of comfort drops, and the danger of falling
below the dew point arises. In general, therefore, the surface temperature is limited to at least
20 °C. If the spread of the water inflow and water return temperature is from 3 to 4 K, it is pos-
sible to achieve a specific cooling capacity of 30 to 40 W / m². The cooling capacity is influenced
considerably by the pipe distance and the tube diameter of the underfloor heating as well as the
floor covering. In the case of a tiled floor, the heat transfer is distinctly better than, say, with a
carpeted floor, which directly affects the cooling capacity.
Based on the system limits of cooling capacity of underfloor heating, room cooling cannot be
regulated to a fixed indoor temperature. At least the water inflow temperature must be set that
prevents falling below the dew point.
5.1.7.2 Cooling with fan coils
Fan coils can be operated with very much lower water inflow temperatures than underfloor
heating. Correspondingly, fan coils allow you to achieve higher cooling capacity than underfloor
heating and also greater comfort due to the type of room climate control. Due to the low water
inflow temperatures, a diffusion-proof insulation of the pipeline as well as connection of the
condensate discharge to the house drainage system or discharge of the water condensation to
outside must be considered when using fan coils for room cooling.
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Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
5.2
Installation criteria
5.2.1 Acoustics
5.2.1.1 Sound pressure level
Sound is produced if air is set in vibration. This vibration widens as a pressure wave in the air
and this way reaches from emission source to the ear drum of the human ear (immission sort).
Irrespective of the type of sound (language or engine sound), the sound can be measured as
sound pressure. The higher the sound pressure, the louder is the sound perception. The human
ear can perceive a range from 20 x 10
range, which corresponds to a ratio of 1:1,000,000, is however not perceived by the human ear
in a linear manner, but a logarithmic one. For this reason, the sound pressure is also not indicat-
ed as pressure but as a sound pressure level in Decibels (dB).
Typical Sound Situations and thereby occurring Sound pressure levels and Sound
pressures
Sound pressure level in
Sound
Woods
Library
Conversation
Road
Press air hammer
The result of the non-linear perception of the sound pressure is that two equally loud sound
sources are not perceived doubly as loud as one sound source, but only as 3 dB. Doubling the
sound intensity (volume) of a sound is linked to a sound pressure level increase by 10 dB.
The measurable sound pressure level, which is converted to take into account other factors
such as sounds containing pitch in a rating level, are decisive for maintaining the limit values.
This must not exceed the valid immission guide values for immission types outside buildings
(example of Germany: Technical instructions for protection against noise) (TA noise)).
Example of Germany: Immission Guide Values according to TA Noise
Industrial Areas
Commercial areas
Business zones
General residential zones
Purely residential areas
Spa areas, hospitals
Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Pa (audible threshold) to 20 Pa (pain threshold). This
-6
Sound pressure in μPa
Sensitivity
dB (A)
20
100
Very soft
40
1,000
55
10,000
normal
80
100,000
Loud
100
1,000,000
Very loud
During day and night
70 dB(A)
Days
65 dB(A)
Nights
50 dB(A)
Days
60 dB(A)
Nights
45 dB(A)
Days
55 dB(A)
Nights
40 dB(A)
Days
50 dB(A)
Nights
35 dB(A)
Days
45 dB(A)
Nights
35 dB(A)
Planning
Soft
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