Panasonic Aquarea WH-SXC09H3E5 - Cooling with Underfloor Heating; Cooling with Fan Coils; Installation Criteria; Acoustics

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Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Planning
5
ATTENTION
Risk of damage to building or of slipping on the oor
In cooling mode, a temperature 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 on the oor.
► Prevent the temperature from dropping below the dew point by suitable placement of dew
point sensors.
► Alternatively, safely drain the condensate that forms.
► In addition, insulate the pipes concerned to prevent di󰀨usion.
5.1.7.1 Cooling with underoor heating
Underoor heating (or any surface embedded heating system) is generally suitable for the cooling
mode, however cannot be operated with very low supply water temperatures, because the level
of comfort drops, and the danger of falling below the dew point arises. In general, therefore, the
surface temperature should be limited to at least 20 °C. If the temperature di󰀨erence between
supply and return water temperature (ΔT) is 3 to 4 K, it is possible to achieve a specic cooling
capacity of 30 to 40 W / m². The cooling capacity is inuenced considerably by the pipe distance
and the pipe diameter of the underoor heating as well as the oor covering. In the case of a tiled
oor, the heat transfer is signicantly better than, say, with a carpeted oor, which directly a󰀨ects
the cooling capacity.
Due to the systemic limits to the cooling capacity of underoor heating, room cooling cannot be
regulated to a xed indoor temperature. However, at least the supply water temperature must be
set to a value that prevents the room temperatur from dropping below dew point.
5.1.7.2 Cooling with fan coils
Fan coils can be operated with very much lower supply water temperatures than underoor
heating. Correspondingly, fan coils allow you to achieve a higher cooling capacity than underoor
heating and also greater comfort due to the type of room climate control. Due to the low supply
water temperatures, which can be obtained when using fan coils for room cooling, the pipe must be
covered by a di󰀨usion-proof insulation and the condensate must be drained via a connection pipe
to the house drainage system or to the outside.
5.2 Installation criteria
5.2.1 Acoustics
5.2.1.1 Sound pressure level
Sound is produced when air is made to start vibrating. This vibration widens as a pressure wave
in the air and this way travels from the sound emission source to the eardrum of the human
ear (immission point). 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
-6
Pa (audible threshold) to 20 Pa
(pain threshold). This 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 indicated as pressure but as a sound pressure level in Decibels (dB).
Typical sound situations and thereby occurring sound pressure levels and sound pressures
Sound Sound pressure level in
dB (A)
Sound pressure in μPa Sensitivity
Woods 20 100 Very soft
Library 40 1,000 Soft