Water Source Heat Pumps Sound Levels

A very important issue in the design of air conditioning systems is the sound levels that can be achieved in the treated areas. The Carlyle Environmental range of Heat Pumps have very low sound levels and for the wall/floor mounted models up to and including 2.5 kW total cooling these are probably the lowest of all available W.S.H.P’s The Sound Power spectra for ARO wall/floor models are reproduced below:- The importance of low sound levels for hotel applications is paramount. The Hotel Series of W.S.H.P’s are specially treated to achieve even lower sound levels as shown in the table below:-

Console Models (reference 10-12 Watt) The values indicated are levels of acoustic power generated by the machine.

Water Source Heat Pumps [WSHP] are not manufactured as calibrated sources. Variations will occur within manufacturing tolerances. The level of acoustic power is the preferred criterion, if measurements are taken in ideal conditions.
Conversion from power level to pressure level. [SWL to SPL]
The difference between Sound Power Level and Sound Pressure level is a function of the sound absorption in the room and the distance from the sound source.
SWL - Room Effect = SPL

Hotel Series
Sound Power Levels calculated from Sound Pressure Levels measured in situ in the Bedroom, with the microphone in the centre of the room at the head of the bed.