måndag 23 mars 2015

To evaluate acoustic pollution

To evaluate acoustic pollution, the sound power emitted by a sound source must be measured. This must be done in such a way that any kind of noise source, regardless of where it will later be used, can be quantified. One of the most accurate methods for measuring the sound power of small and medium sound sources is described in standard EN ISO 3741:1999 “Acoustics. Determination of sound power levels of noise source using sound pressure. Precision methods for reverberation rooms”. Eurovent chose this measurement method for the certification programme for air conditioners.
In 1994, the heat pump laboratory of CEIS (Centro de Ensayos, Innovación y Servicios, S.L.) was selected by Eurovent as an independent laboratory to perform the above measurements. The actual sound power measurements are carried out by the external laboratory UPLA at the Polytechnic University of Madrid.

fredag 13 mars 2015


Discussions. It also made clear that heat pumps are really beginning to break through market and other barriers and that all markets are showing signs of growth. China and Europe are good examples of significantly growing markets. “Heat pumps are where the action is” certainly applies to China with its booming construction sector and HVAC industry. Of course, the success of the conference was also the result of thorough preparation, the excellent location and the participation of over 300 people who came from all over the world.
The status of heat pumps can best be characterised by the diversity in technology, markets and developments. Examples are gas heat pumps, combined heat pumps and thermal storage, advances in CO2 technology for water heating, diversity in system design, and the broadly applied and expanding ground-coupled heat pump markets. New competing technologies are emerging, such as micro-CHP and fuel cells in residences and light commercial applications. There is no single solution available and this provides excellent opportunities for countries to collaborate and learn from each other.