HVAC Equipment Noise proofing and sensors

Noise protection measures are an important issue today when planning larger heat pumps, VRF/VRV and refrigeration systems. This is due to denser construction, greater sensitivity of the population to the environment and therefore also to noise, and stricter regulatory requirements. 
 
In many cases, this not only affects new systems, but also systems that are already in operation. 

This is where modern acoustic arbours come in, which not only aim to reduce noise emissions, but are also equipped with appropriate sensor technology to enable better control of the systems, monitoring of energy efficiency and early detection of anomalies in system operation. 

(1) /(2) Sensors for controlling the air inlet and outlet openings 

Control of the position of the air inlet and outlet louvres of the acoustic bonnet to optimise the air flow. The louvres can be set to 4 different positions via sensors to control the air volume flow:
Closed louvres = example for cold start of a heat pump at low outside temperatures / 45° = normal operation of the system up to 50% air volume / 60° = normal operation of the system up to 80% air volume / 90° full load operation or ‘Free Cooling’ mode for refrigeration systems.

(3) Refrigerant sensors 

Early detection of refrigerant losses and prevention of compressors running dry. Positioning of the sensors depending on the specific weight of the refrigerant. For systems with flammable refrigerant in combination with storm ventilation to prevent the accumulation of an ignitable quantity of refrigerant. 

(4) Air pressure sensors 

Air pressure sensors for measuring pressure losses and air velocity enable the systems to be optimised. The air velocity can also be optimised by combining this with controlling the position of the air inlet and outlet fins. 

(5) Sensor technology Measurement of temperature, humidity and sound 

Are a standard application in sensor technology. The air inlet temperature with the comparison of the temperature of the system's exhaust air is another way of identifying potential for optimising the systems. 
In future, the recording of acoustics during normal operation of the system with the ongoing adjustment of the acoustics during operation of the systems will be a possibility for the early detection of system faults, even in the event of the smallest acoustic change.

(6) Sound insulation on the inside

StratocellWhisper-FR-400 mm