After the completion of the scheme, measurements indicate that A-weighted sound pressure level is less than or equal to 60 dB (A) during the day and less than or equal to 50 dB (A) at night, which meets the relevant national noise limit emission standards and conforms to the second...
According to the modelling results, a heat exchanger with flat tubes and plain fins is the most suitable out of the studied designs due to its low heat transfer resistance on the tube side. The round tube heat exchangers showed to be significantly less suitable, displacing more than twice the...
noise contributions to the overall noise level would be less than 1.0 dB(A) and the “New” road noise levels at these NSRs would be all below 70 dB(A). devb.gov.hk 不過,「新」產生的道路噪 音令整體噪音水平上升的幅度會少於 1.0 分貝(A);在這些易受噪音影響 的地方,「新」道路噪音水...
And finally, the sensitivity and frequency response of passenger's ears, and the processing in the brain (CPS, 2023; CAPD, 2023; Souffi, 2023), may be less than perfect, making it difficult to discriminate against the noise. For the traveler, high-quality headphones with noise suppression ...
10) 304 stainless steel shell, rustless and longer lifetime. Mature Full Inverter Technology: After 8 years of research, designing and advancement by our international engineer team from Singapore and China, HEEALARX has fully m...
... requirements, the PZ 2400 offers 10% more power (2,400 BHP), 30% less weight and a smaller footprint (20% less) of competing pumps in its class. It is, quite simply, a game changer for rigs looking to upgrade their existing ... Compare this product gear pumpGA for chemicals...
The unit is supplied with two duct connections, one of which is used to supply and duct the wasted cool and less humid air discharged from the heat pump to locations that need ventilation of dehumidification, the other one is use...
Moreover, the extremely small size of most of slit (less than 10 µm) makes the filtration of the water is a cumbersome problem in open-circle water hydraulic system. Therefore, the PV-water pump is usually used in WHVBS due to its superior sealing capability and abrasion resistances ...
Not only does the separation problem suggest rather more severe water hammer with cavity rejoin but also there have been many cases ofnoise disturbancewhich makes conditions intolerable in the vicinity. It has also been observed that very bubbly separation may mean less water hammer. ...
The first pump apparatus200is coupled to the cathode side of the fuel cell100to supply oxygen or air to the cathode in the fuel cell100. The first pump apparatus200includes an air pump or a blower. The first pump apparatus200supplies enough air containing oxygen of no less than a required...