Varvara Lepchenko of the United States celebrates after the women's singles first round match against Jelena Ostapenko of Latvia at the 2017 Rogers Cup in Toronto Tony Bradley Jersey , Canada, Aug. 7, 2017. (XinhuaZou Zheng)
Weekly choices of Xinhua photo (July 31 - Aug. 6)
In pics: Daofu Tibetan houses in SW China's Sichuan
In pics: lotus flowers amid morning mist in E China
1st high speed railway in Inner Mongolia starts operation
In pics: "dad of pandas" in SW China's Chongqing Zoo
Military parade held to mark PLA 90th birthday (Part I)
SWAT team members take part in drill
Acrobatic show staged in China's Xinjiang
Ventilating Fan Co. makes high pressure blowers-in-series systems to achieve
static pressure, previously unachievable by single stage centrifugal
blowers.
Series and parallel connected blower installations are often
used to meet performance ranges beyond normal single stage blower capacities.
For systems that require high ststic pressure Ricky Rubio
Jersey , and especially high pressure TOGETHER with high
temperature (where standard multi stage, positive displacement, screw, or
regenerative type blowers can not be used) series of single stage centrifugal
blowers can be used. Many times additional blower in the system can be
advantageous. For instance Pete
Maravich Jersey , where two blowers are operating in series and one
breaks down, the other may be able to "limp" the system along while the
necessary maintenance is performed. Having on blower continue in operation can
often allow limited production while the other is being repaired. Also, there
are cases where having one blower continue in operation could prevent or at
least minimize system or equipment damage from such things as high temperature
ot contaminated airstreams.
Another advantage of blowers in series is
that of the availbale space. If system must be expanded and increaases the CFM
requirements, the allotted space for the original blower may not be large enough
for a single large blower Jonas
Jerebko Jersey , but might be large enough to istall two smaller
blowers in series to obtain the necessary pressure.
One more potentail
advatage for series operation is the likehood of initial cost savings. Although
each case must be evaluated individually, it is often more economical to select
two "smaller" blowers with their respectice smaller motors and drives than to
select one "larger" blower to do the job.
Series connected blowers are
those which have the outlet of the one blower exhausting into the inlet of
another blower. By connecting blowersa in such a manner, high static pressures
can be attained. This is accomplished as the second blower adds its pressure
capability to the system, increasing the capacity beyond the capabilities of the
first blower.
Ideally Jeff
Hornacek Jersey , two identical blowers installed in series would
result in the same CFM at the outlet of the second blower as the inlet of the
first one, and nearly twice the static pressure as that rated for either blower
alone. However, some variation will result in both air flow and combined
pressure because of the tendency of air to compress under pressure. A good
understanding of how atnoshperic pressure and absolute temperature affect
density is required. Both of these factors are involved in the proper selection
of blowers. Density is directly proportional to atmospheric pressure and is
inversely proportional to absolute temperature (degrees Rankine).
Caution
is necessary in selecting blowers for series installtion. It is generally
accepted that most pre-engineered blowers are capable of withstanding twice
their catalog rated static pressure. In other words, where two blowers are
installed in series the second blower housing should withstand the higher
pressure. There is Jae Crowder
Jersey , however, a need for concern when the combined pressure
exceeds twice the rated static pressure for one blower. In series applications
involving three or more blowers, or in any system in which positive or negative
pressure exists prior to the consideration of the blowers, special housing
reinforcement may be necessary.
For additional information please refer
to http:ventilating
Oleg Tchechel
Canadian Industrial Process
Engineer
Ventilating Fan
Co.
nisco@globalserve.net
http:www.ventilatingrequest
http:www.ventilatingoutsideindex
VIENNA Grayson Allen Jersey , March 23 (Xinhua) -- Michel Platini will be elected to a third term as UEFA head here on Tuesday as the only candidate for the European football governing body.
The 59-year-old, who led France to the European Championship in 1984, was first elected as UEFA president in 2007 and remained in the position in 2011.
Platini decided not to challenge Sepp Blatter for the FIFA presidency in May, but he is backing the three candidates - Prince Ali Bin Al Hussein Donovan Mitchell Jersey ,FIFA vice-president from Jordan, Dutch football federation president Michael van Praag and former Portugal international Luis Figo, battling the 79-year veteran. "FIFA needs new ideas, new programs Derrick Favors Jersey ," Platini said.
In his eight years of ruling UEFA, Platini has reinforced the stature of the Champions League, now one of the world's most valuable sports brands. UEFA says the current tournament will bring in 1.34 billion euros ($1.45 billion).
He insists clubs cannot spend more than they earn under UEFA's Financial Fair Play rules. Offenders face tough sanctions as Manchester City and Paris Saint-Germain have already discovered.
The European Championship for countries is also being reformed. Euro 2020 will be played in 13 cities in 13 different countries. A Nations League, which offers qualification for the European Championship finals Dante Exum Jersey , will from 2018 replace most of the friendlies played by European countries that get little attention.
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