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Tenderall Fan Co. produces industrial Make-Up Air Unitss for ventilation and heating of large industrial facilities.

Makeup air is vitally important to the health and welfare of a building and its occupants. If the proper amount of makeup air is not introduced into a space Mario Edwards Jr Camo Jersey , consequences can range from exterior doors that are hard to open or close, to buildups of carbon monoxide in the space, to fume hoods that don't actually control the contaminants they were intended to control. In addition, the outside air that is brought into a building to "make up" the amount of air that has been exhausted has a very significant impact on cooling and heating capacities.

Insufficient make-up air can lead to increased building infiltration and higher energy costs, not to mention unhappy building owners and uncomfortable occupants.

While there are no facts and figures to show how many buildings provide the correct amount of makeup air, it can be stated that there are probably a great many that do not have sufficient makeup air. And there's no one solution that is available for every building. Each building must be analyzed with a careful air balance calculation and evaluated based on the diversity of sources of exhaust air and infiltration.

The type of make up air equipment used, as well as its size, is usually dependent on the climate. Humid areas of the country require considerably larger-capacity units to dehumidify outdoor air. The supply air requirements for occupant comfort are generally air temperatures of 70 degrees to 75 degrees F with an rh of 50%. A good design criteria for air-handlung units engineers is to specify the unit performance at two operating conditions - a design day and an off-peak period such as a 70 degrees rainy day. The off-peak times of the year are actually more critical to evaluate the unit performance because this is the lion's share of the unit operation. Engineers also need to specify the maximum allowable supply air dew points.

Direct gas-fired equipment is the most efficient choice for makeup air. While indirect gas-fired equipment might have a nominal energy efficiency of 75% to 80%, a direct-fired unit will operate at a nominal 93%. Thus, the further north or more extreme the climate, the more valuable a direct-fired piece of equipment becomes.

It is also possible to experience condensation within the heat exchanger sections of indirect- fired units in very cold climates. If the heat exchanger is not properly pitched and drained and not constructed of stainless steel through all sections, then corrosion and premature failure can occur.

That's not to say that indirect gas-fired makeup air equipment doesn't have its place, but again, it comes down to the climate. Climates with high concentrations of combustible or potentially toxic elements in the air might not be suitable for direct-fired equipment as the air is directly exposed to the flame. Many applications allow the recirculation of some of the air from the space and return air that is laden with paint, solvents, or very fine powders would be better handled with an indirect gas-fired piece of equipment.

Additional information can be found at the Canada Blower company web site http:www.tenderallventilatorindex.

Oleg Tchetchel
Industrial Process Designer
Tenderall Fan Co.
http:www.tenderallcontactindex
http:www.tenderallindex
CHINESE smartphone maker Xiaomi has climbed back into the global top five vendors list as the global market shrunk annually, even if only by a fraction, for the first time in 2017, according to a Reuters report Friday.


Worldwide smartphone shipment volume in 2017 dipped by 0.1 percent to 1.47 billion, representing the first annual shrinkage, according to data released by IDC, a leading industry tracker. Another tracker, Strategy Analytics, indicated a 1-percent rise.


With consumers showing no strong desire to upgrade to more expensive new flagship devices, both China and the United States — the world’s largest and third-largest smartphone markets — saw a decline in the last quarter, leading to a 6.3 percent year-on-year drop in total shipment volume in the quarter according to IDC.


Strategy Analytics put the same figure at 9 percent, the biggest fall in smartphone history.


Despite the weak reception of iPhone X, Apple shipped more phones than Samsung in the last quarter, according to IDC data.


China’s Xiaomi replaced domestic rival Vivo to occupy the spot of the world’s fifth-largest smartphone maker after its smartphone shipment grew 74.5 percent to 92.4 million units in the year.


Samsung, Apple, and China’s Huawei and OPPO maintained their top four positions.


The market consolidated towards the top five vendors during the year as shipment volume by others combined dropped 11.7 percent.


Xiaomi, which is now exploring a public listing and valued at around US$100 billion, was once the largest vendor in China in 2014 and 2015 before sales stagnated over the next two years amid fierce competition.


It has regained growth momentum this year with affordable, innovative products and international expansion, usurping Samsung as the largest vendor in India.


The Chinese smartphone market in 2017 suffered its first-ever annual fall by 4 percent according to Canalys.


(ShenzhenDaily-Agencies)

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