NIS-CO Company offers various models of Make-Up Air Units for larger industrial plants ventilation requirements.
Negative Air Pressure in industrial manufacturing facilities can create problems such as:
* Exhaust fans losing performance Jamal Murray Jersey , as the building pressure becomes negative.
* Pilot light outages and exhaust system failure on natural draft gas equipment.
* Cold air drafts and infiltration of dirt and contamination from outside.
* Difficulty opening or closing exterior doors.
NIS-CO air-handling units (AHU) can be used effectively for negative pressure control at manufacturing facilities:
Space Pressure Control is used to minimize and control the exchange of air between the building and the outside environment or from one building area to another. This may be accomplished in three ways:
- Constant air supply with variable-speed exhaust;
- Variable air supply with constant-speed exhaust;
- Variable Return-Air.
Constant air supply with variable-speed exhaust is recommended where a hot or contaminated environment must be ventilated while maintaining room pressure. Unit may be interlocked to that it only operates with the exhaust system.
Variable Air Supply with constant-speed exhaust may be preferred where fume exhausters or fume hoods are used to provide critical ventilation of contaminants from a “clean” environment while make-up air is used to maintain a positive pressure to prevent infiltration.
In either case, when the system is enabled, a pressure sensor in the building space monitors room pressure. When a high or low pressure reading is detected Kenneth Faried Jersey , the air supply or exhaust is adjusted to compensate.
When controlling a Variable Air Supply unit (or VAV Unit - Variable Air Volume), two methods are available:
- Damper Control - Unit discharge damper is adjusted using the damper motor.
- VFD (Variable Frequency Drive) – Controller adjusts the speed of the blower motor Discharge Damper adjustment is an older method of controlling discharge air volume. Its main advantage is that it only requires positional control of a small discharge damper motor. The major disadvantage is the wasted Horsepower of the blower motor at lower delivery rates.
In recent years, fan speed control using VFDs has become economical. In this application Malik Beasley Jersey , a standard energy efficient motor is usually adequate down to 75% of normal motor speeds. For a fan speed down to 25%, a premium efficiency motor is required. Inverter duty motors are not usually necessary since at 25% of normal fan speed, air delivery is minimal.
Variable Frequency Drives are also programmable. They are used to provide soft starts and to ramp motor speed up or down in response to signals from the control system.
Finally Richard Jefferson Jersey , in a generally “clean” environment without a critical need to remove large quantities of contaminants, a simple solution to building pressurization is a Return Air Unit with the return air damper motor controlled by building a pressure sensor. When building pressure increases, more inside air is returned through the unit Tyler Lydon Jersey , relieving the pressure. When building pressure falls, more outside air is supplied to the building in order to “pump up the pressure”. Precise control of building pressure by a single piece of equipment can thus be achieved.
Additional information can be found at the NIS-CO web site http:northernindustrialsupplycompanyproductsair_handling_units.
Oleg Cthetchel Industrial Ventilation Systems Designer NIS-CO Co. nisco@nisco.net http:northernindustrialsupplycompanyindex http:northernindustrialsupplycompanyproductsindex GERMANY’S Lukas Podolski will receive an appropriate farewell when the world champion plays England in a high-quality friendly today with the winger having become one of the country’s all-time greats, coach Joachim Loew said yesterday.
Podolski Trey Lyles Jersey , who is hugely popular among German fans, is set to earn his 130th and final cap and start as captain for the first time.
Germany will be missing several players through injury with Loew looking towards Sunday’s World Cup qualifier in Azerbaijan with his side top after four straight wins.
The 31-year-old Podolski, who made his debut back in 2004 Will Barton Jersey , is his country’s third most-capped player and is also fourth in the all-time scorers’ list with 48 goals.
“He is a unique specimen, no one can really replace him,” Loew told reporters. “For me it will be a beautiful moment but a sad one because he was one of the greatest players ever to come out of Germany.
“Lukas and myself have gone a long road together Jameer Nelson Jersey ,” said Loew, who has coached Podolski for all of his 13 years with the national team as assistant coach and then head coach since 2006. “We have gone over many hurdles, many tournaments Dikembe Mutombo Jersey , disappointments but also the biggest joy as coach and player with the World Cup victory in 2014. So the stage tomorrow is appropriate. Germany against England is the right atmosphere.”
Asked what made Germany so successful over the years, Podolski said it may have been sticking with the same coach over a decade.
“Maybe the main reason is that we have a good coach for more than ten years and after 2004 we started a road which maybe other nations did not start,” he said.
England have had six coaches over the same period.
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