Joined: 29 Nov 2014
|Posted: Sat May 05, 2018 8:23 am Post subject: www.camisetauruguaymundial.com
|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 Maximiliano Gomez Uruguay Camiseta , 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, the air supply or exhaust is adjusted to compensate.
When controlling a Variable Air Supply unit (or VAV Unit - Variable Air Volume) Jonathan Urretaviscaya Uruguay Camiseta , 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, 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 Maxi Pereira Uruguay Camiseta , 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, 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 Matias Vecino Uruguay Camiseta , 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.
Industrial Ventilation Systems Designer
Anti-corruption push targets lavish graves
China plans to rectify and punish violations of funeral regulations for Party members, such as unapproved types of burial and the purchase of oversize tombs, in the nation's latest effort to combat corruption.
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Party members are also urged to exhort close family members and colleagues to follow the guidelines. Those who violate funeral rules - including deceased Party members - will be corrected and punished, said an anonymous official in charge of issuing the guidelines, according to the MCA website.
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Another prominent problem is officials taking advantage of their power to throw lavish feasts at funerals and collect large sums of money Giorgian De Arrascaeta Uruguay Camiseta , Yang said.
The State Council in 2013 began to ban officials and Party members from holding extravagant funerals to collect money. It also encouraged Party members to donate their bodies or organs after death.
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