Commercial Make-Up Air Handling Units 1

Tenderall Fan Co. developes Make-Up Air Unitss for larger industrial plants ventilation requirements. Negative Air Pressure in industrial manufacturing facilities can create problems along the lines of: * Exhaust fans losing performance, while 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 external to. * Difficulty opening or closing exterior doors. Tenderall Co. air-handling units (AHU) work extremely well effectively for negative pressure control at manufacturing facilities: Space Pressure Control must be used to lessen and control the exchange of air between the building additionally, the outside environment or from building area to a different. This is often accomplished in 3 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 mandatory the place hot or contaminated environment need to be ventilated while keeping room pressure. Unit may just be interlocked compared to that it only operates while using exhaust system. Variable Air Supply with constant-speed exhaust could be preferred where fume exhausters or fume hoods are used to provide critical ventilation of contaminants from your 鈥渃lean鈥?environment while make-up air can be used to hold a beneficial pressure to prevent yourself from infiltration. An invaluable, if the product is enabled, a pressure sensor in the building space monitors room pressure. Where a high or low pressure reading is detected, oxygen supply or exhaust is adjusted to compensate. When controlling a flexible Air Supply unit (or VAV Unit - Variable Air Volume), two methods are accessible: - Damper Control - Unit discharge damper is adjusted while using damper motor. - VFD (Variable Frequency Drive) 鈥?Controller adjusts the speed of the blower motor Discharge Damper adjustment may well be an older manner of controlling discharge air volume. Its main advantage is it only requires positional control over a smallish discharge damper motor. The main disadvantage will be wasted Horsepower of the blower motor at lower delivery rates. Previous few, fan speed control using VFDs has grown economical. In this application, a regular energy-efficient motor is often adequate as small as 75% of normal motor speeds. On a fan speed as far as 25%, reduced efficiency motor important. Inverter duty motors are not usually necessary since at 25% of normal fan speed, air delivery is minimal. Variable Frequency Drives may be programmable. One can use them to provide soft starts so to ramp motor hasten or down responding to signals on the control system. Finally, within the generally 鈥渃lean鈥?environment with not a critical really need to remove large quantities of contaminants, a fairly easy strategy to building pressurization can be described as Return Air Unit with all the return air damper motor controlled because they build a pressure sensor. When building pressure increases, more inside air is returned via the unit, relieving pressure. When building pressure falls, more outside air is within the building for you to 鈥減ump within the pressure鈥? Precise handle of building pressure by way of a single device can thus performed. More details can be located from the Tenderall company web-site http://tenderall.com/ahu/index.html. Oleg ChetchelIndustrial and Commercial Air Systems EngineerTenderall Fan Co.http://www.tenderall.com/fanblower/index.htmlhttp://tenderall.com/airhandler/index.html