Tag Archives: exhaust air

Outside Air Intake – DDC Outside Air Economizer System

economizer dampersOutside air louvers allow the ddc control system to open dampers and introduce fresh air into the building. Building automation system, or the energy management system as it is sometimes called, monitors outside air temperature and humidity and based on a calculation and opens the outside air dampers when this calculation determines a precise set point. Introducing outside air into the building not only makes common sense it is also required by the Mechanical Code in commercial applications. This is required mainly for health reasons as it rids the building of volatile organic compounds and CO2 which is naturally produced by humans. Large concentrations of CO2 can build-up inside the building and needs to be vented as too much CO2 negatively affects human health. It is therefore important that along with the intake of outside air into the building there needs to be an exhaust air damper to maintain good building pressure. Negative pressure inside a building is bad as it causes infiltration moisture issues which leads to mold and mildew. Too much pressure also creates its own problems so it is important, with an outside air damper system, to monitor and maintain building pressure. Enthalpy wheels add to the efficiency of a good economizer system.

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Dust Smoke Filter Banks

Dust Smoke Filter BanksThese filter banks filter the exhaust air from a welding lab where lots of smoke, fumes and related dust ends up going through these smoke filter banks. Specialized filtering systems are commonly used in industrial areas where fumes, smoke, and dust can be hazardous to the health of people working there. These are tied in to special exhaust fans and the buildings DDC system. Whenever someone enters a booth to begin welding in the welding booths they engage the smoke/fume exhaust switch and an exhaust fan energizes to pull any fumes and smoke out of the booth area and through the duct work where it terminates at these filter banks. The DDC monitors the differential pressure across the filters so when the filters are loaded up a signal is sent to an operator to change the filters. Specialized filter systems can be used for dust collection, smoke and fume collection and mitigation, gas vapors, and mist from liquids.

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Prevent Poor Ventilation in the Home

You already know that inadequate ventilation in the home can lead to mold, mildew, and poor indoor airflow.This, in turn, can trap pollutants indoors, leading to allergies and other, more serious health risks. So what can you do to prevent this? Fortunately, you have several options, including energy efficient ones. Here are some of them. Install a Ceiling Fan Ceiling fans help circulate the air around your home. They reduce your cooling bill by drawing cool air upwards on warm days. In the winter, ceiling fans are also efficient, reducing your heating bill. For instance, if you use a fireplace, using a ceiling fan can make it more efficient by distributing the heated air.

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Desiccant Wheel in a Heat Recovery Unit

Desiccant Wheel in a Heat Recovery UnitThis is a desiccant wheel in a heat recovery unit. Mainly used in HVAC commercial applications where codes require a specified amount of fresh air for buildings. The old way was to pull the unconditioned fresh air and then condition the air using the mechanical equipment installed in the building. Using a heat recovery wheel will save energy by conditioning the air before it is introduced into the building and the mechanical equipment used to condition the air inside the building. Exhaust air flows through the desiccant wheel one way while fresh outside air flows through the wheel going the other way. The exhaust, while containing conditioned air, transfers energy to the wheel. The wheel turns slowly and the incoming outside air absorbs this energy or conditioned air. In the summer, the wheel reduces the humidity and temperature of the incoming outside air while in the winter increases the temperature of the incoming outside air.

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Rooftop Air Handler with Integral Heat Recovery

Rooftop Air Handler with Integral Heat RecoveryThis large rooftop air handling unit also has a heat recovery wheel integrated inside the air handling unit itself. The all in one air handler and heat recovery unit saves energy by recovering heat that would otherwise be vented outside in the winter time and in the summer removing heat from the air that is used for economizer and minimum outside air. In the winter the outside air dampers will open to bring fresh air into the building and vent stale air out of the building. The air inside the building contains heat. As the air is passing through the duct to be vented outside it encounters a heat recovery wheel. The air hits the heat recovery wheel and keeps moving past the heat recovery wheel but it leaves some of the heat it contained in the heat recovery wheel. The wheel is turning and this heat contained in this wheel (from the old stale air) turns to the duct where the fresh outside air is entering the building. This cold air hits the wheel and absorbs some of the heat that was left there by thew old exhaust air that was vented outside.

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MONDAY, APRIL 14, 2014

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