The choice and design of the HVAC system can also affect many other high performance goals, including water consumption (water cooled air conditioning equipment) and acoustics (The following actions detail how engineers can design a quality system that is cost-competitive with traditional ventilation designs, while successfully providing an appropriate quantity and quality of outdoor air, lower energy costs and easier maintenance.The national consensus standard for outside air ventilation is ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality and its published Addenda. Uncontrolled ventilation with outdoor air can allow outdoor air contaminants to bypass filters, potentially disrupt the balance of the mechanical ventilation equipment and permit the introduction of excess moisture if access is not controlled.Strategies using natural ventilation include wind driven cross-ventilation and stack ventilation that employs the difference in air densities to provide air movement across a space. At a minimum, the following components should be labeled in each ventilation zone of the school and should correspond with the HVAC diagrams and drawings. The labels should be easy to read when standing next to the equipment and durable to match the life of the equipment to which they are attached.
The main purposes of a Heating, Ventilation and Air-Conditioning (HVAC) system are to help maintain good indoor air quality through adequate ventilation with filtration and provide thermal comfort.
A fresh air intake keeps your HVAC system supplied with well oxygenated, fresh air to improve comfort.Your heating and air conditioning system may or may not have a fresh air intake installed already. w.g.
In many existing schools, sheet metal ducts, as well as those constructed of or lined with insulation products, are often contaminated with mold because dirt and moisture found their way into the system.Duct board and duct liner are widely used in duct systems because of their excellent acoustic, thermal and condensation control properties. The system will pull this air through the return ducts throughout your home.
By sealing your home up as tightly as possible, though, you are sacrificing air quality for heating and cooling efficiency.As conditioned air is circulated throughout your home your heating and air conditioning system needs more air to condition, continuing the heating or cooling cycle. They are:Indoor air can be 2 to 5 times more polluted than outdoor air; therefore, most HVAC system designers understand that increased amounts of outdoor air supply is generally better for IAQ. If the system is not supplied with fresh air then it will use the same air over and over again. Posts by Category. For more information about the installation or replacement of a fresh air intake system in your Hendersonville, NC home, contact the experts at Comfort Central.Many homeowners are torn between enjoying fresh, pure air and reducing energy loss. Less well recognized areas in schools where special exhaust ventilation is desirable are janitor closets, copy/work rooms and arts/crafts preparation areas where off-gasing from significant quantities of materials or products may occur. Central air handling units have a number of advantages as compared to unit ventilators and heat pumps serving individual rooms. An inspection will also ensure that other parts of the system, such as the damper, are adjusted and working properly to minimize energy loss.
Call Comfort Central for more information.Everyone deserves to breathe fresh, clean air in their Asheville, NC home. Designers should investigate a method called vertical displacement ventilation or thermal displacement ventilation. Cleaner air – As your central air conditioning system draws air out of various rooms in the house through return air ducts, the air is pulled through an air filter, which removes airborne particles such as dust and lint. Energy recovery ventilation equipment can make the negative implications of 15 cfm per person of outdoor air behave like 5 cfm, while retaining the IAQ advantage of 15 cfm. See ANSI/ASHRAE Addenda 62t and 62w, Addenda to ANSI/ASHRAE Standard 62-2001, Ventilation for Acceptable Indoor Air Quality.As a secondary strategy, designers should consider methods of reducing the potential for future problems to occur due to unforeseen moisture contamination by investigating insulation products now on the market that minimize the potential for moisture to penetrate the insulation material.
However, it is not always possible to assure that ducts remain dirt and moisture free. Yet there are concerns over the implications that this added amount of outdoor air supply has on the first cost and operating cost of the HVAC system, as well as moisture control for the school (too wet or too dry).As a result, school designers often try to reduce the amount of outdoor air equal to — or even below — 15 cubic feet per minute (cfm) of outside air per person, the minimum for school classrooms, as established by the American Society of Heating, Refrigerating and Air -conditioning Engineers (ASHRAE) First cost, energy costs and moisture control do not have to be at odds with good IAQ. They can also provide supplemental exhaust ventilation during renovation activities that may introduce pollutants into the space.However, sealed buildings with appropriately designed and operated HVAC systems can often provide better indoor air quality than a building with operable windows.
One technique for doing this is to install carbon dioxide (COIf an auditorium fills up for school assembly, then COIn addition to "atmospheric dust," airborne particulates can include pollen, mold (fungal) spores, animal dander, insect proteins, pesticides, lead and infectious bacteria and viruses.
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