hvac fresh air intake requirements

This approach has been proven in many schools in various regions east of the Rockies, where advanced HVAC systems cost roughly the same as conventional systems, yet provide significant operating cost savings and IAQ advantages.Classrooms and other school spaces must be ventilated to remove odors and other pollutants.If outside air is provided through a mechanical system, then at least 15 cubic feet per minute (cfm) of outside air must be provided for each occupant. However, it is more difficult to assure proper maintenance of multiple units over time and they present additional opportunities for moisture problems through the wall penetration and from drain pan and discharge problems. The unconditioned filtered fresh air is mixing with return air and then is treated by the air conditioning system – either heated or cooled.Must be away from contaminated fresh air – such as water heater vents, dryer vents, etc.The overall effect of a Fresh Air Intake is to dilute what pollutants are in your house, refresh the air and make it all more breathable.Just remember – the best filter in your house is your lungs. Central air handling units have a number of advantages as compared to unit ventilators and heat pumps serving individual rooms. HVAC systems are among the largest energy consumers in schools. 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. METHODS OF CALCULATING MINIMUM FRESH AIR REQUIREMENTS Job outline Sam from Fresh or Freezing has been asked to complete work on the air conditioning system for an office computer room at the Gateway Complex.

These areas should be maintained under negative pressure relative to adjacent spaces.To help ensure that proper operation and maintenance of HVAC system components will be performed, it is critical that the designer makes the components easily accessible. 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.

HVAC systems are among the largest energy consumers in schools. 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. 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. Uncontrolled fresh air can be very undesirable. Heating, Ventilation and Air-Conditioning (HVAC) Energy Code Requirements The energy requirements of the building code that apply to HVAC instal-lations (ECCCNYS Section 503) are in addition to any plumbing, mechan-ical, and fuel gas codes that apply to … The proper sizing and placement of openings is critical and the flow of air from entry to exit must not be obstructed (e.g., by closed perimeter rooms).In most parts of the country, climatic conditions require that outdoor air must be heated and cooled to provide acceptable thermal comfort for building occupants, requiring the addition of HVAC systems. Some measures require acceptance testing, which is addressed in Section 4.3.12.. This fresh air intake is open to the outside atmosphere 24 hours a day, 7 days a week. This represents a large opportunity to save energy throughout U.S. buildings. Demand controlled ventilation is addressed as a method of humidity control, but is not otherwise discussed here because its primary use is to reduce the supply of outdoor air below the recommended minimum for the purposes of saving energy, not for improving IAQ.Supplying acceptable quantities of outdoor air to occupied spaces is a critical component of good indoor air quality. Rooftop equipment should be accessible by way of stairs and a full-sized door, not a fixed ladder and a hatch.Labeling of HVAC components is an inexpensive and effective method for helping facilities personnel properly operate and maintain the HVAC systems. The majority of air conditioning systems installed in Texas do not have Fresh Air Intakes. 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.