ERIC Number: ED415665
Record Type: Non-Journal
Publication Date: 1996-Jun
Reference Count: N/A
HVAC System Automatic Controls and Indoor Air Quality in Schools. Technical Bulletin.
Wheeler, Arthur E.
Fans, motors, coils, and other control components enable a heating, ventilating, and air-conditioning (HVAC) system to function smoothly. An explanation of these control components and how they make school HVAC systems work is provided. Different systems may be compared by counting the number of controlled devices that are required. Control systems are categorized according to their means of data processing, transmission, and power source: pneumatic, electric, electronics, direct digital, and self-powered. Likewise, the HVAC system is composed of various components: sensors, controllers, actuators (the system's power elements), and controlled devices, (e.g., dampers, valves, and speed regulators). All of these control elements work together to form a control loop. An overview of HVAC systems controls is offered, which focuses on unit ventilators, variable air volume systems, rooftop air conditioning, and supplemental systems. Monitoring the HVAC is also important, and methods such as multiple location supervision are explored. It is suggested that control system maintenance is another important component of any HVAC system, which entails the inventorying of tools and parts. Some control problems that may affect IAQ are provided. (Contains four figures, six references, and a glossary of terms.) (RJM)
Descriptors: Air Conditioning, Air Conditioning Equipment, Air Flow, Climate Control, Elementary Secondary Education, Energy Conservation, Energy Management, Facilities Management, Heating, Indoor Air Pollution, School Buildings, Thermal Environment, Ventilation
Maryland State Dept. of Education, School Facilities Branch, 200 W. Baltimore St., Baltimore, MD 21201. (Free to Maryland public schools; $8 for others).
Publication Type: Guides - Non-Classroom; Reports - Research
Education Level: N/A
Audience: Administrators; Practitioners; Support Staff
Sponsor: Environmental Protection Agency, Washington, DC. Office of Radiation and Indoor Air.
Authoring Institution: Maryland State Dept. of Education, Baltimore.