HVAC Heating, Ventilation, & Air Conditioning By Cody Parham Greg Nicolas Joe Kopiness Richard Warren Tom O’Neil SCOPE • To explain what HVAC is and how it is used • To show the different types of HVAC systems • To list the major materials used in an HVAC system • To show symbols used in the HVAC schematics • To illustrate the use of symbols in a full schematic Overview • What is HVAC • Systems • Materials • Symbols • Full Schematic • Acknowledgements • Questions What is HVAC? • The term “HVAC system” is used to refer to the equipment that can provide heating, cooling, filtered outdoor air, and humidity control to maintain comfort conditions in a building. • The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has established standards which outline air quality for indoor comfort conditions. Typical HVAC Systems Typical HVAC Systems • Outdoor air intake • Outdoor air control • Air filter • Heating and cooling coils • Humidification equipment • Supply fan • Ducts • Terminal device • Return air system • Exhaust fans and air outlet • Self-contained heating or cooling unit • Control • Boiler • Cooling tower • Water chiller TYPES OF SYSTEMS 1. Residential 2. Commercial 3. Fireplace TYPES OF SYSTEMS Residential- • Heating • Cooling • Single Zone • Relatively Simple • One Unit TYPES OF SYSTEMS Heating- • Gas • Coal • Oil • Electric • Geothermal • Wood • Heat Pump TYPES OF SYSTEMS Heat Pumps- • Heat pumps extract heat from inside and transfers it outside during the summer • Heat pumps extract heat from the outside during the winter and transfer it inside • Heat pumps contain electric strips to add heat to the intake air in winter TYPES OF SYSTEMS Cooling- • Heat pumps • Condensor TYPES OF SYSTEMS Commercial- • Larger • Greater need for energy efficient structures • More complex • Multiple Zones • Multiple Units Types of Systems Commercial- • Many unducted designs • Small self-contained units sometimes used • Central control can configure different zones for temperature, air mixture, and humidity equilibrium TYPES OF SYSTEMS Fireplace- • Furnace • Hearth and chimney • Wood burning stove Materials Plastic Rubber Urethane Materials Aluminum Copper Steel Symbols - Ducts -Rectangle -Measurements and direction of airflow in middle -Round - Diameter symbol indicates round duct -Square – Square symbol indicates square duct Symbols - Ducts -Drop (D) or Rise (R) with respect to airflow -Flexible Connection – sometimes canvas is used -Insulated Ducts – Interior and exterior Symbols –Vents -Registers – Floor and Wall Symbols - Condensers -Air-Cooled – Fans blow air over tubes containing refrigerant -Coil – Uses a tube coil that contains refrigerant in conjunction with a fan Symbols - Piping -Flexible hoses and connectors - Used in hot water heating -Flow sight glass – Monitor flow and condition of liquid Symbols – Heating and Cooling Symbols - Valves - 3-Way Valve – Either a mixing or diverting valve -Gate Valve – Commonly called a 2-way -Used to throttle or change flow Symbols - Coils -Heating Coil -Heat Recovery Coil -Reheat Coil Symbols – Misc. -Supply Fan – Supplies the air to the entire system -Compressor – Compresses liquids and gases to a smaller volume Full Schematic AIR INTAKE SANITARY VENT Acknowledgements • Lennox Indoor Comfort Systems • ACS, Inc. • http://www.hvacmall.com • http://www.caddons.com • Engineering Design and Communication by Lockhart and Johnson • http://www.google.com • HVAC Systems Design Handbook by Haines and Wilson Questions • Does anyone have any questions?
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