Heating Ventilating and Air Conditioning Civil Engineering and

Heating, Ventilating, and Air Conditioning Civil Engineering and Architecture © 2010 Project Lead The Way, Inc.

TABLE OF CONTENTS • Types of Systems • Central Forced Air System – Air Handling Unit • Hot Water System • Zoned Control System • Radiant Heat • Heat Pump • HVAC Plans

Types of Systems • • Central Forced-Air Systems Hot Water Systems Zone Control Systems Radiant Heat

Central Forced Air System • Most Common HVAC System • Circulates air through or around heating and cooling devices. • A fan forces air into ducts • Supply ducts transport conditioned air into building through diffusers or supply registers • Air is routed back to heating/cooling device through return ducts

Air Handling Unit (AHU) • Device used to condition and circulate air as part of an HVAC system • Large metal box containing a blower, heating or cooling elements, filter, and sound attenuators • Connects to ductwork that distributes the conditioned air through the building and returns it to the AHU Courtesy Eric Fisher

Air Handling Unit (AHU) • May need to supply heating, cooling, or both • A furnace generates heat – Fuel oil or natural gas – Electric heating elements – Heat pump • A refrigeration system absorbs heat – Air conditioner – Heat pump

Air Handling Unit (AHU) • Smaller air handlers may contain a fuel-burning heater or a refrigeration evaporator placed directly in the air stream • Large commercial air handling units contain coils that circulate water – Boiler provides hot water or steam – Chiller provides chilled water ©i. Stockphoto. com

Air Handling Unit (AHU) Typical AHU components: Wikimedia 1. Supply duct 2. Fan compartment 3. Flexible connection 4. Heating and/or cooling coil 5. Filter compartment 6. Return and fresh air duct

Hot Water System • Water heated in boiler and circulated through pipes to radiators • Requires plumbing rather than ductwork ©i. Stockphoto. com

Zone Control System • One heater and one thermostat per room • No ductwork • Often used in hotel rooms

Radiant Heat • Supply heat directly to the floor, wall, or ceiling • Hot water pipes or electric heating element runs through building component • Dependent on radiant heat – Heat transferred from hot surface to people and objects Wikimedia

Heat Pump (HP) • A machine or device that moves heat from one location (the source) to another location (the mechanical work) • Can produce heating or cooling by reversing the direction of heat flow • Can be used in: – Forced Air System – Hot Water System – Radiant Heat System wikimedia

HVAC Plans Image Courtesy Novus Architects

HVAC (Mechanical) Plans Image Courtesy Novus Architects

HVAC Mechanical Plans Image Courtesy Novus Architects

TABLE OF CONTENTS • Types of Systems • Central Forced Air System – Air Handling Unit • Hot Water System • Zoned Control System • Radiant Heat • Heat Pump • HVAC Plans

Image Sources • • • en. wikimedia. org. Images retrieved Dec. 8, 2009. Novus Architecture (formerly SGM Architects), Mt. Pleasant, SC www. istockphoto. com. Images retrieved Dec. 8, 2009.

Heating, Ventilating, and Air-Conditioning