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HVAC

HVAC. Heating, Ventilation and Air Conditioning -something that you never think about until it doesn’t work properly. Why I don’t care…. Won’t some one else take care of it? I’ll hire some one. The engineers are weird. I don’t have a mind for that stuff. Questionnaire.

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HVAC

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  1. HVAC Heating, Ventilation and Air Conditioning -something that you never think about until it doesn’t work properly

  2. Why I don’t care… • Won’t some one else take care of it? • I’ll hire some one. • The engineers are weird. • I don’t have a mind for that stuff.

  3. Questionnaire • Q: Why do we control temperature? • A: Comfort of guests/employees • Q: What temperature is comfortable? • A: It all depends… • Q: How does humidity play a role in temperature? • A: relationship between temp and humidity (evaporation)

  4. HVAC – What does it do? • Comfort • primary intent of HVAC systems. • Building Durability • moisture • Health • air exchange • Mold

  5. Basic HVAC Equipment • Fans / Blowers • Furnace / Heating unit • Filters • Compressor • Condensing units • Evaporator (cooling coil) • Control System • Air Distribution System

  6. HVAC System (simplified) Ductwork Heating and Cooling Equipment FURNACE Temperature & Humidity Controls A/C UNIT

  7. System Types and Common Terms • Packaged Rooftop Unit • Split System • Heat Pump • Geothermal • Hydronic (water)

  8. Packaged Rooftop Units

  9. Control Devices • Thermostats • Manual • Programmable

  10. Heat Pump • Operate on simple refrigeration cycle • Reversing the cycle provides heating

  11. Economizers Free cooling source: When available, use cool outdoor air instead of mechanically cooled air. Minimum supply of outside air 55 oF and up 55 oF 85% outside air 85% exhaust 80 oF 80 oF Normal Operation Outside air dampers are positioned to provide the minimum outside air Economizer Operation Outside air dampers are fully open. Maximum outside air is provided

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