HVAC 101 by pengxuezhi

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									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

   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)
HVAC – What does it do?

   Comfort
    –   primary intent of HVAC systems.
   Building Durability
    –   moisture
   Health
    –   air exchange
    –   Mold
Basic HVAC Equipment

   Fans / Blowers
   Furnace / Heating unit
   Filters
   Compressor
   Condensing units
   Evaporator (cooling coil)
   Control System
   Air Distribution System
 HVAC System (simplified)
                        Ductwork



Heating
and Cooling
Equipment

              FURNACE

A/C UNIT
                         Temperature &
                         Humidity Controls
System Types and Common Terms


      Packaged Rooftop
       Unit
      Split System
      Heat Pump
      Geothermal
      Hydronic (water)
Packaged Rooftop Units
Control Devices

   Thermostats
    –   Manual
    –   Programmable
Heat Pump

• Operate on simple
  refrigeration cycle
• Reversing the cycle
  provides heating
                       Economizers
Free cooling source:
When available, use cool outdoor air instead of mechanically cooled air.


Minimum supply                                              55 oF and
of outside air                                              up
                         55 oF   85%
                                 outside
                                 air
                                 85%
                    80   oF      exhaust                           80 oF


  Normal Operation                 Economizer Operation
  Outside air dampers are          Outside air dampers are fully
  positioned to provide the        open. Maximum outside air is
  minimum outside air              provided

								
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