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Mechanical Engineering Department  Temperature Control  Cooling  Heating  Humidity Control  Humidification  Dehumidification  Air Quality Control.

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Presentation on theme: "Mechanical Engineering Department  Temperature Control  Cooling  Heating  Humidity Control  Humidification  Dehumidification  Air Quality Control."— Presentation transcript:

1 Mechanical Engineering Department  Temperature Control  Cooling  Heating  Humidity Control  Humidification  Dehumidification  Air Quality Control  Ventilation  Cleaning HVAC Systems’ Primary Functions

2 Mechanical Engineering Department HVAC Systems –Energy Considerations Typical Energy Use in a Commercial Building

3 Mechanical Engineering Department HVAC Systems Efficient Use of Energy Requirements Optimum Energy Designs Well-Developed Energy Use Policies Dedicated Management backed up by Properly Trained and Motivated Operating Staff

4 Mechanical Engineering Department HVAC Systems Minimum Guidelines in Energy Conservation, Design and Operation ASHRAE Standard 100, “Energy Conservation in Existing Buildings” ASHRAE Standard , “Energy Efficient Design of New Buildings Except Low-Rise Residential Buildings”

5 Mechanical Engineering Department HVAC Systems Typical Building Design Heat Losses or Gains

6 Mechanical Engineering Department HVAC Systems Some Relevant Energy/Emissions Statistics Emissions related to building energy use account for: 35% of CO 2 emissions 47 % of SO 2 emissions 22% of NO x emissions Buildings account for: 36% of all the energy 66 % of all the electricity used in the US

7 Mechanical Engineering Department HVAC Systems Annual Energy Use Per Unit Floor Area

8 Mechanical Engineering Department HVAC Systems Capital Cost Estimating Factors

9 Mechanical Engineering Department Schematic of a Typical Commercial Air-Conditioning System HVAC Systems

10 Mechanical Engineering Department Elementary Air Temperature Control System HVAC Systems

11 Mechanical Engineering Department Air Handler and Associated Controls for Simple Constant-Volume, Single-Duct All-Air System HVAC Systems

12 Mechanical Engineering Department Schematic of a Blow-Through Air Handler With Hot and Cold Decks and Zone Dampers HVAC Systems

13 Mechanical Engineering Department Simplified Control Schematic for a Constant-Volume reheat System HVAC Systems

14 Mechanical Engineering Department Simplified Control Schematic of a Single-Duct VAV System HVAC Systems

15 Mechanical Engineering Department Simplified Control Schematic of a Dual-Duct System HVAC Systems

16 Mechanical Engineering Department HVAC Systems Multi-Zone System With Hot and Cold Plenum Reset

17 Mechanical Engineering Department HVAC Systems Air-Water Induction Unit From Central A/C Unit Hot or Chilled Water Typically installed at perimeter wall under window or overhead

18 Mechanical Engineering Department HVAC Systems Typical Fan-Coil Unit Chilled Water or Brine/ Hot Water or Steam or Electric Heater Air-Conditioned Air Recycles Room Air, Cheapest Perimeter System, Ventilation Provided Separately

19 Mechanical Engineering Department HVAC Systems Typical Air-Conditioning Ventilator with Separate Coils

20 Mechanical Engineering Department HVAC Systems Schematic View of a Room Air-Conditioner


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