HVAC 101. The Basics of Heating, Ventilation and Air Conditioning
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1 HVAC 101 The Basics of Heating, Ventilation and Air Conditioning
2 HVAC Heating, Ventilation and Air Conditioning Provides comfort for people Allows humans to exist under adverse conditions.
3 Comfort Comfort is primary intent of HVAC systems. Productivity Building Durability Health Mold
4 Load Calculations Heating and Cooling Accuracy important! Design conditions Building shell load R, U value Internal load Ventilation load Infiltration Occupancy schedules
5 Heat Transfer Conduction Convection Radiation Resistance (R-Value) U = 1 / R Q = U x A x T U-Value is the rate of heat flow in Btu/h through a one ft 2 area when one side is 1 o F warmer
6 Solar Heat Gain Coefficient The amount of solar heat energy allowed to pass through a window Example: SHGC = 0.40 Allows 40% through and turns 60% away
7 Psychrometrics Dry bulb temp. Wet bulb temp. Humidity Dew point Moisture content Heating Cooling Humidify De-Humidify Psychrometric Chart
8 Basic Refrigeration Cycle Condenser Compressor Expansion Valve Evaporator
9 Basic HVAC Equipment Fans / Blowers Furnace / Heating unit Filters Compressor Condensing units Evaporator (cooling coil) Control System Air Distribution System
10
11 System Types and Common Terms Packaged Rooftop Unit Split System Heat Pump Geothermal Air to Air Hydronic (water) PTAC / PTHP Constant Volume Variable Volume Indoor Air Quality Direct Expansion
12 Packaged Rooftop Units
13 Split System Ductwork Heating and Cooling Equipment A/C UNIT FURNACE Temperature & Humidity Controls
14 Heat Pump Operate on simple refrigeration cycle Reversing the cycle provides heating Temperature limitations Air to air Water source Geothermal Lake coupled
15 Geothermal Heat Pump Systems
16 Variable Air Volume Variable Speed Supply Fan Supply Ducts Return Air Filters Cool Coil w/temp Reset Heat Coil w/temp Reset VAV Box Reheat Coil T T Zone Thermostat Variable Speed Return Fan Return Ducts HVAC-16
17 Terminal Units Variable volume: Parallel Constant volume: Series
18 Hydronic systems Pumps Piping Valves
19 Control Devices Thermostats Manual Programmable Optimum Start DDC Systems Variable Speed Drives Automatic Valves and Dampers Outdoor Sensors
20 Major Equipment Chillers Boilers Cooling Towers
21 Economizers Air Side Water Side
22 Economizers Free cooling source: When available, use cool outdoor air instead of mechanically cooled air. Minimum supply of outside air 80 o F 55 o F 85% outside air 85% exhaust 55 o F and up 80 o F 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 HVAC-22
23 Zoning and Economizers Economizers provide free cooling when outdoor conditions are optimal Proper orientation & zoning yields comfort & efficiency N W Core S E HVAC-23
24 Air Distribution Ductwork Metal Flexible Ductboard Grilles, Louvers, & Registers Dampers Shut off Fire Smoke Sealants Supports
25 Return Plenum Problems HVAC-25
26 Additional Equipment Energy Recovery Units Desiccant Systems
27 Additional Equipment Heat Exchangers Humidifiers Silencers
28 Mechanical Dehumidification Return air is mixed with ventilation air Cold coil condenses moisture Heat is added back (electric or gas) so that room air is not over cooled- Reheat Filter
29 Historical Minimum Ventilation Rates (cfm/person) Smoking Nightengale 1865 Tredgold 1836 Billings 1895 Flugge 1905 Yaglou 1938 Smoking ASHRAE ASH- RAE ASHRAE
30 Improved Ventilation Effectiveness Mechanically provide filtered and dehumidified outdoor air to the breathing space Vary ventilation based on the number of occupants and process loads - changes in occupancy can be measured by CO 2 sensors Consider designs that separate ventilation and space conditioning Utilize heat recovery systems to reduce system size and ventilation energy costs
31 Improved Ventilation Effectiveness Effective mixing of ventilation air within space Net positive pressure in the southeast; exhaust from appropriate spaces Provide clean outdoor air, avoid: loading docks exhaust vents plumbing stacks waste collection stagnant water
32 Additional Information / Resources ASHRAE The American Society of Heating, Refrigerating and Air-Conditioning Engineers Geothermal heat pump consortium
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