Transcript HVAC 101 - Johnson & Wales University

HVAC
Heating, Ventilation
and Air Conditioning
-something that you
never think about until it
doesn’t work properly
Why I don’t care…
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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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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?
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Comfort
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Building Durability
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primary intent of HVAC systems.
moisture
Health
–
air exchange
–
Mold
Basic HVAC Equipment
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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
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Packaged Rooftop
Unit
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Split System
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Heat Pump
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Geothermal
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Hydronic (water)
Packaged Rooftop Units
Control Devices
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Thermostats
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Manual
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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
of outside air
55 oF
80
oF
Normal Operation
Outside air dampers are
positioned to provide the
minimum outside air
55 oF and
up
85%
outside
air
85%
exhaust
Economizer Operation
Outside air dampers are fully
open. Maximum outside air is
provided
80 oF