Design Criteria For Heating & Cooling Systems Flashcards
Minimize first cost of the heating and cooling system
Simplest possible all air systems
- SINGLE DUCT, CONSTANT AIR VOLUME
System with no ductwork or piping
-THRU WALL AND PACKAGED TERMINAL UNITS (PTU)
If you wish to minimize operating cost and energy consumption
System that converts fuel to heating and cooling energy with max efficiency
- VARIABLE AIR VOLUME (VAV)
SINGLE DUCTS, CONSTANT AIR VOLUME (SD CAV)
HYDRONIC CONVECTORS (HC)
System that uses ambient heat from surrounding environment
- CLOSED LOOP HEAT PUMP SYSTEM
Med-small buildings - passive systems
-PASSIVE SOLAR HEATING (PSH)
NATURAL VENTILATION COOLING (NVC)
THERMAL MASS COOLING (TMC)
EVAPORATIVE COOLING (EC)
If you wish to maximize control of the air quality and velocity
All air- heating systems:
-VAV
VAV Reheat
VAV Induction
Dual-Duct VAV
CD CAV
CAV Reheat
Multizone
Maximize individual control over temperature in a number of rooms or zones
System that react separately to # of thermostats
- VAV
VAV Reheat
VAV Induction
DD VAV
CAV Reheat
MZ
Air-water induction
Fan-coil terminals
Thru wall and packaged terminal units (PTU)
Minimize system noise
System that operates at low air velocities and whose parts are distant from the occupied space
-ANY ALL AIR SYSTEM (Not induction systems)
HYDRONIC CONVECTORS (HC)
PASSIVE SYSTEMS
-PSH
NVC
TMC
EC
Minimize the visual obtrusiveness of the heating and cooling system
System with minimal hardware in the occupied spaces of the building
-ALL AIR SYSTEMS
PASSIVE SYSTEMS
-PSH
NVC
TMC
EC
Maximize the flexibility of rental space and adaptability of the heating and cooling system to space configuration over time
Central air system that has minimal hardware in the occupied spaces of the building and that can provide local or zoned control over temperature such as;
- VAV
VAV Reheat
MZ
ALL WATER SYSTEM allows easy temp control of the individual spaces
- FAN COIL TERMINALS
THRU WALL AND PTU
Minimize the floor spaces used for the mech system or the floor-to-floor height of the building
Local system that has NO ductwork or piping
-THRU WALL & PTU
System that minimizes size of ductwork or piping
-INDUCTION SYSTEMS
HYDRONIC CONVECTORS
Passive systems
-PSH
NVC
TMC
EC
Minimize maintenance requirements of the heating and cooling system
Simple system with few moving part
-VAV
SD CAV
HC
Passive system
- PSH
NVC
TMC
EC
Avoid having a chimney in the building
Electrical systems
-ANY SYSTEM WITH ELECTRONIC BOILER
THRU WALL PTU
Passive system
PSH
Maximize the speed of the construction
System that can be installed by a single trade
- THRU WALL & PTU
VARIABLE AIR VOLUME (VAV)
Min. Operating costs & energy consumption
Max control of air velocity and quality
Max individual control over temp
Min noise
Min visual
Max flexibility of rental space
Min system maintenance
No chimney (with an electric boiler)
VAV Reheat
Max control of air velocity and quality
Max ind control over temperature
Min noise
Min visual
Max flexibility of rental space
No chimney (with an electric boiler)
VAV Induction
Less frequently used for
Max control of air velocity and quality
Max ind control over temperature
Min visual
Min floor space used for heating and cooling systems
Min floor to floor height
No chimney (with electric boiler)
Dual-Duct VAV
Less frequently used for
Max air velocity and quality
Max ind control over temp
Min noise
Min visual
No chimney (with electric boiler)
