111130 selecting roof top units rdb
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Transcript of 111130 selecting roof top units rdb
Sharing our Guidance
Selecting Roof Top Units
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Selecting Rooftop Units
To optimize HVAC equipment to provide consistent occupant comfort, while
maximizing efficiency to conserve energy and contain costs.
The Challenge
Optimize HVAC
EquipmentProvide
Consistent
Occupant
Comfort
Conserve Energy
Contain Costs
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Selecting Roof Top Units
A single, packaged piece of equipment that provides basic HVAC functions, such as: Air moving Outside air induction Filtration, conditioning, heating, and cooling of the air supplied to the space
What is a Roof Top Unit (RTU)?
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Selecting Roof Top Units
Complete systems
Supply air fans
Filtration systems
Factory wiring with electrical connections
Factory tested for performance
What do RTUs Include when Delivered?
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Selecting Roof Top Units
Roof Top Unit Size: Small Units
Genera l ly
l imited in
opt ions
ava i lab le .
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Selecting Roof Top Units
Roof Top Unit Size: Large Units
Often
off ered with
component
sect ionsComponents
can be
mixed and
matched
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Selecting Roof Top Units
Summer cooling loads are the main
determinant factor.
The heating loads are usually dealt
with according to the size of the unit.
System Performance Requirements
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Selecting Roof Top Units
Interior Load – Calculated using the outside temperature plus solar heat gain
acquired due to heat transfer through the fabric of the building.
Outside Air Temperature – Will, in part, determine the cooling load of the
outside air brought into the building for ventilation.
Effectiveness of the Refrigeration System – If the refrigeration system is air
cooled, the outside temperature will influence the effectiveness of the
refrigeration system.
Effects of Outside Summer Design Temperature
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Selecting Roof Top Units
Initial cost to purchase and install vs.
the ongoing cost of operation and
maintenance.
Load vs. capacity
Deciding Factors When Choosing RTUs
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Selecting Roof Top Units
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Selecting Roof Top Units