On many projects, the owners wish to
proceed on a design-build basis due to time constraints. We act as the owners
representative, to assist them in obtaining the best HVAC system in the shortest possible
time frame.
In this
role, our work is very similar to that associated with the Mechanical Systems Architect
role, but we are developing a criteria bid package for design-build contractors to work
from, rather than working with another Engineering firm.
We are
typically retained directly by the owner to eliminate any potential conflicts between the
do it right desires of the owner and the do it cheaper mentality
of the typical Design-Build Contractor.
We perform
preliminary engineering on the project, determining the proper refrigeration equipment
sizes and selections, design the hydraulic configuration, size the piping systems, select
the proper air distribution equipment, and develop other performance based criteria
for the design-build contracting team to follow.
We
typically fully engineer the DDC control system, including very detailed control system
sequences of operation that can span 40 to 100 pages for a typical facility and chiller
plant. We find that the easiest way for a design-build contractor to get
low at bid time is to scrimp heavily on the control system. By completely
designing the controls to meet the needs of the owners and being very specific about our
desires and the design intent, we are far more likely to obtain an overall system that
meets the owners expectations.
After the
front end engineering work has been completed, we can assemble a bid package, including
top level plans and specifications. We work with the owner to select qualified bidders,
and can then review the bids, assist the owner in selecting the most responsive bidder,
review the equipment and shop drawing submittals for conformance with the design intent.
To maximize lifecycle savings, we prefer to carry our work through the Commissioning and
Operator Training phases. |