; NIST DESIGNS EFFICIENT ROOFTOP AIR-CONDITIONING SYSTEM
Played out on a computer
over hundreds of generations, a survival-of-the-fit-test programming method
adapted by National
Institute of Standards
and Technology (NIST)
researchers has spawned
the design for a more
efficient rooftop air-conditioning system. The evolutionary tack optimized
the sequence of connections within the snaking arrangement of
cooling tubes in the air conditioner’s heat exchanger. The unit’s
U.S. manufacturer subsequently implemented the changes as a
prototype for NIST.
“What we’re doing is identifying the best possible route
through the heat exchanger for the refrigerant to follow
so that it achieves the highest efficiency,” explains NIST
researcher David Yashar. “Given that the unit we studied has
144 tubes, the number of possible routes determined by a
sequence of tube connections is astronomical, impossible for
a human to explore using traditional methods.”
The new NIST approach optimizes the connections among
refrigerant-containing tubes so that maximum cooling occurs.
This entails matching characteristics of incoming air, especially its
temperature and velocity, with the temperature and other charac-
teristics of the refrigerant. After the number-crunching for several
hundred generations of circuitry options was completed, a top
choice emerged. The ultimate solution was a circuitry design that
increased the heat exchanger’s potential cooling capacity by 8%
and, when used to replace the existing design, boosted the entire
system’s energy efficiency by 3%.
; ENDICOTT COLLEGE OPENS NEW BUSINESS AND SCIENCE
Endicott College, Beverly, Mass., will begin its academic year
with a new 67,000-sf building headlining several large-scale
campus improvement projects. The $19 million School of Business and Science Center boasts a high-ceilinged atrium with a
grand foyer overlooking the Endicott lakes, a 160-seat lecture
hall and a multi-use environment to stimulate faculty and student research and group project collaboration. Dedicated space
for the Center for Entrepreneurship and computer science will
be located in the business wing. Science and biotechnology will
be located in a separate wing with classrooms for biology and
microbiology, cell-molecular biology, anatomy and physiology,
chemistry/biochemistry, physical sciences and environmental
sciences, as well as dry and wet labs, prep rooms, workrooms,
a small robotics lab and general research labs. A STEM incubator lab will be created to stimulate startup biotech business
ventures and collaborate with the Center for Entrepreneurship.
As part of Endicott’s efforts to reduce environmental impact,
construction has begun on a solar canopy above a new parking
lot. It will be one of the largest installations of its kind in the
Northeast and will reduce regional carbon dioxide emissions by
about 400 tons per year.
continued on page 20
The new NIST approach optimizes the connections among refrigerant-containing tubes
so that maximum cooling occurs.
makes a difference
Experts in Vacuum for Science
Toll Free 888-882-6730
The absolute vacuum needed for lab vacuum
applications differs greatly from lab to lab,
job to job…even place to place.
; t; Did you know that chemistry labs
routinely need vacuum 100 to 10,000
times deeper than tissue culture labs?
; t; Do you know what vacuum depth a lab
needs for filtration? How about for
; t; Did you know that site elevation can
affect the vacuum specification?
VACUUBRAND has specialized in vacuum
for science for 50 years. Our innovations include energy-saving variable speed vacuum
systems; modular in-lab vacuum networks
that replace central systems; and waste-vapor
capture features that support sustainability
When you need to specify vacuum for
your next project, consult the experts.
It will absolutely make a difference.