Chiller Conversion
- Replaced three of the six chillers
- Installed a state-of-the-art ATC system
- Enhanced indoor air quality by utilizing outside air
A 40-year old seven-story office building in Cherry Hill, NJ received a long overdue HVAC overhaul which will result in significant energy savings as well as more efficient and quicker temperature response time.
When new
owners bought the “1040 Building,” they hired Ray Doney, A. A. Duckett sales
engineer, to evaluate the existing systems. Doney
discovered that while the air conditioning tonnage was adequate, three of the
existing six chillers needed to be replaced and the cooling capacity -- though
sufficient for the building’s size -- realized a significant energy loss in the
condensers’ cooling and air distribution. He also found that the indoor air
quality was degrading because the ATC system didn’t draw on outside air, except
for economizing during the winter months.
New larger capacity boilers were installed to allow for additional outside air use to precipitate better indoor air quality. Ray Doney designed a state-of-the-art system involving the installation of ATCs, sensitive thermostats in each room of the top floor, water reservoirs and many other energy-saving features. The boiler was replaced with a six million BTU, copper fin tube model with a three-way valve and hot water reset controls to utilize more outside air year round.
For
optimum performance, all seven floors were outfitted with baseboard perimeter
zone ambient heat as well as overhead heating ducts. Two DX air handling units
– one on each side of the building – cranked all six chillers to full capacity
to cool their respective halves of the structure, instead of evaluating the
cooling needs and putting to work only those chillers necessary for the job.
The cold deck of each air handler consists of one 80-ton and two 60-ton
condensers plus two Flat Plate heat exchangers for each side.
Three new 60-ton Carrier chillers replaced aging models and a 500-gallon cold water storage tank was installed near each air handling unit along with three chilled water pumps: one for each side and the third as a backup if the main pumps fail. The chillers are organized so that the minimum amount of “chilling” is used for each “cold” request.
The
Duckett team enlisted the help of Elliott-Lewis Corporation's Mike Law,
ATC
Specialist, to design and install the t.a.c.’s ATC system. This allows
room-by-room hot-cold control with response time reduced from over 15 to fewer
than five minutes. Hot and cold spots are virtually eliminated. Conference
rooms in the middle of the building are as comfortable as the once
always-chilly corner, windowed office on the shady side of the complex.
A. A. Duckett project manager Jim Woolslayer was responsible for organizing the replacements and tackling the logistics along with installers Bob Bendzyn and Bill Linneman.
The tenants are comfortable and the energy and dollar savings will be significant.
