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JOB: University of Central Arkansas Central Plant System
ENGINEER: Tinsley-Mullen Engineers, Inc.
DISTRIBUTOR: Roberson & Call, Inc.
LOCATION: Conway, Arkansas
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SYSTEM INFORMATION: The University of Central Arkansas pumping system contains three separate packaged systems all mounted on one 11' 2" wide by 30' long structural steel base. The Hot Water, Condenser Water and Chilled Water systems were fully piped, wired, hydrostatically and flow tested prior to shipment. The controls for the entire system match the Building Management System which allows for:
- Direct communications between the Packaged Pumping System and the Building Management System
- Simpler system maintenance
- Less training for campus staff
CHW SYSTEM INFORMATION:
The Variable Speed Primary Chilled Water System consists of two 100 HP 2100 GPM pumps. Under normal operation, the variable speed primary pump is controlled via differential pressure sensors and a flow sensor to maintain the chilled water supply in the campus district loop. When there are low demand conditions in the district loop a modulating bypass valve in the mechanical room is controlled to maintain minimum flow through the chiller. The expansion to the district cooling system also includes a secondary chilled water pump which is used to boost the pressure for a set of new buildings located next to the new Central Plant. In case of a primary pump failure, a differential pressure switch across the pump indicates that the pump is not working properly. The primary pump will signal a failure condition to the Building Management System so that the secondary booster pump can be valved to act as the primary. The 100 Hp Variable Frequency Drives are also equipped with a full-speed electrical bypass per drive.
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 CW SYSTEM INFORMATION: The constant speed condenser water system has two 100% pumps designed to deliver 1400 gpm with a differential pressure of 59 ft. The Canariis System receives a signal from the Building Management System to a matching controller on our system that initiates a pump to run. In case of failure, a differential pressure switch across the pump indicates that the pump is not working properly and the stand-by pump is started.
 HW SYSTEM INFORMATION: The Variable Speed Hot Water System has two 50% pumps designed for 130 gpm each with a differential pressure of 129ft. The speed of the pumps are controlled by differential pressure sensors and a flow sensor. In case of failure, a differential pressure switch across the pump indicates that the pump is not working properly and the second pump is started. The 10 Hp Variable Frequency Drives are also equipped with a full-speed electrical bypass per drive.
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