Mexico. An air conditioning project with ice water systems was installed at the Center for Technical and Higher Education (CETYS University), which is an educational institution, located in the state of Baja California, Mexico.
The firm Aire Servicio, with the participation of the company Aquisistemas as supplier and selector of the Armstrong brand equipment, were the protagonists of the project that required designing a variable pumping system, capable of adapting to changes in demand according to occupation, and in the future comply with the ASHRAE 90.1 standard to apply for a LEED certification.
To supply the total square footage of the campus along with its expansion, 2,000 tons of air conditioning were needed. Which will be installed in stages, according to the projection of the campus.
Focused on the pumping area, they were projected in the secondary circuit: 2 Vertical in-line pumps 4300 Design Envelope (60 HP) / Model 0610-060.0 Each pump was selected to handle 1000gpm @ 178 ft, with premium efficiency inverter duty motor, factory installed and programmed frequency inverter, with Design Envelope IVS Sensorless technology, suction diffuser and triple use valve.
In the Primary circuit: 2 Vertical in-line pumps 4300 / Model 8x8x10 (30HP) Each pump was selected to handle: 1400gpm @ 62 ft, with premium efficiency inverter ready motor, suction diffuser and triple use valve.
As for the results: power consumption: Before (Constant): 56.05 hp (41.76Kw) full load. Now (Variable): 57.16 hp (42.65Kw) full load, 14.29 hp (10.65Kw) @ 50% of demand.
The results of the project showed a return on investment of less than 1.5 years. Projected 10-year savings of US$86,790 per pump (present value) in electrical energy. Design Envelope IVS provides LEED points.
