NXP Semiconductors

Overview

Headquartered in Eindhoven, Netherlands, NXP Semiconductors is a global manufacturer of wafers for microprocessors and microcontrollers. Southland assisted with various engineering studies within the Chandler, Arizona, campus which feature multiple fabrication and central utility plants. NXP engaged Southland for the project due to a lack of facilities engineering manpower at the site.

Approach 

Two of the campus’ buildings utilized clean steam for humidification purposes. Southland provided an adiabatic humidification study for the building’s air handling units. Each building was studied with a 25 percent, 50 percent, 75 percent, and 100 percent humidification load shift option. The study revealed that the existing steam humidification capacity was for the most extreme outdoor conditions. Southland was able to calculate energy savings and estimated installation costs to explain that given typical outdoor air humidity levels, the 25 percent load shift would provide the best payback option.

Result

The Chandler campus utilizes three centralized cooling loops located in two central utility buildings. Southland focused on optimizing the glycol chilled water (GCHW) loop and chilled water (CHW) plants located within the central utility plant building. The analysis demonstrated the optimization of the GCHW and CHW system, along with a shutdown of the plate and frame heat exchanger, would yield an annual saving of approximately $33,000. 

To create the savings, Southland proved that the chilled water system could operate at as low as 40 degrees Fahrenheit and act as the primary source of make-up air cooling and dehumidification. Additionally, the plate and frame load shed heat exchanger provided a false load on the GCHW plant and could be isolated to minimize the load.

Additional studies for the Chandler campus demonstrated an extra annual savings of $45,000, as well as the opportunity to utilize a water reclamation system to consume excess water without installing additional equipment. 

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