Nissan North America: Air Handling Units Control Upgrade Delivers Massive Energy Savings

Background

Nissan’s Canton, Mississippi plant is one of four of the company’s manufacturing facilities in the United States. Opened in 2003, the Canton plant is a 4.5 million square foot plant that can produce up to 410,000 vehicles annually. After completing a chilled water optimization project, Nissan’s energy team shifted their focus to the plant’s air handling units (AHUs), which rely on operator inputs to circulate air to different parts of the plant. In 2019, Nissan evaluated an AHU upgrade that included automated controls to manage airflow without ongoing plant operator management. To test out the solution, six AHUs were upgraded with the new controls and significant energy reductions were realized. Nissan approved additional funding for the project and expanded the scope to upgrade the remaining AHUs with new controls at the Canton plant. The project has been a tremendous success, saving over 4.8 million kilowatt-hours (kWh) annually.

During the initial 2019 AHU study, Nissan partnered with a third-party controls vendor to implement the upgrade on six AHUs. Nissan evaluated the effectiveness of the upgrade by monitoring the energy usage for two days after implementation. Then, they turned off the controls system for another two days to compare the difference in energy usage. The difference in AHU system load was measured to be 24 kilowatts (kW) per AHU. Based on the success of the project, the Canton plant upgraded 35 additional AHUs with the new controls.

Solutions

After proving out the controls solution with six AHUs, Nissan funded a project to upgrade 35 more AHUs throughout the trim shop area of the plant. The 35 AHUs deliver over 2.1 million cubic feet per minute of conditioned air to maintain temperature, humidity, and air quality. The controls system will lower the speed of the AHU motors once set points are met. This enables the temperature and humidity to be maintained while running the motors at a lower kilowatt (kW) load. Additionally, the controls include CO2 sensors to monitor air quality and adjust outdoor air ventilation accordingly. If the air quality is low based on higher CO2 levels, the dampers modulate open to bring in more outside air.

The AHU controls upgrade lowered the power demand of the 35 AHUs resulting in 480 kW of total load shed. The project is estimated to reduce the energy usage of the plant by over 4.8 million kWh or the equivalent of 1,800 metric tons of CO2emissions. The success of the project has led Nissan to invest in 30 additional AHU upgrades at the Canton plant. By the end of 2021, the 30 AHU controls will be upgraded, and the company anticipates additional savings of 4.1 million kWh annually and over 1,500 metric tons of CO2.

ANNUAL ENERGY USE

ANNUAL ENERGY COST

ANNUAL WATER USE

ANNUAL WATER COST

ANNUAL PLANT ELECTRICITY USE

ANNUAL PLANT ELECTRICITY COST

IN BUILDING ENERGY USE

IN BUILDING ENERGY COST

ACROSS NETWORK USE

ACROSS NETWORK COST

ANNUAL EMISSIONS

USE

COST

ANNUAL WASTE COST

ANNUAL WASTE USE

Nissan North America: Air Handling Units Control Upgrade Delivers Massive Energy Savings

Related Content