Before, we have never been able to meet our goal temperature during the summer months with this freezer.

Case Study

St. Louis Zoo

For over 100 years the St. Louis Zoo has been a part of the landscape of St. Louis. The zoo is recognized worldwide for its innovative approaches to animal care and management, wildlife conservation, research, and education, the zoo attracts millions of visitors each year. And, entertaining millions of guests means providing tons of food and refreshments year-round.

Problems to Solve

Could not maintain temperature.

Needed to monitor system operation.

Solution Provided


KE2 Evaporator Efficiency &

Results Obtained

Desired Temperature was met under all conditions. ✓

Remote Access is provided via KE2 SmartAccess for 24/7 visibility. ✓ 

Reduce defrost cycles by 80% resulting in energy savings. ✓ 

The food service hub for the zoo is the main food distribution center. The distribution center houses a 30’x 40’x 14’ freezer consisting of two systems, each with one condensing unit and two separate evaporators.

The system was challenged to maintain the -10°F setpoint, struggling even during the winter months. Additionally, according to Patrick Williamson, Director, Purchasing & Distribution,

“We need to have the ability to view our refrigeration systems.”

When Williamson’s local refrigeration wholesaler approached him with the KE2 Evaporator Efficiency (KE2 Evap) controller, he saw a natural fit for his application. The monitoring capability not only satisfied his need but thanks to the KE2 Evap’s ability to provide real-time data, service technician Ken Hunter was also able to identify system problems that needed to be addressed.

Once the issues were resolved, the system began running much more efficiently and was reaching the setpoint. Williamson commented,

“Before, we have never been able to meet our goal temperature during the summer months with this freezer.”

Additionally, the improved monitoring exceeded Williamson’s previous capability, eliminating the need to manually record the temperature data. Another noteworthy benefit of the KE2 Evap installation is that reducing defrost cycles by 80% not only saves considerable energy, but it also reduces stress on the refrigeration equipment. Hunter is enthusiastic about the KE2 Evap and sees its potential application throughout the zoo. Stated Hunter,

“I really like the controller and have many more places we will be using these.”

Weekly Snaphots

BEFORE: Using standard time clock – 15 defrosts in 5 days.

AFTER: (shown below) KE2 Therm Evaporator Efficiency Controller – 3 defrosts in 5 days.