Ultra Low Charge NH3 Packaged Refrigeration Technology Field Optimization

To demonstrate and assess improved energy efficiency with continuous performance monitoring, flexible demand response and certified ADR capabilities for both low and high temp refrigeration. Project will utilize an ultra-low charge, zero GWP, flexible tonnage packaged system, continuous monitoring and advanced control strategies to enable Flexible DR Unit is more energy efficient than incumbent technology. Provide ongoing comprehensive real-time monitoring of all metrics to build a calibrated calculation tool to support further market adoption and/or program. Besides EE, there is an opportunity for Flexible Demand Response in various refrigeration control applications and this project will determine the best site control strategies to demonstrate DR. It is expected to achieve least 20% demand reduction by taking advantage of built-in inherent storage capabilities based on the thermal mass of frozen or refrigerated food—that allows to temporarily shed, shift or adjustment in power demand, key enablers for fast and flexible demand response. Additionally electric defrost control can also help add load to ameliorate renewable grid effects. Demonstrate and report on air quality and any water savings benefits achievable from use of the technology. This technology can replace all GWP and ODP refrigerants with an energy efficient and DR ready

Executive Summary This report covers findings from an assessment completed in the fall of 2019, and describes the results of activity focused on refrigeration Roof Top Units (RTUs) installed at the two locations. The RTUs were originally installed at two new-construction refrigerated warehouse locations: • KPAC General Cold Storage (GCS), completed in December 2017 and owned by KPAC Cold Storage in South Gate. • Lineage Logistics, which completed its first full year of operations in 2017 and was owned by Baker Commodities in Long Beach. At the GCS site, which had a total of eight units (six operational, two non-functional) we evaluated the operational units to determine actual kilowatt per ton (kW/ton) performance and cooling capacity as installed. The key focus was to determine the British Thermal Unit per kW (BTU/kW) and kW/ton performance ranges the technology could deliver. The Long Beach facility had a total of 46 RTUs, from which three were selected to optimize refrigeration temperature performance only. The effort was to re-commission the units to maintain space temperature. SCE consulted with the customer to select the units based on their observation that they were not delivering the expected full-design refrigeration temperature benefit. They could not maintain the design temperatures, which then caused issues with frozen products. Objectives The objectives of this project were to: • Assess and optimize the operational performance of three specific, selected packaged refrigeration ultra low-charge NH3 RTUs at the Long Beach site. o The main focus was temperature optimization. • Report on demand and capacity for the operating units located at GCS. o There were no planned equipment changes or optimization tasks planned at this location. • If feasible, demonstrate flexible Demand Response (DR) capabilities.1 Based on the pre- and post-project comparison of the three modified RTUs serving freezer space at the Long Beach location, the project delivered the site operator’s desired results in terms of improved room temperature performance, with the average freezer room temperature reduced by almost 14°F from the baseline condition, and, importantly, a better overall ability to provide colder temperatures to the space. For Automated DR (Auto-DR) considerations, the installed control system had many limitations (summarized below) including a lack of capability for automated central programing or data analysis, which prevented Auto-DR or other optimization. No technology enhancements were planned for the GCS location. The air- and water-side unit capacity and performance assessment was performed at the operating facility; in summary, the kW/ton cooling ranged from 0.93 kW/ton to 1.51 kW/ton, and cooling capacity ranged from 9 to 75 tons. We found the same control system limitations as in Long Beach at this location.   Refer to the final report for detail information about the project including summary, findings, conclusion and recommendations.