August 8, 2019 11 am CDT
Register at https://www.serdp-estcp.org/Tools-and-Training/Webinar-Series/08-08-2019
“Energy and Water Efficiency Improvements for Dishrooms in Military Dining Facilities” by Dr. Frank Johnson
Energy and water usage for commercial food service have a significant impact on the overall usage of a facility. Daily meal preparation and cleanup in a military dining facility (DFAC) represents more than 75% of the energy and water load. Within the food service facility itself, the dishwashing room or “dishroom” has the highest energy intensity compared to the other zones within a DFAC. This project identified and demonstrated dish machine with waste water heat recovery to reduce the energy and water usage and intensity within a dishroom used for cleaning and sanitizing flatware, dishes, cooking vessels and other food service-related utensils at a military installation. Results showed a savings of 35 therms per day of natural gas and 6,375 gallons of water per day when replacing the existing machine with an energy efficient design. These savings equate to 12,775 therms and 2.33 million gallons of water per year.
“Hygroscopic Cooling Tower for Reduced Heating, Ventilation, and Air Cooling Water Consumption” by Dr. Christopher Martin
This project is evaluating technology for water use reduction at Department of Defense (DoD) facilities that use cooling towers for building comfort control, cold storage and data center cooling. Since they approach the ambient wet bulb temperature, cooling towers allow chillers and other equipment to maintain operating efficiency, even during periods with a high dry bulb temperature. However, cooling towers are intense consumers of water and are a key target for water conservation improvements. Hygroscopic cooling is an advanced cooling tower concept intended to optimize water use without significant degradation of cooling performance. With this system, 100% of the makeup water is evaporated for cooling; no water is wasted in a blowdown stream. Additionally, when ambient dry bulb temperatures are cool enough, water evaporation in the hygroscopic system is restricted to increase the proportion of dry sensible cooling. This technology is being demonstrated at two DoD facilities with contrasting climates to determine its range of water saving potential. The presentation will discuss hygroscopic cooling within the context of conventional wet cooling towers and existing water saving techniques together with demonstration updates from the two DoD facilities.