George Mason University commissioned Leach Wallace for the design of their Ice Vault and Boiler Upgrade for the main campus in Fairfax, Virginia. The firm provided mechanical and electrical engineering design services to replace the existing 10,000,000 BTUH high temperature, hot water boiler, with a 25,000,000 BTUH boiler.
The high temperature, hot water plant, was converted from primary pumping only to a variable flow primary secondary. A 450 ton cooling tower and pump was added to an existing common header condenser water system as part of a campus master plan. A 7200 ton-hour ice storage vault was added to double the existing system capacity, for a total ice storage capacity of 14,400 ton-hours. Also incorporated into the design was an ice storage system utilizing a "hydro-coil" design for ice melt. Finned coil chilled water heat exchangers are mounted on top of the glycol ice coil stacks and exchange heat with the surrounding ice water in the vault during ice melting operation.