Opportunity
Brewer-Garrett was selected by the Ohio National Guard’s Camp Perry Joint Training Center to evaluate the existing HVAC system at the Conference Center and recommend possible system modifications and replacement equipment.
Solution
We provided three different solutions that offered the Ohio Army National Guard multiple options they could evaluate depending on their priorities. Our solutions highlighted the initial cost, long-term cost, overall system savings, equipment maintenance requirements, operational improvements, and more.
Option A:
This option would involve replacing the existing Variable Volume and Temperature (VVT) rooftop units with new VVT units. The controls would be upgraded to allow building management more control of the temperature.
Equipment to be replaced:
- RTU-1: 25 Ton Rooftop with Gas Heat, VVT
- RTU-2: 12.5 Ton Rooftop with Gas Heat, VVT
- RTU-3: 12.5 Ton Rooftop with Gas Heat, VVT
- RTU-4: 25 Ton Rooftop with Gas Heat, VVT
- RTU-5: 25 Ton Rooftop with Gas Heat, VVT
Option B:
This option would involve replacing the existing VVT rooftop units with new Variable Air Volume (VAV) units. The controls would be upgraded to allow building management more control of the temperature. These units are variable, rather than constant speed, and can allow the fan to slow down as needed while still delivering enough air into the building. The outdoor units we selected for this application are more robust than their VVT counterparts. Construction is heavier, and the angled coil design minimizes weather impact.
Equipment to be replaced:
- RTU-1: 25 Ton Rooftop with Gas Heat, VAV
- RTU-2: 12.5 Ton Rooftop with Gas Heat, VAV
- RTU-3: 12.5 Ton Rooftop with Gas Heat, VAV
- RTU-4: 25 Ton Rooftop with Gas Heat, VAV
- RTU-5: 25 Ton Rooftop with Gas Heat, VAV
Option C:
This option involves replacing four of the five existing units with new single-zone VAV rooftop units. Some ductwork modifications are required because the building will be re-zoned, essentially eliminating the need for zone dampers. These units will have variable speed fans, which can slow down at times while still maintaining temperature in the space.
Equipment to be replaced:
- RTU-1: 25 Ton Rooftop with Gas Heat, VAV
- RTU-2: 500 CFM, Make Up Air Unit
- RTU-3: 15 Ton Rooftop with Gas Heat, VAV
- RTU-4: 20 Ton Rooftop with Gas Heat, VAV
- RTU-5: 20 Ton Rooftop with Gas Heat, VAV
- One (1) – 8 Ton VRV Heat Recovery Unit w/ 4 associated indoor units
Results
After reviewing the existing systems, possible solutions, and their associated costs, our team recommended moving forward with Option B, replacing the existing VVT rooftop units with new VAV units. This option provides Camp Perry with robust equipment that will run more efficiently and better serve the facility’s operations.