In this Xetex project, a Custom Dedicated Outdoor Air System (DOAS) with a robust 120-ton DX is showcased and designed specifically for a fragrance manufacturing application.
Although the unit did not handle any caustic substances, the customer placed great importance on proper handling of fumes. Addressing this concern, a flat-plate aluminum heat exchanger was chosen for its minimal EATR leakage. Additionally, a specialized control sequence was implemented to maintain a negative pressure differential on the exhaust side of 1.5”w.c. below that of the supply side, ensuring optimal performance. Finally, the custom DOAS utilizes MERV 8, MERV 13 and Charcoal filters to remove particulates for the OA, RA, and SA streams. Unit startup was provided by a factory certified technician, as is key for any custom unit to ensure correct operation.
Unit Specification
Model: XHS-80-120-RT-BP-CD-HI-SF-AC
Height: 136”
Width: 164”
Length: 438”
Weight: 38,000 lbs.
OA Summer Design: 93°Fdb / 74°Fwb
OA Winter Design: 10°Fdb
Supply CFM: 28,000
Energy Recovery: Aluminum flat plate HX
Cool Type: 120 tons - DX
Heat Type: Indirect Gas Furnace
Leaving Cooling Temp: 53.8°Fdb / 53.6°Fwb
Leaving Heating Temp: 68.0°Fdb
Construction
- Outdoor unit with 2” double wall construction:
- 18ga/22ga casing with mineral wool insulation
- Welded steel base frame
- Unit designed in four split sections
Features
- 460/60/3 single point power connections with non-fused disconnect switches
- Access Lighting
- ODP Premium Motors
Components
A) Low leakage OA shut-off damper
B) OA 2” MERV-8 Filter
C) OA 4” Mini Pl MERV-13 filters
D) OA face & bypass dampers with actuators
E) EA shut-off damper
F) SA & EA Fan arrays with energy-efficient airfoil fans
G) RA 2” MERV-8 filters
H) RA Carbon filters
I) XLT flat plate heat exchanger
J) SA Carbon filters
K) DX Coil
L) Stainless steel indirect-fired natural gas furnace
Contact XeteX for your next custom DOAS.