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Cleanroom HVAC and Air Handling Equipment
Direct-Expansion Cooling Coil
A direct-expansion evaporator coil that boils refrigerant inside multiple copper circuits to cool and dehumidify cleanroom air.
- Multi-Circuit Refrigerant Distribution
- Direct Evaporative Cooling
- Large Suction Header
- Matched Condensing Unit Service
Product Introduction
Liquid refrigerant enters a brass distributor and divides through small feeder tubes into multiple copper circuits. It evaporates as air crosses the fin pack, then returns through a large suction header to the remote condensing unit. Distributor sizing, circuit length and coil orientation are coordinated to keep all rows active across the expected load range and to return oil reliably.
Key Features
Copper circuits and aluminum fins provide direct sensible and latent cooling without a secondary water loop.
A large suction header collects vapor at controlled velocity for stable superheat and oil return.
Independent or intertwined circuits can support staged compressors and part-load face coverage.
Customer Product Concerns
DX coils depend on uniform refrigerant distribution and correctly matched circuits to prevent starving, flooding and temperature streaks.
Unequal feeder flow leaves some coil circuits inactive.A matched distributor and equal-length feeder tubes divide refrigerant across every circuit.
Low load causes unstable superheat and liquid carryover.Staged or intertwined circuits preserve active face area and stable expansion-valve control.
Long suction runs fail to return compressor oil.Header diameter, circuit velocity and piping traps are selected around the remote condensing unit.
Condensate carryover wets downstream filters.Coil face velocity, fin treatment and drain-pan geometry are coordinated for complete drainage.
Typical Applications
Remote-DX cleanroom air handlersPackaged make-up air unitsLaboratory environmental chambersMedical manufacturing HVACDedicated humidity-control systems
Technical Parameters
Representative construction ranges for a multi-circuit cleanroom DX evaporator coil are listed below.
| Core Material | C12200 copper refrigerant tubes with aluminum fins, brass distributor and copper suction header |
|---|---|
| Panel Thickness | 1.5-2.0 mm galvanized or stainless casing |
| Effective Width | 400-2800 mm active fin face width |
| Maximum Length | Up to 4000 mm overall coil casing length |
| Steel Facing Thickness | 1.0-1.5 mm stainless drain pan where supplied |
| Core Density | Approximately 8940 kg/m³ for the C12200 copper refrigerant-tube circuit |
| Thermal Conductivity | Approximately 339 W/(m·K) for the C12200 copper DX refrigerant tubes at room temperature |
| Surface Finish | Natural, blue hydrophilic or epoxy-coated aluminum fins |
| Joint Type | Brazed copper refrigerant circuits with flared or brazed distributor and suction connections |
| Customization | Available based on the intended application and operating environment. |
Available Options
Single, staged or intertwined refrigerant circuitsDifferent tube diameters and row countsHydrophilic or epoxy-coated finsStainless casing, drain pan and moisture eliminator
Planning a Direct-Expansion Cooling Coil specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
