Cleanroom HVAC and Air Handling Equipment

Cleanroom Direct-Expansion Air Conditioning Unit

A cleanroom air-conditioning package that uses a refrigerant evaporator coil for direct sensible cooling and dehumidification without a chilled-water circuit.

Direct Refrigerant Cooling
Matched Condensing System
Controlled Dehumidification
Cleanroom Filter Staging

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Product Introduction

The cleanroom direct-expansion air-conditioning unit combines a refrigerant evaporator coil with cleanable filters, a drainable condensate section and variable-speed supply fan. A matched outdoor condensing unit or remote condenser rejects heat without requiring a central chilled-water plant. Multiple compressor stages or inverter capacity allow the coil to follow varying cleanroom load, while reheat can stabilize room temperature during dehumidification. Refrigerant piping, oil return and coil distribution are designed for the selected distance and lift.

Key Features

Direct refrigerant expansion removes the intermediate chilled-water loop for smaller independent cleanroom systems.

Variable or multi-stage compressor capacity reduces cycling under partial sensible load.

A drainable insulated coil section contains condensate produced during moisture removal.

Reheat and fan-speed control support temperature stability during latent operation.

Customer Product Concerns

DX systems must match refrigerant capacity, air volume and coil temperature closely to avoid cycling, water carryover and unstable humidity.

A single large compressor repeatedly starts and stops at low cleanroom load.Inverter or staged compressors modulate closer to the active sensible and latent demand.

An unevenly fed evaporator leaves parts of the coil warm and reduces dehumidification.Matched distributors and expansion control maintain stable refrigerant feed across circuits.

Condensate is carried downstream during high latent load.Proper coil face velocity, eliminator clearance and a full drain pan control water.

Long refrigerant piping causes oil-return and capacity problems.Pipe size, traps and allowable lift are selected for the matched compressor and circuit.

Typical Applications

Independent cleanroom suitesMedical-device assembly roomsSmall pharmaceutical laboratoriesElectronics test areasCleanroom retrofit projects

Technical Parameters

Representative casing values for a cleanroom DX air-conditioning unit are shown below.

Core Material	Closed-cell polyurethane insulation in double-skin indoor-unit panels
Panel Thickness	40–60 mm insulated casing
Effective Width	700–2400 mm nominal indoor-unit width
Maximum Length	Up to 5500 mm including filters, evaporator, reheat and fan
Steel Facing Thickness	0.6–1.0 mm coated casing sheet
Core Density	40–45 kg/m³ closed-cell polyurethane
Thermal Conductivity	0.022–0.026 W/(m·K) for panel insulation
Surface Finish	Powder-coated outer casing with galvanized or stainless wet-section liner
Joint Type	Gasketed low-leakage panels with brazed refrigerant headers and flexible duct collars
Customization	Available based on the intended application and operating environment.

Available Options

Air-cooled or water-cooled condensing unitFixed-stage or inverter compressorHot-gas, electric or hot-water reheatRemote controller and building-management interface

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