AHU for Desert Climate, High Ambient 55°C

AHU Selection & Design Solution for Desert Climate | Max Ambient 55°C

Core challenges: extreme high temp 55°C, low humidity, strong solar radiation, sand/dust, high cooling load, component overheating.

1. Key Design Standards & Operating Range

Design ambient: DB 55°C / WB 28–30°C

Continuous running stability, anti-sand & heat-resistance structure

Extra cooling capacity margin, anti-overheat for fans/motors/electrical parts

2. Critical AHU Construction & Material Upgrade

Casing & Frame

Heavy-duty double skin panel, thick PU insulation

External panel: aluminum zinc coated / 304 stainless steel

Anti-corrosion, anti-UV, anti-rust for long desert outdoor exposure

Air-tight reinforced cabinet, prevent hot air infiltration

Sand & Dust Protection (Desert Must)

Multi-stage anti-sand filtration:

First stage: metal mesh anti-sand filter

G4 pre-filter + F7/F8 medium filter

Air intake with rain/sand louver, bird & insect proof net

Positive pressure cabinet design to stop fine sand ingress

3. Cooling Coil Special Design (Core)

Oversized cooling coil, extended fin area

High-efficiency hydrophilic aluminum fins, anti-dust coating

Thick copper tube, enhanced heat exchange at 55°C inlet air

Increase coil face area, reduce air velocity for better heat dissipation

Reserve 20~30% extra cooling capacity to handle peak 55°C

4. Fan & Motor Heat Resistance

High-temperature resistant EC fan / IP55 outer rotor motor

Insulation class: Class H (suitable for ＞60°C ambient)

VFD with high-temperature derating protection

Motor overheat alarm, thermal protection sensor

Heavy-duty dynamic balancing, sand-proof fan housing

5. Humidification & Dry Climate Adaptation

Desert ultra-dry air causes static & discomfort:

Adopt evaporative / steam humidifier

Auto RH control: maintain 35%–55%

Anti-scaling water treatment for humidifier module

6. Electrical & Control System Upgrade

All electrical components: high temperature resistant grade

Control box with thermal insulation + ventilation fan

BMS & DDC high-temperature protection logic

High ambient lock / overheat protection mode

Sunshade cover for outdoor AHU control panel

7. Condensate & Drain System

Even dry desert: large temperature difference produces condensate

Reinforced stainless steel drain pan

Deep anti-siphon P-trap (for high negative pressure)

Anti-dust drain pipe design, avoid sand blockage

8. Installation & Auxiliary Measures

Independent sunshade canopy & heat insulation cover for outdoor AHU

Avoid direct solar radiation on unit surface

Hot air exhaust away from fresh air intake

Regular sand cleaning access door design

Quick Selection Checklist for 55°C Desert AHU

Ambient certified: continuous operation at 55°C DB

Class H high temp motor, IP55 protection

Anti-sand multi-stage filtration system

25%+ cooling capacity margin

Anti-UV & anti-corrosion cabinet material

High temp resistant electric & control parts

Dry climate automatic humidification option