Outdoor Air Handling Unit

Correction under different wind speeds, inlet air temperature, and water temperature conditions:

Actual cooling capacity = Cooling capacity from Table 1 × K1 × K3
Actual water flow = Water flow from Table 1 × K1 × K3
Actual water resistance = Water resistance from Table 1 × K2 × K4

Example: Selecting YG-20 air conditioner, the cooling coil face wind speed is 2.5 m/s. According to Table 1, the cooling capacity is 150.8 kW, water flow is 26.21 m³/h, and water resistance is 14.07 kPa. Determine the actual cooling capacity, water flow, and water resistance when the inlet air dry-bulb temperature is 27°C, wet-bulb temperature is 21°C, inlet water temperature is 7°C, and outlet water temperature is 12°C.

Solution: From Table K1, the correction factor K1 = 1.14. From Table K2, the correction factor K2 = 1.27.
Therefore:

Actual cooling capacity (Q) = Standard condition cooling capacity × K1 = 150.8 × 1.14 = 171.91 kW
Actual water flow (V) = Standard condition water flow × K1 = 26.21 × 1.14 = 29.88 m³/h
Actual water resistance (P) = Standard condition water resistance × K2 = 14.07 × 1.27 = 17.87 kPa

Heating, water volume, water resistance

Heating conditions: air inlet temperature 15℃, water inlet temperature 60℃

Note: 1. The unit's performance reference at a headwind speed of 2.5m/s
2. The coil is a dual-purpose coil for hot and cold applications

●Air Filters: Remove dust, pollen, and airborne contaminants from the incoming air.

●Cooling and Heating Coils: Adjust the air temperature based on seasonal requirements.

●Fans and Blowers: Propel the conditioned air into the building's ventilation network.

●Energy Recovery Systems: Capture heat from exhaust air to pre-treat incoming fresh air, improving energy efficiency.

●Weatherproof Casing: Durable, insulated housing that protects internal components against outdoor weather conditions.

●Control Systems: Modern OAHUs are integrated with smart controllers for monitoring temperature, humidity, CO₂ levels, and equipment performance.

Blower:Blower bearings use lubricated precision ball bearings, and the outer seal ring of the bearing is made of polyamide rubber, which is resistant to high temperatures and can absorb vibration and mechanism noise. The impeller of the purification series air conditioner fan is made of high-quality steel plate (backward-inclined impeller is configured as required), which is more in line with the specific shape of aerodynamics, with high efficiency and low noise.

 

Surface cooler: The copper tube and aluminum sheet structure is adopted. The copper tube and aluminum sheet are tightly combined by mechanical or water pressure expansion, and tested by 1.6Mpa air pressure to ensure the minimum contact thermal resistance to achieve the best heat transfer effect. The condensate tray is made of high-quality steel plate or SUS304, double-layer filled with polyurethane foam, and the slope design is more conducive to the discharge of condensate, which has obtained the national patent

Filter: Primary, medium and high efficiency filtration sections are equipped with differential pressure gauges to monitor the initial and final resistance of the filter, providing a scientific basis for filter replacement. Primary, medium and high efficiency filters, as well as photohydrogen ion, high voltage electrostatic and electronic purification filters can be configured according to requirements.

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