Dx Air Handler

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

●Direct Expansion Coil:
The core of the system is a DX coil where refrigerant evaporates (in cooling mode) or condenses (in heating mode) to directly exchange heat with the air.

●Compact and Simplified Design:
Without the need for additional components like chillers, pumps, and extensive piping, DX air handlers have a smaller footprint and can be easier to install.

●Efficient Air Distribution:
Equipped with fans or blowers, the unit draws in return air, filters it, and passes it over the DX coil before distributing the conditioned air throughout the building.

●Zoned Control:
DX air handlers can often be configured to serve individual zones, allowing for independent temperature control in different areas of a building.

●Quick Response:
The direct refrigerant cycle provides rapid cooling or heating, improving occupant comfort by quickly responding to changes in load conditions.

●Commercial Buildings:
Ideal for offices, retail spaces, and restaurants where centralized chilled water systems are not justified by the cooling load.

●Residential Complexes:
Often used in multi-family or high-rise residential settings for efficient, localized air conditioning.

●Mixed-Use Developments:
Suitable for buildings with diverse occupancy patterns that require zoned air conditioning.

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