Rooftop 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

◆Heating Coils:

Some RTUs also incorporate heating coils, which can use gas, electricity, or hot water to provide heat when needed. This feature makes RTUs suitable for year-round operation, as they can both cool and heat the air.

◆Fan/Blower:

The fan or blower draws in the air, passes it over the cooling or heating coils, and distributes it into the building's ductwork. The blower typically has multiple speed settings or variable speed to control airflow based on the building's needs.

◆Air Filters:

High-quality filters are integrated into RTUs to remove dust, dirt, pollen, and other particulates from the air before it enters the system, ensuring that the air supplied is clean and healthy.

◆Damper and Vents:

Dampers are used to control the volume of outside air that is brought into the system. Fresh outdoor air is introduced for ventilation purposes, ensuring proper indoor air quality.

◆Control System:

The RTU is equipped with a control system (often integrated into the building's central Building Management System, or BMS). This system regulates temperature, airflow, and sometimes humidity levels to maintain the desired indoor conditions.

◆Condenser (for Refrigerant-based RTUs):

The condenser unit is located outdoors on the rooftop and works with the refrigerant to expel the heat absorbed by the evaporator coils. It's often located within the RTU itself but can be a separate component, depending on the system design.

◆Ductwork Connections:

RTUs are connected to the building's ductwork, which distributes the conditioned air throughout the space. These ducts lead to the various rooms or zones of the building.

◆Drainage System:

RTUs feature a drainage system to remove the condensate that forms on the cooling coils. This ensures that excess moisture does not accumulate inside the unit or building.

◆Commercial Buildings:

RTUs are widely used in commercial buildings such as offices, malls, hotels, and restaurants where large volumes of air need to be conditioned. They are ideal for buildings with flat rooftops or large roof spaces.

◆Industrial Facilities:

In factories, warehouses, and manufacturing plants, RTUs are used to manage the temperature and air quality in large, open spaces. They help maintain comfortable working conditions for employees and protect equipment from overheating.

◆Healthcare Facilities:

Hospitals and clinics require precise control over temperature and air quality. RTUs help provide consistent, filtered, and conditioned air while ensuring fresh outdoor air is introduced for proper ventilation.

◆Educational Institutions:

Universities, schools, and other educational facilities use RTUs to manage the climate in large lecture halls, classrooms, and common areas.

◆Data Centers:

RTUs are critical in data centers to maintain the proper temperature and humidity levels for sensitive IT equipment, ensuring reliability and uptime.

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