Rooftop Air Handler Units

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

• All-in-One System:Rooftop HVAC units combine all essential components-such as compressors, fans, coils, filters, and controls-into a single, compact package. This integration simplifies the installation process and reduces the space requirements within the building.
• Space Saving:By placing the HVAC system on the roof, rooftop units free up valuable indoor space that can be used for other purposes. This is particularly advantageous in urban settings where floor space is at a premium.
• Easy Installation and Maintenance:Rooftop units are relatively easy to install and maintain. Their accessibility on the roof means that maintenance can be performed without disrupting indoor activities. Additionally, the units are pre-assembled and factory-tested, which minimizes installation time and labor costs.
• Energy Efficiency:Many modern rooftop HVAC units are designed to be highly energy-efficient, incorporating features such as variable-speed fans, energy recovery ventilators, and high-efficiency compressors. These features help reduce energy consumption and lower operating costs.
• Modular Design:Rooftop units are often modular, allowing for easy expansion or upgrading as the building's HVAC needs change. This modularity makes it straightforward to add additional capacity or integrate new technologies.
• Weather Resistant:Designed to withstand outdoor conditions, rooftop units are constructed with weather-resistant materials and features that protect them from rain, snow, and extreme temperatures, ensuring reliable operation year-round.
• Flexible Configuration:Rooftop units can be configured to meet the specific heating, cooling, and ventilation needs of a building. They can handle various types of air distribution systems and accommodate different airflow and filtration requirements.
• Noise Reduction:Modern rooftop units incorporate noise-reducing technologies to minimize the impact of operational noise on the building's occupants, making them suitable for use in environments where noise levels must be controlled.

• Commercial Buildings:Widely used in office buildings, shopping malls, restaurants, and retail stores to provide efficient heating and cooling across large spaces.
• Industrial Facilities:Installed in factories, warehouses, and other industrial settings to maintain comfortable and controlled indoor environments, crucial for both employee comfort and product integrity.
• Healthcare Facilities:Used in hospitals, clinics, and medical offices to ensure a clean, temperature-controlled environment that meets the stringent air quality standards required for patient care.
• Educational Institutions:Employed in schools, colleges, and universities to provide consistent and reliable climate control, ensuring a comfortable learning environment.
• Data Centers:Installed in data centers and server rooms to maintain precise temperature and humidity levels, protecting sensitive electronic equipment from heat and moisture.
• Multi-Tenant Buildings:Used in apartment complexes and mixed-use buildings to provide centralized climate control that can be easily managed and maintained.

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