Hydronic 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

Coils/Heat Exchangers:

The core component of a hydronic air handler is its coil, where hot or chilled water circulates. The air handler has a heating coil (for hot water) or a cooling coil (for chilled water). The air passes over these coils, transferring heat or cooling to the air.

Fan:

A fan blows air over the hydronic coil to promote heat transfer between the water in the coil and the air. The fan pushes the conditioned air into the supply ductwork to distribute it throughout the building.

Water Supply:

The hydronic system relies on a central boiler for hot water or a chiller for chilled water. Water is pumped through pipes to each air handler, where it circulates through the coils.

Pumps:

Circulating pumps move the hot or chilled water through the system. The pumps ensure that water continuously flows to the air handler coils and is returned to the central heating or cooling source.

Control Valves:

Control valves regulate the flow of water through the coils, which in turn controls the temperature of the air being conditioned. Thermostats and building control systems often work with these valves to adjust water flow as needed.

Air Filters:

Hydronic air handlers typically include air filters to remove dust, dirt, and other particulates from the air, improving indoor air quality.

Drain Pan and Drainage System:

In the case of chilled water systems, condensation may occur on the cooling coil. A drain pan and drainage system collect and remove excess moisture to prevent water damage or mold growth.

 Commercial Buildings:

Hydronic air handlers are widely used in office buildings, malls, and retail spaces. The ability to use water as a heat transfer medium allows for efficient temperature control, especially in large spaces.

 Residential Buildings:

In homes with radiant heating or cooling systems, hydronic air handlers are used to condition the air in different rooms. They work well in high-end homes, multi-family apartments, and luxury residences.

 Industrial Facilities:

Factories, warehouses, and manufacturing plants often use hydronic air handlers to maintain comfortable conditions for workers and protect equipment from overheating.

 Hospitals and Healthcare Facilities:

Hydronic air handlers provide precise temperature control, which is critical in operating rooms, patient rooms, and labs, where both heating and cooling may be required.

 Data Centers:

Hydronic air handlers can be used to manage temperature in data centers where server equipment requires efficient and precise cooling to prevent overheating.

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