Application of Vertical In-Line Pumps in Heating and Air Conditioning Systems

Vertical in-line pumps, known for their compact structure and convenient installation, play a vital role as the "heart" for blood circulation in modern building heating and HVAC (Heating, Ventilation, and Air Conditioning) systems due to their unique design and performance.

Their core application value lies in: efficiently and energy-savingly circulating heat transfer media (water or glycol solutions, etc.) to facilitate the transport and distribution of heat.

I. Main Application Scenarios

1,Secondary Circulation System:

1)In Heating Systems: Draw high-temperature hot water from heat exchangers (e.g., plate heat exchangers) or boilers and distribute it to various terminal heat dissipation devices in the building (e.g., radiators, underfloor heating pipes, fan coil units).

2)In Air Conditioning Systems: Draw chilled water from the evaporator of chillers and distribute it to air handling units (AHUs) or fan coil units (FCUs) in different zones to provide cooling capacity.

2,Distributed Circulation Systems:

In large building complexes or district energy systems, vertical in-line pumps are often used at the inlet of individual buildings or units as the circulation power source for that section. This enables precise, independent flow and pressure control, preventing hydraulic imbalance in the system.

3,Boiler or Chiller Unit Integration:

Installed directly on the inlet/outlet piping of the host unit, serving as an internal or external circulation pump to ensure water flow smoothly passes through the unit for heating or cooling.

4,Hot Water Pressure Boosting:

Used in domestic hot water systems to maintain pressure and circulation within the hot water network. This ensures users get hot water quickly upon opening the tap, avoiding water waste from running cold water.

II.Key Considerations in Application

1,Material Selection:

1)For heating systems, the pump body material must withstand higher temperatures (typically hot water temperatures between 60°C - 95°C), and seal materials must also be heat-resistant.

2)For air conditioning chilled water systems, temperatures are lower, but considerations like seal corrosion prevention are important.

2,Flow and Head:

The required water flow (based on the system's designed thermal/cooling load) and the head needed to overcome system pipe resistance must be precisely calculated. This is the basis for selecting the appropriate pump model. Oversizing or undersizing leads to inefficiency or poor system performance.

3,Variable Frequency Drive (VFD) Control:

In modern intelligent buildings, vertical in-line pumps are often combined with Variable Frequency Drives (VFDs). VFD-controlled pumps can automatically adjust their speed and power output based on actual system load changes (e.g., day/night, seasonal temperature differences), achieving "on-demand supply." This results in significant energy savings and extends pump life.