BOLLFILTER used for the cooling water filtration in HVACshutterstock

Filtration for HVAC systems

Water as a cooling medium in HVAC systems

Heating, ventilation, and air conditioning (HVAC) systems maintain comfortable working temperatures by meeting the environmental requirements for large industrial facilities, chemical plants, large office complexes or hospitals.
Water that is used as a cooling medium in HVAC systems can be taken from extraction wells, rivers, lakes or from the sea.

Water filters as a prerequisite in HVAC systems

Any cooling water must be effectively filtered to remove suspended solids and organic matter like sand, sediments, silt, or algae. The cleanliness of the cooling water has a significant impact on the entire HVAC system.

Your benefits:

  • Removal of minor contaminants
  • Extended service life of the HVAC system
  • Prevention of heat exchanger blockage
  • Minimized operator involvement thanks to automatic filtration
  • Improved energy efficiency

District heating

At depths beyond 400m the geothermal heat from thermal water reservoirs can be used in „district heating“ systems. This sustainable source of energy is used to heat homes, buildings or industrial plants while generating nearly no CO2 emissions.

The hot thermal water is pumped up from deep underground, passed through a filter and then circulated through a heat exchanger. 
The thermal water heats a secondary closed loop which distributes the heat to homes and businesses that are connected to the district heating network. Filters are often required in the secondary loop to protect the pumps, piping and heat exchangers used in the system.
Once the thermal water exits the heat exchanger it is re-injected back into the earth. In many cases regulations state that the thermal water needs to be filtered before re-injection to avoid contamination of the thermal water reservoirs.

District heating water filtration

District heating water, is not just heated water. The water quality is of great importance to improve productivity. Proper water filtration is a precondition of optimum protection of components in the district heating system. 
BOLLFILTERs like the 
aquaBoll® or the Simplex Type 1.53.1 are used to protect both the primary thermal water loop and the closed secondary loop of the district heating system. They are specially designed for this application and remove solids out of the water in order to protect heat exchangers, pumps and bore reinjection of the geothermal plant.

Maximum efficiency of heat transfer
Maximum efficiency of heat transfer

Without reliable filtration, the contaminants would circulate through the system and settle on the heat transfer surfaces of the heat exchangers, reducing heat transfer efficiency and increasing pressure losses.

Protection of HVAC system components
Protection of HVAC system components

Solids in cooling water can damage equipment such as heat exchangers, refrigerating machines or heat pumps. Adequate filtration reduces the normal wear on the HVAC system.

Minimum consumption of energy and water
Minimum consumption of energy and water

Inefficient heat transfer results in an increased pressure drop and more cooling water being pumped in to enable the same cooling effect. Contamination thus leads to increased consumption of energy and water.

Automatic filtration for HVAC systems

BOLLFILTERS offer effective, automatic, self-cleaning filtration to meet the requirements of your HVAC system. aquaBoll® provides the flexibility of choosing among filter candles, sieve cylinders and fine sieve cylinders according to the required filtration efficiency and degree of water contamination.

BOLLFILTERS improve the efficiency of cooling and heating systems, reduce the overall maintenance cost, and help extend the service life of the HVAC system.

BOLLFILTER automatic installed at Hepworth Gallery
Hepworth Gallery »

Hepworth Gallery HVAC system lifetime has been extended with the use of a BOLLFILTER automatic for the filtration of the river water Calder.



NOCS, Southampton
National Oceanography Centre, Southampton »

The National Oceanography Centre, Southampton trusts BOLLFILTER for the seawater filtration of its HVAC system.

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Maurice Vianden
Maurice Vianden Application Manager

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