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Cooling in summer – heating in winter: “HVAC” (Heating, Ventilation, Air Conditioning) is a collective term for both stationary systems and mobile devices performing their functions in diverse applications: in office and residential buildings, factory halls, shopping centers, schools, and in all kinds of other public facilities. In addition, air conditioning systems are used in automobiles and aircraft.
The diversity of HVAC devices and technical systems is matched by the variety of the requirements to be met by the seals and sealing materials they use. For all of these needs, Parker Prädifa offers suitable sealing solutions and sealing materials, i.e., high-quality compounds based on proprietary formulations. Our materials are tailored specifically to meeting the challenges in HVAC applications and ensure optimum performance combined with maximum service life.
The following are key criteria to be observed in the selection of the sealing materials optimally suiting the intended application:
- Temperature Resistance
- Chemical Resistance
- Setting Behavior and Service Life at High Temperatures
Applications in Heating Technology
In conventional heating systems, including the increasingly widespread heat pumps, but also in future systems, the following generally applies: The high temperatures prevailing and the resulting setting behavior or compression set of the material on the one hand and its chemical resistance on the other directly impact the service life of the seal.
Applications in Ventilation and Air Conditioning
The functional range of air conditioning systems is much greater compared to heating systems. The diversity of the designs and functional principles of air conditioning systems and devices, and their applications (i.e., stationary, mobile/portable and on board of vehicles) is matched by the variety of requirements to be met by seals and sealing systems. The challenges here include both high and low temperatures, high operating pressures of up to 150 bar, and chemical resistance.
CO2 - The Refrigerant of the Future?!
The high operating pressure of the refrigerant CO2, its low critical point, formation of dry ice when temperatures drop below the triple point, and very high standstill pressure pose challenges and must be considered in the selection of the seals for the cooling system.
Fields of Application
Industrial and Commercial Buildings
Working effectively is hard to imagine without heating and air conditioning systems - whether in small, medium-sized or large industrial and commercial facilities. Temperature control and fresh air supply, even in hard-to-access places, are prerequisites for climatic conditions at the workplace that employees perceive as pleasant and that exclude health risks. In these applications, which frequently operate 24/7, efficiency and reliability are imperative.
Automotive
An effective air conditioning system is expected as a standard feature of any modern automobile. Automotive air conditioning systems consist of a large number of refrigerant-carrying components such as compressors, condensers, dryers, expansion valves, evaporators and lines.
Avoidance of leakage is extremely important on all of these components for two reasons: first, an excessive escape of refrigerant from the circuit would be harmful to the environment and second, the system would no longer be functional and need to be refilled.
With both electrical powertrain components and internal combustion engines, the ideal operating temperature is playing an increasingly important role in efficient and eco-friendly operation. At the same time, customer expectations of cabin comfort have to be met.
Residential Buildings
Proper temperature and ambient air control is an important factor of indoor comfort at home. Parker offers suitable sealing solutions for all challenges in the areas of heating, hot water, and air conditioning applications.
Aviation
Air conditioning systems in aircraft are referred to as “Environmental Control Systems“ (ECS). Compared to air conditioning systems like those in buildings, an ECS controls air pressure in addition to temperature and air exchange. The seals used in aviation applications meet the most exacting demands in terms of power density in small grooves as well as maximum safety requirements.