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When it gets really hot outside in the summer, you still need to maintain the required low temperatures in storage and cooling rooms. To help you achieve this feat, water-cooled heat exchangers are used in the building sector, in which water is cooled down as a cooling liquid in a closed circuit system and then fed into the refrigeration technology at a low temperature.
These kinds of water chillers or chilled water units are usually installed on the roof of a building and require a sufficiently high air flow rate to cool the cooling liquid down to the required temperature. For this purpose, it is mainly axial fans with speed control that are used; however, without corresponding optimisation during operation, these produce considerable noise emissions.
With the ZAplus axial fan, ZIEHL-ABEGG has developed and optimised modern air flow, which is also suitable for water coolers and chiller systems. The ZAplus housing ensures optimum air flow and has been developed with state-of-the-art flow simulations referred to as CFD (computational fluid dynamics).
The housing is manufactured using plastic injection moulding processes, which ensures that it can be reproduced exactly. On the suction side, air supply is crucial for optimum fan operation; this is achieved by the perfect interaction between the proven FE2owlet blade design and the ZAplus nozzle. On the pressure side, the air flow of an axial fan generally contains high rotating flow components, which have a negative effect on efficient and low-noise operation. This is why ZIEHL-ABEGG uses guide vanes and a short diffusor in the ZAplus, which provide a noticeable improvement in performance data and acoustics. If required, the air flow rate can be further improved with our high-end diffusor, the ZAplus+.
This addition will almost certainly be worth it. If the total costs of a plant are considered, from acquisition to decommissioning, it is mainly the costs incurred during operation that have an impact. These can account for more than 90% of the product’s costs over its lifetime. If, for example, the standard fans of a water chiller are replaced by ZAplus fans of the same size, this leads to a significant and permanent reduction in power consumption and therefore permanently reduces energy and operating costs. What’s more, all our products have successfully undergone an extensive approval and testing process and therefore impress not only with their performance values, but also in terms of durability and longevity.
With conversion or retrofitting, either the air flow rate can be increased with the same floor space, or the same air flow rate can be achieved as before, but power consumption and noise emissions can be significantly reduced. In any case, a system such as a water cooler can be retrofitted with ZAplus in just a few steps thanks to RETRO-FIT. Because the axial fan has a flange on both sides, it can be used for both air flow directions and is suitable for a wide range of different end devices.
For installation, all you need to do is dismantle the old fan and cut out the required hole circle. If you have to remove the entire old housing to dismantle the old unit, you could also cover the ZAplus with a square wall ring plate to make installation easier. Then, just screw the ZAplus to the housing, pull the necessary connecting cables through the cable duct and connect them to the motor. If necessary, mount the protective grille, and you’re done. It really can do it all – and is one of the best!
Owls are efficient hunters in the air. This is why we have used their wings as a template for the FE2owlet axial fan and transferred it contour and structure to the fan blade. For example, we have developed a particularly low-noise blade that can be implemented universally with fully speed-controlled air flow rates of up to 52,000 m³/h and a static pressure increase of up to 418 Pa.
This biomimetic axial fan is available from ZIEHL-ABEGG in either the AC or ECblue version with EC technology, which is perfectly matched to the fan with integrated controller. FE2owlet is also suitable for chilled water units and chillers and, due to its optimised shape, boasts very quiet operation and a long service life.
Dry coolers and chillers used for air conditioning in residential and office buildings as well as industrial plants must deliver the required output even under fluctuating outdoor temperatures. At the same time, noise emission requirements play a vital role. This applies not only to sound radiation within buildings, but increasingly to sound radiation directed towards neighbouring properties.
With biomimetic blades and matched system components, ZIEHL-ABEGG offers solutions for a wide variety of application demands. In addition, products such as the ZAplus system and the FE2owlet blade are specifically engineered for reduced noise generation.
When shipping ZAplus, additional transport packaging is not required. The composite nozzle used is inherently corrosion resistant. In combination with suitable corrosion protection measures, the axial fans are designed to meet the rigorous demands of refrigeration and air conditioning technology, including requirements regarding mechanical stability and UV resistance.
Even after reaching series production readiness, the products undergo continuous endurance testing in outdoor environments. Furthermore, service life tests are conducted under diverse operating conditions—such as low temperatures at high altitudes or high ambient temperatures on test benches.
ZIEHL-ABEGG also provides an extensive range of accessories for axial fans. Alongside the ZAplus+ diffuser, which enables higher volume airflow in the lower pressure range, various safety elements are available. These include guard grilles made of powder-coated steel or stainless steel in accordance with DIN EN ISO 13857:2008 for the suction or discharge side. To prevent ice formation in the tip clearance, a UL-certified heating tape with protection class IP54 is available, optionally with an insulating sleeve. Connectors and cables for commissioning are also provided.
The combination of biomimetic design principles, matched system components and extensive experience in the field of ventilation systems enables solutions for diverse applications in refrigeration and air conditioning technology. The products are designed to meet stringent requirements regarding performance, energy usage and ease of installation, and are also suitable for retrofitting existing systems.
Whether condensers, chillers, evaporators, blast freezers, fan heaters, wall-mounted fans, heat pumps or ventilation units: with ZAplus, an airflow system is available that was developed specifically for diverse application areas in refrigeration and air conditioning technology.
* These ZIEHL-ABEGG products, which are suggested as possible solutions for these applications, are purely informative and serve as a rough guide. Consequently, individual contact with our technical sales experts is necessary and advisable with regard to a specific application so that the individual use can be checked and approved with regard to the explicit conditions.
