CHILLED BEAMS AND FAN COILS Continued from page 31.
known but addressing the client’s criteria and factoring in any design constraints can be challenging. Aesthetics and integration with other services in the ceiling – one of the most congested areas in a building needs to be acknowledged. As with any HVAC solution, understanding the space to be cooled and/or heated, usage and design constraints are essential. Poorly installed and commissioned systems can undermine any energy savings and prove costly to rectify.
The performances of chilled beams, like any other terminal unit, depends on the following characteristics: Q Design (length, shape and size of nozzles) Q Fresh air flow rate Q Fresh air flow temperature Q Water in/out temperatures Q Water flow rate Q Room air temperature (inducted air tem- perature)
A good mechanical engineer will conduct robust assessments, taking note of load, ventilation variations between zones, induction properties and aware of any pressure drops. There must also be adequate spacing between the beams and consideration given to mounting height are key consideration too and by adhering to the manufacturers recommendations the correct performance levels can be achieved. With their high efficiencies active beams can offer a viable and green HVAC solution and form part of a businesses net zero strategy and now the technology has stepped up a gear with beams offering greater efficiencies. Following two years R&D, in collaboration with the University of Aachen, Aermec developed the EHT active chilled beam. This next generation hybrid induction terminal combines, cooling, heating, fresh air, ventilation-only and air distribution in one device and are suitable for rooms with a ceiling height of up to four metres. The design was in response to plant engineering requests for a compact HVAC system that offered good air quality, acoustic comfort but also reduced energy consumption and limited costs with a good return on investment. Aesthetically any solution had to deliver an appealing design solution for interiors. The result offers an unbeatable output and currently one of the highest induction ratios on the market.
32 February 2023 •
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But what sets the EHT active beams apart is the innovative design of the nozzles. These were developed using CFD analyses and their moulded production quality guarantees and induction ratio up to six, (testing was undertaken by University of Aachen). In keeping with our company’s
environmental philosophy, the EHT active beam uses parallel heat exchangers and exploits the Coanda effect. Special attention was given to the optimisation of the finned coils, obtaining the maximum heat exchange coefficient with reduced pressure drops on the air and water side resulting in the highest levels of comfort whilst respecting the ecosystem.
Dehumidification is managed by the air handling unit, resulting in no condensate inside the EHT beam, eliminating the risk of mould and bacteria and other organisms
that may be harmful to health. Chilled beams are often pitted against fan coil units (FCUs). Chilled beams operate with higher water temperature than FCUs and the dehumidification effect is managed by the fresh air being previously treated in the AHU. (The AHU injects air of the highest quality into the space as it filters, treats and de- humidifies the fresh air before sending it to the beam).
Many studies have highlighted how the
deployment of chilled beam technologies can significantly reduce initial investment costs as well as operating costs compared to more conventional HVAC systems. They certainly offer a viable green HVAC solution which given the current energy issues are well worth considering.
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