ALL THINGS GREEN
Reaching for the beam
Michael Ainley, managing director of Frenger Systems, believes that chilled beams are the perfect partner for sustainable HVAC solutions.
I
n chilled beams the integral heat exchanger coil is designed for ‘dry’ operation as they operate at elevated water temperatures above dew point, typically 14°C water flow temperature for chilled beams and 15°C flow for chilled ceilings. Chilled beams are purpose-designed for such an operation of elevated water temperatures and as such are ideal for the applications, as opposed to other HVAC products that are primarily designed for ‘wet’ coil operation.
Mr Ainley explains that it is all about getting the right type of product for the application and not trying to adapt other types of products for applications outside of what they are primarily designed for; there is no such thing as one size fits all. He states: “Chilled beams are more suitable for certain applications and one of those
38 July 2019
applications is its primary function, operating above due point with a ‘dry’ coil.” Modern technology has allowed us to maximise buildings effectiveness in serving their primary purpose of providing shelter and warmth to their occupants, and since the introduction of the Minimum Energy Efficiency Standard (MEES) last year (2018), energy efficiency now needs to be at the forefront of designers and building owners plans. Mr Ainley goes on to explain that ground source and geothermal are opportunities for building owners and occupiers to harness natural energy that is readily available and extremely reliable, and it just so happens that the water temperatures from such naturally occurring energy sources yield water
flow temperatures that are above dew point (assuming 50% relative humidity), and such water temperatures provide for a ‘dry’ coil cooling solution with only the pump consuming any energy.
On a typical HVAC cooling system, it is the fan-powered terminal units and chiller that consume most of the energy and according to a recent report from the Carbon Trust, the HVAC systems account for almost half (49%) of a building’s energy consumption. As such, they are a key area to look for energy savings. With chilled beams working in conjunction with sustainable ‘green’ energy solutions – such as geothermal – the other forms of energy consumption are elevated for an optimised energy efficient and green credentials solution.
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