Hospitals & health
24/7 AHU air disinfection
When a major international financial institution wanted to improve indoor air quality (IAQ) at its 250,000- square feet central London commercial offices in order to comply with the WELL Building Standard and save energy, Gibbons Ultraviolet Solutions was commissioned to undertake the project
the operation. Prior to the installation of CoilCare, a U-value of 8,587w/m2
K was recorded from the
client’s cooling coil. The U-value after CoilCare was fitted was 12,169 w/m2
K – an increase of 41.71%. Results
Annual chilled water volume reduced from 28,849 to 18,507 tonnes – a reduction of 35.85% which meant the client would enjoy annual savings of £2,116 for a single coil.
Surface sampling I
t was decided to install Gibbons’ CoilCare ultraviolet germicidal irradiation (UVGI) air and surface disinfection system within the building’s air handling units (AHUs), with a view to eradicating contaminants and returning the equipment to its original operating condition. The cooling coil of an AHU is a breeding ground for mould, viruses and bacteria, which form a slimy substance on the coil fins known as biofilm. As well as reducing cooling coil efficiency by
restricting thermal conductivity and therefore increasing energy consumption, biofilm contaminates the airstream which may jeopardise the health, wellbeing and productivity of building occupants.
CoilCare uses powerful high-output ultraviolet-C
(UVC) photoniser lamps to disinfect throughout the cooling coil by disrupting the biofilm’s DNA and eradicating it. The system is chemical free and requires minimal maintenance, with photonisers having an 18,000-hour service life. Continued use of the CoilCare system is said to prevent the re-growth of biofilm, maximises AHU performance and helps protect all building users.
The importance of the U-value
U-values measure a cooling coil’s thermal performance. The higher the value, the more efficient
Contact plate samples were taken from the face of the cooling coil and 60 days after the installation of two CoilCare CCX 48 High-Output photonisers, the sample proved that mould had been eliminated in line with expectations.
Outcome
After installation and running costs, the client achieved net annual energy savings worth £1,633. The ROI is calculated at two years and nine
months. The installation has made a significant contribution to the client’s drive towards WELL Building Standard certification.
BOILER HIRE STOPS CARE HOME CLOSURE A
Kent residential care home suffering complete boiler failure following sporadic malfunctions, faced the prospect of closure
without the intervention of a boiler hire company. Andrews Boiler Hire responded to assist the care home maintain comfortable standards by supplying and installing a high efficiency portable oil-fire boiler solution. This restored warmth and hot water facilities to all areas of the home including all 22 bedrooms and community social areas. Whilst new permanent boiler replacements were sourced, managers at the care home
turned to Andrews Specialist Hire to supply a temporary heating solution from the Andrews Boiler Hire division. A full site survey and risk assessment was
carried out by specialists from Andrews Boiler Hire to achieve the best solution to the problem, ensuring that the temporary boiler would be supplied and installed in a manner with no risk to the care home residents. Without the solution, the home would have had to close and all 50 residents needing round-the- clock attention would have had to be relocated.
May 2017
To resolve the issues, Andrews Boiler Hire supplied a 250kW oil fired boiler, a 3,000 litre fully bunded fuel tank, temporary boiler hoses and BSP connections. The boiler was positioned adjacent to the main entrance of the home, but full pedestrian access was maintained. The temporary flow and return pipework was run at a safe, high level into the existing boiler room via access hoses drilled through the wall; hoses were then connected to BSP connections already installed. Successful commissioning meant the system was able to restore heating and hot water.
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