COMBINED HEAT & POWER


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As a result of installing our UVC technology next to the cooling coils, it will cleanse the coils continuously and prevent the build-up of any biofilm on the coil surfaces, creating a healthier atmosphere for building occupants by disabling viruses, bacteria and mould spores that pass by the powerful UVC Emitters.


It will also improve the energy efficiency of the


AHUs, as a result of the cleansing action of the UVC on the coil fins and tubes. How UVC Works


There will need to be approx. 2-300mm clearance either in front of, or behind, the cooling coils, although the ideal positioning of the UVC is the Air off side of the coil, over the drain pan


Any filters that are in direct line of sight of UVC light must be made from UV stable material, (i.e. glass media), to avoid deterioration of the filter material, which may then break down and contaminate the coil and plenum.


Technical Overview UVC Solution


The technology we recommend is based upon UVC light at 253.7nm, which destroys the biofilm that will be present on the coil surfaces and upon which mould, bacteria and viruses thrive. This is achieved by the UVC light disrupting the DNA of the micro-organisms which come into direct contact with the light, preventing any reproduction.


By installing the UVC lights in close proximity to the cooling coils of the AHUs, it prevents the micro- organisms from reproducing and clogging the coils of the air conditioning systems and from being blown through the plenums into the occupied space. This purification process helps to improve the indoor air quality, greatly reducing the spread of viruses and bacteria in an enclosed environment, in particular, where air is being recirculated.


Additionally, it will maintain the efficiency of the AHUs by cleansing the coils and keeping them to near their original performance specification, reducing both energy and maintenance costs.


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Wembley Hill: installation of a prepackaged plant room


he Coronavirus lockdown brought many building and HVAC projects to a standstill. But there is a clever way to keep things moving: off-site building. This is how Helec Ltd, an M&E specialist in the specification, design and installation of Combined Heat and Power systems (CHP), completed the final commissioning required to hand over a pre-packaged plant room at 34 Wembley Hill Road in North London, to one of their design and build construction partners, Formation Design & Build Limited.


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The plant room now produces space heating and hot water services whilst also generating electricity for the 24-storey apartment block, which stands just across from the Wembley Way concourse, the home of England’s national football stadium. Having already worked with Helec for two years, Formation Design & Build Limited decided to task Helec with this project in December 2018 because the company’s competitive EnSmart pre-packaged plant room was able to fit into the available space, which at approximately eight by eight metres, only offered limited room. The plant room was built off-site at Helec’s premises near Bristol through January until March 2019, and delivered into the plant room area on site at Wembley in April 2019. In the spring of 2020, once the shell and core build were complete, the final set up and commissioning of the CHP and back up boilers was completed in the plant room, enabling domestic hot water and space heating services to be delivered to all 198 apartments via “ModuSat” Heat Interface Units supplied by Evinox. In May 2020, the plant room - now fully operational - was handed over to Formation Design & Build Limited.


Helec’s UK Technical Sales Manager Jonathan Passmore explains: “What tends to happen is that the plant room is put into place, generally in the restricted basement area, and the rest of building is then constructed up around it floor by floor. Eventually, as each floor is completed, we fit the heat interface unit, which delivers the space heating and domestic hot water, into each one of the 198 apartments.” Helec’s pre-packaged plant rooms are designed and constructed off-site, ready to be installed into ready-to-receive building plant room areas, with minimal additional works prior to the initial commissioning process. This reduces the need for “hot works” and the number of staff required on site, and any potential health and safety hazards. Additional benefits of off-site construction are the reduction in the number of deliveries to a restricted location, meaning there is also less noise and pollution on site.


20 BUILDING SERVICES & ENVIRONMENTAL ENGINEER OCTOBER 2020 Read the latest at: www.bsee.co.uk


This in turn reduces the impact on the local area during the construction programme, as well as the risk of damaged goods by working within a controlled environment off site. Pre-packaged plant rooms can be produced in any size, from small single section enclosures up to ‘multi-module’ containerised enclosures up to 40m long and 20m wide.


The plant room at Wembley Hill Road incorporates a highly efficient, Energimizer EM50HNG Combined Heat and Power (CHP) unit. The EM50HNG CHP has low NOx exhaust emissions at (<35mg/kWh) and, at 54 dB(A), runs very quietly. This “lead boiler” delivers a constant 90 kWth of thermal heat into a 7,500 litre thermal store, providing instantaneous space heating and domestic hot water services up to each apartment via the Evinox “ModuSat” heat interface units while generating 50kWe co-generated electricity for on-site services, reducing the need to purchase costly electricity from the grid. Operating a 50 kWe CHP unit for more than 6000 hours per year can generate estimated annual savings of c. £29,000 for the building’s owners, along with CO2 savings of 92,725 kg.


Combined Heat and Power (CHP) is a cogeneration technology that generates electricity while producing hot water. CHP units consist of an internal combustion engine connected to a generator combined with efficient thermal heat exchangers. Fuelled by natural gas, LPG or biogas, Helec CHP units provide reliable on-site cogeneration of electricity and thermal heat, helping to optimise energy consumption and lower CO2 emissions.


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