November 2020
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Retrofitting Building Controls:

Reduce carbon emissions and save costs

For complete article click here


Chris Irwin | J2 22 Oct 2020


retrofitting blog-1

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As the scale of the global climate crisis becomes clear, there is much talk about de-carbonization of heating and net zero building construction. Whilst making radical improvements to the building regulations that govern design and construction of new buildings is crucial, it’s not enough. For one, most of the buildings that will be around in 50 years have already been built, so the impact of net zero buildings on energy usage will not be as much as we need. Also, most existing buildings are poorly managed (from an energy usage perspective), leading to massive amounts of waste. Its a similar situation to that faced by the food industry; there have been huge strides made in the efficiency of food production, but this is negated by the amount of food that goes to waste, either left to rot or thrown away by consumers who over-purchase. Tackling waste is hard; there is no single fix, but it is well established that by upgrading the controls on a building, significant energy savings and operational benefits can be made.


In homes, the installation of smart thermostats to 
control central heating is one of the most obvious steps, as well as fitting smart radiator thermostats that can reduce waste room by room; devices such as the Radbot smart actuator offer a savings of over 20% with a payback of less than 2 years! In small commercial buildings the percentage savings that can be made are often greater, since many have inadequate controls and little or no management of the configuration and settings required to optimize them. Whilst many building owners and operators, such as major retail and leisure chains, have made investments to reduce the waste of energy, the vast majority of smaller buildings have yet to be tackled.


RetroFit_radiator

The two fundamental problems faced by organizations wanting to provide solutions is how to persuade the building owner/operator of the benefits and how to get them installed and commissioned cost-effectively. Until now, the cost of installing fully programmable building management systems with sophisticated features for logging the environmental data and reporting on it, as well as algorithms to optimize control, has been too high for the majority of smaller buildings. The complexity of installation and commissioning also tends to be beyond the competencies of the contracting channels that install the HVAC and lighting equipment. A third, very practical issue, is that retrofitting additional sensors and control devices into an existing occupied building is relatively expensive (compared to installing in new buildings), because running cables around internal spaces is disruptive to occupants and must therefore be carried out after opening/working hours.

The situation is not all doom and gloom though. Equipment manufacturers have, in recent years, been fitting more “intelligent” controls to their heating and air-conditioning products. Unfortunately, these typically only control the suppliers own equipment. This does not help deliver an easy-to-manage, overall site solution. No user wants to juggle multiple user interfaces and smartphone apps just to manage their building, which is why a more holistic solution is needed.

Another positive change over the last 5 years or so has been the wider availability, and falling costs, of wireless devices that can reduce the installation time and disruption to operations. The newer wireless protocols such as LORA offer a better balance of range reliability and battery life than previous generations, making these a far more attractive proposition for retrofit solutions. Far less common are wireless control modules for switch lighting and other electrical loads such as door curtains, VRF units etc. but these are also very useful in reducing on-site costs.

Another problem that multi-site building operators face....................

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