HVAC controls have existed for a while. The first thermostat was patented in 1883! In the past era classrooms were heated by hot air furnaces operating in the basement of the building. School custodians controlled the heat through handoperated dampers based on periodic assessments of the classroom temperature.
The technology for automated room temperature control has existed for 135 years! Has much changed in the basic temperature control architecture during that span of time? Sadly, we could say, not really. Even today, data from a single temperature sensor controls the actuation of most HVAC units in homes.
“Smart” thermostats represent a very recent innovation, at least compared to the 135-year history. What makes a thermostat “smart”? Programmable schedules and vacation modes? No. Internet connectivity? Not enough. In one definition, “smart” thermostats must have more than two-way communication based on specially designed “algorithms”.
AI and IoT interplay in HVAC
The decoupling of the “algorithms” from the on-site thermostat control allows us to visualise the interplay between Artificial Intelligence (AI) and Internet of Things (IoT).
IoT driving 3rd-party application layer
Assume, for example, that a thermostat (basic or “smart”) exists in a home. Regardless of the actual thermostat capabilities, a Cloud-based AI analytics engine can implement HVAC “algorithms” in a third-party application layer.
Where to from here
Let’s take this inquiry further. Would the existence of IoT sensors lead to the development of AI analytics engines? Or, would the existence of AI analytics engines lead to the installation of IoT sensors?
Many companies have placed their bets on this question. Certainly, the investment community has weighed in as well. It isn’t quite a chicken and an egg problem, but it does reveal the interplay between AI and IoT.
Under this theory, the existence of IoT data would lead the way for AI. Regardless of the theory, IoT represents a key technology building block. IoT is necessary, but not sufficient.
Let’s find out how the relative industries of AI and IoT will play out.
AI technology is having an impact within the HVAC industry. Technologies that will affect these areas include expert systems, neural networks, intelligent computer aided design (ICAD), fuzzy logic and artificial reality. Expert systems are computer programs that mimic a human expert. Neural networks are computer programs that are designed to operate the way neurons operate in humans. Fuzzy logic is useful when the correct response is somewhere between a yes or no because it can represent concepts such as almost, all, most and others. Artificial reality is a technology that allows users to project themselves into a computer generated 3-D simulation. These technologies will be designed into HVAC field applications in the next few years as computer processor power increases and hardware costs drop.
Automation, AI, and the Changing Role of Building Managers
Building automation systems have been common for decades, providing comfort and achieving energy efficiency by managing HVAC, lighting and other systems. These on-premise technologies have made facility management a more productive, effective and enjoyable job.
Moreover, automation in buildings provides capabilities that aren’t feasible for a human to perform effectively. This was true when Warren Johnson (founder of Johnson Controls) patented the thermostat in 1883. Johnson didn’t like the disruptions in his classroom when janitors and other staff came in to check the temperature.
Across the broader economy, there continues to be concern that advanced automation technologies will destroy jobs. Now, productivity continues to rise while wages are stagnant. Many believe technology and automation are to blame.
Are these wider economic trends relevant to the building and real estate industry? What does a similar analysis of job growth indicate?
Three of these positions have shown healthy growth in employment over the past 15 years. The number of HVAC mechanics and installers has increased from 197,930 in 2000 to 294,730 in 2016, a growth rate of 2.5 per cent per year. Security and fire installation employment, a much smaller employment group, has grown more significantly, from 38,810 in 2000 to 67,700 in 2016 (a growth rate of 3.5 per cent per year). Employment in construction and building inspection also has grown over this time, from 68,690 to 94,960 (a growth rate of 2 per cent per year).
At the same time, there has been a slight decline in HVAC maintenance, from 59.8 per cent to 57.2 per cent. With around 5.5 million commercial buildings in the U.S., a 2.6 per cent decline means that many buildings no longer conduct routine maintenance. That alone should lead to a reduction in total HVAC employment, because it is a very manual service- and human-driven job. However, the exact opposite is happening: There are many more HVAC installers and maintainers.
Reports state that more buildings are cooling their floor space: The per centage of space that is not cooled has dropped from 23.6 per cent in 1999 to 19.7 per cent in 2012. And, the per centage of space that has 100 per cent of the floor cooled has increased from 38.6 per cent to 43 per cent. Overall, it seems that the increase in HVAC penetration and the increase in BAS penetration are driving higher employment, while the reduction in HVAC maintenance may be due to more reliable equipment that requires less ongoing service.
Based on these reliable data sources, it appears that buildings are being automated and employment in the industry is growing. Moreover, beyond raw employment numbers, other key trends are starting to impact building operations. First, the roles themselves are changing.
The report also notes that while some tasks will be automated, others will simply become more analytical or change in other ways. It’s safe to assume that with the substantial increase in data from buildings, many of the roles operating and maintaining them will become more data-driven. Moreover, the International Facility Management Association and Royal Institution of Chartered Surveyors released last year the third edition of a report focusing on the talent gap in facility management. The high-level findings are that the industry needs an influx of young, new talent (more RICS members are over 70 than under 30).
Facility management employment continues to grow, as does demand for advanced technology in buildings. A recent study commissioned by Dell and Intel found that 44 per cent of employees think their office is not smart enough, and 57 per cent believe that within five years, they will be working in a smart office. Dell and Intel include an IoT-enabled workplace in their definition of a smart office.
For now, it does not appear that automation will lead to significant job losses in the industry. However, facility and building managers need to address other, more critical issues, such as training employees to be prepared to use rapidly advancing technology and attracting more talent to the industry.
Using AI to Optimise HVAC is extremely easy
Heating, venting and air-conditioning may not be a rosy application of artificial intelligence, but there is huge cost-saving potential in using AI in HVAC.
AI seems to be everywhere. It’s been tested and has proven efficient by using AI to play backgammon, chess, the game of Go and even Atari games. In some ways, AI is catching up and overtaking us. One AI application that may not sound rosy, but where there is huge potential to apply AI is the field of HVAC – that’s right heating, venting and air-conditioning. HVAC systems are underappreciated technologies. They fall into the category of technology that a person uses every day and would hate to live without.
So, is there a way to apply the same smart control algorithms that have proven efficient in playing games to a commercial HVAC system that requires coordination of hundreds of control loops? To answer this, let’s start with simulation.
The goal to creating an HVAC simulation and eventually applying AI is to reduce the amount of energy used, the cost of energy and peak demand – the period in which energy is expected to be consumed at significantly higher than average rate. Depending on the local utility, the price of energy for commercial buildings changes depending on time of day and season.
Times of peak demand are often the most expensive times to use energy and occur during the hottest hours of the day – when HVAC is needed the most. Some utilities also use a building’s highest peak in energy usage to set rates and apply costly demand fees. The capability to optimise the amount of energy used, the amount spent on energy and energy used during times of peak demands will greatly impact operating costs.
In the outlined simulation, the following is taking place:
The model considers the whole building as a single zone, in which the building façade, the internal air, the furniture, etc., are always in thermal equilibrium.
The thermal loads on this zone are treated as signals that generate from stochastic processes.
The stochastic processes and the parameter values of the thermal model are chosen to correspond to a realistic building.
The HVAC power is the product of the absolute value of the HVAC thermal load and a cooling or heating factor.
The cooling factor changes with outdoor air temperature (OAT) in a threshold linear equation.
Like riding a bicycle, controlling room temperature is almost similar to controlling speed when riding a bicycle. Considering the simple thermal model presented here, the dynamic equations of the two problems are almost identical.
In the case of riding a bicycle, many forces change the speed of the bicycle. When you pedal, there is a force pushing the bicycle and the rider forward. There are also various other forces, such as friction and gravity, pulling the bicycle backward. When these forces add up to zero, the bicycle travels at constant speed.
In the case of HVAC systems, there are a number of thermal loads that change the temperature of a room. The HVAC system usually blows cold air into the room and decreases the room temperature. There are also several other thermal loads, such as human activity and solar radiation, that increase the room temperature. When these thermal loads add up to zero, the room temperature is fixed.
Imagine that you are riding on the road with downhill and uphill grades. Will you ride at constant speed? Probably not. You will ride faster going downhill, building up that kinetic energy for the subsequent uphill. Considering this, why would you want to keep our room temperature fixed? If only we can give a comfort range to the room temperature setpoint then we can catch up on the downhill and uphill of the thermodynamics of the room as the outside air temperature and various thermal loads change throughout the day.
This room temperature “comfort range” is very different from the “dead band” commonly implemented in VAV boxes. The VAV box is the centrepiece of a Variable Air Volume (VAV) system that changes the air flow rate based on the local room temperature and, usually, a pair of setpoints. The “dead band” prevents the VAV damper from actuating all the time. A smart control algorithm can actively optimise the room temperature setpoint within the comfort range, but the actual room temperature is still free to wander within the “dead band” cantered at the optimised setpoint at any point in time.
Energy saving can be achieved by widening the “dead band”, but without optimisation, the room temperature may go against the thermodynamics of the room wasting energy overcooling or overheating. This is the equivalent of trying to ride the bicycle slower going downhill, but faster going uphill.
Results from the simulation shows that room temperature optimisation has a great potential to improve HVAC efficiency. The simulation period is a whole year and the following three-room temperature control strategies are compared with each other.
- Fixed at 22-degree C (71.6-degree F)
- Fixed at 23-degree C (73.4-degree F)
- Optimise between 21-degree C (69.8-degree F) to 23-degree C (73.4-degree F).
The above graph shows the results of the simulations using three different control strategies. With optimisation, the monthly HVAC energy savings range from 5 per cent to 24 per cent from month to month. The greatest savings are achieved when the building requires some heating and some cooling on the same day. This is to be expected. As the smart control is put to work, some heating is reduced in the morning and hence there is less of a need for cooling later in the day – just like riding a bicycle.
Smart control strategies are cool (or hot)
Diagnostics help to make sure that the HVAC system can deliver a prescribed room temperature setpoint in the most efficient way. This step should come before room temperature optimisation and continue to monitor the building throughout. Comfort voting application helps to adjust and widen the comfort range improving comfort, providing more ‘room’ for the optimisation and hence saving more energy
SAT/SAP optimisation also contributes to energy saving but it is not necessary for room temperature optimisation to work in a variable air volume system. This is equivalent to changing gears on the bicycle: even without changing gears, we can still optimise our speed based on terrain.
AI fault detection for HVAC
The system also warns if target temperatures for heating or cooling are not achieved in a specific time frame.
The key to reducing costly HVAC repairs comes from knowing when those systems are performing inefficiently. Something as simple as low refrigerant levels in an AC system can lead to repairs or replacements costing several thousand dollars – not to mention the wasted electricity. This monthly subscription microservice can potentially save consumers big money on repair and energy costs, while functioning quietly in the background of their lives with 24-hour protection.
In addition to knowing when HVAC has not reached thermal targets within learned time period, the HVAC Fault Detection Microservice benefits include:
- Sending in-app notifications and email alerts of problematic performance issues
- Notifying customer support or repair services during warranty coverage period
- Integrating with professional monitoring call centres for value-added services
- Reminding users of manufacturer recommended service and filter replacements
- It is compatible with a wide range of connected thermostats
- It works with a variety of other People Power energy microservices.
Future of HVAC is AI and IoT? –
AI will play a large role in the era of Big Data. There is no doubt because the future of HVAC reveals AI and IoT. The debate about IoT market strategies will continue because of the expansive, even wild projections for the IoT market. Unfortunately, hype leads to myth, and myth leads to confusion. Moving forward means taking a step back to look for clues about how the IoT market could evolve.
3 ways AI is making buildings smarter
The future of AI in buildings is bright, but humans will always be needed to properly utilise and direct the technology.
To most individuals, commercial buildings are viewed as brick and mortar, static structures.
There is, however, a complex technological side to commercial buildings—from the software platforms that control elevators to smart lighting—that is often overlooked.
It is these features that underscore how commercial buildings can benefit from disruptive technologies like AI.
Falling costs, increased accessibility, and greater sophistication of IoT devices have made it easier to generate data on the performance of buildings, and the systems within them, on a more granular level.
At its core, IoT enables different components to communicate with each other, without any intelligence. The lack of intelligence means that a building may generate a deluge of data that needs to be manually sifted through to glean operational insights.
This has created a prime opportunity to apply AI to turn data into actionable information. Without AI, the combing of data from a building is either time-consuming or deemed useless information.
As AI continues to infiltrate the market, below are three ways in which it can be used to make buildings smarter.
- Predictive Energy Optimisation
When it comes to reducing energy consumption, buildings are reliant on after-the-fact reporting, essentially analysing what energy was used and then implementing a change in the hope that less energy will be used next time.
Let’s use the optimisation of heating and cooling within a building as an example.
Controlling room temperature within a building is like controlling speed when riding a bicycle. Many forces change the speed of a bicycle when it is in motion.
Pedalling creates a force that pushes the bicycle forward. There is also friction, gravity, and other forces working to slow the rider down. The bicycle travels at a constant speed when forces used to propel the bicycle forward are in equilibrium with the forces acting to slow it down.
In the case of a heating and cooling (HVAC) system, there are numerous thermal loads that influence the temperature of a space. To cool a room, the system blows cold air into the space to decrease the temperature.
However, other thermal loads such as human activity, solar radiation, and heat from electronics increase room temperature. When these loads add up to zero, the room temperature is fixed.
Imagine that you are riding a bicycle on the road with uphill and downhill grades. Will you ride at a constant speed? Probably not. You’ll build up kinetic energy (pedal faster) to go up a hill and perhaps coast going downhill.
AI-based energy management platforms can identify the “uphills” and “downhills” for building operations by applying AI in the form of machine learning to advanced models of a building’s thermal characteristics.
It will identify when it makes sense to precool the building to avoid energy use during hours when energy is at the highest price (the uphill), or when to decrease cooling due to periods of inactivity within a building based on historical usage patterns (the downhill).
This is all achieved while keeping temperatures within a range that is comfortable for building tenants.
- Preventative Maintenance and Fault Detection
In addition to optimising day-to-day operations, AI and machine learning can be relied upon for fault detection. AI techniques are well-suited in learning the relationship between input and output variables using only data, without mathematical models.
This technology can excel at analysing data from various systems and IoT devices within a building to identify anomalies and inconsistencies. After identifying these symptoms, AI can be used to target a diagnosis.
It’s also important to note the limits of AI. While at its core, fault detection is a technical problem – that AI can help expedite – human intuition and expertise is still needed.
In an ideal world, data anomalies would be automatically detected by AI-algorithms, and then immediately triaged and to identify the root cause.
However, within a building there is a deeper issue of resource constraint. There are often a lot more subtle and qualitative aspects to detection issues that require a person to filter.
Cost, ROI, and available funds must be considered from a budget perspective. There could be 10 -20 items on a list that have good ROI and comfort impact, but AI is not going to know that a room needs to be operating for an upcoming event or that a department is out of town, so prioritising that section of a building won’t cause a disruption.
For these reasons, the combination of AI within a building, paired with a national operations centre (NOC) to filter the qualitative needs of clients is the best strategy for resource-constrained facilities.
- Improving Tenant Comfort
Using AI to optimise building operations and prevent faults will inherently create a more comfortable environment for tenants.
Exploring the relationship between comfort, direct tenant feedback, and AI is perhaps one of the more recent developments in smart buildings.
Companies are actively racing to find the best ways to personalise comfort for individuals within a shared workplace. While there is no clear-cut path to how this will develop in the future, it is certain that humans act as the ultimate sensor within a building.
Thus, integration of mobile apps – and perhaps wearables – will likely have a large role in the way tenants interact with buildings.
As previously mentioned, AI can be used to refine advanced models of how a building performs based on a variety of variables. Using an app or other feedback mechanism for tenant input could potentially be another data stream to improve that model.
This is an early concept, and it is still unknown what this might uncover or in what way it will impact how smart buildings are operated. The goal of any smart building is to create a better experience for those within it, which makes tenant feedback vital.
The future of AI in buildings is bright but human expertise will always be needed to properly utilise and direct the technology.
The building space has been traditionally slow to adopt new technologies but embracing AI-based solutions is inevitable as it capitalises on the boom in the adoption of IoT-driven devices within facilities.
Building intelligence into buildings
What if buildings owners could see exactly how their building is being used at any given time? What if they knew how many people are using each room? How much energy is being consumed through heating, air conditioning or lighting? The condition of the drainage system, electrical equipment and elevators?
With AI, data from IoT devices, and occupant behaviour, this information becomes available to us. Digital devices, beacons and even social media statuses give insights into every aspect of a building’s condition and operation. This can span from infrastructure, climate, water and energy use, to an individual occupant’s experience. Moreover, smart buildings can use this information to automate building systems, to respond to changing external and internal factors.
Because of this, intelligent buildings have the potential to increase operational efficiency, improve occupant experience, and optimise space and asset use.
To increase operational efficiency in a meaningful way, we should monitor and optimise all aspects of facilities management. This includes water and energy use, as well as access and security. For example:
- Water: manage water use and flow with sensors and smart meters
- Fire: protect buildings from fire with automated functionality checks and smart detectors
- Energy: prevent waste and drive down costs with smart meters and demand response
- Elevators: remotely monitor performance and automatically schedule maintenance in response to fault detection
- HVAC: HVAC units can respond to occupancy data and automate fans, air availability and variable air volume
- Parking: sensors can monitor available spaces and enable 24/7 parking lot utilisation
- Access and security: connected cameras, instrumented perimeter doors and floor occupancy data help keep your building secure Real-time data from sensors and IoT devices within the building’s assets and infrastructure is the cornerstone of intelligent building management. Once we collect this information, we can cross-reference it with benchmark data and conduct analysis to identify operational improvements. For example, water flow sensors could trigger an alert when water pressure exceeded normal operating limits.
Analytics and artificial intelligence also allow building owners to significantly cut energy consumption and reduce operating costs. When sensor-data from the building itself is combined with external data sources, the potential for increased efficiency grows even more. For example, by combining heating and cooling data from the building with Weather Company forecasts, a connected HVAC system can offer more efficient heating and cooling.
Improving occupant experience
Optimising space and asset use
Build intelligence into your buildings: how to get started
- Which areas will bring the most return on investment quickly?
- What opportunities do I have to drive down operation costs and improve workplace experiences?
- In which situations can my buildings operate and manage themselves?
You could also start with individual processes. You might:
- Optimise maintenance by using predictive analytics to expose faults and determine their cause and impact. Automate device responses to handle this process proactively.
- Integrate sensors, devices and data to make more informed energy decisions.
- Enhance the occupant experience by introducing workstation availability apps with sensor and beacon devices to help occupants locate available space.
How Smart building is taking operational and energy efficiency to the next level
- Within a couple of years, smart building technology delivers greater returns in terms of energy saving and cutting operational costs against what you invest.
- Technologies like AI and IoT once deployed require minimal to no technical skills for facility managers as it takes a lot of decisions itself and shows you all the reports and suggestions in a highly intuitive and interactive dashboard. In fact, it becomes easier than before to optimise building operations, resolve a recurring equipment malfunction, and reduce carbon footprint since more information is available with a smart building solution.
- While the features of smart building and green building may overlap, they both are not identical concepts. Smart building solutions focus on monitoring heating, air conditioning, lighting and other systems to derive usage patterns and take predictive actions to optimise usage and save energy. A smart building solution, also known as connected buildings also focus on improving the experience and comfort of those within a building. On the other hand, green buildings are sustainable buildings that have a minimal impact on the environment, which help us to preserve most of the natural environment around the building. LEED is one of the most widely known green building rating systems, which provides a framework to build highly efficient and cost-saving green buildings. In case of green buildings, the construction and operation promote a healthy environment across different areas like water, land, energy and other resources.
- No, that’s not the case. Even though old buildings may be using pneumatic and analog technologies, smart building solutions can be implemented in old buildings through the use of effective retrofit technologies. By embedding sensors and connecting via gateways, data can be sent to the IoT cloud for further processing and to generate intelligence.
- There are a number of smart home applications based on IoT and AI; however, it is not limited to residential facilities only. All types of buildings – be it commercial or residential – can be retrofitted or built to become smart and highly automated using IoT and AI.
To achieve a low carbon economy, it is important that we adopt new technologies and make every possible move to make the world a better place. Smart buildings are definitely one of the ways to conserve energy by optimising systems and automating controls. If you have any questions about smart buildings, please feel free to get in touch.