Building Envelope
A building envelope is a physical barrier separating a structure's unconditional and conditional environments. One of the most important components of climate change mitigation is the building envelope. Building envelopes for smart buildings are made of materials like advanced membranes, vapor barriers, phase change materials, dynamic glazing, high-performance insulation, and high-performance cladding. In the study, 50% used dynamic glazing systems, 20 % of the building made use of high-performance cladding and 30% of the building used sustainable and recyclable materials as shown in Figure 1 below. These materials capture useful daylight while reducing glare and unwanted solar heat gain, allowing them to adapt to the outside environmental conditions and user requirements while providing higher energy performance. By doing this, the building's CO2 emissions are decreased and the amount of energy used is decreased. According to respondents, the building envelope is crucial to achieving effective climate change mitigation as the design provides comfort without the use of mechanical aid that can contribute negatively to the environment.
Building envelope contributes significantly to energy efficiency and the overall reduction of greenhouse gases. It is also a key factor that determines the quality and control the indoor conditions irrespective of transient outdoor conditions. This was supported by 80% of the respondents as it was equally noted that smart building envelopes demand lesser heating and cooling systems because the building envelopes in place lower the overall energy usage and associated greenhouse gas emissions. Respondents also noted that by implementing high-performance materials, and innovative technologies, for the building envelope, the building contributes to energy efficiency, thermal comfort, and sustainable building practices, thereby addressing the environmental impact of building operations. This was stated by some of the respondents.
Respondent 17: Smart building envelopes often incorporate a variety of advanced materials that help optimize energy efficiency, occupant comfort, and overall building performance.
Respondent 23: the glazing solutions as a building envelope in smart buildings can adapt to changing external conditions while enhancing occupant comfort.
Respondent 6: The material used as building envelope in smart buildings often helps to improve thermal inertia and reduce temperature fluctuations
However, 10% of the respondents disapproved of the notion that building envelopes lower greenhouse gas emissions in buildings. Other factors like the type of sizes windows and orientation of the building are the major considerations. Even though these factors also contribute to energy efficiency in buildings, the material and method of construction of building envelope is a major contributors to whether there will or will not be greenhouse gas emissions in buildings. Also, respondents fail to understand that the window is a part of the building envelope. Besides, through the use of high-performance insulation, advanced glazing systems, airtight construction, and thermal bridging mitigation, smart buildings optimize the building envelope to minimize heat loss during colder months and heat gain during warmer months.
Furthermore, the nature of the material used for smart building envelopes is durable and long-lasting. The materials are built in such a way that they minimize the need for premature replacements or major renovations. By extending the lifespan of building elements, smart buildings reduce material consumption, construction waste, and associated environmental impact, contributing to sustainable building practices and mitigating climate change. 90 % of the respondents noted that smart building envelopes reduce the emission of greenhouse gases because the materials align with green building standards and support sustainable construction practices. The building envelope in smart buildings integrates with advanced building management systems to continuously monitor and optimize its performance.
Renewable Energy Integration
Renewable energy sources play a pivotal role in powering smart buildings, enabling them to operate efficiently, sustainably, and with reduced environmental impact. It was observed from the study that 60 % of the building is powered by solar while 40% is by geothermal energy as shown in Figure 2, which are all renewable energy sources. The solar energy system utilizes solar panels to convert sunlight into electricity while geothermal energy is used for heating and cooling, providing a sustainable alternative to traditional HVAC systems. Respondents opined that most of both sources of energy emit far lower carbon dioxide than those produced by other renewable and fossil-based energy.
The integration of renewable energy in smart buildings contributes significantly to the reduction in the emission of greenhouse gasses as these energy sources do not produce carbon emissions as part of the electricity generation process. Respondents equally noted that the integration of these renewable energy sources into smart buildings often involves advanced energy management and control systems to optimize their usage. However, some of the respondents believe that renewable energy cannot effectively mitigate the emission of CO2 causing climate change. This suggests that some of the respondents are not fully aware of the usage of renewable energy in advanced technology buildings. Renewable energy does not only reduce the emission of greenhouse gasses during the operational stage of the building it also aligns with broader sustainability goals of achieving net-zero energy or carbon neutrality as stated by some of the respondents which is achieved by combining robust building designs with efficient renewable energy systems,
Respondent 8: Smart buildings serve as examples of sustainable and environmentally conscious construction and operation practices.
Respondent 21: The increased investment in renewable energy contributes significantly to the larger goal of sustainable development.
The incorporation of renewable energy sources, such as solar power, wind energy, geothermal solutions, biomass/biofuels, and even hydroelectric power, into smart buildings is a major step toward lowering carbon emissions, promoting sustainable development, and mitigating climate change. Smart buildings demonstrate a commitment to environmentally responsible operations and serve as beacons of sustainable architecture and urban development.
HVAC System
HVAC (Heating, Ventilation, and Air Conditioning) systems are an integral part of the building that plays a pivotal role in maintaining a pleasant indoor environment. They are therefore designed to achieve the environmental requirement of comfort for the occupant while reducing the amount of energy used. Generally heating and cooling systems burn some types of fossil fuel for energy which leads to the emission of greenhouse gases. However, the situation is quite different with smart buildings as these buildings play a crucial role in mitigating climate change by lowering energy consumed in buildings. Smart building integrated smart HVAC systems such as variable refrigerant flow (VRF) systems, heat pumps, energy recovery ventilation, and advanced air handling units for controlling the heating and cooling system. The building examined shows that 40% of the buildings used a geothermal heat pump, and 60 % solar heating and cooling system, as shown in Figure 3. All these are smart HVAC systems that are integrated seamlessly into the building design.
Apart from the integration of smart HVAC systems, smart buildings use passive means such as operable windows and shading. These are intended to reduce solar heat gain and reduce glare. The respondents equally noted that, in addition to temperature control, operable windows offer free cooling and ventilation when the surrounding conditions are suitable. The ventilation guarantees the continuous exchange of stale indoor air with fresh outdoor air, eliminating pollutants, odors, and excess moisture. Ninety percent of those surveyed concur that having enough ventilation helps to keep pollutants like CO2 and volatile organic compounds from building up and causing climate change. On the other hand, daylighting which is a primary lighting source helps reduce lighting power by maximizing daylighting. In providing a visually comfortable indoor environment smart buildings promote the optimization of natural light levels and reduce dependency on artificial lighting that can lead to the emission of greenhouse gases. 75% of the respondents noted that the harvesting of daylight helps to maximize natural light utilization while minimizing glare and solar heat gain.
Smart buildings prioritize indoor air environmental quality through efficient ventilation, air quality monitoring, and optimized thermal comfort. By creating healthier and more comfortable indoor environments, smart buildings can reduce the overall energy demand for heating, cooling, and ventilation while enhancing occupant well-being. Adjusting the heating, cooling, and ventilation operations, in the building emission of greenhouse gases is drastically reduced. 85% of the respondents agree that addressing HVAC operational issues promptly, will lead to minimizing energy waste and contribute to sustainable building operations with reduced environmental impact.
Respondent 2: Controlling the humidity is responsible for roughly half of the energy related to emission while the other half is from controlling temperature.
Respondent 29: Smart buildings utilize sophisticated HVAC (Heating, Ventilation, and Air Conditioning) systems equipped with sensors and actuators to regulate indoor temperature, humidity, and air quality in real time.
Respondent 16: The advanced control adjust HVAC operation is based on factors such as occupancy patterns, outdoor conditions, and indoor air quality, ensuring a comfortable and healthy environment while minimizing energy consumption.
Additionally, according to the respondents, buildings should be designed to satisfy the needs of their users while also having no detrimental effects on the surrounding environment. Even though the concept of smart HVAC in smart buildings is not widely known, it is clear from the various responses given by the respondents that the concept of Smart HVAC can effectively reduce the emission of greenhouse gases from buildings through energy-saving even though it wasn’t clearly stated.
Advanced Building Automation
The automatic monitoring, control, regulation, and optimization of building equipment is known as a building automation system (BAS). Building automation, which integrates all facets of the building, is the most significant component of smart buildings, according to the cases studied. It combines energy management, fire safety, lighting, heating, ventilation, and air conditioning (HVAC) systems, and other building services into a single comprehensive system. In the building studied different BAS were integrated into the building however, their functions are alike. 20% of the buildings made use of BAS Metasys, 20% made use of BAS Varasys 30 % made use of BAS BCPro and 30 % integrated the BAS facility explorer for the building as shown in Figure 4.
The integration of BAS into the building makes the provision of information and communication possible for all sensors on a single platform. The information provided enables the owner to fully utilize their building and make informed decisions. Respondents noted that technology has opened a unique innovation door in building that can help in reducing the emission of greenhouse gases causing climate change.
Building Automation Systems (BAS) enhances the building's operational efficiency and offers a means of lowering resource and energy usage. According to the respondents, automation systems are essential for mitigating the effects of climate change because they read and control energy use in buildings. For instance, smart lighting automation enables you to monitor and manage the lighting system in your building through the use of a smartphone or online application. According to respondents, BAS is an effective means of reducing greenhouse gas emissions through proper monitoring of energy consumption.
Respondent 7: By ensuring that systems only run when necessary, automated scheduling reduces the amount of energy wasted during off-peak hours.
However, BAS extends beyond merely regulating lighting and temperature. Users can also track their energy usage in real-time with their energy monitoring and analytics capabilities. This data is helpful in pinpointing areas that require improvement and maximizing energy use. The use of Smart interfaces empowers occupants to provide real-time feedback on indoor environmental conditions, enabling them to communicate preferences or issues related to temperature, lighting, air quality, and comfort. Building management systems can use this feedback to iteratively refine environmental settings and ensure that occupants’ comfort needs are met on an ongoing basis. By addressing these factors, smart buildings help reduce the amount of greenhouse gases that a building emits while also promoting healthier and more comfortable indoor environments. Furthermore from the building analysis done, it was noted that apart from providing information on the energy usage BAS also facilitates quicker maintenance operation. Because these maintenance plans save replacement costs, and increase the equipment's lifespan.
Respondent 15: Users can better understand their energy usage patterns with real-time energy monitoring.
Respondent 28: Finding malfunctioning machinery or systems enables quick fixes, preventing expensive malfunctions.
Benefits of Smart Buildings in the Built Environment
In examining some of the benefits of smart buildings in the built environment the respondent was required to respond to questions to obtain their perception about the benefits of adopting the new form of building in the built environment. The result is presented in Table 1.0 where it appears to show the major benefit of a smart building is considered to be energy management and optimization three hundred and ten respondents strongly agree with the benefit
The weighted score of 1 to 4 was allocated to the rating options of adequacy based on the perception of the respondents regarding the variable measured;
Very Adequate 1
Adequate 2
Inadequate 3
Very Inadequate 4
Using the Likert scale of measurement, the mean calculation of respondents obtained from the analysis of the questionnaire is presented in Table 2.0 below.
1.0 – 1.49 Strongly Agree
1.5 - 2.49 Agree
2.5 - 3.49 Disagree
> 3.5 Strongly Disagree
In determining which benefit is considered the most accepted benefit the mean score for the selected opinions was calculated and it could be observed from Table 1.0 that energy management and optimization was considered as the most agreed benefit of smart building in the built environment with the mean score of 1.296. Table 1 also shows that variables regarding sustainable development and lowering of greenhouse gases were equally strongly agreed with, this shows that smart building reduces carbon emissions in building. This can also be interpreted that the reduction of energy use in buildings has a modest effect on carbon emitted to the environment. Again, apart from smart buildings lowering the emission of carbon which is a primary pollutant in the environment, it also focuses on preserving the environment which leads to sustainable development practice. In one of the interviews with the respondents, most respondents stated that smart building is one of the methods for sustainable development practice.
Respondent 15: through the focus on energy efficiency buildings become more sustainable
Respondent 23: the implementation of advanced building technology that manages energy consumption leads to sustainable practice.
The improved security was rated disagree with a mean score of 2.5573333 as presented in Table 1. Even though, the incorporated technology provides occupants with real-time information about their building. However, most respondents believe that security could be compromised and the use of a centralized network makes it harder to maintain control of the building. Other variables were agreed with. This shows that the adoption of smart buildings has a lot of benefits that could be harnessed for the betterment of the environment.
Table 1.0 Respondent opinion on the benefit of smart buildings in the Built Environment
Item Description
|
Strongly Agree
|
Agree
|
Disagree
|
Strongly Disagree
|
Total
|
Sum
|
Mean
|
Interpretation
|
Lowering of greenhouse gases
|
295
|
46
|
24
|
10
|
375
|
499
|
1.3306667
|
Strongly Agree
|
Improved indoor Air Quality
|
200
|
85
|
64
|
26
|
375
|
666
|
1.776
|
Agree
|
Adaptive and resilient infrastructure
|
254
|
60
|
32
|
29
|
375
|
586
|
1.5626667
|
Agree
|
Predictive maintenance and equipment optimization
|
190
|
85
|
34
|
66
|
375
|
726
|
1.936
|
Agree
|
Occupant center satisfaction
|
181
|
99
|
57
|
38
|
375
|
702
|
1.872
|
Agree
|
Acoustic comfort solution
|
176
|
100
|
52
|
47
|
375
|
720
|
1.92
|
Agree
|
Wellness and productivity of occupancy
|
203
|
130
|
16
|
26
|
375
|
615
|
1.64
|
Agree
|
Adaptive thermal comfort control
|
168
|
88
|
63
|
56
|
375
|
757
|
2.0186667
|
Agree
|
Energy management and optimization
|
310
|
35
|
14
|
16
|
375
|
486
|
1.296
|
Strongly Agree
|
Community engagement and education
|
173
|
102
|
67
|
33
|
375
|
710
|
1.8933333
|
Agree
|
Saving operational cost
|
157
|
100
|
47
|
71
|
375
|
782
|
2.0853333
|
Agree
|
increased assets value
|
191
|
57
|
89
|
38
|
375
|
724
|
1.9306667
|
Agree
|
Sustainable development
|
317
|
20
|
20
|
18
|
375
|
489
|
1.304
|
Strongly Agree
|
Improved security
|
67
|
120
|
100
|
88
|
375
|
959
|
2.5573333
|
Disagree
|
Carbon print tracking and reporting
|
167
|
85
|
70
|
53
|
375
|
759
|
2.024
|
Agree
|