UBLMN7-30-3 Low Carbon Building Services Set Exercise -Option D

[Audio] Good morning everyone. We are here today to discuss Uwe Chung Ka Kuen's presentation exploring a low carbon building services option for a mixed multi-storey building. We will compare a baseline with a low carbon scenario and evaluate the overall outcome. Let's begin with the first slide of this presentation..

[Audio] We will be looking at UBLMN7-30-3 Low Carbon Building Services. We will explore the summary of the site information, the baseline scenario, the low carbon scenario, a side by side comparison, a SWOT analysis by technology, and an overall evaluation, as well as the next steps for further feasibility analysis. Let's begin..

[Audio] The slide we are looking at depicts the total energy consumptions of a mixed multi-storey building. The table shows that the total cooling consumption is 476000 kWh per year, the total hot water consumption is 191000 kWh per year and the total electricity without cooling consumption is 286000 kWh per year. It is important to take these consumption values into consideration when planning and designing building services. Focusing on the total energy consumption allows us to plan, design and select the most suitable technology in order to reduce energy costs and carbon emissions..

[Audio] We are examining a baseline setup including hot water, cooling and electricity components. Electrical heaters with an efficiency of 95% are employed for hot water, supplemented by 5% from solar thermal energy. Air conditioning units with a coefficient of performance of 3.0 are utilized for cooling, and grid electricity caters for all electricity demand and even the electricity needed for cooling..

[Audio] Regarding low carbon building services, the data table presented indicates the cost and amount of carbon dioxide produced in relation to different energy sources. Electricity has a cost of 1.3 dollars per kilowatt hour and produces 0.65 kilograms of CO2. Town gas is priced at 0.3 dollars per megajoule and produces 0.0119 kilograms of CO2. For the building's hot water demand of 191000 Kwh, a gas boiler with 95% efficiency would have a cost of 197,581 dollars with 7,823 kilograms of CO2 generated; the grid would have a cost of 185,166 dollars with 7,345 kilograms of CO2 generated. If cooling the building, an air-conditioning unit with a COP of 3.0 would have a cost of 206,267 dollars with 103,133 kilograms of CO2 generated, or 578,067 dollars with 289,034 kilograms of CO2 generated via the grid with 100% efficiency. The information provided here should help to assess the cost and environmental impact of different energy sources..

[Audio] A low carbon scenario is our next slide topic. An absorption chiller is showcased as the cooling solution, with 65% of the hot water supplied by a gas CHP, as well as 30% of the electricity. The remaining hot water and electricity would come from the grid..

[Audio] Focusing on Low Carbon Scenario Option D, we will be examining the use of absorption chillers for cooling and heating. According to the table, total building demand is 476000 Kwh, while the absorption chillers with the COP 4.0 Demand is 119000 Kwh, costing 154,700 US Dollars. Carbon emission in KgCO^2 is 77,350. In order to gain a better understanding of absorption chillers and the advantages they offer in the field of low carbon building services, further discussion is needed..

[Audio] Without greetings, without beginning with "today" and without thanks: We will be discussing one of the low-carbon scenarios for hot water in buildings, Option D which consists of 65% gas Combined Heat and Power, and 35% from the grid. The tables show that when only using the grid, the total cost would be $86,905 and the total carbon emissions be 43,453 kgCO2. When combined with the gas CHP, the total cost increases to $220,987 and the total carbon emissions to 48,772 kgCO2. It is evident that using gas CHP to generate hot water requires more cost and results in greater carbon emissions..

[Audio] Our team has developed an innovative electricity generation system that combines 30% Gas CHP and 70% Grid power to produce electricity, cooling, and hot water. The Gas CHP technology is highly efficient and environmentally friendly. The Grid serves as a reliable supplement for peak demand. This approach is cost-effective and energy efficient, while also reducing pollution. Additionally, it offers us flexibility and resilience, ensuring uninterrupted power supply. As you can see from the tables, Grid with 100% efficiency Demand (Kwh) is 286000, 158,667 and 444,667 for electricity, cooling and total building demand respectively. In the second table, Grid with 100% efficiency Demand (Kwh) is 398,172 for total building demand. With our system, we can generate electricity, cooling, and hot water more efficiently and attractively..

[Audio] We compared the baseline scenario to the low carbon scenario in the UBLMN7-30-3 Low Carbon Building Services Set Exercise and reached some interesting findings. The low carbon scenario was the cost winner with 39% lower costs, while also being the carbon winner with 15.8% lower carbon emissions.This suggests that if we choose the low carbon scenario, it can bring us both cost and environmental savings. Examining the cost comparison table reveals the dollar figures and the carbon comparison provides the amount of carbon emissions. To sum up, the low carbon scenario is the more beneficial option in terms of both cost savings and green credentials..

[Audio] Absorption chillers are highly valued for their energy efficiency and environmentally friendly attributes. They are known to be more efficient than their counterparts and are powered by natural refrigerants which makes them a popular choice for those looking for a cost-effective solution. Moreover, they are known to require less energy and maintenance costs in the long run. These chillers are also very flexible, being able to use various heat sources. However, absorption chillers tend to be more expensive initially and require more space for installation, and have lower cooling capacities compared to vapor-compression systems..

[Audio] CHP systems, or Gas Combined Heat and Power systems, offer great opportunities for improving energy efficiency due to their high efficiency and potential for cost savings. Not only are CHP systems reliable, but installation requires a substantial initial investment and professional installation, maintenance, and monitoring. Despite this, growing awareness and concern for energy efficiency is presenting an opportunity for driving demand for CHP systems. However, this demand must contend with fluctuating gas prices which can impact the cost-effectiveness of CHP systems..

[Audio] Gas CHP systems boast numerous advantages. They are remarkably energy efficient, rendering less energy lost in generating electricity and heat than separate electricity generation and heat production. Additionally, they burn cleaner, lessening greenhouse gas discharges and the environmental effect produced by conventional electricity generation systems. The downside is that they necessitate a sizable initial cost, and specialized intricacy that necessitates expert installation, upkeep and observation..

[Audio] In order to make an informed decision about installing a gas CHP system, it is important to consider the energy demand of the property, the cost-effectiveness of the CHP system compared to separate hot water and electricity generation systems, and the available space for installation. It is essential to evaluate the initial investment, operational costs, energy prices and potential incentives or government programs to determine if the CHP system is the most suitable solution for the property..

[Audio] For this presentation, we will be taking a look at a Low Carbon Building Services Set Exercise. The next step in the further feasibility analysis involves technical feasibility. This includes determining what the technical requirements are for installing a Gas CHP system in residential or commercial properties, the compatibility of existing infrastructure such as gas supply, electrical connections and plumbing with a Gas CHP system, the required space to install the Gas CHP system and related equipment as well as the expected electrical and thermal energy outputs of the system and how they fit with the designed building energy demand. We will now proceed to examine these questions in more detail..

[Audio] Absorption chillers are an economical and efficient solution for cooling requirements. Before adoption, the cooling demand of the property, energy source, cost-benefit analysis, cooling efficiency and risk assessment should all be taken into account. To determine the viability of using an absorption chiller, the available energy sources such as natural gas, waste heat or steam should be considered, followed by a cost-benefit analysis comparing against other cooling technologies. The Coefficient of Performance (COP) should also be assessed, as well as any potential risks such as equipment failure, supply disruptions or changes in energy prices. To ensure a secure operation, any contingency plans which would address any potential risks should be put in place..

[Audio] Low Carbon Building Services strives to decrease utilization of power, cooling, and hot water in both residential and commercial properties. We can fit these services in the structure and work out the measure of energy one unit can save. This is an extraordinary method to cut down the carbon impression and save money eventually..

The end. Thank you.