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

[Audio] Good morning everyone, Today we are discussing the analysis of the Low Carbon Building Services for a mixed multistorey building in an urban area. Throughout this presentation, we will compare a baseline and low carbon scenario to evaluate the cost, carbon emissions, and energy consumption. Let's get started..

[Audio] Good morning class. In this slide, we are summarizing our upcoming exercise on Low Carbon Building Services. We will look at the baseline scenario, the low carbon scenario, a comparison of both of them, an assessment of strengths and weaknesses of the different technologies involved, an overall evaluation, and finally some steps to move forward with further feasibility analysis. So let's get started..

[Audio] Now let's have a look at this slide. This slide provides us with some information about the site of our Low Carbon Building Services project. As you can see, we are dealing with a mixed multistorey building which consists of 47 residential units and one library. It is located in an urban area, assumed to be in Hong Kong. We do not know yet the size of the plantroom and roof top space available. The next three tables provide us with some energy consumption data. We can see that the annual consumption for residential units includes 144000 kWh for cooling, 58000 kWh for hot water, and 87000 kWh for other electricity use. On the other hand, the commercial unit annual consumption comprises 332000 kWh for cooling, 133000 kWh for hot water, and 199000 kWh for electricity without cooling. Lastly, we can calculate the total annual energy consumption which amounts to 476000 kWh for cooling, 191000 kWh for hot water, and 286000 kWh for electricity without cooling..

[Audio] For this slide, our baseline scenario consists of electrical heaters providing all hot water demand, with 5% of the total demand being provided by solar thermal energy. For cooling, standard air conditioning units with a coefficient of performance of 3.0 will provide all the cooling demand. Finally, all electricity demand will be met by grid electricity, including the electricity demand to provide cooling..

[Audio] As you can see from this table, we can see the breakdown of the cost and carbon emissions associated with the different building services of the UBLMN7-30-3 Low Carbon Building Services. Specifically, we can see that the cost and carbon emissions of electricity usage are 1.3 dollars per kWh and 0.65 kgCO2 per kWh. The cost and carbon emissions of town gas usage are 0.3 dollars per MJ and 0.0119 kgCO2 per MJ. Additionally, the cost and carbon emissions of hot water, cooling and electricity cooling are detailed. This information will be useful in evaluating the environmental performance of the building services..

Low Carbon Scenario (Option D). Cooling : Absorption Chiller to provide cooling providing all cooling demand Hot Water : 65% Gas CHP of heat for hot water + (35% Grid Assumed) Electricity : 30% Gas CHP( + 70% Grid Assumed).

Low Carbon Scenario (Option D ). Heating and Cooling : Absorption Chillers to provide cooling and heating.

[Audio] For option D, the hot water demand of the building is met by 65% efficiency gas CHP, while the remaining 35% grid electricity is also utilized. In terms of cost, the total expenditure is around 221000 Dollars, and the total carbon emission is estimated to be 48,772 kilograms of CO^2. This is a good low carbon building service option which effectively reduces overall costs..

Low Carbon Scenario (Option D). Electricity : 30% Gas CHP+ 70% Grid.

[Audio] This slide provides a side by side comparison between Baseline and Low Carbon scenarios, which reveals that adopting the Low Carbon scenario gives 39% lower costs in monetary terms, and 15.8 % lower carbon emissions. The comparison is presented in tables, which show that Low Carbon makes a lot of sense from both economic and environmental perspectives..

[Audio] We are looking at a SWOT analysis for absorption chillers and their efficiency in providing cooling solutions. Strengths include energy efficiency and cost savings, while weaknesses include higher initial cost and lower cooling capacity. We are also analyzing the opportunities, such as integrating with renewable energy sources, and possible threats, like competition from vapor-compression chillers. By assessing this analysis, we can decide how to move forward with our cooling solutions and ensure we make the right decision for our building services..

[Audio] We are examining the Low Carbon Building Services set exercise, focusing on gas CHP hot water systems. A SWOT analysis has been conducted, highlighting the Strengths, Weaknesses, Opportunities and Threats of using a gas CHP system. Advantages include energy efficiency, cost savings and reliability, though an initial investment and technical complexity is required, as well as dedicated space for installation. Notwithstanding, there is growing demand for energy efficiency and changes in natural gas prices could negatively impact the cost-effectiveness and attractiveness of gas CHP systems..

[Audio] The slide before us gives a SWOT analysis on Gas CHP -Electricity. It has benefits like energy efficiency and environmental friendliness, but also drawbacks such as high upfront cost and technical complexity. This information can enable us to comprehend how it operates and aid us in making a knowledgeable choice..

[Audio] When looking at the possibility of utilizing a Gas Combined Heat and Power (CHP) system, multiple factors need to be considered. In order to make the most efficient and cost-effective decision, the initial investment, operational costs, energy prices, and potential incentives or government programs must be evaluated. Additionally, the space availability, technical requirements, and environmental impact must all be taken into account..

[Audio] In the feasibility analysis for installing a gas CHP system, it is necessary to analyze the technical requirements. Factors to consider include if the existing infrastructure such as gas supply, electrical connections, and plumbing are adequate, how much space is needed for the installation, and whether the expected energy outputs are sufficient to meet the building's energy demand..

[Audio] In order to conduct a feasible analysis of absorption chillers, a few considerations should be taken into account. Firstly, what is the cooling requirement for a particular residential or commercial property? Secondly, what energy sources are available to provide energy for the absorption chillers, such as natural gas, waste heat, or steam? Thirdly, what is the cost-benefit analysis of choosing absorption chillers in comparison to other cooling technologies?Fourthly, what is the cooling efficiency of absorption chillers, as measured by the Coefficient of Performance? Lastly, what potential risks or obstructions might appear when implementing absorption chillers, and what contingency plans are in place to address them? Considering these points, it is possible to evaluate the feasibility of absorption chillers for the given property..

[Audio] By implementing UBLMN7-30-3 Low Carbon Building Services, our goal is to reduce energy consumption in a building. This goal can be achieved by reducing the number of components used in the building, such as cooling, electricity, and hot water. To get maximum efficiency, we need to analyze when and where to install these components. For example, installing them in the residential or commercial parts of the building could both be beneficial. Finally, it is important to calculate how much each energy component could save us in terms of energy consumption..

The end. Thank you.