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

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

Summary. -Site Information -Baseline Scenario -Low Carbon Scenario -Side By Side Comparison -SWOT Analysis(By Technology) -Overall Evaluation -Next Steps for further Feasibility Analysis.

Site Information. Mixed multistorey building : 47 residential units + 1 Library Mid to High Rise building Urban area (assumed ) ,location ( Hong kong is assumed) Size of plantroom and roof top spacer a vailed is unknown.

Baseline Scenario. Hot Water : Electrical Heaters at 95% efficiency providing all hot water demand + 5% from solar thermal energy Cooling : Standard Air Conditioning Units ( COP 3.0) providing all cooling demand Electricity : Grid electricity providing all electricity demand ,including the electricity demand to provide cooling.

Cost and Carbon $ kg CO2 Electricity 1.3/Kwh 0.65 kgCO2/kWh Towngas 0.3/MJ 0.0119 kgCO2/MJ of town gas.

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.

Low Carbon Scenario (Option D). Hot Water : 65% Gas CHP of heat for hot water + 35% Grid.

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

Side by Side Comparison. Key Considerations and Take Aways: Cost winner is low carbon scenario with 39 % lower costs Carbon winner is low carbon scenario with 15.8 % lower carbon emissions..

SWOT Analysis Absorption chillers - Cooling. Strengths Weaknesses Energy efficiency: Absorption chillers are known for their high energy efficiency . Environmentally friendly: These chillers use natural refrigerants Cost savings: Absorption chillers can provide cost savings in the long run due to lower energy consumption and reduced maintenance requirements. Flexibility: They can use various heat sources Higher initial cost: Absorption chillers typically have a higher initial cost compared to conventional chillers, which may deter some potential buyers. Larger space for installation: requiring more space for installation. Lower cooling capacity: Absorption chillers generally have a lower cooling capacity compared to vapor-compression systems.

SWOT Analysis Gas CHP -Hot Water. Strengths Weaknesses Energy efficiency: Gas CHP systems are highly efficient in utilizing energy Cost savings: CHP systems can provide significant cost savings by reducing energy Reliability: Gas CHP systems generally offer high reliability and uninterrupted hot water supply, especially when compared to relying solely on grid electricity or traditional water heating systems. Initial investment: The intital cost of installing a gas CHP system can be relatively high Technical complexity: Gas CHP systems require professional installation, maintenance, and monitoring Space requirements: CHP systems are larger than conventional water heating systems, necessitating adequate space for installation..

SWOT Analysis Gas CHP -Electricity. Strengths Weaknesses Energy efficiency: Gas CHP systems are highly efficient in generating both electricity and heat simultaneously, resulting in reduced energy waste compared to separate electricity generation and heat production. Environmental benefits: Gas CHP systems can help reduce greenhouse gas emissions and environmental impact by utilizing cleaner-burning natural gas and producing less waste heat compared to separate electricity generation. High upfront cost: By installing a gas CHP system can be relatively high Technical complexity: Gas CHP systems require professional installation, maintenance, and monitoring, which can be more complex and require specialized knowledge compared to traditional electricity generation systems..

Over All Evaluation. Energy demand: Assess the hot water and electricity demand of the residential or commercial property. Determine the required capacity for both hot water and electricity to ensure that the gas CHP system can meet the energy needs effectively. Cost-effectiveness: Evaluate the potential cost savings and payback period of installing a gas CHP system compared to separate systems for hot water and electricity generation. Consider the initial investment, operational costs, energy prices, and potential incentives or government programs that can reduce the financial burden. Space availability: Gas CHP systems typically require more space compared to individual hot water and electricity generation systems. Assess the available space for installation and ensure that it meets the requirements of the gas CHP system. Technical requirements: Gas CHP systems require professional installation, maintenance, and monitoring. Consider the technical expertise and resources available for installation, operation, and maintenance of the system. Ensure that there is access to qualified technicians who can handle any maintenance or repair needs. Environmental impact: Evaluate the environmental benefits of the gas CHP system, such as reduced greenhouse gas emissions compared to separate systems. Consider the sustainability goals and environmental requirements of the residential or commercial property..

Next Step for further feasibility analysis. Technical Feasibility: What are the technical requirements for installing a gas CHP system in my residential or commercial property? Is my existing infrastructure (gas supply, electrical connections, plumbing) compatible with a gas CHP system? How much space is required for installing the gas CHP system and associated equipment? What are the expected electrical and thermal energy outputs of the system, and how do they align with designed building energy demand?.

Next Steps for further feasibility analysis. Consideration for Absorption chillers : Cooling Demand: What are the cooling requirements of my residential or commercial property? Energy Source: What are the available energy sources for absorption chillers, such as natural gas, waste heat, or steam? Cost-Benefit Analysis: How do the operational expenses, including energy consumption and maintenance, compare to alternative cooling technologies? What cost savings can be achieved by adopting absorption chillers? Cooling Efficiency: What is the Coefficient of Performance (COP) of absorption chillers under consideration? Risk Assessment: What potential risks or challenges are associated with absorption chillers? How can equipment failure, supply disruptions, or changes in energy prices be mitigated? Are there contingency plans in place to address potential risks?.

1. Which Component is reduced by the proposal (cooling ,electricity ,hot water ) 2. Where to install? (residential part? Commercial part?) 3.Calculate how much one unit could save ?.

The end. Thank you.