Saint Andrews College | Energy Sustainability Case Study


THE ROAD TO LONG TERM ENERGY

SELF-SUSTAINABILITY



There are two routes to sustainability!



Energy

Efficiency:

  • Remote monitoring

  • Lighting retro fit

  • Energy management

  • Energy supply point consolidation

  • Behavioural change & education

  • Gas for cooking

  • Optimised pumping system



Alternative Energy

Generation:

  • Canteen Solar PV installation

  • Modular expansion (spare ground)

  • Solar geysers or heat pumps

  • Water heating assessment

  • 1 MW Solar PV system installation

  • Energy storage to take school offgrid





Energy

Efficiency:



1. Remote Monitoring



What can we do?

  • Tracking and visualising the energy use of all areas of the school

  • A visualisation platform allowing students to see each house’s energy efficiency


What can we achieve?

  • Historic data records and trends used to establish targets

  • Promote inter house energy efficiency competition

  • Energy education

  • Billing verification/reconciliation

  • Track energy savings

  • Informs energy management behaviour

  • Energy Cost savings


What costs will be involved?

  • Platform costs (Meters are installed)




2. Behavioural Change & Education


What can we do?


Increasing Energy Awareness through: Visualisation, Assessment & Benchmarking, Competition, Curriculum, Models and presentations, Design projects



What can we achieve?

  • Empowering and educating the school, SAC institution, students and parents on energy efficiency and savings

  • Energy awareness

  • Instilling a passion for energy efficiency

  • Ultimately savings costs through this process

  • To achieve the 2030 sustainability drive


What costs will be involved?

  • Education facilitation sessions

  • Energy assessments

  • Build material/demos


3. Lighting Retro Fit



What can we do?


Change all high energy lights to low energy lights:

  • Fluorescent tubes to LED tubes

  • Spotlights to LED lights

  • Halogen lights to LED lights


What can we achieve?

  • Awareness of energy consumption by differing materials

  • kWh savings on reduced energy use for lighting


What costs will be involved?

  • Lighting assessment

  • LED lighting capex and installation costs


4. Energy Management



What can we do?

  • Tariff optimisation

  • Demand reduction and management

  • TOU optimisation and management

  • Geyser timers

  • Base load determination and reduction

  • Automatic lighting

  • Monthly reporting & bill reconciliation

  • Behavioural changes and reductions, successes and losses

  • Identifying other opportunities to reduce energy costs


What can we achieve?

  • Rand savings on reduced energy use, billing discrepancies, beneficial tariff structure changes and behavioural change

  • Success reporting to promote further intervention and interest


What costs will be involved?

  • Monthly metering, reporting and consulting costs


5. Energy Supply Point Consolidation



What can we do?

  1. MV Bulk Supply (Admin Block) that links Upper House Garden to main building.

  2. LV Bulk Supply (Behind Graham House):

  • Link Holland House and Graham House

  • Link Pool and van der Riet

  • Determine feasibility of linking Mullins House

  • Game plan with Staff Houses


What can we achieve?

  • Reduced Admin and Service Charges

  • Working towards “bigger” picture

  • Limit no. of back up generators (Energy Security)

  • Diversity factor (Lower overall demand charge)

  • Bulk Supply lower effective energy rate (R/kWh)



What costs will be involved?

  • Consolidation engineering and administration consulting hours


6. Gas Cooking



What can we do?


Replacing electrical element cooking with gas

  • Gas can be stored unlike electricity

  • Seasonal cooking requirements creates difficulty in storing electrical energy

  • Not reducing the overall energy picture

  • Moving towards achieving energy sustainability goals


What can we achieve?

  • Move towards achieving sustainability goal of off grid operation

  • Savings on energy usage

  • Benefit of reduced storage and operation costs, especially in low loading periods


What costs will be involved?

  • Gas cooking equipment Capex

  • Gas assessment and consulting (Phased approach can be taken to reduce the cost intensity)


7. Optmised Pumping System



What can we do?

  • Load shifting operating pumps out of the more expensive electrical usage times of the day


What can we achieve?

  • Energy cost savings on cheaper electricity use


What costs will be involved?

  • Timers for each pump (Capex)



Alternative Energy

Generation:



1. Canteen Solar PV System



What can we do?

  • System Size 34kWp DC/25kW AC

  • Energy Yield – 1,628 kWh/kWp

  • 100 Solar Modules • 200 square meters


What can we achieve?

  • Refer to financial model for details returns and payback on the system

What costs will be involved?

  • R 350 000


2. Water Heating Assessment



What can we do?

  • Determine water heating process and efficiency

  • Number of geysers installed in each House and throughout the rest of the school (kitchens)

  • Determine which solution for water heating suits each application best

  • There are three options: using solar energy to create hotter water before geysers, solar geysers or using heat pumps


What can we achieve?

  • Identifying hot spots for high energy use that can be substituted with lower energy consuming solutions

  • Working towards achieving the 2030 Sustainability Goals

  • Working towards achieving energy savings and awareness throughout the school (houses, kitchens etc.)

What costs will be involved?

  • Solar water heating assessment consulting hours


3. Modular Expansion



What can we do?

  • Determine the optimum sizing of solar system according to the school’s annual load and weather profile

  • Increasing the size of the solar installations at the institution (potentially using the spare ground available) in stages


What can we achieve?

  • Further reduced energy costs, having invested Capex in stages

  • More favourable returns on everincreasing electricity prices


What costs will be involved?

  • Solar module capex and installation costs

  • Potentially maintenance and cleaning costs


4. Water Heating Installation



What can we do?

  • Using the water heating assessment install the identified solutions for each case to heat water throughout the houses and school

  • Solar geysers and heat pumps will need to be installed in the optimum spaces, providing that space allowance was granted before laying solar panels


What can we achieve?

  • Further reduced energy costs, having invested in the most favourable Capex solutions for water heating

  • A phased approach could see the school consistently improving progress towards the 2030 Sustainability Goals by reducing reliance on the grid for electricity


What costs will be involved?

  • Water heating capex and installation costs

  • Potentially maintenance and cleaning costs


5. 500 kW Solar PV System Installation



What can we do?

  • Solar PV System to reduce reliance on the national grid

  • Compliance with NERSA regulations

  • Create a micro-grid to maximise energy usage for self consumption

  • Ensure system is sized for self consumption

  • Ensure optimal locations are identified

  • Solar PV and Genset integration


What can we achieve?

  • Financially viable solution, for power generation

  • A phased approach could see the school consistently improving progress towards the 2030 Sustainability Goals by reducing reliance on the grid for electricity


What costs will be involved?

  • Solar PV costs: systems are modular with no limitations on expansion

  • Capex would be spent to ensure the financial returns are achieved


6. 1MW Solar PV System with Storage



What can we do?

  • Expanding Solar PV System to ensure independence from the national grid

  • Compliance with NERSA regulations

  • Create a micro-grid to maximise energy usage for self consumption

  • Ensure enough optimal energy mix (generation and storage) based on energy requirement


What can we achieve?

  • Financially viable solution, for both power generation and energy storage

  • A phased approach could see the school consistently improving progress towards the 2030 Sustainability Goals by reducing reliance on the grid for electricity


What costs will be involved?

  • Solar PV costs: systems are modular with no limitations on expansion

  • Energy storage will dramatically increase Capex costs


Saint Andrews College | Energy Sustainability Case Study

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