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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 Off-Grid



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 are 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 are 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 are 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 are 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 are 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 are 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 are 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 are 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 are 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 ever increasing electricity prices


> What costs are 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 are 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 are 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 are 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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