The LPA study shows how much energy performance can be gained with smart, passive design strategies.
School Construction News: Making the Case for Energy Efficiency
A cost-benefit analysis examines a tiered approach to energy investments that can save schools significant money on annual operating expenses
The realities of funding school construction make it difficult for districts to weigh the short- and long-term benefits of moving their campuses to cleaner, healthier, more energy-efficient environments. Are energy-efficient strategies cost-prohibitive? The Sustainability & Applied Research team at LPA Design Studios recently worked with in-house designers and engineers, and partner Joeris General Contractors, to explore the cost-benefit analysis of energy-efficient schools.
For our case study, we chose a recently completed elementary school in Dallas, Texas — where increasingly severe weather and problems with the electrical grid have upset the status quo of cheap energy and light regulation. As school districts in every state struggle to stretch budgets amid historic political and economic uncertainty, the team looked for opportunities to save money through sustainable design.
Our goal was to understand what it would take to achieve energy independence. We want to be able to have a smart, informed conversation with our clients about up-front costs, return-on-investment and potential savings in annual operational costs.
Starting with a data-rich digital model of the school, the team studied three tiers of additional energy-efficiency investment and their associated costs and energy savings. Tier 1 studied only passive strategies—design elements like demand-control ventilation and increased roof insulation that reduce energy use with little to no added cost. Tier 2 looked at alternative HVAC systems — options for a variable refrigerant flow (VRF) system and heat pumps — to eliminate natural gas. The third-and-final tier provided multiple options for reaching net-zero energy use by adding on-site energy generation infrastructure.
The study shows just how much energy performance can be gained for free, simply with smart, passive design strategies; investing in modern, marginally more expensive HVAC tech; how quickly a net-zero energy school might pay for itself and start producing free energy.
The Results
The results illustrate the significant operational savings available from creating more-energy-efficient buildings. Starting with a passive-only approach, the estimated annual energy cost was $65,000. The optimized HVAC system cut that number by 40% at the up-front cost of $250,000.
Going a step further, adding PV on the roof would cost an additional $570,000 but would reduce the energy costs to less than $10,000 a year, an 85% savings. To eliminate the electricity bills altogether, the school would need a total cost premium investment of around $1 million. Each of these scenarios would result in a simple payback of 14 to 16 years — potentially much less if energy prices increase, as expected.
The numbers reveal a variety of ways to address energy efficiency, from reevaluating so-called ‘best practices’ to full energy independence. What’s clear is that a high-performing school building is not one-size-fits-all. The point is to give school districts what they need to make informed decisions with their budgets. The return might take 15 years, but over a life span of 50 to100 years, it adds up to a lot of free energy.
