The University of East Anglia chose to procure a suite of energy conservation measures through the RE:FIT framework and after assessing all tenders thoroughly, they awarded the contract to Vital Energi. The project was underpinned with an energy performance contract which ensures that the installed measures deliver a minimum of financial and carbon savings.
“These works have saved 300kW of our daily electrical peak and this has meant we have been able to build an extra building, without having to upgrade the campus electrical supply. ”
Richard Bettle Energy and Utilities Manager
The University of East Anglia (UEA) have made a commitment to reduce their energy usage by 25% by 2020 compared to the 2013/14 baseline when their gas and electricity spend was approximately £4 million per annum. As part of this plan The University have made a £1 million investment in energy conservation measures (ECMs), which will see the implementation of a range of technologies to save energy and reduce carbon emissions.
The contract for the provision of ECMs at UEA was procured through the RE:FIT framework and we identified and delivered a range of ECMs as well as providing an energy performance contract which will guarantee financial savings and carbon reduction. Phase 1 of the project was completed in during the summer of 2018 and targeted the University’s highest energy consuming buildings, and there is an option to proceed to future phases, over a further 4 years, to implement ECMs across the rest of the University’s estate.
We analysed the University’s energy usage and performed a survey of areas which could yield savings such as improved building controls, air handling and lighting. In phase 1 this was restricted to the buildings which had the largest energy usage. These included 6 academic buildings and 22 halls of residence blocks.
During the design period we installed vCOMS (Vital Controls Optimisations and Management Service) to collect and analyse energy and operational data from the sites Building Management System (BMS). Using the information obtained alongside surveys of the existing infrastructure it was possible to develop a number of reliable and robust profit generating upgrades which would save significant energy usage and, therefore, lower carbon emissions.
The following recommendations were put forward in an Investment Grade Proposal to the University, which explains key themes such as investment costs, payback times, energy savings, carbon reductions and Measurement & Verification methodologies:
Updating Air Handling Unit & Chiller Condenser Fans to Generate Savings
We identified buildings where we could deliver significant savings through the energy efficient refurbishment of 20 packaged air handling units and replacement of 44 condenser fans on three of the chillers serving the main cooling network.
Whilst the infrastructure may have been state of the art when originally installed by the University, technology has advanced and more modern solutions can offer significant performance improvements. We were therefore able to specify modern, more efficient fans, which combined improved efficiency with increased reliability. These were connected to the existing BMS controls and balanced to achieve the correct flow rates.
It was also determined that the University’s cooling infrastructure could yield large savings by upgrading the condenser fans on packaged chillers to more modern technology and we identified 3 units which could be upgraded. These savings are generated from both the newer fan motor designs and fan blade technology which has improved significantly since the original units were installed. In addition, a controller is installed in each refrigeration circuit to improve discharge pressure control and modulate the fan speed to ensure optimum comfort levels are maintained.
Works to the chiller and air handling systems will deliver a saving in excess of £60,000 per annum and have a payback period of under 5 years.
Delivering an upgraded smart lighting network throughout the library
We have a strong track record surveying lighting systems and implementing upgrades and this extensive experience was put to use when assessing the University’s premises. We identified that the library uses a large amount of energy on lighting as it operates 24 hours per day, seven days a week and is open during both term and non-term time all year round.
Having delivered many similar projects in busy, live environments, including operating theatres and study areas, we began by looking at ways to minimise disruption. We created a designated, fenced storage compound to ensure the minimum materials and equipment were in the library at any time and we worked with library staff to identify the best times for installation. We also completed the works in “zones” to ensure only small parts of the library were affected at any one time.
Our designers identified that upgrading the inefficient lighting system, with more efficient LED alternatives could generate large carbon savings and energy cost reductions. Our approach was to maximise savings based on a full re-design of lighting within the library to maximise energy savings whilst achieving compliance with industry standards. Overall, we installed 1,834 fittings, including emergency lighting such as exit signs and gateways and these replaced 2,759 older fittings. In appropriate areas, smart fittings were installed to control light levels based on the availability of natural daylight.
Prior to the works, we carried out lighting design calculations to ensure best practice standards were met and appropriate lighting levels would be achieved following the re-design. Once the works were completed, our engineers undertook a post installation “lux level survey” which ensured that all parts of the library enjoyed optimal lighting levels.
The upgrades to the lighting system deliver annual electricity savings of 587,000 kWh, which equates to 147 tonnes of CO2 and financial savings of over £72,000 per annum and will result in a payback period of just 7.6 years.
Implementing the vCOMS System to Control and Monitor the Works
Our vCOMS (Vital Controls Optimisation & Management System) system was installed onto the Trend BMS and used to identify opportunities for improvement and, after implementation, to monitor the scheme and ensure optimum performance.
An example of the value vCOMS can bring to a scheme can be seen in one of the opportunities identified. It was noted that high internal temperatures inside and outside of occupancy were affecting comfort levels and increasing cooling demands in critical labs in the Chemistry, Biology and Sciences buildings. We introduced a heating economy control to account for internal and external temperatures and adjust the system to maintain a 20°C comfort set point and night setback, which reduced the temperature in the labs outside of occupancy hours. Despite higher ambient conditions post-delivery, the average space temperatures were reduced by almost 2°C across Chemistry North. In short, vCOMS identified an opportunity to improve comfort conditions while reducing energy consumption.
Once the energy conservation measures had been identified and installed vCOMS continues to ensure that the main energy consuming plant only operates at the times and temperatures which match the occupancy requirement. The system can do this by monitoring the performance of the building to ensure it operates within the expected parameters to maintain comfort levels for the building users. If the system performs outside of the expected parameters, improvements can be identified and implemented, which creates a cycle of continuous improvement.
One other essential feature of our vCOMS system is that it accurately measures and monitors savings. This is vital on a contract which has an energy performance contract as the client needs robust, audited data to ensure the KPIs have been achieved. The vCOMS system ensures we have the accurate data to issue reports and monitor actual performance against the expected design performance.
Overall, the energy conservation measures will save a guaranteed £184,000 per year, achieving project payback in under 6 years and then generating profit savings into the future. The biggest driver for the University, however, was to lower CO2 emissions; the first phase of works will reduce carbon emissions by 543 tonnes per year which equates to a 6.3% reduction across the buildings included in the scheme. In addition to energy savings, these works have saved 300kW of our daily electrical peak and this has meant we have been able to build an extra building, without having to upgrade the campus electrical supply.